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esp-idf/components/esp_driver_i2c/i2c_master.c

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/*
* SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <sys/param.h>
#include <sys/lock.h>
#include "sdkconfig.h"
#include "esp_types.h"
#include "esp_attr.h"
#include "esp_check.h"
#if CONFIG_I2C_ENABLE_DEBUG_LOG
// The local log level must be defined before including esp_log.h
// Set the maximum log level for this source file
#define LOG_LOCAL_LEVEL ESP_LOG_DEBUG
#endif
#include "esp_log.h"
#include "esp_intr_alloc.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "soc/i2c_periph.h"
#include "esp_private/periph_ctrl.h"
#include "esp_private/esp_clk.h"
#include "esp_rom_gpio.h"
#include "driver/i2c_master.h"
#include "i2c_private.h"
#include "driver/gpio.h"
#include "clk_ctrl_os.h"
#include "hal/i2c_types.h"
#include "hal/i2c_hal.h"
#include "hal/gpio_hal.h"
#include "esp_memory_utils.h"
#include "freertos/idf_additions.h"
static const char *TAG = "i2c.master";
#define DIM(array) (sizeof(array)/sizeof(*array))
#define I2C_ADDRESS_TRANS_WRITE(device_address) (((device_address) << 1) | 0)
#define I2C_ADDRESS_TRANS_READ(device_address) (((device_address) << 1) | 1)
#if SOC_LP_I2C_SUPPORTED
#define I2C_FIFO_LEN(port_num) (((port_num) < SOC_HP_I2C_NUM) ? SOC_I2C_FIFO_LEN : SOC_LP_I2C_FIFO_LEN)
#else
#define I2C_FIFO_LEN(port_num) (SOC_I2C_FIFO_LEN)
#endif
#define I2C_CLR_BUS_TIMEOUT_MS (50) // 50ms is sufficient for clearing the bus
// Use the platform to same master bus handle
typedef struct i2c_master_bus_platform_t i2c_master_bus_platform_t;
struct i2c_master_bus_platform_t {
i2c_master_bus_handle_t handle[SOC_I2C_NUM];
};
static i2c_master_bus_platform_t s_platform;
static esp_err_t s_i2c_master_clear_bus(i2c_bus_handle_t handle)
{
esp_err_t ret = ESP_OK;
#if !SOC_I2C_SUPPORT_HW_CLR_BUS
const int scl_half_period = 5; // use standard 100kHz data rate
int i = 0;
gpio_set_direction(handle->scl_num, GPIO_MODE_OUTPUT_OD);
gpio_set_direction(handle->sda_num, GPIO_MODE_INPUT_OUTPUT_OD);
// If a SLAVE device was in a read operation when the bus was interrupted, the SLAVE device is controlling SDA.
// The only bit during the 9 clock cycles of a READ byte the MASTER(ESP32) is guaranteed control over is during the ACK bit
// period. If the slave is sending a stream of ZERO bytes, it will only release SDA during the ACK bit period.
// So, this reset code needs to synchronous the bit stream with, Either, the ACK bit, Or a 1 bit to correctly generate
// a STOP condition.
gpio_set_level(handle->scl_num, 0);
gpio_set_level(handle->sda_num, 1);
esp_rom_delay_us(scl_half_period);
while (!gpio_get_level(handle->sda_num) && (i++ < 9)) {
gpio_set_level(handle->scl_num, 1);
esp_rom_delay_us(scl_half_period);
gpio_set_level(handle->scl_num, 0);
esp_rom_delay_us(scl_half_period);
}
gpio_set_level(handle->sda_num, 0); // setup for STOP
gpio_set_level(handle->scl_num, 1);
esp_rom_delay_us(scl_half_period);
gpio_set_level(handle->sda_num, 1); // STOP, SDA low -> high while SCL is HIGH
i2c_common_set_pins(handle);
#else
i2c_hal_context_t *hal = &handle->hal;
i2c_ll_master_clr_bus(hal->dev, I2C_LL_RESET_SLV_SCL_PULSE_NUM_DEFAULT, true);
// If the i2c master clear bus state machine got disturbed when its work, it would go into error state.
// The solution here is to use freertos tick counter to set time threshold. If its not return on time,
// return invalid state and turn off the state machine for avoiding its always wrong.
TickType_t start_tick = xTaskGetTickCount();
const TickType_t timeout_ticks = pdMS_TO_TICKS(I2C_CLR_BUS_TIMEOUT_MS);
while (i2c_ll_master_is_bus_clear_done(hal->dev)) {
if ((xTaskGetTickCount() - start_tick) > timeout_ticks) {
ESP_LOGE(TAG, "clear bus failed.");
i2c_ll_master_clr_bus(hal->dev, 0, false);
ret = ESP_ERR_INVALID_STATE;
break;
}
}
i2c_ll_update(hal->dev);
#endif
return ret;
}
/**
* @brief Reset I2C hardware fsm.
* 1. Store filter and timing stuff(they are I2C hardware configure stuff)
* so, the configuration is same after reset.
*
* @param[in] i2c_master I2C master handle
*/
static esp_err_t s_i2c_hw_fsm_reset(i2c_master_bus_handle_t i2c_master)
{
esp_err_t ret = ESP_OK;
i2c_hal_context_t *hal = &i2c_master->base->hal;
#if !SOC_I2C_SUPPORT_HW_FSM_RST
i2c_hal_timing_config_t timing_config;
uint8_t filter_cfg;
i2c_hal_get_timing_config(hal, &timing_config);
i2c_ll_master_get_filter(hal->dev, &filter_cfg);
//to reset the I2C hw module, we need re-enable the hw
ret = s_i2c_master_clear_bus(i2c_master->base);
I2C_RCC_ATOMIC() {
i2c_ll_reset_register(i2c_master->base->port_num);
}
i2c_hal_master_init(hal);
i2c_ll_disable_intr_mask(hal->dev, I2C_LL_INTR_MASK);
i2c_ll_clear_intr_mask(hal->dev, I2C_LL_INTR_MASK);
i2c_hal_set_timing_config(hal, &timing_config);
i2c_ll_master_set_filter(hal->dev, filter_cfg);
#else
i2c_ll_master_fsm_rst(hal->dev);
ret = s_i2c_master_clear_bus(i2c_master->base);
#endif
return ret;
}
static void s_i2c_err_log_print(i2c_master_event_t event, bool bypass_nack_log)
{
if (event == I2C_EVENT_TIMEOUT) {
ESP_LOGE(TAG, "I2C transaction timeout detected");
}
if (bypass_nack_log != true) {
if (event == I2C_EVENT_NACK) {
ESP_LOGE(TAG, "I2C transaction unexpected nack detected");
}
}
}
//////////////////////////////////////I2C operation functions////////////////////////////////////////////
/**
* @brief This function is used to send I2C write command, which is divided in two parts.
* -1. If write buffer is smaller than hardware fifo, it can be sent out in one single time,
* so the hardware command(step) is simply like start(1)->write(2)->end(3)
* -2. If write buffer is larger than hardware fifo, it cannot be sent out in one time, so it needs
* to be separated in to different transactions by interrupt. In this time, the hardware command(step)
* simply looks like start(1)->write_part(2)--interrupt--...--write(1)->end(2).
*
* @param[in] i2c_master I2C master handle
* @param[in] i2c_operation Pointer to I2C trans operation structure.
* @param[in] fifo_fill will be populated with the number of bytes written to the hardware FIFO by this function
* @param[in] address_fill I2C device address with read or write information.
*/
static bool s_i2c_write_command(i2c_master_bus_handle_t i2c_master, i2c_operation_t *i2c_operation, uint8_t *fifo_fill, uint8_t *address_fill, BaseType_t *do_yield)
{
i2c_master->async_break = false;
const size_t remaining_bytes = i2c_operation->total_bytes - i2c_operation->bytes_used;
const i2c_ll_hw_cmd_t hw_end_cmd = {
.op_code = I2C_LL_CMD_END
};
uint8_t *write_pr = NULL;
i2c_hal_context_t *hal = &i2c_master->base->hal;
i2c_bus_handle_t handle = i2c_master->base;
i2c_ll_hw_cmd_t hw_cmd = i2c_operation->hw_cmd;
uint8_t data_fill = 0;
// data_fill refers to the length to fill the data
data_fill = MIN(remaining_bytes, I2C_FIFO_LEN(i2c_master->base->port_num) - *address_fill);
write_pr = i2c_operation->data + i2c_operation->bytes_used;
i2c_operation->bytes_used += data_fill;
hw_cmd.byte_num = data_fill + *address_fill;
*address_fill = 0;
atomic_store(&i2c_master->status, I2C_STATUS_WRITE);
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_ll_write_txfifo(hal->dev, write_pr, data_fill);
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
portEXIT_CRITICAL_SAFE(&handle->spinlock);
i2c_master->w_r_size = data_fill;
#if SOC_I2C_STOP_INDEPENDENT
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
i2c_master->cmd_idx = 0;
if (i2c_master->i2c_trans.ops[i2c_master->trans_idx].total_bytes == i2c_master->i2c_trans.ops[i2c_master->trans_idx].bytes_used) {
i2c_master->i2c_trans.cmd_count--;
i2c_master->trans_idx++;
}
portENTER_CRITICAL_SAFE(&handle->spinlock);
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
portEXIT_CRITICAL_SAFE(&handle->spinlock);
#else
// If data cannot be sent in one time, send data out. Otherwise, continue configuring command.
if ((remaining_bytes - data_fill) != 0) {
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
portEXIT_CRITICAL_SAFE(&handle->spinlock);
i2c_master->cmd_idx = 0;
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
} else {
// Handle consecutive i2c write operations
i2c_operation_t next_transaction = i2c_master->i2c_trans.ops[i2c_master->trans_idx + 1];
if (next_transaction.hw_cmd.op_code == I2C_LL_CMD_WRITE) {
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
portEXIT_CRITICAL_SAFE(&handle->spinlock);
i2c_master->cmd_idx = 0;
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
} else {
i2c_master->cmd_idx++;
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
if (i2c_master->async_trans == false) {
if (xPortInIsrContext()) {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, do_yield);
} else {
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
}
}
#endif
*fifo_fill = data_fill;
return i2c_master->async_break;
}
/**
* @brief This function is used to send I2C read command, which is divided in three parts.
* -1. If read buffer is smaller than hardware fifo, it can be sent out in one single time,
* so the hardware command(step) is simply like start(1)->read_ack(2)->read_nack(3)->end(4)
* -2. If read buffer is larger than hardware fifo, it cannot be sent out in one time, so it needs
* to be separated in to different transactions by interrupt. In this time, the hardware command(step)
* simply looks like start(1)->read_part(2)--interrupt--...--read(1)->end(2).
* -3. If only one byte is waiting to be read. only send nack command. like start(1)->read_nack(2)->end(3)
*
* @param[in] i2c_master I2C master handle
* @param[in] i2c_operation Pointer to I2C trans operation structure.
* @param[out] fifo_fill Pointer to read buffer length
*/
static bool s_i2c_read_command(i2c_master_bus_handle_t i2c_master, i2c_operation_t *i2c_operation, uint8_t *fifo_fill, BaseType_t *do_yield)
{
i2c_master->async_break = false;
const size_t remaining_bytes = i2c_operation->total_bytes - i2c_operation->bytes_used;
const i2c_ll_hw_cmd_t hw_end_cmd = {
.op_code = I2C_LL_CMD_END
};
i2c_hal_context_t *hal = &i2c_master->base->hal;
i2c_bus_handle_t handle = i2c_master->base;
i2c_ll_hw_cmd_t hw_cmd = i2c_operation->hw_cmd;
*fifo_fill = MIN(remaining_bytes, I2C_FIFO_LEN(i2c_master->base->port_num) - i2c_master->read_len_static);
i2c_master->rx_cnt = *fifo_fill;
hw_cmd.byte_num = *fifo_fill;
i2c_master->contains_read = true;
#if !SOC_I2C_STOP_INDEPENDENT
if (remaining_bytes < I2C_FIFO_LEN(i2c_master->base->port_num) - 1) {
if (i2c_operation->hw_cmd.ack_val == ACK_VAL) {
if (remaining_bytes != 0) {
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_master->read_len_static = i2c_master->rx_cnt;
i2c_master->cmd_idx++;
}
i2c_master->read_buf_pos = i2c_master->trans_idx;
} else {
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
}
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
if (i2c_master->async_trans == false) {
if (xPortInIsrContext()) {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, do_yield);
} else {
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
} else {
atomic_store(&i2c_master->status, I2C_STATUS_READ);
portENTER_CRITICAL_SAFE(&handle->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
portEXIT_CRITICAL_SAFE(&handle->spinlock);
}
#else
portENTER_CRITICAL_SAFE(&handle->spinlock);
// If the read command work with ack_val, but no bytes to read, we skip
// this command, and run next command directly.
if (hw_cmd.ack_val == ACK_VAL) {
if (i2c_operation->total_bytes == 0) {
i2c_master->trans_idx++;
hw_cmd = i2c_master->i2c_trans.ops[i2c_master->trans_idx].hw_cmd;
i2c_master->i2c_trans.cmd_count--;
}
}
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_ll_master_write_cmd_reg(hal->dev, hw_end_cmd, i2c_master->cmd_idx + 1);
portEXIT_CRITICAL_SAFE(&handle->spinlock);
i2c_master->status = I2C_STATUS_READ;
portENTER_CRITICAL_SAFE(&handle->spinlock);
if (i2c_master->async_trans == false) {
i2c_hal_master_trans_start(hal);
} else {
i2c_master->async_break = true;
}
portEXIT_CRITICAL_SAFE(&handle->spinlock);
#endif
return i2c_master->async_break;
}
/**
* @brief This function is used to send I2C start or stop command, which is divided in two parts.
* If start command is accepted, a write address command must be followed. So prepared one address
* data here. Send with write or read command.
*
* @param[in] i2c_master I2C master handle
* @param[in] i2c_operation Pointer to I2C trans operation structure.
* @param[in] address_fill I2C device address with read or write information.
*/
static void s_i2c_start_end_command(i2c_master_bus_handle_t i2c_master, i2c_operation_t *i2c_operation, uint8_t *address_fill, BaseType_t *do_yield)
{
i2c_hal_context_t *hal = &i2c_master->base->hal;
i2c_ll_hw_cmd_t hw_cmd = i2c_operation->hw_cmd;
#if SOC_I2C_SUPPORT_10BIT_ADDR
uint8_t cmd_address = (i2c_master->addr_10bits_bus == I2C_ADDR_BIT_LEN_7) ? i2c_master->i2c_trans.device_address : ((i2c_master->i2c_trans.device_address >> 8) | 0x78);
uint8_t addr_byte = (i2c_master->addr_10bits_bus == I2C_ADDR_BIT_LEN_7) ? 1 : 2;
#else
uint8_t cmd_address = i2c_master->i2c_trans.device_address;
uint8_t addr_byte = 1;
#endif
uint8_t addr_write[addr_byte];
uint8_t addr_read[addr_byte];
addr_write[0] = I2C_ADDRESS_TRANS_WRITE(cmd_address);
addr_read[0] = I2C_ADDRESS_TRANS_READ(cmd_address);
#if SOC_I2C_SUPPORT_10BIT_ADDR
if (i2c_master->addr_10bits_bus == I2C_ADDR_BIT_LEN_10) {
addr_write[1] = i2c_master->i2c_trans.device_address & 0xff;
addr_read[1] = i2c_master->i2c_trans.device_address & 0xff;
}
#endif
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
if (i2c_operation->hw_cmd.op_code == I2C_LL_CMD_RESTART) {
i2c_operation_t next_transaction = i2c_master->i2c_trans.ops[i2c_master->trans_idx + 1];
if (next_transaction.hw_cmd.op_code == I2C_LL_CMD_READ) {
#if SOC_I2C_SUPPORT_10BIT_ADDR
if (i2c_master->addr_10bits_bus == I2C_ADDR_BIT_LEN_10) {
i2c_ll_hw_cmd_t hw_write_cmd = {
.ack_en = false,
.op_code = I2C_LL_CMD_WRITE,
.byte_num = 2,
};
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_write_txfifo(hal->dev, addr_write, sizeof(addr_write));
i2c_ll_master_write_cmd_reg(hal->dev, hw_write_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
const i2c_ll_hw_cmd_t hw_start_cmd = {
.op_code = I2C_LL_CMD_RESTART,
};
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_master_write_cmd_reg(hal->dev, hw_start_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
}
#endif
i2c_ll_hw_cmd_t hw_write_cmd = {
.ack_en = i2c_master->ack_check_disable ? false : true,
.op_code = I2C_LL_CMD_WRITE,
.byte_num = 1,
};
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_write_txfifo(hal->dev, addr_read, sizeof(addr_read));
i2c_ll_master_write_cmd_reg(hal->dev, hw_write_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
} else if (next_transaction.hw_cmd.op_code == I2C_LL_CMD_STOP) {
i2c_ll_hw_cmd_t hw_write_cmd = {
.ack_en = true,
.op_code = I2C_LL_CMD_WRITE,
.byte_num = 1,
};
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_write_txfifo(hal->dev, addr_write, sizeof(addr_write));
i2c_ll_master_write_cmd_reg(hal->dev, hw_write_cmd, i2c_master->cmd_idx);
i2c_master->cmd_idx++;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
} else {
/* The next transaction is a WRITE, we can merge the device address byte
* with the next write command. No need to write the `cmd_reg` as the next
* command will do it for us, we only need to add the device address byte
* in the TX FIFO. */
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_ll_write_txfifo(hal->dev, addr_write, sizeof(addr_write));
*address_fill += sizeof(addr_write);
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
}
if (i2c_master->async_trans == false) {
if (xPortInIsrContext()) {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, do_yield);
} else {
xSemaphoreGive(i2c_master->cmd_semphr);
}
}
} else {
atomic_store(&i2c_master->status, I2C_STATUS_STOP);
}
portENTER_CRITICAL_SAFE(&i2c_master->base->spinlock);
i2c_master->trans_idx++;
i2c_master->i2c_trans.cmd_count--;
portEXIT_CRITICAL_SAFE(&i2c_master->base->spinlock);
}
static void s_i2c_send_commands(i2c_master_bus_handle_t i2c_master, TickType_t ticks_to_wait)
{
i2c_hal_context_t *hal = &i2c_master->base->hal;
uint8_t fifo_fill = 0;
uint8_t address_fill = 0;
// Initialise event queue.
xQueueReset(i2c_master->event_queue);
i2c_master->event = I2C_EVENT_ALIVE;
while (i2c_master->i2c_trans.cmd_count) {
if (xSemaphoreTake(i2c_master->cmd_semphr, ticks_to_wait) != pdTRUE) {
// Software timeout, clear the command link and finish this transaction.
i2c_master->cmd_idx = 0;
i2c_master->trans_idx = 0;
atomic_store(&i2c_master->status, I2C_STATUS_TIMEOUT);
ESP_LOGE(TAG, "I2C software timeout");
xSemaphoreGive(i2c_master->cmd_semphr);
return;
}
if (i2c_master->status == I2C_STATUS_TIMEOUT) {
s_i2c_hw_fsm_reset(i2c_master);
i2c_master->cmd_idx = 0;
i2c_master->trans_idx = 0;
ESP_LOGE(TAG, "I2C hardware timeout detected");
xSemaphoreGive(i2c_master->cmd_semphr);
return;
}
if (i2c_master->status == I2C_STATUS_ACK_ERROR) {
ESP_LOGE(TAG, "I2C hardware NACK detected");
const i2c_ll_hw_cmd_t hw_stop_cmd = {
.op_code = I2C_LL_CMD_STOP,
};
i2c_ll_master_write_cmd_reg(hal->dev, hw_stop_cmd, 0);
i2c_hal_master_trans_start(hal);
// The master trans start would start a transaction.
// Queue wait for the event instead of return directly.
break;
}
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->trans_idx];
if (i2c_operation->hw_cmd.op_code == I2C_LL_CMD_WRITE) {
s_i2c_write_command(i2c_master, i2c_operation, &fifo_fill, &address_fill, NULL);
} else if (i2c_operation->hw_cmd.op_code == I2C_LL_CMD_READ) {
s_i2c_read_command(i2c_master, i2c_operation, &fifo_fill, NULL);
} else {
s_i2c_start_end_command(i2c_master, i2c_operation, &address_fill, NULL);
}
}
i2c_hal_master_trans_start(hal);
// For blocking implementation, we must wait event interrupt to update the status.
// Otherwise, update status to timeout.
i2c_master_event_t event;
if (xQueueReceive(i2c_master->event_queue, &event, ticks_to_wait) == pdTRUE) {
if (event == I2C_EVENT_DONE) {
atomic_store(&i2c_master->status, I2C_STATUS_DONE);
} else if (event == I2C_EVENT_NACK) {
// For i2c nack detected, the i2c transaction not finish.
// start->address->nack->stop
// So wait the whole transaction finishes, then quit the function.
while (i2c_ll_is_bus_busy(hal->dev)) {
__asm__ __volatile__("nop");
}
}
s_i2c_err_log_print(event, i2c_master->bypass_nack_log);
} else {
i2c_master->cmd_idx = 0;
i2c_master->trans_idx = 0;
atomic_store(&i2c_master->status, I2C_STATUS_TIMEOUT);
}
xSemaphoreGive(i2c_master->cmd_semphr);
}
static void s_i2c_send_command_async(i2c_master_bus_handle_t i2c_master, BaseType_t *do_yield)
{
i2c_hal_context_t *hal = &i2c_master->base->hal;
uint8_t address_fill = 0;
bool needs_start = false;
if (i2c_master->i2c_trans.cmd_count == 0) {
// No extra commands.
i2c_master->trans_finish = true;
i2c_master->in_progress = false;
if (i2c_master->queue_trans) {
xSemaphoreTakeFromISR(i2c_master->bus_lock_mux, do_yield);
i2c_master->new_queue = true;
i2c_master->ops_cur_size--;
xSemaphoreGiveFromISR(i2c_master->bus_lock_mux, do_yield);
xQueueSendFromISR(i2c_master->trans_queues[I2C_TRANS_QUEUE_COMPLETE], &i2c_master->i2c_trans, do_yield);
}
i2c_master->sent_all = true;
return;
}
// Stop the transaction when invalid event is detected
if (i2c_master->event == I2C_EVENT_NACK || i2c_master->event == I2C_EVENT_TIMEOUT) {
i2c_master->sent_all = true;
i2c_master->trans_finish = true;
i2c_master->in_progress = false;
if (i2c_master->queue_trans) {
i2c_master->ops_cur_size--;
xQueueSendFromISR(i2c_master->trans_queues[I2C_TRANS_QUEUE_COMPLETE], &i2c_master->i2c_trans, do_yield);
}
i2c_master->i2c_trans.cmd_count = 0;
i2c_master->event = I2C_EVENT_ALIVE;
return;
}
while (i2c_ll_is_bus_busy(hal->dev)) {}
while (i2c_master->i2c_trans.cmd_count && !needs_start) {
i2c_master->in_progress = true;
i2c_master->sent_all = false;
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->trans_idx];
uint8_t fifo_fill = 0;
if (i2c_operation->hw_cmd.op_code == I2C_LL_CMD_WRITE) {
needs_start = s_i2c_write_command(i2c_master, i2c_operation, &fifo_fill, &address_fill, do_yield);
} else if (i2c_operation->hw_cmd.op_code == I2C_LL_CMD_READ) {
needs_start = s_i2c_read_command(i2c_master, i2c_operation, &fifo_fill, do_yield);
} else {
s_i2c_start_end_command(i2c_master, i2c_operation, &address_fill, do_yield);
}
}
i2c_hal_master_trans_start(hal);
}
static esp_err_t s_i2c_transaction_start(i2c_master_dev_handle_t i2c_dev, int xfer_timeout_ms)
{
i2c_master_bus_handle_t i2c_master = i2c_dev->master_bus;
i2c_hal_context_t *hal = &i2c_master->base->hal;
TickType_t ticks_to_wait = (xfer_timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(xfer_timeout_ms);
// Sometimes when the FSM get stuck, the ACK_ERR interrupt will occur endlessly until we reset the FSM and clear bus.
esp_err_t ret = ESP_OK;
if (i2c_master->status == I2C_STATUS_TIMEOUT || i2c_ll_is_bus_busy(hal->dev)) {
ESP_RETURN_ON_ERROR(s_i2c_hw_fsm_reset(i2c_master), TAG, "reset hardware failed");
}
if (i2c_master->base->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_acquire(i2c_master->base->pm_lock), TAG, "acquire pm_lock failed");
}
portENTER_CRITICAL(&i2c_master->base->spinlock);
atomic_init(&i2c_master->trans_idx, 0);
atomic_store(&i2c_master->status, I2C_STATUS_IDLE);
i2c_master->cmd_idx = 0;
i2c_master->rx_cnt = 0;
i2c_master->read_len_static = 0;
I2C_CLOCK_SRC_ATOMIC() {
i2c_hal_set_bus_timing(hal, i2c_dev->scl_speed_hz, i2c_master->base->clk_src, i2c_master->base->clk_src_freq_hz);
}
// Set the timeout value
i2c_hal_master_set_scl_timeout_val(hal, i2c_dev->scl_wait_us, i2c_master->base->clk_src_freq_hz);
i2c_ll_master_set_fractional_divider(hal->dev, 0, 0);
i2c_ll_update(hal->dev);
i2c_ll_txfifo_rst(hal->dev);
i2c_ll_rxfifo_rst(hal->dev);
i2c_ll_enable_intr_mask(hal->dev, I2C_LL_MASTER_EVENT_INTR);
portEXIT_CRITICAL(&i2c_master->base->spinlock);
if (i2c_master->async_trans == true) {
s_i2c_send_command_async(i2c_master, NULL);
} else {
s_i2c_send_commands(i2c_master, ticks_to_wait);
// Wait event bits
if (i2c_master->status != I2C_STATUS_DONE) {
ret = ESP_ERR_INVALID_STATE;
}
// Interrupt can be disabled when on transaction finishes.
i2c_ll_disable_intr_mask(hal->dev, I2C_LL_MASTER_EVENT_INTR);
}
if (i2c_master->base->pm_lock) {
ESP_RETURN_ON_ERROR(esp_pm_lock_release(i2c_master->base->pm_lock), TAG, "release pm_lock failed");
}
return ret;
}
///////////////////////////////I2C DRIVERS//////////////////////////////////////////////////////////////
IRAM_ATTR static void i2c_isr_receive_handler(i2c_master_bus_t *i2c_master)
{
i2c_hal_context_t *hal = &i2c_master->base->hal;
if (i2c_master->status == I2C_STATUS_READ) {
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->trans_idx];
portENTER_CRITICAL_ISR(&i2c_master->base->spinlock);
i2c_ll_read_rxfifo(hal->dev, i2c_operation->data + i2c_operation->bytes_used, i2c_master->rx_cnt);
/* rx_cnt bytes have just been read, increment the number of bytes used from the buffer */
i2c_master->w_r_size = i2c_master->rx_cnt;
i2c_operation->bytes_used += i2c_master->rx_cnt;
i2c_master->cmd_idx = 0;
/* Test if there are still some remaining bytes to send. */
if (i2c_operation->bytes_used == i2c_operation->total_bytes) {
i2c_master->i2c_trans.cmd_count--;
i2c_master->read_buf_pos = i2c_master->trans_idx;
i2c_master->trans_idx++;
i2c_operation->bytes_used = 0;
}
portEXIT_CRITICAL_ISR(&i2c_master->base->spinlock);
}
#if !SOC_I2C_STOP_INDEPENDENT
else {
i2c_operation_t *i2c_operation = &i2c_master->i2c_trans.ops[i2c_master->read_buf_pos];
portENTER_CRITICAL_ISR(&i2c_master->base->spinlock);
i2c_ll_read_rxfifo(hal->dev, i2c_operation->data + i2c_operation->bytes_used, i2c_master->read_len_static);
i2c_ll_read_rxfifo(hal->dev, i2c_master->i2c_trans.ops[i2c_master->read_buf_pos + 1].data, 1);
i2c_master->w_r_size = i2c_master->read_len_static + 1;
i2c_master->contains_read = false;
portEXIT_CRITICAL_ISR(&i2c_master->base->spinlock);
}
#endif
}
static void IRAM_ATTR i2c_master_isr_handler_default(void *arg)
{
i2c_master_bus_handle_t i2c_master = (i2c_master_bus_t*) arg;
i2c_hal_context_t *hal = &i2c_master->base->hal;
portBASE_TYPE HPTaskAwoken = pdFALSE;
uint32_t int_mask;
BaseType_t ret = pdTRUE;
i2c_master->trans_done = false;
i2c_ll_get_intr_mask(hal->dev, &int_mask);
i2c_ll_clear_intr_mask(hal->dev, int_mask);
if (int_mask == 0) {
return;
}
if (int_mask & I2C_LL_INTR_NACK) {
atomic_store(&i2c_master->status, I2C_STATUS_ACK_ERROR);
i2c_master->event = I2C_EVENT_NACK;
} else if (int_mask & I2C_LL_INTR_TIMEOUT || int_mask & I2C_LL_INTR_ARBITRATION) {
atomic_store(&i2c_master->status, I2C_STATUS_TIMEOUT);
i2c_master->event = I2C_EVENT_TIMEOUT;
} else if (int_mask & I2C_LL_INTR_MST_COMPLETE) {
i2c_master->trans_done = true;
i2c_master->event = I2C_EVENT_DONE;
}
if (i2c_master->event != I2C_EVENT_ALIVE) {
xQueueSendFromISR(i2c_master->event_queue, (void *)&i2c_master->event, &HPTaskAwoken);
}
if (i2c_master->contains_read == true) {
if (int_mask & I2C_LL_INTR_MST_COMPLETE || int_mask & I2C_LL_INTR_END_DETECT) {
i2c_isr_receive_handler(i2c_master);
}
}
if (i2c_master->async_trans) {
i2c_master_dev_handle_t i2c_dev = NULL;
i2c_master_device_list_t *device_item;
xSemaphoreTakeFromISR(i2c_master->bus_lock_mux, &HPTaskAwoken);
SLIST_FOREACH(device_item, &i2c_master->device_list, next) {
if (device_item->device->device_address == i2c_master->i2c_trans.device_address) {
i2c_dev = device_item->device;
break;
}
}
xSemaphoreGiveFromISR(i2c_master->bus_lock_mux, &HPTaskAwoken);
if (i2c_dev == NULL) {
return;
}
i2c_master_event_data_t evt = {
.event = i2c_master->event,
};
s_i2c_send_command_async(i2c_master, &HPTaskAwoken);
if (i2c_master->trans_done) {
if (i2c_dev->on_trans_done) {
i2c_dev->on_trans_done(i2c_dev, &evt, i2c_dev->user_ctx);
}
if (i2c_master->new_queue && i2c_master->num_trans_inqueue > 0 && i2c_master->in_progress == false) {
i2c_transaction_t t = {};
i2c_master->num_trans_inqueue--;
i2c_master->new_queue = false;
t.cmd_count = 0;
t.device_address = 0;
t.ops = NULL;
ret = xQueueReceiveFromISR(i2c_master->trans_queues[I2C_TRANS_QUEUE_PROGRESS], &t, &HPTaskAwoken);
if (ret == pdTRUE) {
i2c_master->queue_trans = true;
atomic_init(&i2c_master->trans_idx, 0);
atomic_store(&i2c_master->status, I2C_STATUS_IDLE);
i2c_master->cmd_idx = 0;
i2c_master->rx_cnt = 0;
i2c_master->read_len_static = 0;
i2c_ll_txfifo_rst(hal->dev);
i2c_ll_rxfifo_rst(hal->dev);
i2c_master->i2c_trans = t;
memcpy(i2c_master->i2c_ops, t.ops, t.cmd_count * sizeof(i2c_operation_t));
s_i2c_send_command_async(i2c_master, &HPTaskAwoken);
}
}
}
} else {
xSemaphoreGiveFromISR(i2c_master->cmd_semphr, &HPTaskAwoken);
}
if (HPTaskAwoken == pdTRUE) {
portYIELD_FROM_ISR();
}
}
static esp_err_t i2c_param_master_config(i2c_bus_handle_t handle, const i2c_master_bus_config_t *i2c_conf)
{
i2c_hal_context_t *hal = &handle->hal;
ESP_RETURN_ON_ERROR(i2c_common_set_pins(handle), TAG, "i2c master set pin failed");
soc_module_clk_t clk_source = i2c_conf->clk_source;
ESP_RETURN_ON_ERROR(i2c_select_periph_clock(handle, clk_source), TAG, "i2c select clock failed");
handle->clk_src = i2c_conf->clk_source;
portENTER_CRITICAL(&handle->spinlock);
i2c_hal_master_init(hal);
i2c_ll_update(hal->dev);
portEXIT_CRITICAL(&handle->spinlock);
return ESP_OK;
}
static esp_err_t i2c_master_bus_destroy(i2c_master_bus_handle_t bus_handle)
{
ESP_RETURN_ON_FALSE(bus_handle, ESP_ERR_INVALID_ARG, TAG, "no memory for i2c master bus");
i2c_master_bus_handle_t i2c_master = bus_handle;
if (i2c_release_bus_handle(i2c_master->base) == ESP_OK) {
if (i2c_master) {
if (i2c_master->bus_lock_mux) {
vSemaphoreDeleteWithCaps(i2c_master->bus_lock_mux);
i2c_master->bus_lock_mux = NULL;
}
if (i2c_master->cmd_semphr) {
vSemaphoreDeleteWithCaps(i2c_master->cmd_semphr);
i2c_master->cmd_semphr = NULL;
}
if (i2c_master->event_queue) {
vQueueDeleteWithCaps(i2c_master->event_queue);
}
if (i2c_master->queues_storage) {
free(i2c_master->queues_storage);
}
free(i2c_master->i2c_async_ops);
for (int i = 0; i < I2C_TRANS_QUEUE_MAX; i++) {
if (i2c_master->trans_queues[i]) {
vQueueDelete(i2c_master->trans_queues[i]);
}
}
bus_handle = NULL;
}
free(i2c_master);
} else {
free(i2c_master);
}
return ESP_OK;
}
static esp_err_t s_i2c_asynchronous_transaction(i2c_master_dev_handle_t i2c_dev, i2c_operation_t *i2c_ops, size_t ops_dim, int timeout_ms)
{
i2c_master_bus_t *i2c_master = i2c_dev->master_bus;
if (i2c_master->sent_all == true && i2c_master->num_trans_inqueue == 0) {
memcpy(i2c_master->i2c_ops, i2c_ops, sizeof(i2c_operation_t) * ops_dim);
i2c_master->addr_10bits_bus = i2c_dev->addr_10bits;
i2c_master->i2c_trans = (i2c_transaction_t) {
.device_address = i2c_dev->device_address,
.ops = i2c_master->i2c_ops,
.cmd_count = ops_dim,
};
i2c_master->sent_all = false;
i2c_master->trans_finish = false;
i2c_master->queue_trans = false;
ESP_RETURN_ON_ERROR(s_i2c_transaction_start(i2c_dev, timeout_ms), TAG, "I2C transaction failed");
} else {
xSemaphoreTake(i2c_master->bus_lock_mux, portMAX_DELAY);
// Check whether operation pool has extra space.
bool ops_pool = (i2c_master->ops_cur_size != i2c_master->queue_size);
i2c_operation_t *ops_current;
if (ops_pool) {
i2c_master->ops_cur_size++;
memcpy(&i2c_master->i2c_async_ops[i2c_master->ops_prepare_idx], i2c_ops, sizeof(i2c_operation_t) * ops_dim);
// Clear unused memory
uint8_t unused_dim = I2C_STATIC_OPERATION_ARRAY_MAX - ops_dim;
if (unused_dim != 0) {
memset(&i2c_master->i2c_async_ops[i2c_master->ops_prepare_idx] + sizeof(i2c_operation_t) * ops_dim, 0, sizeof(i2c_operation_t) * unused_dim);
}
// Record current operation and feed to transaction queue.
ops_current = &i2c_master->i2c_async_ops[i2c_master->ops_prepare_idx][0];
i2c_master->ops_prepare_idx = (i2c_master->ops_prepare_idx + 1) % i2c_master->queue_size;
}
xSemaphoreGive(i2c_master->bus_lock_mux);
ESP_RETURN_ON_FALSE(ops_pool == true, ESP_ERR_INVALID_STATE, TAG, "ops list is full, please increase your trans_queue_depth");
i2c_transaction_t i2c_queue_pre;
if (i2c_master->num_trans_inflight < i2c_master->queue_size) {
ESP_RETURN_ON_FALSE(xQueueReceive(i2c_master->trans_queues[I2C_TRANS_QUEUE_READY], &i2c_queue_pre, portMAX_DELAY) == pdTRUE, ESP_FAIL, TAG, "no transaction in the ready queue");
} else {
ESP_RETURN_ON_FALSE(xQueueReceive(i2c_master->trans_queues[I2C_TRANS_QUEUE_COMPLETE], &i2c_queue_pre, portMAX_DELAY) == pdTRUE, ESP_FAIL, TAG, "recycle transaction from done queue failed");
i2c_master->num_trans_inflight--;
}
i2c_queue_pre = (i2c_transaction_t) {
.device_address = i2c_dev->device_address,
.ops = ops_current,
.cmd_count = ops_dim,
};
if (xQueueSend(i2c_master->trans_queues[I2C_TRANS_QUEUE_PROGRESS], &i2c_queue_pre, portMAX_DELAY) == pdTRUE) {
i2c_master->num_trans_inflight++;
i2c_master->num_trans_inqueue++;
if (i2c_master->sent_all == true) {
// Oh no, you cannot get the queue from ISR, so you get queue here.
ESP_RETURN_ON_FALSE(xQueueReceive(i2c_master->trans_queues[I2C_TRANS_QUEUE_PROGRESS], &i2c_queue_pre, portMAX_DELAY) == pdTRUE, ESP_FAIL, TAG, "get trans from progress queue failed");
i2c_master->ops_cur_size--;
i2c_master->num_trans_inflight--;
i2c_master->num_trans_inqueue--;
i2c_master->sent_all = false;
i2c_master->trans_finish = false;
i2c_master->queue_trans = false;
ESP_RETURN_ON_ERROR(s_i2c_transaction_start(i2c_dev, timeout_ms), TAG, "I2C transaction failed");
}
} else {
ESP_RETURN_ON_FALSE(xQueueSend(i2c_master->trans_queues[I2C_TRANS_QUEUE_READY], &i2c_queue_pre, 0) == pdTRUE, ESP_ERR_INVALID_STATE, TAG, "ready queue full");
}
}
return ESP_OK;
}
static esp_err_t s_i2c_synchronous_transaction(i2c_master_dev_handle_t i2c_dev, i2c_operation_t *i2c_ops, size_t ops_dim, int timeout_ms)
{
esp_err_t ret = ESP_OK;
i2c_dev->master_bus->trans_done = false;
TickType_t ticks_to_wait = (timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
if (xSemaphoreTake(i2c_dev->master_bus->bus_lock_mux, ticks_to_wait) != pdTRUE) {
return ESP_ERR_TIMEOUT;
}
memcpy(i2c_dev->master_bus->i2c_ops, i2c_ops, sizeof(i2c_operation_t) * ops_dim);
i2c_dev->master_bus->addr_10bits_bus = i2c_dev->addr_10bits;
i2c_dev->master_bus->i2c_trans = (i2c_transaction_t) {
.device_address = i2c_dev->device_address,
.ops = i2c_dev->master_bus->i2c_ops,
.cmd_count = ops_dim,
};
i2c_dev->master_bus->sent_all = false;
i2c_dev->master_bus->trans_finish = false;
i2c_dev->master_bus->queue_trans = false;
i2c_dev->master_bus->ack_check_disable = i2c_dev->ack_check_disable;
ESP_GOTO_ON_ERROR(s_i2c_transaction_start(i2c_dev, timeout_ms), err, TAG, "I2C transaction failed");
xSemaphoreGive(i2c_dev->master_bus->bus_lock_mux);
return ret;
err:
// When error occurs, reset hardware fsm in case not influence following transactions.
s_i2c_hw_fsm_reset(i2c_dev->master_bus);
xSemaphoreGive(i2c_dev->master_bus->bus_lock_mux);
return ret;
}
esp_err_t i2c_new_master_bus(const i2c_master_bus_config_t *bus_config, i2c_master_bus_handle_t *ret_bus_handle)
{
#if CONFIG_I2C_ENABLE_DEBUG_LOG
esp_log_level_set(TAG, ESP_LOG_DEBUG);
#endif
esp_err_t ret = ESP_OK;
i2c_master_bus_t *i2c_master = NULL;
i2c_port_num_t i2c_port_num = bus_config->i2c_port;
ESP_RETURN_ON_FALSE(bus_config, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE((bus_config->i2c_port < SOC_I2C_NUM || bus_config->i2c_port == -1), ESP_ERR_INVALID_ARG, TAG, "invalid i2c port number");
ESP_RETURN_ON_FALSE(GPIO_IS_VALID_GPIO(bus_config->sda_io_num) && GPIO_IS_VALID_GPIO(bus_config->scl_io_num), ESP_ERR_INVALID_ARG, TAG, "invalid SDA/SCL pin number");
i2c_master = heap_caps_calloc(1, sizeof(i2c_master_bus_t) + 20 * sizeof(i2c_transaction_t), I2C_MEM_ALLOC_CAPS);
ESP_RETURN_ON_FALSE(i2c_master, ESP_ERR_NO_MEM, TAG, "no memory for i2c master bus");
ESP_GOTO_ON_ERROR(i2c_acquire_bus_handle(i2c_port_num, &i2c_master->base, I2C_BUS_MODE_MASTER), err, TAG, "I2C bus acquire failed");
i2c_port_num = i2c_master->base->port_num;
i2c_hal_context_t *hal = &i2c_master->base->hal;
i2c_master->base->scl_num = bus_config->scl_io_num;
i2c_master->base->sda_num = bus_config->sda_io_num;
i2c_master->base->pull_up_enable = bus_config->flags.enable_internal_pullup;
if (i2c_master->base->pull_up_enable == false) {
ESP_LOGW(TAG, "Please check pull-up resistances whether be connected properly. Otherwise unexpected behavior would happen. For more detailed information, please read docs");
}
ESP_GOTO_ON_ERROR(i2c_param_master_config(i2c_master->base, bus_config), err, TAG, "i2c configure parameter failed");
if (!i2c_master->base->is_lp_i2c) {
I2C_CLOCK_SRC_ATOMIC() {
i2c_ll_set_source_clk(hal->dev, i2c_master->base->clk_src);
}
}
#if SOC_LP_I2C_SUPPORTED
else {
LP_I2C_SRC_CLK_ATOMIC() {
lp_i2c_ll_set_source_clk(hal->dev, i2c_master->base->clk_src);
}
}
#endif
i2c_master->bus_lock_mux = xSemaphoreCreateBinaryWithCaps(I2C_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(i2c_master->bus_lock_mux, ESP_ERR_NO_MEM, err, TAG, "No memory for binary semaphore");
xSemaphoreGive(i2c_master->bus_lock_mux);
i2c_master->cmd_semphr = xSemaphoreCreateBinaryWithCaps(I2C_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(i2c_master->cmd_semphr, ESP_ERR_NO_MEM, err, TAG, "no memory for i2c semaphore struct");
i2c_master->event_queue = xQueueCreateWithCaps(1, sizeof(i2c_master_event_t), I2C_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(i2c_master->event_queue, ESP_ERR_NO_MEM, err, TAG, "no memory for i2c queue struct");
portENTER_CRITICAL(&i2c_master->base->spinlock);
i2c_ll_clear_intr_mask(hal->dev, I2C_LL_MASTER_EVENT_INTR);
portEXIT_CRITICAL(&i2c_master->base->spinlock);
if (bus_config->intr_priority) {
ESP_RETURN_ON_FALSE(1 << (bus_config->intr_priority) & I2C_ALLOW_INTR_PRIORITY_MASK, ESP_ERR_INVALID_ARG, TAG, "invalid interrupt priority:%d", bus_config->intr_priority);
}
xSemaphoreTake(i2c_master->bus_lock_mux, portMAX_DELAY);
SLIST_INIT(&i2c_master->device_list);
xSemaphoreGive(i2c_master->bus_lock_mux);
// Initialize the queue
if (bus_config->trans_queue_depth) {
ESP_LOGW(TAG, "Please note i2c asynchronous is only used for specific scenario currently. It's experimental for other users because user cannot get bus error from API. And It's not compatible with ``i2c_master_probe``. If user makes sure there won't be any error on bus and tested with no problem, this message can be ignored.");
i2c_master->async_trans = true;
i2c_master->sent_all = true;
i2c_master->trans_finish = true;
i2c_master->new_queue = true;
i2c_master->queue_size = bus_config->trans_queue_depth;
i2c_master->queues_storage = (uint8_t*)heap_caps_calloc(bus_config->trans_queue_depth * I2C_TRANS_QUEUE_MAX, sizeof(i2c_transaction_t), I2C_MEM_ALLOC_CAPS);
ESP_RETURN_ON_FALSE(i2c_master->queues_storage, ESP_ERR_NO_MEM, TAG, "no mem for queue storage");
i2c_transaction_t **pp_trans_desc = (i2c_transaction_t **)i2c_master->queues_storage;
for (int i = 0; i < I2C_TRANS_QUEUE_MAX; i++) {
i2c_master->trans_queues[i] = xQueueCreate(bus_config->trans_queue_depth, sizeof(i2c_transaction_t));
pp_trans_desc += bus_config->trans_queue_depth;
// sanity check
assert(i2c_master->trans_queues[i]);
}
i2c_transaction_t trans_pre = {};
for (int i = 0; i < bus_config->trans_queue_depth ; i++) {
trans_pre = i2c_master->i2c_trans_pool[i];
ESP_RETURN_ON_FALSE(xQueueSend(i2c_master->trans_queues[I2C_TRANS_QUEUE_READY], &trans_pre, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
}
i2c_master->i2c_async_ops = (i2c_operation_t(*)[I2C_STATIC_OPERATION_ARRAY_MAX])heap_caps_calloc(bus_config->trans_queue_depth, sizeof(*i2c_master->i2c_async_ops), I2C_MEM_ALLOC_CAPS);
ESP_RETURN_ON_FALSE(i2c_master->i2c_async_ops, ESP_ERR_NO_MEM, TAG, "no mem for operations");
i2c_master->ops_prepare_idx = 0;
}
int isr_flags = I2C_INTR_ALLOC_FLAG;
if (bus_config->intr_priority) {
isr_flags |= 1 << (bus_config->intr_priority);
}
ret = esp_intr_alloc_intrstatus(i2c_periph_signal[i2c_port_num].irq, isr_flags, (uint32_t)i2c_ll_get_interrupt_status_reg(hal->dev), I2C_LL_MASTER_EVENT_INTR, i2c_master_isr_handler_default, i2c_master, &i2c_master->base->intr_handle);
ESP_GOTO_ON_ERROR(ret, err, TAG, "install i2c master interrupt failed");
atomic_init(&i2c_master->status, I2C_STATUS_IDLE);
i2c_ll_master_set_filter(hal->dev, bus_config->glitch_ignore_cnt);
xSemaphoreGive(i2c_master->cmd_semphr);
*ret_bus_handle = i2c_master;
s_platform.handle[i2c_port_num] = i2c_master;
return ESP_OK;
err:
if (i2c_master) {
i2c_master_bus_destroy(i2c_master);
}
return ret;
}
esp_err_t i2c_master_bus_add_device(i2c_master_bus_handle_t bus_handle, const i2c_device_config_t *dev_config, i2c_master_dev_handle_t *ret_handle)
{
esp_err_t ret = ESP_OK;
ESP_RETURN_ON_FALSE((bus_handle != NULL), ESP_ERR_INVALID_ARG, TAG, "this bus is not initialized, please call `i2c_new_master_bus`");
ESP_RETURN_ON_FALSE(dev_config, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
ESP_RETURN_ON_FALSE(dev_config->scl_speed_hz > 0, ESP_ERR_INVALID_ARG, TAG, "invalid scl frequency");
if (bus_handle->base->bus_mode != I2C_BUS_MODE_MASTER) {
ESP_LOGE(TAG, "This is not master bus!");
return ESP_ERR_INVALID_ARG;
}
i2c_master_bus_t *i2c_master = bus_handle;
i2c_master_dev_t *i2c_dev = heap_caps_calloc(1, sizeof(i2c_master_dev_t), I2C_MEM_ALLOC_CAPS);
ESP_GOTO_ON_FALSE(i2c_dev, ESP_ERR_NO_MEM, err, TAG, "no memory for i2c master device");
i2c_dev->device_address = dev_config->device_address;
i2c_dev->scl_speed_hz = dev_config->scl_speed_hz;
i2c_dev->addr_10bits = dev_config->dev_addr_length;
i2c_dev->master_bus = i2c_master;
i2c_dev->ack_check_disable = dev_config->flags.disable_ack_check;
i2c_dev->scl_wait_us = (dev_config->scl_wait_us == 0) ? I2C_LL_SCL_WAIT_US_VAL_DEFAULT : dev_config->scl_wait_us;
i2c_master_device_list_t *device_item = (i2c_master_device_list_t *)calloc(1, sizeof(i2c_master_device_list_t));
ESP_GOTO_ON_FALSE((device_item != NULL), ESP_ERR_NO_MEM, err, TAG, "no memory for i2c device item`");
device_item->device = i2c_dev;
xSemaphoreTake(bus_handle->bus_lock_mux, portMAX_DELAY);
SLIST_INSERT_HEAD(&bus_handle->device_list, device_item, next);
xSemaphoreGive(bus_handle->bus_lock_mux);
*ret_handle = i2c_dev;
return ret;
err:
if (i2c_dev) {
i2c_master_bus_rm_device(i2c_dev);
}
return ret;
}
esp_err_t i2c_master_bus_rm_device(i2c_master_dev_handle_t handle)
{
ESP_RETURN_ON_FALSE((handle != NULL), ESP_ERR_INVALID_ARG, TAG, "this device is not initialized");
ESP_RETURN_ON_FALSE((((int)atomic_load(&handle->master_bus->status) > (int)I2C_STATUS_START)), ESP_ERR_INVALID_STATE, TAG, "Wrong I2C status, cannot delete device");
i2c_master_bus_handle_t i2c_master = handle->master_bus;
i2c_master_device_list_t *device_item;
xSemaphoreTake(handle->master_bus->bus_lock_mux, portMAX_DELAY);
SLIST_FOREACH(device_item, &i2c_master->device_list, next) {
if (handle == device_item->device) {
SLIST_REMOVE(&i2c_master->device_list, device_item, i2c_master_device_list, next);
free(device_item);
break;
}
}
xSemaphoreGive(handle->master_bus->bus_lock_mux);
if (handle) {
free(handle);
handle = NULL;
}
return ESP_OK;
}
esp_err_t i2c_del_master_bus(i2c_master_bus_handle_t bus_handle)
{
ESP_LOGD(TAG, "del i2c bus(%d)", bus_handle->base->port_num);
ESP_RETURN_ON_ERROR(i2c_master_bus_destroy(bus_handle), TAG, "destroy i2c bus failed");
return ESP_OK;
}
esp_err_t i2c_master_bus_reset(i2c_master_bus_handle_t bus_handle)
{
ESP_RETURN_ON_FALSE((bus_handle != NULL), ESP_ERR_INVALID_ARG, TAG, "This bus is not initialized");
// Reset I2C master bus
ESP_RETURN_ON_ERROR(s_i2c_hw_fsm_reset(bus_handle), TAG, "I2C master bus reset failed");
// Reset I2C status state
atomic_store(&bus_handle->status, I2C_STATUS_IDLE);
return ESP_OK;
}
esp_err_t i2c_master_get_bus_handle(i2c_port_num_t port_num, i2c_master_bus_handle_t *ret_handle)
{
ESP_RETURN_ON_FALSE((port_num < SOC_I2C_NUM), ESP_ERR_INVALID_ARG, TAG, "invalid i2c port number");
if (i2c_bus_occupied(port_num) == false) {
ESP_LOGE(TAG, "this port has not been initialized, please initialize it first");
return ESP_ERR_INVALID_STATE;
} else {
*ret_handle = s_platform.handle[port_num];
}
return ESP_OK;
}
esp_err_t i2c_master_multi_buffer_transmit(i2c_master_dev_handle_t i2c_dev, i2c_master_transmit_multi_buffer_info_t *buffer_info_array, size_t array_size, int xfer_timeout_ms)
{
ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
ESP_RETURN_ON_FALSE(array_size <= (SOC_I2C_CMD_REG_NUM - 2), ESP_ERR_INVALID_ARG, TAG, "i2c command list cannot contain so many commands");
ESP_RETURN_ON_FALSE(buffer_info_array != NULL, ESP_ERR_INVALID_ARG, TAG, "buffer info array is empty");
size_t op_index = 0;
i2c_operation_t i2c_ops[SOC_I2C_CMD_REG_NUM] = {};
i2c_ops[op_index++].hw_cmd.op_code = I2C_LL_CMD_RESTART;
for (int i = 0; i < array_size; i++) {
if (buffer_info_array[i].buffer_size == 0) {
continue;
}
i2c_ops[op_index].hw_cmd.ack_en = i2c_dev->ack_check_disable ? false : true;
i2c_ops[op_index].hw_cmd.op_code = I2C_LL_CMD_WRITE;
i2c_ops[op_index].data = (uint8_t*)buffer_info_array[i].write_buffer;
i2c_ops[op_index].total_bytes = buffer_info_array[i].buffer_size;
i2c_ops[op_index].bytes_used = 0;
op_index++;
}
i2c_ops[op_index++].hw_cmd.op_code = I2C_LL_CMD_STOP;
if (i2c_dev->master_bus->async_trans == false) {
ESP_RETURN_ON_ERROR(s_i2c_synchronous_transaction(i2c_dev, i2c_ops, op_index, xfer_timeout_ms), TAG, "I2C transaction failed");
} else {
ESP_RETURN_ON_ERROR(s_i2c_asynchronous_transaction(i2c_dev, i2c_ops, op_index, xfer_timeout_ms), TAG, "I2C transaction failed");
}
return ESP_OK;
}
esp_err_t i2c_master_transmit(i2c_master_dev_handle_t i2c_dev, const uint8_t *write_buffer, size_t write_size, int xfer_timeout_ms)
{
ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
ESP_RETURN_ON_FALSE((write_buffer != NULL) && (write_size > 0), ESP_ERR_INVALID_ARG, TAG, "i2c transmit buffer or size invalid");
i2c_master_transmit_multi_buffer_info_t buffer_info[1] = {
{.write_buffer = (uint8_t*)write_buffer, .buffer_size = write_size},
};
return i2c_master_multi_buffer_transmit(i2c_dev, buffer_info, 1, xfer_timeout_ms);
}
esp_err_t i2c_master_transmit_receive(i2c_master_dev_handle_t i2c_dev, const uint8_t *write_buffer, size_t write_size, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms)
{
ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
ESP_RETURN_ON_FALSE((write_buffer != NULL) && (write_size > 0), ESP_ERR_INVALID_ARG, TAG, "i2c transmit buffer or size invalid");
ESP_RETURN_ON_FALSE((read_buffer != NULL) && (read_size > 0), ESP_ERR_INVALID_ARG, TAG, "i2c receive buffer or size invalid");
i2c_operation_t i2c_ops[] = {
{.hw_cmd = I2C_TRANS_START_COMMAND},
{.hw_cmd = I2C_TRANS_WRITE_COMMAND(i2c_dev->ack_check_disable ? false : true), .data = (uint8_t *)write_buffer, .total_bytes = write_size},
{.hw_cmd = I2C_TRANS_START_COMMAND},
{.hw_cmd = I2C_TRANS_READ_COMMAND(ACK_VAL), .data = read_buffer, .total_bytes = read_size - 1},
{.hw_cmd = I2C_TRANS_READ_COMMAND(NACK_VAL), .data = (read_buffer + read_size - 1), .total_bytes = 1},
{.hw_cmd = I2C_TRANS_STOP_COMMAND},
};
if (i2c_dev->master_bus->async_trans == false) {
ESP_RETURN_ON_ERROR(s_i2c_synchronous_transaction(i2c_dev, i2c_ops, DIM(i2c_ops), xfer_timeout_ms), TAG, "I2C transaction failed");
} else {
ESP_RETURN_ON_ERROR(s_i2c_asynchronous_transaction(i2c_dev, i2c_ops, DIM(i2c_ops), xfer_timeout_ms), TAG, "I2C transaction failed");
}
return ESP_OK;
}
esp_err_t i2c_master_receive(i2c_master_dev_handle_t i2c_dev, uint8_t *read_buffer, size_t read_size, int xfer_timeout_ms)
{
ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
ESP_RETURN_ON_FALSE((read_buffer != NULL) && (read_size > 0), ESP_ERR_INVALID_ARG, TAG, "i2c receive buffer or size invalid");
i2c_operation_t i2c_ops[] = {
{.hw_cmd = I2C_TRANS_START_COMMAND},
{.hw_cmd = I2C_TRANS_READ_COMMAND(ACK_VAL), .data = read_buffer, .total_bytes = read_size - 1},
{.hw_cmd = I2C_TRANS_READ_COMMAND(NACK_VAL), .data = (read_buffer + read_size - 1), .total_bytes = 1},
{.hw_cmd = I2C_TRANS_STOP_COMMAND},
};
if (i2c_dev->master_bus->async_trans == false) {
ESP_RETURN_ON_ERROR(s_i2c_synchronous_transaction(i2c_dev, i2c_ops, DIM(i2c_ops), xfer_timeout_ms), TAG, "I2C transaction failed");
} else {
ESP_RETURN_ON_ERROR(s_i2c_asynchronous_transaction(i2c_dev, i2c_ops, DIM(i2c_ops), xfer_timeout_ms), TAG, "I2C transaction failed");
}
return ESP_OK;
}
esp_err_t i2c_master_probe(i2c_master_bus_handle_t bus_handle, uint16_t address, int xfer_timeout_ms)
{
ESP_RETURN_ON_FALSE(bus_handle != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
TickType_t ticks_to_wait = (xfer_timeout_ms == -1) ? portMAX_DELAY : pdMS_TO_TICKS(xfer_timeout_ms);
if (xSemaphoreTake(bus_handle->bus_lock_mux, ticks_to_wait) != pdTRUE) {
return ESP_ERR_TIMEOUT;
}
esp_err_t ret = ESP_OK;
bus_handle->cmd_idx = 0;
bus_handle->trans_idx = 0;
bus_handle->trans_done = false;
bus_handle->status = I2C_STATUS_IDLE;
bus_handle->bypass_nack_log = true;
i2c_hal_context_t *hal = &bus_handle->base->hal;
i2c_operation_t i2c_ops[] = {
{.hw_cmd = I2C_TRANS_START_COMMAND},
{.hw_cmd = I2C_TRANS_STOP_COMMAND},
};
bus_handle->i2c_trans = (i2c_transaction_t) {
.device_address = address,
.ops = i2c_ops,
.cmd_count = DIM(i2c_ops),
};
// I2C probe does not have i2c device module. So set the clock parameter independently
// This will not influence device transaction.
I2C_CLOCK_SRC_ATOMIC() {
i2c_ll_set_source_clk(hal->dev, bus_handle->base->clk_src);
i2c_hal_set_bus_timing(hal, 100000, bus_handle->base->clk_src, bus_handle->base->clk_src_freq_hz);
}
i2c_ll_master_set_fractional_divider(hal->dev, 0, 0);
i2c_ll_enable_intr_mask(hal->dev, I2C_LL_MASTER_EVENT_INTR);
i2c_ll_update(hal->dev);
s_i2c_send_commands(bus_handle, ticks_to_wait);
if (bus_handle->status == I2C_STATUS_ACK_ERROR) {
ret = ESP_ERR_NOT_FOUND;
} else if (bus_handle->status == I2C_STATUS_TIMEOUT) {
ESP_LOGE(TAG, "probe device timeout. Please check if xfer_timeout_ms and pull-ups are correctly set up");
ret = ESP_ERR_TIMEOUT;
}
// Reset the status to done, in order not influence next time transaction.
bus_handle->status = I2C_STATUS_DONE;
bus_handle->bypass_nack_log = false;
i2c_ll_disable_intr_mask(hal->dev, I2C_LL_MASTER_EVENT_INTR);
xSemaphoreGive(bus_handle->bus_lock_mux);
return ret;
}
esp_err_t i2c_master_register_event_callbacks(i2c_master_dev_handle_t i2c_dev, const i2c_master_event_callbacks_t *cbs, void *user_data)
{
ESP_RETURN_ON_FALSE(i2c_dev != NULL, ESP_ERR_INVALID_ARG, TAG, "i2c handle not initialized");
if (i2c_dev->master_bus->async_trans == false) {
ESP_LOGE(TAG, "I2C transaction queue is not initialized, so you can't use callback here, please resister the bus again with trans_queue_depth != 0");
return ESP_ERR_INVALID_STATE;
}
#if CONFIG_I2C_ISR_IRAM_SAFE
if (cbs->on_trans_done) {
ESP_RETURN_ON_FALSE(esp_ptr_in_iram(cbs->on_trans_done), ESP_ERR_INVALID_ARG, TAG, "i2c trans done callback not in IRAM");
}
if (user_data) {
ESP_RETURN_ON_FALSE(esp_ptr_internal(user_data), ESP_ERR_INVALID_ARG, TAG, "user context not in internal RAM");
}
#endif // CONFIG_I2C_ISR_IRAM_SAFE
i2c_dev->on_trans_done = cbs->on_trans_done;
i2c_dev->user_ctx = user_data;
return ESP_OK;
}
esp_err_t i2c_master_bus_wait_all_done(i2c_master_bus_handle_t bus_handle, int timeout_ms)
{
ESP_RETURN_ON_FALSE(bus_handle, ESP_ERR_INVALID_ARG, TAG, "invalid argument");
TickType_t wait_ticks = timeout_ms < 0 ? portMAX_DELAY : pdMS_TO_TICKS(timeout_ms);
i2c_transaction_t t;
size_t cnt = bus_handle->num_trans_inflight;
for (size_t i = 0; i < cnt; i++) {
ESP_RETURN_ON_FALSE(xQueueReceive(bus_handle->trans_queues[I2C_TRANS_QUEUE_COMPLETE], &t, wait_ticks) == pdTRUE,
ESP_ERR_TIMEOUT, TAG, "flush timeout");
ESP_RETURN_ON_FALSE(xQueueSend(bus_handle->trans_queues[I2C_TRANS_QUEUE_READY], &t, 0) == pdTRUE,
ESP_ERR_INVALID_STATE, TAG, "ready queue full");
bus_handle->num_trans_inflight--;
}
return ESP_OK;
}
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