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esp-idf/components/driver/sdspi/sdspi_host.c

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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <stddef.h>
#include <sys/param.h>
#include "esp_log.h"
#include "esp_heap_caps.h"
#include "driver/gpio.h"
#include "driver/sdmmc_defs.h"
#include "driver/sdspi_host.h"
#include "sdspi_private.h"
#include "sdspi_crc.h"
#include "esp_timer.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "soc/soc_memory_layout.h"
/// Max number of transactions in flight (used in start_command_write_blocks)
#define SDSPI_TRANSACTION_COUNT 4
#define SDSPI_MOSI_IDLE_VAL 0xff //!< Data value which causes MOSI to stay high
#define GPIO_UNUSED 0xff //!< Flag indicating that CD/WP is unused
/// Size of the buffer returned by get_block_buf
#define SDSPI_BLOCK_BUF_SIZE (SDSPI_MAX_DATA_LEN + 4)
/// Maximum number of dummy bytes between the request and response (minimum is 1)
#define SDSPI_RESPONSE_MAX_DELAY 8
/**
* @brief Structure containing run time configuration for a single SD slot
*
* The slot info is referenced to by an sdspi_dev_handle_t (alias int). The handle may be the raw
* pointer to the slot info itself (force converted to, new API in IDFv4.2), or the index of the
* s_slot array (deprecated API). Returning the raw pointer to the caller instead of storing it
* locally can save some static memory.
*/
typedef struct {
spi_host_device_t host_id; //!< SPI host id.
spi_device_handle_t spi_handle; //!< SPI device handle, used for transactions
uint8_t gpio_cs; //!< CS GPIO, or GPIO_UNUSED
uint8_t gpio_cd; //!< Card detect GPIO, or GPIO_UNUSED
uint8_t gpio_wp; //!< Write protect GPIO, or GPIO_UNUSED
uint8_t gpio_int; //!< Write protect GPIO, or GPIO_UNUSED
/// GPIO write protect polarity.
/// 0 means "active low", i.e. card is protected when the GPIO is low;
/// 1 means "active high", i.e. card is protected when GPIO is high.
uint8_t gpio_wp_polarity : 1;
/// Set to 1 if the higher layer has asked the card to enable CRC checks
uint8_t data_crc_enabled : 1;
/// Intermediate buffer used when application buffer is not in DMA memory;
/// allocated on demand, SDSPI_BLOCK_BUF_SIZE bytes long. May be zero.
uint8_t* block_buf;
/// semaphore of gpio interrupt
SemaphoreHandle_t semphr_int;
} slot_info_t;
// Reserved for old API to be back-compatible
static slot_info_t *s_slots[SOC_SPI_PERIPH_NUM] = {};
static const char *TAG = "sdspi_host";
static const bool use_polling = true;
static const bool no_use_polling = true;
/// Functions to send out different kinds of commands
static esp_err_t start_command_read_blocks(slot_info_t *slot, sdspi_hw_cmd_t *cmd,
uint8_t *data, uint32_t rx_length, bool need_stop_command);
static esp_err_t start_command_write_blocks(slot_info_t *slot, sdspi_hw_cmd_t *cmd,
const uint8_t *data, uint32_t tx_length, bool multi_block, bool stop_trans);
static esp_err_t start_command_default(slot_info_t *slot, int flags, sdspi_hw_cmd_t *cmd);
static esp_err_t shift_cmd_response(sdspi_hw_cmd_t *cmd, int sent_bytes);
static esp_err_t poll_busy(slot_info_t *slot, int timeout_ms, bool polling);
/// A few helper functions
/// Map handle to pointer of slot information
static slot_info_t* get_slot_info(sdspi_dev_handle_t handle)
{
if ((uint32_t) handle < SOC_SPI_PERIPH_NUM) {
return s_slots[handle];
} else {
return (slot_info_t *) handle;
}
}
/// Store slot information (if possible) and return corresponding handle
static sdspi_dev_handle_t store_slot_info(slot_info_t *slot)
{
/*
* To be back-compatible, the first device of each bus will always be stored locally, and
* referenced to by the handle `host_id`, otherwise the new API return the raw pointer to the
* slot info as the handle, to save some static memory.
*/
if (s_slots[slot->host_id] == NULL) {
s_slots[slot->host_id] = slot;
return slot->host_id;
} else {
return (sdspi_dev_handle_t)slot;
}
}
/// Get the slot info for a specific handle, and remove the local reference (if exist).
static slot_info_t* remove_slot_info(sdspi_dev_handle_t handle)
{
if ((uint32_t) handle < SOC_SPI_PERIPH_NUM) {
slot_info_t* slot = s_slots[handle];
s_slots[handle] = NULL;
return slot;
} else {
return (slot_info_t *) handle;
}
}
/// Set CS high for given slot
static void cs_high(slot_info_t *slot)
{
if (slot->gpio_cs != GPIO_UNUSED) {
gpio_set_level(slot->gpio_cs, 1);
}
}
/// Set CS low for given slot
static void cs_low(slot_info_t *slot)
{
if (slot->gpio_cs != GPIO_UNUSED) {
gpio_set_level(slot->gpio_cs, 0);
}
}
/// Return true if WP pin is configured and is set as per its polarity
static bool card_write_protected(slot_info_t *slot)
{
if (slot->gpio_wp == GPIO_UNUSED) {
return false;
}
return gpio_get_level(slot->gpio_wp) == (slot->gpio_wp_polarity ? 1 : 0);
}
/// Return true if CD pin is configured and is high
static bool card_missing(slot_info_t *slot)
{
if (slot->gpio_cd == GPIO_UNUSED) {
return false;
}
return gpio_get_level(slot->gpio_cd) == 1;
}
/// Get pointer to a block of DMA memory, allocate if necessary.
/// This is used if the application provided buffer is not in DMA capable memory.
static esp_err_t get_block_buf(slot_info_t *slot, uint8_t **out_buf)
{
if (slot->block_buf == NULL) {
slot->block_buf = heap_caps_malloc(SDSPI_BLOCK_BUF_SIZE, MALLOC_CAP_DMA);
if (slot->block_buf == NULL) {
return ESP_ERR_NO_MEM;
}
}
*out_buf = slot->block_buf;
return ESP_OK;
}
/// Clock out one byte (CS has to be high) to make the card release MISO
/// (clocking one bit would work as well, but that triggers a bug in SPI DMA)
static void release_bus(slot_info_t *slot)
{
spi_transaction_t t = {
.flags = SPI_TRANS_USE_RXDATA | SPI_TRANS_USE_TXDATA,
.length = 8,
.tx_data = {0xff}
};
spi_device_polling_transmit(slot->spi_handle, &t);
// don't care if this failed
}
/// Clock out 80 cycles (10 bytes) before GO_IDLE command
static void go_idle_clockout(slot_info_t *slot)
{
//actually we need 10, declare 12 to meet requirement of RXDMA
uint8_t data[12];
memset(data, 0xff, sizeof(data));
spi_transaction_t t = {
.length = 10 * 8,
.tx_buffer = data,
.rx_buffer = data,
};
spi_device_polling_transmit(slot->spi_handle, &t);
// don't care if this failed
}
/**
* (Re)Configure SPI device. Used to change clock speed.
* @param slot Pointer to the slot to be configured
* @param clock_speed_hz clock speed, Hz
* @return ESP_OK on success
*/
static esp_err_t configure_spi_dev(slot_info_t *slot, int clock_speed_hz)
{
if (slot->spi_handle) {
// Reinitializing
spi_bus_remove_device(slot->spi_handle);
slot->spi_handle = NULL;
}
spi_device_interface_config_t devcfg = {
.clock_speed_hz = clock_speed_hz,
.mode = 0,
// For SD cards, CS must stay low during the whole read/write operation,
// rather than a single SPI transaction.
.spics_io_num = GPIO_NUM_NC,
.queue_size = SDSPI_TRANSACTION_COUNT,
};
return spi_bus_add_device(slot->host_id, &devcfg, &slot->spi_handle);
}
esp_err_t sdspi_host_init(void)
{
return ESP_OK;
}
static esp_err_t deinit_slot(slot_info_t *slot)
{
esp_err_t err = ESP_OK;
if (slot->spi_handle) {
spi_bus_remove_device(slot->spi_handle);
slot->spi_handle = NULL;
free(slot->block_buf);
slot->block_buf = NULL;
}
uint64_t pin_bit_mask = 0;
if (slot->gpio_cs != GPIO_UNUSED) {
pin_bit_mask |= BIT64(slot->gpio_cs);
}
if (slot->gpio_cd != GPIO_UNUSED) {
pin_bit_mask |= BIT64(slot->gpio_cd);
}
if (slot->gpio_wp != GPIO_UNUSED) {
pin_bit_mask |= BIT64(slot->gpio_wp);
}
if (slot->gpio_int != GPIO_UNUSED) {
pin_bit_mask |= BIT64(slot->gpio_int);
gpio_intr_disable(slot->gpio_int);
gpio_isr_handler_remove(slot->gpio_int);
}
gpio_config_t config = {
.pin_bit_mask = pin_bit_mask,
.mode = GPIO_MODE_INPUT,
.intr_type = GPIO_INTR_DISABLE,
};
if (pin_bit_mask != 0) {
gpio_config(&config);
}
if (slot->semphr_int) {
vSemaphoreDelete(slot->semphr_int);
slot->semphr_int = NULL;
}
free(slot);
return err;
}
esp_err_t sdspi_host_remove_device(sdspi_dev_handle_t handle)
{
//Get the slot info and remove the reference in the static memory (if used)
slot_info_t* slot = remove_slot_info(handle);
if (slot == NULL) {
return ESP_ERR_INVALID_ARG;
}
deinit_slot(slot);
return ESP_OK;
}
//only the slots locally stored can be deinit in this function.
esp_err_t sdspi_host_deinit(void)
{
for (size_t i = 0; i < sizeof(s_slots) / sizeof(s_slots[0]); ++i) {
slot_info_t* slot = remove_slot_info(i);
//slot isn't used, skip
if (slot == NULL) {
continue;
}
deinit_slot(slot);
}
return ESP_OK;
}
esp_err_t sdspi_host_set_card_clk(sdspi_dev_handle_t handle, uint32_t freq_khz)
{
slot_info_t *slot = get_slot_info(handle);
if (slot == NULL) {
return ESP_ERR_INVALID_ARG;
}
ESP_LOGD(TAG, "Setting card clock to %"PRIu32" kHz", freq_khz);
return configure_spi_dev(slot, freq_khz * 1000);
}
esp_err_t sdspi_host_get_real_freq(sdspi_dev_handle_t handle, int* real_freq_khz)
{
slot_info_t *slot = get_slot_info(handle);
if (slot == NULL) {
return ESP_ERR_INVALID_ARG;
}
return spi_device_get_actual_freq(slot->spi_handle, real_freq_khz);
}
static void gpio_intr(void* arg)
{
BaseType_t awoken = pdFALSE;
slot_info_t* slot = (slot_info_t*)arg;
xSemaphoreGiveFromISR(slot->semphr_int, &awoken);
gpio_intr_disable(slot->gpio_int);
if (awoken) {
portYIELD_FROM_ISR();
}
}
esp_err_t sdspi_host_init_device(const sdspi_device_config_t* slot_config, sdspi_dev_handle_t* out_handle)
{
ESP_LOGD(TAG, "%s: SPI%d cs=%d cd=%d wp=%d wp_polarity:%d",
__func__, slot_config->host_id + 1, slot_config->gpio_cs,
slot_config->gpio_cd, slot_config->gpio_wp, slot_config->gpio_wp_polarity);
slot_info_t* slot = (slot_info_t*)malloc(sizeof(slot_info_t));
if (slot == NULL) {
return ESP_ERR_NO_MEM;
}
*slot = (slot_info_t) {
.host_id = slot_config->host_id,
.gpio_cs = slot_config->gpio_cs,
};
// Attach the SD card to the SPI bus
esp_err_t ret = configure_spi_dev(slot, SDMMC_FREQ_PROBING * 1000);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "spi_bus_add_device failed with rc=0x%x", ret);
goto cleanup;
}
// Configure CS pin
gpio_config_t io_conf = {
.intr_type = GPIO_INTR_DISABLE,
.mode = GPIO_MODE_OUTPUT,
.pin_bit_mask = 1ULL << slot_config->gpio_cs,
};
if (slot_config->gpio_cs != SDSPI_SLOT_NO_CS) {
slot->gpio_cs = slot_config->gpio_cs;
} else {
slot->gpio_cs = GPIO_UNUSED;
}
if (slot->gpio_cs != GPIO_UNUSED) {
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "gpio_config (CS) failed with rc=0x%x", ret);
goto cleanup;
}
cs_high(slot);
}
// Configure CD and WP pins
io_conf = (gpio_config_t) {
.intr_type = GPIO_INTR_DISABLE,
.mode = GPIO_MODE_INPUT,
.pin_bit_mask = 0,
.pull_up_en = true
};
if (slot_config->gpio_cd != SDSPI_SLOT_NO_CD) {
io_conf.pin_bit_mask |= (1ULL << slot_config->gpio_cd);
slot->gpio_cd = slot_config->gpio_cd;
} else {
slot->gpio_cd = GPIO_UNUSED;
}
if (slot_config->gpio_wp != SDSPI_SLOT_NO_WP) {
io_conf.pin_bit_mask |= (1ULL << slot_config->gpio_wp);
slot->gpio_wp = slot_config->gpio_wp;
slot->gpio_wp_polarity = slot_config->gpio_wp_polarity;
if (slot->gpio_wp_polarity) {
io_conf.pull_down_en = true;
io_conf.pull_up_en = false;
}
} else {
slot->gpio_wp = GPIO_UNUSED;
}
if (io_conf.pin_bit_mask != 0) {
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "gpio_config (CD/WP) failed with rc=0x%x", ret);
goto cleanup;
}
}
if (slot_config->gpio_int != SDSPI_SLOT_NO_INT) {
slot->gpio_int = slot_config->gpio_int;
io_conf = (gpio_config_t) {
.intr_type = GPIO_INTR_LOW_LEVEL,
.mode = GPIO_MODE_INPUT,
.pull_up_en = true,
.pin_bit_mask = (1ULL << slot_config->gpio_int),
};
ret = gpio_config(&io_conf);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "gpio_config (interrupt) failed with rc=0x%x", ret);
goto cleanup;
}
slot->semphr_int = xSemaphoreCreateBinary();
if (slot->semphr_int == NULL) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
gpio_intr_disable(slot->gpio_int);
// 1. the interrupt is better to be disabled before the ISR is registered
// 2. the semaphore MUST be initialized before the ISR is registered
// 3. the gpio_int member should be filled before the ISR is registered
ret = gpio_isr_handler_add(slot->gpio_int, &gpio_intr, slot);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "gpio_isr_handle_add failed with rc=0x%x", ret);
goto cleanup;
}
} else {
slot->gpio_int = GPIO_UNUSED;
}
//Initialization finished, store the store information if possible
//Then return corresponding handle
*out_handle = store_slot_info(slot);
return ESP_OK;
cleanup:
if (slot->semphr_int) {
vSemaphoreDelete(slot->semphr_int);
slot->semphr_int = NULL;
}
if (slot->spi_handle) {
spi_bus_remove_device(slot->spi_handle);
slot->spi_handle = NULL;
}
free(slot);
return ret;
}
esp_err_t sdspi_host_start_command(sdspi_dev_handle_t handle, sdspi_hw_cmd_t *cmd, void *data,
uint32_t data_size, int flags)
{
slot_info_t *slot = get_slot_info(handle);
if (slot == NULL) {
return ESP_ERR_INVALID_ARG;
}
if (card_missing(slot)) {
return ESP_ERR_NOT_FOUND;
}
// save some parts of cmd, as its contents will be overwritten
int cmd_index = cmd->cmd_index;
uint32_t cmd_arg;
memcpy(&cmd_arg, cmd->arguments, sizeof(cmd_arg));
cmd_arg = __builtin_bswap32(cmd_arg);
ESP_LOGV(TAG, "%s: slot=%i, CMD%d, arg=0x%08"PRIx32" flags=0x%x, data=%p, data_size=%"PRIu32" crc=0x%02x",
__func__, handle, cmd_index, cmd_arg, flags, data, data_size, cmd->crc7);
spi_device_acquire_bus(slot->spi_handle, portMAX_DELAY);
poll_busy(slot, 40, true);
// For CMD0, clock out 80 cycles to help the card enter idle state,
// *before* CS is asserted.
if (cmd_index == MMC_GO_IDLE_STATE) {
go_idle_clockout(slot);
}
// actual transaction
esp_err_t ret = ESP_OK;
cs_low(slot);
if (flags & SDSPI_CMD_FLAG_DATA) {
const bool multi_block = flags & SDSPI_CMD_FLAG_MULTI_BLK;
//send stop transmission token only when multi-block write and non-SDIO mode
const bool stop_transmission = multi_block && !(flags & SDSPI_CMD_FLAG_RSP_R5);
if (flags & SDSPI_CMD_FLAG_WRITE) {
ret = start_command_write_blocks(slot, cmd, data, data_size, multi_block, stop_transmission);
} else {
ret = start_command_read_blocks(slot, cmd, data, data_size, stop_transmission);
}
} else {
ret = start_command_default(slot, flags, cmd);
}
cs_high(slot);
release_bus(slot);
spi_device_release_bus(slot->spi_handle);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "%s: cmd=%d error=0x%x", __func__, cmd_index, ret);
} else {
// Update internal state when some commands are sent successfully
if (cmd_index == SD_CRC_ON_OFF) {
slot->data_crc_enabled = (uint8_t) cmd_arg;
ESP_LOGD(TAG, "data CRC set=%d", slot->data_crc_enabled);
}
}
return ret;
}
static esp_err_t start_command_default(slot_info_t *slot, int flags, sdspi_hw_cmd_t *cmd)
{
size_t cmd_size = SDSPI_CMD_R1_SIZE;
if ((flags & SDSPI_CMD_FLAG_RSP_R1) ||
(flags & SDSPI_CMD_FLAG_NORSP) ||
(flags & SDSPI_CMD_FLAG_RSP_R1B)) {
cmd_size = SDSPI_CMD_R1_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R2) {
cmd_size = SDSPI_CMD_R2_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R3) {
cmd_size = SDSPI_CMD_R3_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R4) {
cmd_size = SDSPI_CMD_R4_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R5) {
cmd_size = SDSPI_CMD_R5_SIZE;
} else if (flags & SDSPI_CMD_FLAG_RSP_R7) {
cmd_size = SDSPI_CMD_R7_SIZE;
}
//add extra clocks to avoid polling
cmd_size += (SDSPI_NCR_MAX_SIZE - SDSPI_NCR_MIN_SIZE);
spi_transaction_t t = {
.flags = 0,
.length = cmd_size * 8,
.tx_buffer = cmd,
.rx_buffer = cmd,
};
esp_err_t ret = spi_device_polling_transmit(slot->spi_handle, &t);
if (cmd->cmd_index == MMC_STOP_TRANSMISSION) {
/* response is a stuff byte from previous transfer, ignore it */
cmd->r1 = 0xff;
}
if (ret != ESP_OK) {
ESP_LOGD(TAG, "%s: spi_device_polling_transmit returned 0x%x", __func__, ret);
return ret;
}
if (flags & SDSPI_CMD_FLAG_NORSP) {
/* no (correct) response expected from the card, so skip polling loop */
ESP_LOGV(TAG, "%s: ignoring response byte", __func__);
cmd->r1 = 0x00;
}
// we have sent and received bytes with enough length.
// now shift the response to match the offset of sdspi_hw_cmd_t
ret = shift_cmd_response(cmd, cmd_size);
if (ret != ESP_OK) {
return ESP_ERR_TIMEOUT;
}
if (flags & SDSPI_CMD_FLAG_RSP_R1B) {
ret = poll_busy(slot, cmd->timeout_ms, no_use_polling);
if (ret != ESP_OK) {
return ret;
}
}
return ESP_OK;
}
// Wait until MISO goes high
static esp_err_t poll_busy(slot_info_t *slot, int timeout_ms, bool polling)
{
uint8_t t_rx;
spi_transaction_t t = {
.tx_buffer = &t_rx,
.flags = SPI_TRANS_USE_RXDATA, //data stored in rx_data
.length = 8,
};
esp_err_t ret;
int64_t t_end = esp_timer_get_time() + timeout_ms * 1000;
int nonzero_count = 0;
do {
t_rx = SDSPI_MOSI_IDLE_VAL;
t.rx_data[0] = 0;
if (polling) {
ret = spi_device_polling_transmit(slot->spi_handle, &t);
} else {
ret = spi_device_transmit(slot->spi_handle, &t);
}
if (ret != ESP_OK) {
return ret;
}
if (t.rx_data[0] != 0) {
if (++nonzero_count == 2) {
return ESP_OK;
}
}
} while (esp_timer_get_time() < t_end);
ESP_LOGD(TAG, "%s: timeout", __func__);
return ESP_ERR_TIMEOUT;
}
// Wait for data token, reading 8 bytes at a time.
// If the token is found, write all subsequent bytes to extra_ptr,
// and store the number of bytes written to extra_size.
static esp_err_t poll_data_token(slot_info_t *slot, uint8_t *extra_ptr, size_t *extra_size, int timeout_ms)
{
uint8_t t_rx[8];
spi_transaction_t t = {
.tx_buffer = &t_rx,
.rx_buffer = &t_rx,
.length = sizeof(t_rx) * 8,
};
esp_err_t ret;
int64_t t_end = esp_timer_get_time() + timeout_ms * 1000;
do {
memset(t_rx, SDSPI_MOSI_IDLE_VAL, sizeof(t_rx));
ret = spi_device_polling_transmit(slot->spi_handle, &t);
if (ret != ESP_OK) {
return ret;
}
bool found = false;
for (size_t byte_idx = 0; byte_idx < sizeof(t_rx); byte_idx++) {
uint8_t rd_data = t_rx[byte_idx];
if (rd_data == TOKEN_BLOCK_START) {
found = true;
memcpy(extra_ptr, t_rx + byte_idx + 1, sizeof(t_rx) - byte_idx - 1);
*extra_size = sizeof(t_rx) - byte_idx - 1;
break;
}
if (rd_data != 0xff && rd_data != 0) {
ESP_LOGD(TAG, "%s: received 0x%02x while waiting for data",
__func__, rd_data);
return ESP_ERR_INVALID_RESPONSE;
}
}
if (found) {
return ESP_OK;
}
} while (esp_timer_get_time() < t_end);
ESP_LOGD(TAG, "%s: timeout", __func__);
return ESP_ERR_TIMEOUT;
}
// the r1 respond could appear 1-8 clocks after the command token is sent
// this function search for r1 in the buffer after 1 clocks to max 8 clocks
// then shift the data after R1, to match the definition of sdspi_hw_cmd_t.
static esp_err_t shift_cmd_response(sdspi_hw_cmd_t* cmd, int sent_bytes)
{
uint8_t* pr1 = &cmd->r1;
int ncr_cnt = 1;
while (true) {
if ((*pr1 & SD_SPI_R1_NO_RESPONSE) == 0) {
break;
}
pr1++;
if (++ncr_cnt > 8) {
return ESP_ERR_NOT_FOUND;
}
}
int copy_bytes = sent_bytes - SDSPI_CMD_SIZE - ncr_cnt;
if (copy_bytes > 0) {
memcpy(&cmd->r1, pr1, copy_bytes);
}
return ESP_OK;
}
/**
* Receiving one or more blocks of data happens as follows:
* 1. send command + receive r1 response (SDSPI_CMD_R1_SIZE bytes total)
* 2. keep receiving bytes until TOKEN_BLOCK_START is encountered (this may
* take a while, depending on card's read speed)
* 3. receive up to SDSPI_MAX_DATA_LEN = 512 bytes of actual data
* 4. receive 2 bytes of CRC
* 5. for multi block transfers, go to step 2
*
* These steps can be done separately, but that leads to a less than optimal
* performance on large transfers because of delays between each step.
* For example, if steps 3 and 4 are separate SPI transactions queued one after
* another, there will be ~16 microseconds of dead time between end of step 3
* and the beginning of step 4. A delay between two blocking SPI transactions
* in step 2 is even higher (~60 microseconds).
*
* To improve read performance the following sequence is adopted:
* 1. Do the first transfer: command + r1 response + 8 extra bytes.
* Set pre_scan_data_ptr to point to the 8 extra bytes, and set
* pre_scan_data_size to 8.
* 2. Search pre_scan_data_size bytes for TOKEN_BLOCK_START.
* If found, the rest of the bytes contain part of the actual data.
* Store pointer to and size of that extra data as extra_data_{ptr,size}.
* If not found, fall back to polling for TOKEN_BLOCK_START, 8 bytes at a
* time (in poll_data_token function). Deal with extra data in the same way,
* by setting extra_data_{ptr,size}.
* 3. Receive the remaining 512 - extra_data_size bytes, plus 4 extra bytes
* (i.e. 516 - extra_data_size). Of the 4 extra bytes, first two will capture
* the CRC value, and the other two will capture 0xff 0xfe sequence
* indicating the start of the next block. Actual scanning is done by
* setting pre_scan_data_ptr to point to these last 2 bytes, and setting
* pre_scan_data_size = 2, then going to step 2 to receive the next block.
* When the final block is being received, the number of extra bytes is 2
* (only for CRC), because we don't need to wait for start token of the
* next block, and some cards are getting confused by these two extra bytes.
*
* With this approach the delay between blocks of a multi-block transfer is
* ~95 microseconds, out of which 35 microseconds are spend doing the CRC check.
* Further speedup is possible by pipelining transfers and CRC checks, at an
* expense of one extra temporary buffer.
*/
static esp_err_t start_command_read_blocks(slot_info_t *slot, sdspi_hw_cmd_t *cmd,
uint8_t *data, uint32_t rx_length, bool need_stop_command)
{
spi_transaction_t t_command = {
.length = (SDSPI_CMD_R1_SIZE + SDSPI_RESPONSE_MAX_DELAY) * 8,
.tx_buffer = cmd,
.rx_buffer = cmd,
};
esp_err_t ret = spi_device_polling_transmit(slot->spi_handle, &t_command);
if (ret != ESP_OK) {
return ret;
}
uint8_t* cmd_u8 = (uint8_t*) cmd;
size_t pre_scan_data_size = SDSPI_RESPONSE_MAX_DELAY;
uint8_t* pre_scan_data_ptr = cmd_u8 + SDSPI_CMD_R1_SIZE;
/* R1 response is delayed by 1-8 bytes from the request.
* This loop searches for the response and writes it to cmd->r1.
*/
while ((cmd->r1 & SD_SPI_R1_NO_RESPONSE) != 0 && pre_scan_data_size > 0) {
cmd->r1 = *pre_scan_data_ptr;
++pre_scan_data_ptr;
--pre_scan_data_size;
}
if (cmd->r1 & SD_SPI_R1_NO_RESPONSE) {
ESP_LOGD(TAG, "no response token found");
return ESP_ERR_TIMEOUT;
}
while (rx_length > 0) {
size_t extra_data_size = 0;
const uint8_t* extra_data_ptr = NULL;
bool need_poll = true;
for (size_t i = 0; i < pre_scan_data_size; ++i) {
if (pre_scan_data_ptr[i] == TOKEN_BLOCK_START) {
extra_data_size = pre_scan_data_size - i - 1;
extra_data_ptr = pre_scan_data_ptr + i + 1;
need_poll = false;
break;
}
}
if (need_poll) {
// Wait for data to be ready
ret = poll_data_token(slot, cmd_u8 + SDSPI_CMD_R1_SIZE, &extra_data_size, cmd->timeout_ms);
if (ret != ESP_OK) {
return ret;
}
if (extra_data_size) {
extra_data_ptr = cmd_u8 + SDSPI_CMD_R1_SIZE;
}
}
// Arrange RX buffer
size_t will_receive = MIN(rx_length, SDSPI_MAX_DATA_LEN) - extra_data_size;
uint8_t* rx_data;
ret = get_block_buf(slot, &rx_data);
if (ret != ESP_OK) {
return ret;
}
// receive actual data
const size_t receive_extra_bytes = (rx_length > SDSPI_MAX_DATA_LEN) ? 4 : 2;
memset(rx_data, 0xff, will_receive + receive_extra_bytes);
spi_transaction_t t_data = {
.length = (will_receive + receive_extra_bytes) * 8,
.rx_buffer = rx_data,
.tx_buffer = rx_data
};
ret = spi_device_transmit(slot->spi_handle, &t_data);
if (ret != ESP_OK) {
return ret;
}
// CRC bytes need to be received even if CRC is not enabled
uint16_t crc = UINT16_MAX;
memcpy(&crc, rx_data + will_receive, sizeof(crc));
// Bytes to scan for the start token
pre_scan_data_size = receive_extra_bytes - sizeof(crc);
pre_scan_data_ptr = rx_data + will_receive + sizeof(crc);
// Copy data to the destination buffer
memcpy(data + extra_data_size, rx_data, will_receive);
if (extra_data_size) {
memcpy(data, extra_data_ptr, extra_data_size);
}
// compute CRC of the received data
uint16_t crc_of_data = 0;
if (slot->data_crc_enabled) {
crc_of_data = sdspi_crc16(data, will_receive + extra_data_size);
if (crc_of_data != crc) {
ESP_LOGE(TAG, "data CRC failed, got=0x%04x expected=0x%04x", crc_of_data, crc);
esp_log_buffer_hex(TAG, data, 16);
return ESP_ERR_INVALID_CRC;
}
}
data += will_receive + extra_data_size;
rx_length -= will_receive + extra_data_size;
extra_data_size = 0;
extra_data_ptr = NULL;
}
if (need_stop_command) {
// To end multi block transfer, send stop command and wait for the
// card to process it
sdspi_hw_cmd_t stop_cmd;
make_hw_cmd(MMC_STOP_TRANSMISSION, 0, cmd->timeout_ms, &stop_cmd);
ret = start_command_default(slot, SDSPI_CMD_FLAG_RSP_R1B, &stop_cmd);
if (ret != ESP_OK) {
return ret;
}
if (stop_cmd.r1 != 0) {
ESP_LOGD(TAG, "%s: STOP_TRANSMISSION response 0x%02x", __func__, stop_cmd.r1);
}
ret = poll_busy(slot, cmd->timeout_ms, use_polling);
if (ret != ESP_OK) {
return ret;
}
}
return ESP_OK;
}
/* For CMD53, we can send in byte mode, or block mode
* The data start token is different, and cannot be determined by the length
* That's why we need ``multi_block``.
* It's also different that stop transmission token is not needed in the SDIO mode.
*/
static esp_err_t start_command_write_blocks(slot_info_t *slot, sdspi_hw_cmd_t *cmd,
const uint8_t *data, uint32_t tx_length, bool multi_block, bool stop_trans)
{
if (card_write_protected(slot)) {
ESP_LOGW(TAG, "%s: card write protected", __func__);
return ESP_ERR_INVALID_STATE;
}
// Send the minimum length that is sure to get the complete response
// SD cards always return R1 (1bytes), SDIO returns R5 (2 bytes)
const int send_bytes = SDSPI_CMD_R5_SIZE + SDSPI_NCR_MAX_SIZE - SDSPI_NCR_MIN_SIZE;
spi_transaction_t t_command = {
.length = send_bytes * 8,
.tx_buffer = cmd,
.rx_buffer = cmd,
};
esp_err_t ret = spi_device_polling_transmit(slot->spi_handle, &t_command);
if (ret != ESP_OK) {
return ret;
}
// check if command response valid
ret = shift_cmd_response(cmd, send_bytes);
if (ret != ESP_OK) {
ESP_LOGD(TAG, "%s: check_cmd_response returned 0x%x", __func__, ret);
return ret;
}
uint8_t start_token = multi_block ?
TOKEN_BLOCK_START_WRITE_MULTI : TOKEN_BLOCK_START;
while (tx_length > 0) {
// Write block start token
spi_transaction_t t_start_token = {
.length = sizeof(start_token) * 8,
.tx_buffer = &start_token
};
ret = spi_device_polling_transmit(slot->spi_handle, &t_start_token);
if (ret != ESP_OK) {
return ret;
}
// Prepare data to be sent
size_t will_send = MIN(tx_length, SDSPI_MAX_DATA_LEN);
const uint8_t* tx_data = data;
if (!esp_ptr_in_dram(tx_data)) {
// If the pointer can't be used with DMA, copy data into a new buffer
uint8_t* tmp;
ret = get_block_buf(slot, &tmp);
if (ret != ESP_OK) {
return ret;
}
memcpy(tmp, tx_data, will_send);
tx_data = tmp;
}
// Write data
spi_transaction_t t_data = {
.length = will_send * 8,
.tx_buffer = tx_data,
};
ret = spi_device_transmit(slot->spi_handle, &t_data);
if (ret != ESP_OK) {
return ret;
}
// Write CRC and get the response in one transaction
uint16_t crc = sdspi_crc16(data, will_send);
const int size_crc_response = sizeof(crc) + 1;
spi_transaction_t t_crc_rsp = {
.length = size_crc_response * 8,
.flags = SPI_TRANS_USE_TXDATA | SPI_TRANS_USE_RXDATA,
};
memset(t_crc_rsp.tx_data, 0xff, 4);
memcpy(t_crc_rsp.tx_data, &crc, sizeof(crc));
ret = spi_device_polling_transmit(slot->spi_handle, &t_crc_rsp);
if (ret != ESP_OK) {
return ret;
}
uint8_t data_rsp = t_crc_rsp.rx_data[2];
if (!SD_SPI_DATA_RSP_VALID(data_rsp)) {
return ESP_ERR_INVALID_RESPONSE;
}
switch (SD_SPI_DATA_RSP(data_rsp)) {
case SD_SPI_DATA_ACCEPTED:
break;
case SD_SPI_DATA_CRC_ERROR:
return ESP_ERR_INVALID_CRC;
case SD_SPI_DATA_WR_ERROR:
return ESP_FAIL;
default:
return ESP_ERR_INVALID_RESPONSE;
}
// Wait for the card to finish writing data
ret = poll_busy(slot, cmd->timeout_ms, no_use_polling);
if (ret != ESP_OK) {
return ret;
}
tx_length -= will_send;
data += will_send;
}
if (stop_trans) {
uint8_t stop_token[2] = {
TOKEN_BLOCK_STOP_WRITE_MULTI,
SDSPI_MOSI_IDLE_VAL
};
spi_transaction_t t_stop_token = {
.length = sizeof(stop_token) * 8,
.tx_buffer = &stop_token,
};
ret = spi_device_polling_transmit(slot->spi_handle, &t_stop_token);
if (ret != ESP_OK) {
return ret;
}
ret = poll_busy(slot, cmd->timeout_ms, use_polling);
if (ret != ESP_OK) {
return ret;
}
}
return ESP_OK;
}
esp_err_t sdspi_host_io_int_enable(sdspi_dev_handle_t handle)
{
//the pin and its interrupt is already initialized, nothing to do here.
return ESP_OK;
}
//the interrupt will give the semaphore and then disable itself
esp_err_t sdspi_host_io_int_wait(sdspi_dev_handle_t handle, TickType_t timeout_ticks)
{
slot_info_t* slot = get_slot_info(handle);
//skip the interrupt and semaphore if the gpio is already low.
if (gpio_get_level(slot->gpio_int) == 0) {
return ESP_OK;
}
//clear the semaphore before wait
xSemaphoreTake(slot->semphr_int, 0);
//enable the interrupt and wait for the semaphore
gpio_intr_enable(slot->gpio_int);
BaseType_t ret = xSemaphoreTake(slot->semphr_int, timeout_ticks);
if (ret == pdFALSE) {
gpio_intr_disable(slot->gpio_int);
return ESP_ERR_TIMEOUT;
}
return ESP_OK;
}
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