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2764ee8caf
esp-idf/components/driver/spi_common.c
morris 16677b0d3c global: make periph enable/disable APIs private 
peripheral enable/disable usually should be managed by driver itself,
so make it as espressif private APIs, not recommended for user to use it
in application code.
However, if user want to re-write the driver or ports to other platform,
this is still possible by including the header in this way:
"esp_private/peripheral_ctrl.h"
2021-11-08 10:37:47 +08:00

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/*
* SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "sdkconfig.h"
#include "driver/spi_master.h"
#include "soc/spi_periph.h"
#include "esp_types.h"
#include "esp_attr.h"
#include "esp_log.h"
#include "esp_err.h"
#include "soc/soc.h"
#include "soc/soc_caps.h"
#include "soc/soc_pins.h"
#include "soc/lldesc.h"
#include "driver/gpio.h"
#include "esp_private/periph_ctrl.h"
#include "esp_heap_caps.h"
#include "driver/spi_common_internal.h"
#include "stdatomic.h"
#include "hal/spi_hal.h"
#include "hal/gpio_hal.h"
#include "esp_rom_gpio.h"
#if CONFIG_IDF_TARGET_ESP32
#include "soc/dport_reg.h"
#endif
#if SOC_GDMA_SUPPORTED
#include "esp_private/gdma.h"
#endif
static const char *SPI_TAG = "spi";
#define SPI_CHECK(a, str, ret_val) do { \
if (!(a)) { \
ESP_LOGE(SPI_TAG,"%s(%d): %s", __FUNCTION__, __LINE__, str); \
return (ret_val); \
} \
} while(0)
#define SPI_CHECK_PIN(pin_num, pin_name, check_output) if (check_output) { \
SPI_CHECK(GPIO_IS_VALID_OUTPUT_GPIO(pin_num), pin_name" not valid", ESP_ERR_INVALID_ARG); \
} else { \
SPI_CHECK(GPIO_IS_VALID_GPIO(pin_num), pin_name" not valid", ESP_ERR_INVALID_ARG); \
}
#define SPI_MAIN_BUS_DEFAULT() { \
.host_id = 0, \
.bus_attr = { \
.tx_dma_chan = 0, \
.rx_dma_chan = 0, \
.max_transfer_sz = SOC_SPI_MAXIMUM_BUFFER_SIZE, \
.dma_desc_num= 0, \
}, \
}
#define FUNC_GPIO PIN_FUNC_GPIO
typedef struct {
int host_id;
spi_destroy_func_t destroy_func;
void* destroy_arg;
spi_bus_attr_t bus_attr;
#if SOC_GDMA_SUPPORTED
gdma_channel_handle_t tx_channel;
gdma_channel_handle_t rx_channel;
#endif
} spicommon_bus_context_t;
//Periph 1 is 'claimed' by SPI flash code.
static atomic_bool spi_periph_claimed[SOC_SPI_PERIPH_NUM] = { ATOMIC_VAR_INIT(true), ATOMIC_VAR_INIT(false),
#if (SOC_SPI_PERIPH_NUM >= 3)
ATOMIC_VAR_INIT(false),
#endif
#if (SOC_SPI_PERIPH_NUM >= 4)
ATOMIC_VAR_INIT(false),
#endif
};
static const char* spi_claiming_func[3] = {NULL, NULL, NULL};
static spicommon_bus_context_t s_mainbus = SPI_MAIN_BUS_DEFAULT();
static spicommon_bus_context_t* bus_ctx[SOC_SPI_PERIPH_NUM] = {&s_mainbus};
#if !SOC_GDMA_SUPPORTED
//Each bit stands for 1 dma channel, BIT(0) should be used for SPI1
static uint8_t spi_dma_chan_enabled = 0;
static portMUX_TYPE spi_dma_spinlock = portMUX_INITIALIZER_UNLOCKED;
#endif //#if !SOC_GDMA_SUPPORTED
static inline bool is_valid_host(spi_host_device_t host)
{
#if (SOC_SPI_PERIPH_NUM == 2)
return host >= SPI1_HOST && host <= SPI2_HOST;
#elif (SOC_SPI_PERIPH_NUM == 3)
return host >= SPI1_HOST && host <= SPI3_HOST;
#endif
}
//----------------------------------------------------------alloc spi periph-------------------------------------------------------//
//Returns true if this peripheral is successfully claimed, false if otherwise.
bool spicommon_periph_claim(spi_host_device_t host, const char* source)
{
bool false_var = false;
bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &false_var, true);
if (ret) {
spi_claiming_func[host] = source;
periph_module_enable(spi_periph_signal[host].module);
} else {
ESP_EARLY_LOGE(SPI_TAG, "SPI%d already claimed by %s.", host+1, spi_claiming_func[host]);
}
return ret;
}
bool spicommon_periph_in_use(spi_host_device_t host)
{
return atomic_load(&spi_periph_claimed[host]);
}
//Returns true if this peripheral is successfully freed, false if otherwise.
bool spicommon_periph_free(spi_host_device_t host)
{
bool true_var = true;
bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &true_var, false);
if (ret) periph_module_disable(spi_periph_signal[host].module);
return ret;
}
int spicommon_irqsource_for_host(spi_host_device_t host)
{
return spi_periph_signal[host].irq;
}
int spicommon_irqdma_source_for_host(spi_host_device_t host)
{
return spi_periph_signal[host].irq_dma;
}
//----------------------------------------------------------alloc dma periph-------------------------------------------------------//
#if !SOC_GDMA_SUPPORTED
static inline periph_module_t get_dma_periph(int dma_chan)
{
assert(dma_chan >= 1 && dma_chan <= SOC_SPI_DMA_CHAN_NUM);
#if CONFIG_IDF_TARGET_ESP32S2
if (dma_chan == 1) {
return PERIPH_SPI2_DMA_MODULE;
} else if (dma_chan == 2) {
return PERIPH_SPI3_DMA_MODULE;
} else {
abort();
}
#elif CONFIG_IDF_TARGET_ESP32
return PERIPH_SPI_DMA_MODULE;
#endif
}
static bool spicommon_dma_chan_claim(int dma_chan, uint32_t *out_actual_dma_chan)
{
bool ret = false;
portENTER_CRITICAL(&spi_dma_spinlock);
bool is_used = (BIT(dma_chan) & spi_dma_chan_enabled);
if (!is_used) {
spi_dma_chan_enabled |= BIT(dma_chan);
periph_module_enable(get_dma_periph(dma_chan));
*out_actual_dma_chan = dma_chan;
ret = true;
}
portEXIT_CRITICAL(&spi_dma_spinlock);
return ret;
}
static void spicommon_connect_spi_and_dma(spi_host_device_t host, int dma_chan)
{
#if CONFIG_IDF_TARGET_ESP32
DPORT_SET_PERI_REG_BITS(DPORT_SPI_DMA_CHAN_SEL_REG, 3, dma_chan, (host * 2));
#elif CONFIG_IDF_TARGET_ESP32S2
//On ESP32S2, each SPI controller has its own DMA channel. So there is no need to connect them.
#endif
}
static esp_err_t spicommon_dma_chan_alloc(spi_host_device_t host_id, spi_dma_chan_t dma_chan, uint32_t *out_actual_tx_dma_chan, uint32_t *out_actual_rx_dma_chan)
{
assert(is_valid_host(host_id));
#if CONFIG_IDF_TARGET_ESP32
assert(dma_chan > SPI_DMA_DISABLED && dma_chan <= SPI_DMA_CH_AUTO);
#elif CONFIG_IDF_TARGET_ESP32S2
assert(dma_chan == (int)host_id || dma_chan == SPI_DMA_CH_AUTO);
#endif
esp_err_t ret = ESP_OK;
bool success = false;
uint32_t actual_dma_chan = 0;
if (dma_chan == SPI_DMA_CH_AUTO) {
#if CONFIG_IDF_TARGET_ESP32
for (int i = 1; i < SOC_SPI_DMA_CHAN_NUM+1; i++) {
success = spicommon_dma_chan_claim(i, &actual_dma_chan);
if (success) {
break;
}
}
#elif CONFIG_IDF_TARGET_ESP32S2
//On ESP32S2, each SPI controller has its own DMA channel
success = spicommon_dma_chan_claim(host_id, &actual_dma_chan);
#endif //#if CONFIG_IDF_TARGET_XXX
} else {
success = spicommon_dma_chan_claim((int)dma_chan, &actual_dma_chan);
}
//On ESP32 and ESP32S2, actual_tx_dma_chan and actual_rx_dma_chan are always same
*out_actual_tx_dma_chan = actual_dma_chan;
*out_actual_rx_dma_chan = actual_dma_chan;
if (!success) {
SPI_CHECK(false, "no available dma channel", ESP_ERR_NOT_FOUND);
}
spicommon_connect_spi_and_dma(host_id, *out_actual_tx_dma_chan);
return ret;
}
#else //SOC_GDMA_SUPPORTED
static esp_err_t spicommon_dma_chan_alloc(spi_host_device_t host_id, spi_dma_chan_t dma_chan, uint32_t *out_actual_tx_dma_chan, uint32_t *out_actual_rx_dma_chan)
{
assert(is_valid_host(host_id));
assert(dma_chan == SPI_DMA_CH_AUTO);
esp_err_t ret = ESP_OK;
spicommon_bus_context_t *ctx = bus_ctx[host_id];
if (dma_chan == SPI_DMA_CH_AUTO) {
gdma_channel_alloc_config_t tx_alloc_config = {
.flags.reserve_sibling = 1,
.direction = GDMA_CHANNEL_DIRECTION_TX,
};
ret = gdma_new_channel(&tx_alloc_config, &ctx->tx_channel);
if (ret != ESP_OK) {
return ret;
}
gdma_channel_alloc_config_t rx_alloc_config = {
.direction = GDMA_CHANNEL_DIRECTION_RX,
.sibling_chan = ctx->tx_channel,
};
ret = gdma_new_channel(&rx_alloc_config, &ctx->rx_channel);
if (ret != ESP_OK) {
return ret;
}
if (host_id == SPI2_HOST) {
gdma_connect(ctx->rx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 2));
gdma_connect(ctx->tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 2));
}
#if (SOC_SPI_PERIPH_NUM >= 3)
else if (host_id == SPI3_HOST) {
gdma_connect(ctx->rx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 3));
gdma_connect(ctx->tx_channel, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 3));
}
#endif
gdma_get_channel_id(ctx->tx_channel, (int *)out_actual_tx_dma_chan);
gdma_get_channel_id(ctx->rx_channel, (int *)out_actual_rx_dma_chan);
}
return ret;
}
#endif //#if !SOC_GDMA_SUPPORTED
esp_err_t spicommon_slave_dma_chan_alloc(spi_host_device_t host_id, spi_dma_chan_t dma_chan, uint32_t *out_actual_tx_dma_chan, uint32_t *out_actual_rx_dma_chan)
{
assert(is_valid_host(host_id));
#if CONFIG_IDF_TARGET_ESP32
assert(dma_chan > SPI_DMA_DISABLED && dma_chan <= SPI_DMA_CH_AUTO);
#elif CONFIG_IDF_TARGET_ESP32S2
assert(dma_chan == (int)host_id || dma_chan == SPI_DMA_CH_AUTO);
#endif
esp_err_t ret = ESP_OK;
uint32_t actual_tx_dma_chan = 0;
uint32_t actual_rx_dma_chan = 0;
spicommon_bus_context_t *ctx = (spicommon_bus_context_t *)calloc(1, sizeof(spicommon_bus_context_t));
if (!ctx) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
bus_ctx[host_id] = ctx;
ctx->host_id = host_id;
ret = spicommon_dma_chan_alloc(host_id, dma_chan, &actual_tx_dma_chan, &actual_rx_dma_chan);
if (ret != ESP_OK) {
goto cleanup;
}
ctx->bus_attr.tx_dma_chan = actual_tx_dma_chan;
ctx->bus_attr.rx_dma_chan = actual_rx_dma_chan;
*out_actual_tx_dma_chan = actual_tx_dma_chan;
*out_actual_rx_dma_chan = actual_rx_dma_chan;
return ret;
cleanup:
free(ctx);
ctx = NULL;
return ret;
}
//----------------------------------------------------------free dma periph-------------------------------------------------------//
static esp_err_t spicommon_dma_chan_free(spi_host_device_t host_id)
{
assert(is_valid_host(host_id));
spicommon_bus_context_t *ctx = bus_ctx[host_id];
#if !SOC_GDMA_SUPPORTED
//On ESP32S2, each SPI controller has its own DMA channel
int dma_chan = ctx->bus_attr.tx_dma_chan;
assert(spi_dma_chan_enabled & BIT(dma_chan));
portENTER_CRITICAL(&spi_dma_spinlock);
spi_dma_chan_enabled &= ~BIT(dma_chan);
periph_module_disable(get_dma_periph(dma_chan));
portEXIT_CRITICAL(&spi_dma_spinlock);
#else //SOC_GDMA_SUPPORTED
if (ctx->rx_channel) {
gdma_disconnect(ctx->rx_channel);
gdma_del_channel(ctx->rx_channel);
}
if (ctx->tx_channel) {
gdma_disconnect(ctx->tx_channel);
gdma_del_channel(ctx->tx_channel);
}
#endif
return ESP_OK;
}
esp_err_t spicommon_slave_free_dma(spi_host_device_t host_id)
{
assert(is_valid_host(host_id));
esp_err_t ret = spicommon_dma_chan_free(host_id);
free(bus_ctx[host_id]);
bus_ctx[host_id] = NULL;
return ret;
}
//----------------------------------------------------------IO general-------------------------------------------------------//
#if SOC_SPI_SUPPORT_OCT
static bool check_iomux_pins_oct(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
if (host != SPI2_HOST) {
return false;
}
int io_nums[] = {bus_config->data0_io_num, bus_config->data1_io_num, bus_config->data2_io_num, bus_config->data3_io_num,
bus_config->sclk_io_num, bus_config->data4_io_num, bus_config->data5_io_num, bus_config->data6_io_num, bus_config->data7_io_num};
int io_mux_nums[] = {SPI2_IOMUX_PIN_NUM_MOSI_OCT, SPI2_IOMUX_PIN_NUM_MISO_OCT, SPI2_IOMUX_PIN_NUM_WP_OCT, SPI2_IOMUX_PIN_NUM_HD_OCT,
SPI2_IOMUX_PIN_NUM_CLK_OCT, SPI2_IOMUX_PIN_NUM_IO4_OCT, SPI2_IOMUX_PIN_NUM_IO5_OCT, SPI2_IOMUX_PIN_NUM_IO6_OCT, SPI2_IOMUX_PIN_NUM_IO7_OCT};
for (size_t i = 0; i < sizeof(io_nums)/sizeof(io_nums[0]); i++) {
if (io_nums[i] >= 0 && io_nums[i] != io_mux_nums[i]) {
return false;
}
}
return true;
}
#endif
static bool check_iomux_pins_quad(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
if (bus_config->sclk_io_num>=0 &&
bus_config->sclk_io_num != spi_periph_signal[host].spiclk_iomux_pin) {
return false;
}
if (bus_config->quadwp_io_num>=0 &&
bus_config->quadwp_io_num != spi_periph_signal[host].spiwp_iomux_pin) {
return false;
}
if (bus_config->quadhd_io_num>=0 &&
bus_config->quadhd_io_num != spi_periph_signal[host].spihd_iomux_pin) {
return false;
}
if (bus_config->mosi_io_num >= 0 &&
bus_config->mosi_io_num != spi_periph_signal[host].spid_iomux_pin) {
return false;
}
if (bus_config->miso_io_num>=0 &&
bus_config->miso_io_num != spi_periph_signal[host].spiq_iomux_pin) {
return false;
}
return true;
}
static bool bus_uses_iomux_pins(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
//Check if SPI pins could be routed to iomux.
#if SOC_SPI_SUPPORT_OCT
//The io mux pins available for Octal mode is not the same as the ones we use for non-Octal mode.
if ((bus_config->flags & SPICOMMON_BUSFLAG_OCTAL) == SPICOMMON_BUSFLAG_OCTAL) {
return check_iomux_pins_oct(host, bus_config);
}
#endif
return check_iomux_pins_quad(host, bus_config);
}
#if SOC_SPI_SUPPORT_OCT
static void bus_iomux_pins_set_oct(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
assert(host == SPI2_HOST);
int io_nums[] = {bus_config->data0_io_num, bus_config->data1_io_num, bus_config->data2_io_num, bus_config->data3_io_num,
bus_config->sclk_io_num, bus_config->data4_io_num, bus_config->data5_io_num, bus_config->data6_io_num, bus_config->data7_io_num};
int io_signals[] = {spi_periph_signal[host].spid_in, spi_periph_signal[host].spiq_in, spi_periph_signal[host].spiwp_in,
spi_periph_signal[host].spihd_in,spi_periph_signal[host].spiclk_in, spi_periph_signal[host].spid4_out,
spi_periph_signal[host].spid5_out, spi_periph_signal[host].spid6_out, spi_periph_signal[host].spid7_out};
for (size_t i = 0; i < sizeof(io_nums)/sizeof(io_nums[0]); i++) {
if (io_nums[i] > 0) {
gpio_iomux_in(io_nums[i], io_signals[i]);
// In Octal mode use function channel 2
gpio_iomux_out(io_nums[i], SPI2_FUNC_NUM_OCT, false);
}
}
}
#endif //SOC_SPI_SUPPORT_OCT
static void bus_iomux_pins_set_quad(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
if (bus_config->mosi_io_num >= 0) {
gpio_iomux_in(bus_config->mosi_io_num, spi_periph_signal[host].spid_in);
gpio_iomux_out(bus_config->mosi_io_num, spi_periph_signal[host].func, false);
}
if (bus_config->miso_io_num >= 0) {
gpio_iomux_in(bus_config->miso_io_num, spi_periph_signal[host].spiq_in);
gpio_iomux_out(bus_config->miso_io_num, spi_periph_signal[host].func, false);
}
if (bus_config->quadwp_io_num >= 0) {
gpio_iomux_in(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_in);
gpio_iomux_out(bus_config->quadwp_io_num, spi_periph_signal[host].func, false);
}
if (bus_config->quadhd_io_num >= 0) {
gpio_iomux_in(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_in);
gpio_iomux_out(bus_config->quadhd_io_num, spi_periph_signal[host].func, false);
}
if (bus_config->sclk_io_num >= 0) {
gpio_iomux_in(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_in);
gpio_iomux_out(bus_config->sclk_io_num, spi_periph_signal[host].func, false);
}
}
static void bus_iomux_pins_set(spi_host_device_t host, const spi_bus_config_t* bus_config)
{
#if SOC_SPI_SUPPORT_OCT
if ((bus_config->flags & SPICOMMON_BUSFLAG_OCTAL) == SPICOMMON_BUSFLAG_OCTAL) {
bus_iomux_pins_set_oct(host, bus_config);
return;
}
#endif
bus_iomux_pins_set_quad(host, bus_config);
}
/*
Do the common stuff to hook up a SPI host to a bus defined by a bunch of GPIO pins. Feed it a host number and a
bus config struct and it'll set up the GPIO matrix and enable the device. If a pin is set to non-negative value,
it should be able to be initialized.
*/
esp_err_t spicommon_bus_initialize_io(spi_host_device_t host, const spi_bus_config_t *bus_config, uint32_t flags, uint32_t* flags_o)
{
#if SOC_SPI_SUPPORT_OCT
// In the driver of previous version, spi data4 ~ spi data7 are not in spi_bus_config_t struct. So the new-added pins come as 0
// if they are not really set. Add this boolean variable to check if the user has set spi data4 ~spi data7 pins .
bool io4_7_is_blank = !bus_config->data4_io_num && !bus_config->data5_io_num && !bus_config->data6_io_num && !bus_config->data7_io_num;
// This boolean variable specifies if user sets pins used for octal mode (users can set spi data4 ~ spi data7 to -1).
bool io4_7_enabled = !io4_7_is_blank && bus_config->data4_io_num >= 0 && bus_config->data5_io_num >= 0 &&
bus_config->data6_io_num >= 0 && bus_config->data7_io_num >= 0;
SPI_CHECK((flags & SPICOMMON_BUSFLAG_MASTER) || !((flags & SPICOMMON_BUSFLAG_OCTAL) == SPICOMMON_BUSFLAG_OCTAL), "Octal SPI mode / OPI mode only works when SPI is used as Master", ESP_ERR_INVALID_ARG);
SPI_CHECK(host == SPI2_HOST || !((flags & SPICOMMON_BUSFLAG_OCTAL) == SPICOMMON_BUSFLAG_OCTAL), "Only SPI2 supports Octal SPI mode / OPI mode", ESP_ERR_INVALID_ARG);
#endif //SOC_SPI_SUPPORT_OCT
uint32_t temp_flag = 0;
bool miso_need_output;
bool mosi_need_output;
bool sclk_need_output;
if ((flags&SPICOMMON_BUSFLAG_MASTER) != 0) {
//initial for master
miso_need_output = ((flags&SPICOMMON_BUSFLAG_DUAL) != 0) ? true : false;
mosi_need_output = true;
sclk_need_output = true;
} else {
//initial for slave
miso_need_output = true;
mosi_need_output = ((flags&SPICOMMON_BUSFLAG_DUAL) != 0) ? true : false;
sclk_need_output = false;
}
const bool wp_need_output = true;
const bool hd_need_output = true;
//check pin capabilities
if (bus_config->sclk_io_num>=0) {
temp_flag |= SPICOMMON_BUSFLAG_SCLK;
SPI_CHECK_PIN(bus_config->sclk_io_num, "sclk", sclk_need_output);
}
if (bus_config->quadwp_io_num>=0) {
SPI_CHECK_PIN(bus_config->quadwp_io_num, "wp", wp_need_output);
}
if (bus_config->quadhd_io_num>=0) {
SPI_CHECK_PIN(bus_config->quadhd_io_num, "hd", hd_need_output);
}
#if SOC_SPI_SUPPORT_OCT
const bool io4_need_output = true;
const bool io5_need_output = true;
const bool io6_need_output = true;
const bool io7_need_output = true;
// set flags for OCTAL mode according to the existence of spi data4 ~ spi data7
if (io4_7_enabled) {
temp_flag |= SPICOMMON_BUSFLAG_IO4_IO7;
if (bus_config->data4_io_num >= 0) {
SPI_CHECK_PIN(bus_config->data4_io_num, "spi data4", io4_need_output);
}
if (bus_config->data5_io_num >= 0) {
SPI_CHECK_PIN(bus_config->data5_io_num, "spi data5", io5_need_output);
}
if (bus_config->data6_io_num >= 0) {
SPI_CHECK_PIN(bus_config->data6_io_num, "spi data6", io6_need_output);
}
if (bus_config->data7_io_num >= 0) {
SPI_CHECK_PIN(bus_config->data7_io_num, "spi data7", io7_need_output);
}
}
#endif //SOC_SPI_SUPPORT_OCT
//set flags for QUAD mode according to the existence of wp and hd
if (bus_config->quadhd_io_num >= 0 && bus_config->quadwp_io_num >= 0) temp_flag |= SPICOMMON_BUSFLAG_WPHD;
if (bus_config->mosi_io_num >= 0) {
temp_flag |= SPICOMMON_BUSFLAG_MOSI;
SPI_CHECK_PIN(bus_config->mosi_io_num, "mosi", mosi_need_output);
}
if (bus_config->miso_io_num >= 0) {
temp_flag |= SPICOMMON_BUSFLAG_MISO;
SPI_CHECK_PIN(bus_config->miso_io_num, "miso", miso_need_output);
}
//set flags for DUAL mode according to output-capability of MOSI and MISO pins.
if ( (bus_config->mosi_io_num < 0 || GPIO_IS_VALID_OUTPUT_GPIO(bus_config->mosi_io_num)) &&
(bus_config->miso_io_num < 0 || GPIO_IS_VALID_OUTPUT_GPIO(bus_config->miso_io_num)) ) {
temp_flag |= SPICOMMON_BUSFLAG_DUAL;
}
//check if the selected pins correspond to the iomux pins of the peripheral
bool use_iomux = !(flags & SPICOMMON_BUSFLAG_GPIO_PINS) && bus_uses_iomux_pins(host, bus_config);
if (use_iomux) {
temp_flag |= SPICOMMON_BUSFLAG_IOMUX_PINS;
} else {
temp_flag |= SPICOMMON_BUSFLAG_GPIO_PINS;
}
uint32_t missing_flag = flags & ~temp_flag;
missing_flag &= ~SPICOMMON_BUSFLAG_MASTER;//don't check this flag
if (missing_flag != 0) {
//check pins existence
if (missing_flag & SPICOMMON_BUSFLAG_SCLK) {
ESP_LOGE(SPI_TAG, "sclk pin required.");
}
if (missing_flag & SPICOMMON_BUSFLAG_MOSI) {
ESP_LOGE(SPI_TAG, "mosi pin required.");
}
if (missing_flag & SPICOMMON_BUSFLAG_MISO) {
ESP_LOGE(SPI_TAG, "miso pin required.");
}
if (missing_flag & SPICOMMON_BUSFLAG_DUAL) {
ESP_LOGE(SPI_TAG, "not both mosi and miso output capable");
}
if (missing_flag & SPICOMMON_BUSFLAG_WPHD) {
ESP_LOGE(SPI_TAG, "both wp and hd required.");
}
if (missing_flag & SPICOMMON_BUSFLAG_IOMUX_PINS) {
ESP_LOGE(SPI_TAG, "not using iomux pins");
}
#if SOC_SPI_SUPPORT_OCT
if (missing_flag & SPICOMMON_BUSFLAG_IO4_IO7) {
ESP_LOGE(SPI_TAG, "spi data4 ~ spi data7 are required.");
}
#endif
SPI_CHECK(missing_flag == 0, "not all required capabilities satisfied.", ESP_ERR_INVALID_ARG);
}
if (use_iomux) {
//All SPI iomux pin selections resolve to 1, so we put that here instead of trying to figure
//out which FUNC_GPIOx_xSPIxx to grab; they all are defined to 1 anyway.
ESP_LOGD(SPI_TAG, "SPI%d use iomux pins.", host+1);
bus_iomux_pins_set(host, bus_config);
} else {
//Use GPIO matrix
ESP_LOGD(SPI_TAG, "SPI%d use gpio matrix.", host+1);
if (bus_config->mosi_io_num >= 0) {
if (mosi_need_output || (temp_flag&SPICOMMON_BUSFLAG_DUAL)) {
gpio_set_direction(bus_config->mosi_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(bus_config->mosi_io_num, spi_periph_signal[host].spid_out, false, false);
} else {
gpio_set_direction(bus_config->mosi_io_num, GPIO_MODE_INPUT);
}
esp_rom_gpio_connect_in_signal(bus_config->mosi_io_num, spi_periph_signal[host].spid_in, false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->mosi_io_num]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[bus_config->mosi_io_num], FUNC_GPIO);
}
if (bus_config->miso_io_num >= 0) {
if (miso_need_output || (temp_flag&SPICOMMON_BUSFLAG_DUAL)) {
gpio_set_direction(bus_config->miso_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(bus_config->miso_io_num, spi_periph_signal[host].spiq_out, false, false);
} else {
gpio_set_direction(bus_config->miso_io_num, GPIO_MODE_INPUT);
}
esp_rom_gpio_connect_in_signal(bus_config->miso_io_num, spi_periph_signal[host].spiq_in, false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->miso_io_num]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[bus_config->miso_io_num], FUNC_GPIO);
}
if (bus_config->quadwp_io_num >= 0) {
gpio_set_direction(bus_config->quadwp_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_out, false, false);
esp_rom_gpio_connect_in_signal(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_in, false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->quadwp_io_num]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[bus_config->quadwp_io_num], FUNC_GPIO);
}
if (bus_config->quadhd_io_num >= 0) {
gpio_set_direction(bus_config->quadhd_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_out, false, false);
esp_rom_gpio_connect_in_signal(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_in, false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->quadhd_io_num]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[bus_config->quadhd_io_num], FUNC_GPIO);
}
if (bus_config->sclk_io_num >= 0) {
if (sclk_need_output) {
gpio_set_direction(bus_config->sclk_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_out, false, false);
} else {
gpio_set_direction(bus_config->sclk_io_num, GPIO_MODE_INPUT);
}
esp_rom_gpio_connect_in_signal(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_in, false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->sclk_io_num]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[bus_config->sclk_io_num], FUNC_GPIO);
}
#if SOC_SPI_SUPPORT_OCT
if (flags & SPICOMMON_BUSFLAG_OCTAL) {
int io_nums[] = {bus_config->data4_io_num, bus_config->data5_io_num, bus_config->data6_io_num, bus_config->data7_io_num};
uint8_t io_signals[4][2] = {{spi_periph_signal[host].spid4_out, spi_periph_signal[host].spid4_in},
{spi_periph_signal[host].spid5_out, spi_periph_signal[host].spid5_in},
{spi_periph_signal[host].spid6_out, spi_periph_signal[host].spid6_in},
{spi_periph_signal[host].spid7_out, spi_periph_signal[host].spid7_in}};
for (size_t i = 0; i < sizeof(io_nums) / sizeof(io_nums[0]); i++) {
if (io_nums[i] >= 0) {
gpio_set_direction(io_nums[i], GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(io_nums[i], io_signals[i][0], false, false);
esp_rom_gpio_connect_in_signal(io_nums[i], io_signals[i][1], false);
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[io_nums[i]]);
#endif
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[io_nums[i]], FUNC_GPIO);
}
}
}
#endif //SOC_SPI_SUPPORT_OCT
}
if (flags_o) *flags_o = temp_flag;
return ESP_OK;
}
esp_err_t spicommon_bus_free_io_cfg(const spi_bus_config_t *bus_cfg)
{
int pin_array[] = {
bus_cfg->mosi_io_num,
bus_cfg->miso_io_num,
bus_cfg->sclk_io_num,
bus_cfg->quadwp_io_num,
bus_cfg->quadhd_io_num,
};
for (int i = 0; i < sizeof(pin_array)/sizeof(int); i ++) {
const int io = pin_array[i];
if (io >= 0 && GPIO_IS_VALID_GPIO(io)) gpio_reset_pin(io);
}
return ESP_OK;
}
void spicommon_cs_initialize(spi_host_device_t host, int cs_io_num, int cs_num, int force_gpio_matrix)
{
if (!force_gpio_matrix && cs_io_num == spi_periph_signal[host].spics0_iomux_pin && cs_num == 0) {
//The cs0s for all SPI peripherals map to pin mux source 1, so we use that instead of a define.
gpio_iomux_in(cs_io_num, spi_periph_signal[host].spics_in);
gpio_iomux_out(cs_io_num, spi_periph_signal[host].func, false);
} else {
//Use GPIO matrix
if (GPIO_IS_VALID_OUTPUT_GPIO(cs_io_num)) {
gpio_set_direction(cs_io_num, GPIO_MODE_INPUT_OUTPUT);
esp_rom_gpio_connect_out_signal(cs_io_num, spi_periph_signal[host].spics_out[cs_num], false, false);
} else {
gpio_set_direction(cs_io_num, GPIO_MODE_INPUT);
}
if (cs_num == 0) esp_rom_gpio_connect_in_signal(cs_io_num, spi_periph_signal[host].spics_in, false);
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[cs_io_num]);
gpio_hal_iomux_func_sel(GPIO_PIN_MUX_REG[cs_io_num], FUNC_GPIO);
}
}
void spicommon_cs_free_io(int cs_gpio_num)
{
assert(cs_gpio_num>=0 && GPIO_IS_VALID_GPIO(cs_gpio_num));
gpio_reset_pin(cs_gpio_num);
}
bool spicommon_bus_using_iomux(spi_host_device_t host)
{
#define CHECK_IOMUX_PIN(HOST, PIN_NAME) if (GPIO.func_in_sel_cfg[spi_periph_signal[(HOST)].PIN_NAME##_in].sig_in_sel) return false
CHECK_IOMUX_PIN(host, spid);
CHECK_IOMUX_PIN(host, spiq);
CHECK_IOMUX_PIN(host, spiwp);
CHECK_IOMUX_PIN(host, spihd);
return true;
}
void spi_bus_main_set_lock(spi_bus_lock_handle_t lock)
{
bus_ctx[0]->bus_attr.lock = lock;
}
spi_bus_lock_handle_t spi_bus_lock_get_by_id(spi_host_device_t host_id)
{
return bus_ctx[host_id]->bus_attr.lock;
}
//----------------------------------------------------------master bus init-------------------------------------------------------//
esp_err_t spi_bus_initialize(spi_host_device_t host_id, const spi_bus_config_t *bus_config, spi_dma_chan_t dma_chan)
{
esp_err_t err = ESP_OK;
spicommon_bus_context_t *ctx = NULL;
spi_bus_attr_t *bus_attr = NULL;
uint32_t actual_tx_dma_chan = 0;
uint32_t actual_rx_dma_chan = 0;
SPI_CHECK(is_valid_host(host_id), "invalid host_id", ESP_ERR_INVALID_ARG);
SPI_CHECK(bus_ctx[host_id] == NULL, "SPI bus already initialized.", ESP_ERR_INVALID_STATE);
#ifdef CONFIG_IDF_TARGET_ESP32
SPI_CHECK(dma_chan >= SPI_DMA_DISABLED && dma_chan <= SPI_DMA_CH_AUTO, "invalid dma channel", ESP_ERR_INVALID_ARG );
#elif CONFIG_IDF_TARGET_ESP32S2
SPI_CHECK( dma_chan == SPI_DMA_DISABLED || dma_chan == (int)host_id || dma_chan == SPI_DMA_CH_AUTO, "invalid dma channel", ESP_ERR_INVALID_ARG );
#elif SOC_GDMA_SUPPORTED
SPI_CHECK( dma_chan == SPI_DMA_DISABLED || dma_chan == SPI_DMA_CH_AUTO, "invalid dma channel, chip only support spi dma channel auto-alloc", ESP_ERR_INVALID_ARG );
#endif
SPI_CHECK((bus_config->intr_flags & (ESP_INTR_FLAG_HIGH|ESP_INTR_FLAG_EDGE|ESP_INTR_FLAG_INTRDISABLED))==0, "intr flag not allowed", ESP_ERR_INVALID_ARG);
#ifndef CONFIG_SPI_MASTER_ISR_IN_IRAM
SPI_CHECK((bus_config->intr_flags & ESP_INTR_FLAG_IRAM)==0, "ESP_INTR_FLAG_IRAM should be disabled when CONFIG_SPI_MASTER_ISR_IN_IRAM is not set.", ESP_ERR_INVALID_ARG);
#endif
bool spi_chan_claimed = spicommon_periph_claim(host_id, "spi master");
SPI_CHECK(spi_chan_claimed, "host_id already in use", ESP_ERR_INVALID_STATE);
//clean and initialize the context
ctx = (spicommon_bus_context_t *)calloc(1, sizeof(spicommon_bus_context_t));
if (!ctx) {
err = ESP_ERR_NO_MEM;
goto cleanup;
}
bus_ctx[host_id] = ctx;
ctx->host_id = host_id;
bus_attr = &ctx->bus_attr;
bus_attr->bus_cfg = *bus_config;
if (dma_chan != SPI_DMA_DISABLED) {
bus_attr->dma_enabled = 1;
err = spicommon_dma_chan_alloc(host_id, dma_chan, &actual_tx_dma_chan, &actual_rx_dma_chan);
if (err != ESP_OK) {
goto cleanup;
}
bus_attr->tx_dma_chan = actual_tx_dma_chan;
bus_attr->rx_dma_chan = actual_rx_dma_chan;
int dma_desc_ct = lldesc_get_required_num(bus_config->max_transfer_sz);
if (dma_desc_ct == 0) dma_desc_ct = 1; //default to 4k when max is not given
bus_attr->max_transfer_sz = dma_desc_ct * LLDESC_MAX_NUM_PER_DESC;
bus_attr->dmadesc_tx = heap_caps_malloc(sizeof(lldesc_t) * dma_desc_ct, MALLOC_CAP_DMA);
bus_attr->dmadesc_rx = heap_caps_malloc(sizeof(lldesc_t) * dma_desc_ct, MALLOC_CAP_DMA);
if (bus_attr->dmadesc_tx == NULL || bus_attr->dmadesc_rx == NULL) {
err = ESP_ERR_NO_MEM;
goto cleanup;
}
bus_attr->dma_desc_num = dma_desc_ct;
} else {
bus_attr->dma_enabled = 0;
bus_attr->max_transfer_sz = SOC_SPI_MAXIMUM_BUFFER_SIZE;
bus_attr->dma_desc_num = 0;
}
spi_bus_lock_config_t lock_config = {
.host_id = host_id,
.cs_num = SOC_SPI_PERIPH_CS_NUM(host_id),
};
err = spi_bus_init_lock(&bus_attr->lock, &lock_config);
if (err != ESP_OK) {
goto cleanup;
}
#ifdef CONFIG_PM_ENABLE
err = esp_pm_lock_create(ESP_PM_APB_FREQ_MAX, 0, "spi_master",
&bus_attr->pm_lock);
if (err != ESP_OK) {
goto cleanup;
}
#endif //CONFIG_PM_ENABLE
err = spicommon_bus_initialize_io(host_id, bus_config, SPICOMMON_BUSFLAG_MASTER | bus_config->flags, &bus_attr->flags);
if (err != ESP_OK) {
goto cleanup;
}
return ESP_OK;
cleanup:
if (bus_attr) {
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_delete(bus_attr->pm_lock);
#endif
if (bus_attr->lock) {
spi_bus_deinit_lock(bus_attr->lock);
}
free(bus_attr->dmadesc_tx);
free(bus_attr->dmadesc_rx);
bus_attr->dmadesc_tx = NULL;
bus_attr->dmadesc_rx = NULL;
if (bus_attr->dma_enabled) {
spicommon_dma_chan_free(host_id);
}
}
spicommon_periph_free(host_id);
free(bus_ctx[host_id]);
bus_ctx[host_id] = NULL;
return err;
}
const spi_bus_attr_t* spi_bus_get_attr(spi_host_device_t host_id)
{
if (bus_ctx[host_id] == NULL) return NULL;
return &bus_ctx[host_id]->bus_attr;
}
esp_err_t spi_bus_free(spi_host_device_t host_id)
{
esp_err_t err = ESP_OK;
spicommon_bus_context_t* ctx = bus_ctx[host_id];
spi_bus_attr_t* bus_attr = &ctx->bus_attr;
if (ctx->destroy_func) {
err = ctx->destroy_func(ctx->destroy_arg);
}
spicommon_bus_free_io_cfg(&bus_attr->bus_cfg);
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_delete(bus_attr->pm_lock);
#endif
spi_bus_deinit_lock(bus_attr->lock);
free(bus_attr->dmadesc_rx);
free(bus_attr->dmadesc_tx);
bus_attr->dmadesc_tx = NULL;
bus_attr->dmadesc_rx = NULL;
if (bus_attr->dma_enabled > 0) {
spicommon_dma_chan_free(host_id);
}
spicommon_periph_free(host_id);
free(ctx);
bus_ctx[host_id] = NULL;
return err;
}
esp_err_t spi_bus_register_destroy_func(spi_host_device_t host_id,
spi_destroy_func_t f, void *arg)
{
bus_ctx[host_id]->destroy_func = f;
bus_ctx[host_id]->destroy_arg = arg;
return ESP_OK;
}
/*
Code for workaround for DMA issue in ESP32 v0/v1 silicon
*/
#if CONFIG_IDF_TARGET_ESP32
static volatile int dmaworkaround_channels_busy[2] = {0, 0};
static dmaworkaround_cb_t dmaworkaround_cb;
static void *dmaworkaround_cb_arg;
static portMUX_TYPE dmaworkaround_mux = portMUX_INITIALIZER_UNLOCKED;
static int dmaworkaround_waiting_for_chan = 0;
#endif
bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void *arg)
{
#if CONFIG_IDF_TARGET_ESP32
int otherchan = (dmachan == 1) ? 2 : 1;
bool ret;
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
if (dmaworkaround_channels_busy[otherchan-1]) {
//Other channel is busy. Call back when it's done.
dmaworkaround_cb = cb;
dmaworkaround_cb_arg = arg;
dmaworkaround_waiting_for_chan = otherchan;
ret = false;
} else {
//Reset DMA
periph_module_reset( PERIPH_SPI_DMA_MODULE );
ret = true;
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
return ret;
#else
//no need to reset
return true;
#endif
}
bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress(void)
{
#if CONFIG_IDF_TARGET_ESP32
return (dmaworkaround_waiting_for_chan != 0);
#else
return false;
#endif
}
void IRAM_ATTR spicommon_dmaworkaround_idle(int dmachan)
{
#if CONFIG_IDF_TARGET_ESP32
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan-1] = 0;
if (dmaworkaround_waiting_for_chan == dmachan) {
//Reset DMA
periph_module_reset( PERIPH_SPI_DMA_MODULE );
dmaworkaround_waiting_for_chan = 0;
//Call callback
dmaworkaround_cb(dmaworkaround_cb_arg);
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
#endif
}
void IRAM_ATTR spicommon_dmaworkaround_transfer_active(int dmachan)
{
#if CONFIG_IDF_TARGET_ESP32
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan-1] = 1;
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
#endif
}
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