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/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "sdkconfig.h"
#include "stdatomic.h"
#include "esp_types.h"
#include "esp_attr.h"
#include "esp_check.h"
#include "esp_cache.h"
#include "esp_rom_gpio.h"
#include "esp_heap_caps.h"
#include "soc/spi_periph.h"
#include "driver/spi_master.h"
#include "driver/gpio.h"
#include "esp_private/gpio.h"
#include "esp_private/periph_ctrl.h"
#include "esp_private/spi_common_internal.h"
#include "esp_private/spi_share_hw_ctrl.h"
#include "esp_private/esp_cache_private.h"
#include "esp_private/sleep_retention.h"
#include "esp_dma_utils.h"
#include "hal/spi_hal.h"
#include "hal/gpio_hal.h"
#if CONFIG_IDF_TARGET_ESP32
#include "soc/dport_reg.h"
#endif
static const char *SPI_TAG = "spi";
#define SPI_CHECK(a, str, ret_val) ESP_RETURN_ON_FALSE(a, ret_val, SPI_TAG, str)
#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 = { \
.max_transfer_sz = SOC_SPI_MAXIMUM_BUFFER_SIZE, \
}, \
}
#define FUNC_GPIO PIN_FUNC_GPIO
typedef struct {
int host_id;
_lock_t mutex; // mutex for controller
spi_destroy_func_t destroy_func;
void* destroy_arg;
spi_bus_attr_t bus_attr;
spi_dma_ctx_t *dma_ctx;
#if SOC_GDMA_SUPPORTED
gdma_channel_handle_t tx_channel;
gdma_channel_handle_t rx_channel;
#endif
} spicommon_bus_context_t;
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 CONFIG_SPI_FLASH_SHARE_SPI1_BUS
/* The lock for the share SPI1 bus is registered here in a constructor due to need to access the context
This way we are able to decouple the SPI-flash driver from the spi-master driver */
static __attribute__((constructor)) void spi_bus_lock_init_main_bus(void)
{
/* Initialize bus context about the main SPI bus lock, called during chip startup. */
spi_bus_main_set_lock(g_main_spi_bus_lock);
}
#endif
#if SOC_GDMA_SUPPORTED
//NOTE!! If both A and B are not defined, '#if (A==B)' is true, because GCC use 0 stand for undefined symbol
#if defined(SOC_GDMA_BUS_AXI) && (SOC_GDMA_TRIG_PERIPH_SPI2_BUS == SOC_GDMA_BUS_AXI)
#define SPI_GDMA_NEW_CHANNEL gdma_new_axi_channel
#elif defined(SOC_GDMA_BUS_AHB) && (SOC_GDMA_TRIG_PERIPH_SPI2_BUS == SOC_GDMA_BUS_AHB)
#define SPI_GDMA_NEW_CHANNEL gdma_new_ahb_channel
#endif
#else
//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 //!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
}
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
#if SPI_LL_DMA_SHARED
static inline periph_module_t get_dma_periph(int dma_chan)
{
assert(dma_chan >= 1 && dma_chan <= SOC_SPI_DMA_CHAN_NUM);
if (dma_chan == 1) {
return PERIPH_SPI2_DMA_MODULE;
} else if (dma_chan == 2) {
return PERIPH_SPI3_DMA_MODULE;
} else {
abort();
}
}
#endif
static bool claim_dma_chan(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);
#if SPI_LL_DMA_SHARED
PERIPH_RCC_ACQUIRE_ATOMIC(get_dma_periph(dma_chan), ref_count) {
//esp32s2: dma_chan index is same as spi host_id, no matter dma_chan_auto or not
if (ref_count == 0) {
spi_dma_ll_enable_bus_clock(dma_chan, true);
spi_dma_ll_reset_register(dma_chan);
}
}
#else
SPI_COMMON_RCC_CLOCK_ATOMIC() {
//esp32: have only one spi_dma
spi_dma_ll_enable_bus_clock(dma_chan, true);
spi_dma_ll_reset_register(dma_chan);
}
#endif
*out_actual_dma_chan = dma_chan;
ret = true;
}
portEXIT_CRITICAL(&spi_dma_spinlock);
return ret;
}
static void 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 alloc_dma_chan(spi_host_device_t host_id, spi_dma_chan_t dma_chan, spi_dma_ctx_t *dma_ctx)
{
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 = claim_dma_chan(i, &actual_dma_chan);
if (success) {
break;
}
}
#elif CONFIG_IDF_TARGET_ESP32S2
//On ESP32S2, each SPI controller has its own DMA channel
success = claim_dma_chan(host_id, &actual_dma_chan);
#endif //#if CONFIG_IDF_TARGET_XXX
} else {
success = claim_dma_chan((int)dma_chan, &actual_dma_chan);
}
//On ESP32 and ESP32S2, actual_tx_dma_chan and actual_rx_dma_chan are always same
dma_ctx->tx_dma_chan.chan_id = actual_dma_chan;
dma_ctx->rx_dma_chan.chan_id = actual_dma_chan;
dma_ctx->tx_dma_chan.host_id = host_id;
dma_ctx->rx_dma_chan.host_id = host_id;
dma_ctx->tx_dma_chan.dir = DMA_CHANNEL_DIRECTION_TX;
dma_ctx->rx_dma_chan.dir = DMA_CHANNEL_DIRECTION_RX;
if (!success) {
SPI_CHECK(false, "no available dma channel", ESP_ERR_NOT_FOUND);
}
connect_spi_and_dma(host_id, actual_dma_chan);
spi_dma_enable_burst(dma_ctx->tx_dma_chan, true, true);
spi_dma_enable_burst(dma_ctx->rx_dma_chan, true, true);
return ret;
}
#else //SOC_GDMA_SUPPORTED
static esp_err_t alloc_dma_chan(spi_host_device_t host_id, spi_dma_chan_t dma_chan, spi_dma_ctx_t *dma_ctx)
{
assert(is_valid_host(host_id));
assert(dma_chan == SPI_DMA_CH_AUTO);
esp_err_t ret = ESP_OK;
if (dma_chan == SPI_DMA_CH_AUTO) {
gdma_channel_alloc_config_t tx_alloc_config = {
.flags.reserve_sibling = 1,
.direction = GDMA_CHANNEL_DIRECTION_TX,
};
ESP_RETURN_ON_ERROR(SPI_GDMA_NEW_CHANNEL(&tx_alloc_config, &dma_ctx->tx_dma_chan), SPI_TAG, "alloc gdma tx failed");
gdma_channel_alloc_config_t rx_alloc_config = {
.direction = GDMA_CHANNEL_DIRECTION_RX,
.sibling_chan = dma_ctx->tx_dma_chan,
};
ESP_RETURN_ON_ERROR(SPI_GDMA_NEW_CHANNEL(&rx_alloc_config, &dma_ctx->rx_dma_chan), SPI_TAG, "alloc gdma rx failed");
if (host_id == SPI2_HOST) {
gdma_connect(dma_ctx->tx_dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 2));
gdma_connect(dma_ctx->rx_dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 2));
}
#if (SOC_SPI_PERIPH_NUM >= 3)
else if (host_id == SPI3_HOST) {
gdma_connect(dma_ctx->tx_dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 3));
gdma_connect(dma_ctx->rx_dma_chan, GDMA_MAKE_TRIGGER(GDMA_TRIG_PERIPH_SPI, 3));
}
#endif
// TODO: add support to allow SPI transfer PSRAM buffer
gdma_transfer_config_t trans_cfg = {
.max_data_burst_size = 16,
.access_ext_mem = false,
};
ESP_RETURN_ON_ERROR(gdma_config_transfer(dma_ctx->tx_dma_chan, &trans_cfg), SPI_TAG, "config gdma tx transfer failed");
ESP_RETURN_ON_ERROR(gdma_config_transfer(dma_ctx->rx_dma_chan, &trans_cfg), SPI_TAG, "config gdma rx transfer failed");
}
return ret;
}
#endif //#if !SOC_GDMA_SUPPORTED
esp_err_t spicommon_dma_chan_alloc(spi_host_device_t host_id, spi_dma_chan_t dma_chan, spi_dma_ctx_t **out_dma_ctx)
{
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;
spi_dma_ctx_t *dma_ctx = (spi_dma_ctx_t *)calloc(1, sizeof(spi_dma_ctx_t));
if (!dma_ctx) {
ret = ESP_ERR_NO_MEM;
goto cleanup;
}
ret = alloc_dma_chan(host_id, dma_chan, dma_ctx);
if (ret != ESP_OK) {
goto cleanup;
}
*out_dma_ctx = dma_ctx;
return ret;
cleanup:
free(dma_ctx);
return ret;
}
esp_err_t spicommon_dma_desc_alloc(spi_dma_ctx_t *dma_ctx, int cfg_max_sz, int *actual_max_sz)
{
int dma_desc_ct = (cfg_max_sz + DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED - 1) / DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED;
if (dma_desc_ct == 0) {
dma_desc_ct = 1; //default to 4k when max is not given
}
dma_ctx->dmadesc_tx = heap_caps_aligned_calloc(DMA_DESC_MEM_ALIGN_SIZE, 1, sizeof(spi_dma_desc_t) * dma_desc_ct, MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL);
dma_ctx->dmadesc_rx = heap_caps_aligned_calloc(DMA_DESC_MEM_ALIGN_SIZE, 1, sizeof(spi_dma_desc_t) * dma_desc_ct, MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL);
if (dma_ctx->dmadesc_tx == NULL || dma_ctx->dmadesc_rx == NULL) {
if (dma_ctx->dmadesc_tx) {
free(dma_ctx->dmadesc_tx);
dma_ctx->dmadesc_tx = NULL;
}
if (dma_ctx->dmadesc_rx) {
free(dma_ctx->dmadesc_rx);
dma_ctx->dmadesc_rx = NULL;
}
return ESP_ERR_NO_MEM;
}
dma_ctx->dma_desc_num = dma_desc_ct;
*actual_max_sz = dma_desc_ct * DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED;
return ESP_OK;
}
void IRAM_ATTR spicommon_dma_desc_setup_link(spi_dma_desc_t *dmadesc, const void *data, int len, bool is_rx)
{
dmadesc = ADDR_DMA_2_CPU(dmadesc);
int n = 0;
while (len) {
int dmachunklen = len;
if (dmachunklen > DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED) {
dmachunklen = DMA_DESCRIPTOR_BUFFER_MAX_SIZE_4B_ALIGNED;
}
if (is_rx) {
//Receive needs DMA length rounded to next 32-bit boundary
dmadesc[n].dw0.size = (dmachunklen + 3) & (~3);
} else {
dmadesc[n].dw0.size = dmachunklen;
dmadesc[n].dw0.length = dmachunklen;
}
dmadesc[n].buffer = (uint8_t *)data;
dmadesc[n].dw0.suc_eof = 0;
dmadesc[n].dw0.owner = DMA_DESCRIPTOR_BUFFER_OWNER_DMA;
dmadesc[n].next = ADDR_CPU_2_DMA(&dmadesc[n + 1]);
len -= dmachunklen;
data += dmachunklen;
n++;
}
dmadesc[n - 1].dw0.suc_eof = 1; //Mark last DMA desc as end of stream.
dmadesc[n - 1].next = NULL;
}
//----------------------------------------------------------free dma periph-------------------------------------------------------//
esp_err_t spicommon_dma_chan_free(spi_dma_ctx_t *dma_ctx)
{
assert(dma_ctx);
#if !SOC_GDMA_SUPPORTED
//On ESP32S2, each SPI controller has its own DMA channel
int dma_chan = dma_ctx->tx_dma_chan.chan_id;
assert(spi_dma_chan_enabled & BIT(dma_chan));
portENTER_CRITICAL(&spi_dma_spinlock);
spi_dma_chan_enabled &= ~BIT(dma_chan);
#if SPI_LL_DMA_SHARED
PERIPH_RCC_RELEASE_ATOMIC(get_dma_periph(dma_chan), ref_count) {
if (ref_count == 0) {
spi_dma_ll_enable_bus_clock(dma_ctx->tx_dma_chan.host_id, false);
}
}
#else
SPI_COMMON_RCC_CLOCK_ATOMIC() {
spi_dma_ll_enable_bus_clock(dma_ctx->tx_dma_chan.host_id, false);
}
#endif
portEXIT_CRITICAL(&spi_dma_spinlock);
#else //SOC_GDMA_SUPPORTED
if (dma_ctx->rx_dma_chan) {
gdma_disconnect(dma_ctx->rx_dma_chan);
gdma_del_channel(dma_ctx->rx_dma_chan);
}
if (dma_ctx->tx_dma_chan) {
gdma_disconnect(dma_ctx->tx_dma_chan);
gdma_del_channel(dma_ctx->tx_dma_chan);
}
#endif
free(dma_ctx);
return ESP_OK;
}
//----------------------------------------------------------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
missing_flag &= ~SPICOMMON_BUSFLAG_SLP_ALLOW_PD;
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_func_sel(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_func_sel(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_func_sel(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_func_sel(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_func_sel(bus_config->sclk_io_num, FUNC_GPIO);
}
#if SOC_SPI_SUPPORT_OCT
if ((flags & SPICOMMON_BUSFLAG_OCTAL) == 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_func_sel(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 (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);
}
#if CONFIG_IDF_TARGET_ESP32S2
PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[cs_io_num]);
#endif
gpio_func_sel(cs_io_num, FUNC_GPIO);
}
}
void spicommon_cs_free_io(int cs_gpio_num)
{
assert(GPIO_IS_VALID_GPIO(cs_gpio_num));
gpio_reset_pin(cs_gpio_num);
}
bool spicommon_bus_using_iomux(spi_host_device_t host)
{
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;
}
#if SOC_SPI_SUPPORT_SLEEP_RETENTION && CONFIG_PM_POWER_DOWN_PERIPHERAL_IN_LIGHT_SLEEP
static esp_err_t s_bus_create_sleep_retention_cb(void *arg)
{
spicommon_bus_context_t *ctx = arg;
return sleep_retention_entries_create(spi_reg_retention_info[ctx->host_id - 1].entry_array,
spi_reg_retention_info[ctx->host_id - 1].array_size,
REGDMA_LINK_PRI_GPSPI,
spi_reg_retention_info[ctx->host_id - 1].module_id);
}
#endif // SOC_SPI_SUPPORT_SLEEP_RETENTION
//----------------------------------------------------------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;
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
#if CONFIG_IDF_TARGET_ESP32
SPI_CHECK((bus_config->data_io_default_level == 0), "no support changing io default level ", 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, &ctx->dma_ctx);
if (err != ESP_OK) {
goto cleanup;
}
err = spicommon_dma_desc_alloc(ctx->dma_ctx, bus_config->max_transfer_sz, &bus_attr->max_transfer_sz);
if (err != ESP_OK) {
goto cleanup;
}
#if SOC_CACHE_INTERNAL_MEM_VIA_L1CACHE
esp_cache_get_alignment(MALLOC_CAP_DMA, (size_t *)&bus_attr->internal_mem_align_size);
#else
bus_attr->internal_mem_align_size = 4;
#endif
} else {
bus_attr->dma_enabled = 0;
bus_attr->max_transfer_sz = SOC_SPI_MAXIMUM_BUFFER_SIZE;
}
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;
}
#if SOC_SPI_SUPPORT_SLEEP_RETENTION && CONFIG_PM_POWER_DOWN_PERIPHERAL_IN_LIGHT_SLEEP
sleep_retention_module_init_param_t init_param = {
.cbs = {
.create = {
.handle = s_bus_create_sleep_retention_cb,
.arg = ctx,
},
},
.depends = RETENTION_MODULE_BITMAP_INIT(CLOCK_SYSTEM)
};
_lock_acquire(&ctx->mutex);
if (sleep_retention_module_init(spi_reg_retention_info[host_id - 1].module_id, &init_param) == ESP_OK) {
if ((bus_attr->bus_cfg.flags & SPICOMMON_BUSFLAG_SLP_ALLOW_PD) && (sleep_retention_module_allocate(spi_reg_retention_info[host_id - 1].module_id) != ESP_OK)) {
// even though the sleep retention create failed, SPI driver should still work, so just warning here
ESP_LOGW(SPI_TAG, "alloc sleep recover failed, peripherals may hold power on");
}
} else {
// even the sleep retention init failed, SPI driver should still work, so just warning here
ESP_LOGW(SPI_TAG, "init sleep recover failed, spi may offline after sleep");
}
_lock_release(&ctx->mutex);
#else
if (bus_attr->bus_cfg.flags & SPICOMMON_BUSFLAG_SLP_ALLOW_PD) {
ESP_LOGE(SPI_TAG, "power down peripheral in sleep is not enabled or not supported on your target");
}
#endif // SOC_SPI_SUPPORT_SLEEP_RETENTION
#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);
}
if (ctx->dma_ctx) {
free(ctx->dma_ctx->dmadesc_tx);
free(ctx->dma_ctx->dmadesc_rx);
spicommon_dma_chan_free(ctx->dma_ctx);
ctx->dma_ctx = NULL;
}
}
spicommon_periph_free(host_id);
free(bus_ctx[host_id]);
bus_ctx[host_id] = NULL;
return err;
}
void *spi_bus_dma_memory_alloc(spi_host_device_t host_id, size_t size, uint32_t extra_heap_caps)
{
(void) host_id; //remain for extendability
ESP_RETURN_ON_FALSE((extra_heap_caps & MALLOC_CAP_SPIRAM) == 0, NULL, SPI_TAG, "external memory is not supported now");
size_t dma_requir = 16; //TODO: IDF-10111, using max alignment temp, refactor to "gdma_get_alignment_constraints" instead
return heap_caps_aligned_calloc(dma_requir, 1, size, extra_heap_caps | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL);
}
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;
}
const spi_dma_ctx_t* spi_bus_get_dma_ctx(spi_host_device_t host_id)
{
if (bus_ctx[host_id] == NULL) {
return NULL;
}
return bus_ctx[host_id]->dma_ctx;
}
esp_err_t spi_bus_free(spi_host_device_t host_id)
{
if (bus_ctx[host_id] == NULL) {
return ESP_ERR_INVALID_STATE;
}
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);
if (err != ESP_OK) {
return err;
}
}
spicommon_bus_free_io_cfg(&bus_attr->bus_cfg);
#if SOC_SPI_SUPPORT_SLEEP_RETENTION && CONFIG_PM_POWER_DOWN_PERIPHERAL_IN_LIGHT_SLEEP
const periph_retention_module_t retention_id = spi_reg_retention_info[host_id - 1].module_id;
_lock_acquire(&ctx->mutex);
if (sleep_retention_is_module_created(retention_id)) {
assert(sleep_retention_is_module_inited(retention_id));
sleep_retention_module_free(retention_id);
}
if (sleep_retention_is_module_inited(retention_id)) {
sleep_retention_module_deinit(retention_id);
}
_lock_release(&ctx->mutex);
_lock_close(&ctx->mutex);
#endif
#ifdef CONFIG_PM_ENABLE
esp_pm_lock_delete(bus_attr->pm_lock);
#endif
spi_bus_deinit_lock(bus_attr->lock);
if (ctx->dma_ctx) {
free(ctx->dma_ctx->dmadesc_tx);
free(ctx->dma_ctx->dmadesc_rx);
spicommon_dma_chan_free(ctx->dma_ctx);
ctx->dma_ctx = NULL;
}
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;
bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void *arg)
{
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
SPI_COMMON_RCC_CLOCK_ATOMIC() {
spi_dma_ll_reset_register(dmachan);
}
ret = true;
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
return ret;
}
bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress(void)
{
return (dmaworkaround_waiting_for_chan != 0);
}
void IRAM_ATTR spicommon_dmaworkaround_idle(int dmachan)
{
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan - 1] = 0;
if (dmaworkaround_waiting_for_chan == dmachan) {
//Reset DMA
SPI_COMMON_RCC_CLOCK_ATOMIC() {
spi_dma_ll_reset_register(dmachan);
}
dmaworkaround_waiting_for_chan = 0;
//Call callback
dmaworkaround_cb(dmaworkaround_cb_arg);
}
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
}
void IRAM_ATTR spicommon_dmaworkaround_transfer_active(int dmachan)
{
portENTER_CRITICAL_ISR(&dmaworkaround_mux);
dmaworkaround_channels_busy[dmachan - 1] = 1;
portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
}
#endif //#if CONFIG_IDF_TARGET_ESP32
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