552 lines
No EOL
21 KiB
C
552 lines
No EOL
21 KiB
C
// Copyright 2015-2019 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <string.h>
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#include "sdkconfig.h"
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#include "driver/spi_master.h"
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#include "soc/spi_periph.h"
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#include "esp_types.h"
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#include "esp_attr.h"
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#include "esp_log.h"
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#include "esp_err.h"
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#include "soc/soc.h"
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#include "soc/dport_reg.h"
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#include "soc/lldesc.h"
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#include "driver/gpio.h"
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#include "driver/periph_ctrl.h"
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#include "esp_heap_caps.h"
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#include "driver/spi_common.h"
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#include "stdatomic.h"
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#include "hal/spi_hal.h"
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static const char *SPI_TAG = "spi";
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#define SPI_CHECK(a, str, ret_val) do { \
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if (!(a)) { \
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ESP_LOGE(SPI_TAG,"%s(%d): %s", __FUNCTION__, __LINE__, str); \
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return (ret_val); \
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} \
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} while(0)
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#define SPI_CHECK_PIN(pin_num, pin_name, check_output) if (check_output) { \
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SPI_CHECK(GPIO_IS_VALID_OUTPUT_GPIO(pin_num), pin_name" not valid", ESP_ERR_INVALID_ARG); \
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} else { \
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SPI_CHECK(GPIO_IS_VALID_GPIO(pin_num), pin_name" not valid", ESP_ERR_INVALID_ARG); \
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}
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typedef struct spi_device_t spi_device_t;
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#define FUNC_GPIO PIN_FUNC_GPIO
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#define DMA_CHANNEL_ENABLED(dma_chan) (BIT(dma_chan-1))
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//Periph 1 is 'claimed' by SPI flash code.
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static atomic_bool spi_periph_claimed[SOC_SPI_PERIPH_NUM] = { ATOMIC_VAR_INIT(true), ATOMIC_VAR_INIT(false), ATOMIC_VAR_INIT(false),
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#if SOC_SPI_PERIPH_NUM >= 4
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ATOMIC_VAR_INIT(false),
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#endif
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};
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static const char* spi_claiming_func[3] = {NULL, NULL, NULL};
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static uint8_t spi_dma_chan_enabled = 0;
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static portMUX_TYPE spi_dma_spinlock = portMUX_INITIALIZER_UNLOCKED;
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//Returns true if this peripheral is successfully claimed, false if otherwise.
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bool spicommon_periph_claim(spi_host_device_t host, const char* source)
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{
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bool false_var = false;
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bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &false_var, true);
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if (ret) {
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spi_claiming_func[host] = source;
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periph_module_enable(spi_periph_signal[host].module);
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} else {
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ESP_EARLY_LOGE(SPI_TAG, "SPI%d already claimed by %s.", host+1, spi_claiming_func[host]);
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}
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return ret;
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}
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bool spicommon_periph_in_use(spi_host_device_t host)
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{
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return atomic_load(&spi_periph_claimed[host]);
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}
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//Returns true if this peripheral is successfully freed, false if otherwise.
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bool spicommon_periph_free(spi_host_device_t host)
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{
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bool true_var = true;
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bool ret = atomic_compare_exchange_strong(&spi_periph_claimed[host], &true_var, false);
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if (ret) periph_module_disable(spi_periph_signal[host].module);
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return ret;
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}
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int spicommon_irqsource_for_host(spi_host_device_t host)
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{
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return spi_periph_signal[host].irq;
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}
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int spicommon_irqdma_source_for_host(spi_host_device_t host)
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{
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return spi_periph_signal[host].irq_dma;
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}
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spi_dev_t *spicommon_hw_for_host(spi_host_device_t host)
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{
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return spi_periph_signal[host].hw;
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}
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static inline uint32_t get_dma_periph(int dma_chan)
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{
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#ifdef CONFIG_IDF_TARGET_ESP32S2BETA
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if (dma_chan==1) {
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return PERIPH_SPI2_DMA_MODULE;
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} else if (dma_chan==2) {
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return PERIPH_SPI3_DMA_MODULE;
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} else if (dma_chan==3) {
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return PERIPH_SPI_SHARED_DMA_MODULE;
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} else {
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abort();
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return -1;
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}
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#elif defined(CONFIG_IDF_TARGET_ESP32)
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return PERIPH_SPI_DMA_MODULE;
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#endif
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}
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bool spicommon_dma_chan_claim (int dma_chan)
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{
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bool ret = false;
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assert(dma_chan >= 1 && dma_chan <= SOC_SPI_DMA_CHAN_NUM);
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portENTER_CRITICAL(&spi_dma_spinlock);
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if ( !(spi_dma_chan_enabled & DMA_CHANNEL_ENABLED(dma_chan)) ) {
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// get the channel only when it's not claimed yet.
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spi_dma_chan_enabled |= DMA_CHANNEL_ENABLED(dma_chan);
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ret = true;
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}
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#if CONFIG_IDF_TARGET_ESP32
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periph_module_enable(get_dma_periph(dma_chan));
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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if (dma_chan==1) {
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periph_module_enable(PERIPH_SPI2_DMA_MODULE);
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} else if (dma_chan==2) {
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periph_module_enable(PERIPH_SPI3_DMA_MODULE);
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} else if (dma_chan==3) {
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periph_module_enable(PERIPH_SPI_SHARED_DMA_MODULE);
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}
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#endif
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portEXIT_CRITICAL(&spi_dma_spinlock);
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return ret;
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}
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bool spicommon_dma_chan_in_use(int dma_chan)
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{
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assert(dma_chan==1 || dma_chan == 2);
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return spi_dma_chan_enabled & DMA_CHANNEL_ENABLED(dma_chan);
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}
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bool spicommon_dma_chan_free(int dma_chan)
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{
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assert( dma_chan == 1 || dma_chan == 2 );
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assert( spi_dma_chan_enabled & DMA_CHANNEL_ENABLED(dma_chan) );
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portENTER_CRITICAL(&spi_dma_spinlock);
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spi_dma_chan_enabled &= ~DMA_CHANNEL_ENABLED(dma_chan);
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#if CONFIG_IDF_TARGET_ESP32
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if ( spi_dma_chan_enabled == 0 ) {
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//disable the DMA only when all the channels are freed.
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periph_module_disable(get_dma_periph(dma_chan));
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}
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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if (dma_chan==1) {
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periph_module_disable(PERIPH_SPI2_DMA_MODULE);
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} else if (dma_chan==2) {
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periph_module_disable(PERIPH_SPI3_DMA_MODULE);
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} else if (dma_chan==3) {
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periph_module_disable(PERIPH_SPI_SHARED_DMA_MODULE);
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}
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#endif
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portEXIT_CRITICAL(&spi_dma_spinlock);
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return true;
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}
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static bool bus_uses_iomux_pins(spi_host_device_t host, const spi_bus_config_t* bus_config)
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{
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if (bus_config->sclk_io_num>=0 &&
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bus_config->sclk_io_num != spi_periph_signal[host].spiclk_iomux_pin) return false;
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if (bus_config->quadwp_io_num>=0 &&
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bus_config->quadwp_io_num != spi_periph_signal[host].spiwp_iomux_pin) return false;
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if (bus_config->quadhd_io_num>=0 &&
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bus_config->quadhd_io_num != spi_periph_signal[host].spihd_iomux_pin) return false;
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if (bus_config->mosi_io_num >= 0 &&
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bus_config->mosi_io_num != spi_periph_signal[host].spid_iomux_pin) return false;
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if (bus_config->miso_io_num>=0 &&
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bus_config->miso_io_num != spi_periph_signal[host].spiq_iomux_pin) return false;
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return true;
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}
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/*
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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
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bus config struct and it'll set up the GPIO matrix and enable the device. If a pin is set to non-negative value,
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it should be able to be initialized.
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*/
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esp_err_t spicommon_bus_initialize_io(spi_host_device_t host, const spi_bus_config_t *bus_config, int dma_chan, uint32_t flags, uint32_t* flags_o)
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{
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uint32_t temp_flag=0;
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bool miso_need_output;
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bool mosi_need_output;
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bool sclk_need_output;
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if ((flags&SPICOMMON_BUSFLAG_MASTER) != 0) {
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//initial for master
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miso_need_output = ((flags&SPICOMMON_BUSFLAG_DUAL) != 0) ? true : false;
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mosi_need_output = true;
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sclk_need_output = true;
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} else {
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//initial for slave
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miso_need_output = true;
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mosi_need_output = ((flags&SPICOMMON_BUSFLAG_DUAL) != 0) ? true : false;
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sclk_need_output = false;
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}
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const bool wp_need_output = true;
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const bool hd_need_output = true;
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//check pin capabilities
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if (bus_config->sclk_io_num>=0) {
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temp_flag |= SPICOMMON_BUSFLAG_SCLK;
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SPI_CHECK_PIN(bus_config->sclk_io_num, "sclk", sclk_need_output);
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}
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if (bus_config->quadwp_io_num>=0) {
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SPI_CHECK_PIN(bus_config->quadwp_io_num, "wp", wp_need_output);
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}
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if (bus_config->quadhd_io_num>=0) {
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SPI_CHECK_PIN(bus_config->quadhd_io_num, "hd", hd_need_output);
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}
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//set flags for QUAD mode according to the existence of wp and hd
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if (bus_config->quadhd_io_num >= 0 && bus_config->quadwp_io_num >= 0) temp_flag |= SPICOMMON_BUSFLAG_WPHD;
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if (bus_config->mosi_io_num >= 0) {
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temp_flag |= SPICOMMON_BUSFLAG_MOSI;
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SPI_CHECK_PIN(bus_config->mosi_io_num, "mosi", mosi_need_output);
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}
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if (bus_config->miso_io_num>=0) {
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temp_flag |= SPICOMMON_BUSFLAG_MISO;
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SPI_CHECK_PIN(bus_config->miso_io_num, "miso", miso_need_output);
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}
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//set flags for DUAL mode according to output-capability of MOSI and MISO pins.
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if ( (bus_config->mosi_io_num < 0 || GPIO_IS_VALID_OUTPUT_GPIO(bus_config->mosi_io_num)) &&
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(bus_config->miso_io_num < 0 || GPIO_IS_VALID_OUTPUT_GPIO(bus_config->miso_io_num)) ) {
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temp_flag |= SPICOMMON_BUSFLAG_DUAL;
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}
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//check if the selected pins correspond to the iomux pins of the peripheral
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bool use_iomux = bus_uses_iomux_pins(host, bus_config);
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if (use_iomux) temp_flag |= SPICOMMON_BUSFLAG_IOMUX_PINS;
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uint32_t missing_flag = flags & ~temp_flag;
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missing_flag &= ~SPICOMMON_BUSFLAG_MASTER;//don't check this flag
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if (missing_flag != 0) {
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//check pins existence
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if (missing_flag & SPICOMMON_BUSFLAG_SCLK) ESP_LOGE(SPI_TAG, "sclk pin required.");
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if (missing_flag & SPICOMMON_BUSFLAG_MOSI) ESP_LOGE(SPI_TAG, "mosi pin required.");
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if (missing_flag & SPICOMMON_BUSFLAG_MISO) ESP_LOGE(SPI_TAG, "miso pin required.");
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if (missing_flag & SPICOMMON_BUSFLAG_DUAL) ESP_LOGE(SPI_TAG, "not both mosi and miso output capable");
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if (missing_flag & SPICOMMON_BUSFLAG_WPHD) ESP_LOGE(SPI_TAG, "both wp and hd required.");
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if (missing_flag & SPICOMMON_BUSFLAG_IOMUX_PINS) ESP_LOGE(SPI_TAG, "not using iomux pins");
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SPI_CHECK(missing_flag == 0, "not all required capabilities satisfied.", ESP_ERR_INVALID_ARG);
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}
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if (use_iomux) {
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//All SPI iomux pin selections resolve to 1, so we put that here instead of trying to figure
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//out which FUNC_GPIOx_xSPIxx to grab; they all are defined to 1 anyway.
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ESP_LOGD(SPI_TAG, "SPI%d use iomux pins.", host+1);
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if (bus_config->mosi_io_num >= 0) {
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gpio_iomux_in(bus_config->mosi_io_num, spi_periph_signal[host].spid_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(bus_config->mosi_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(bus_config->mosi_io_num, spi_periph_signal[host].func, false);
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#endif
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}
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if (bus_config->miso_io_num >= 0) {
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gpio_iomux_in(bus_config->miso_io_num, spi_periph_signal[host].spiq_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(bus_config->miso_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(bus_config->miso_io_num, spi_periph_signal[host].func, false);
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#endif
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}
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if (bus_config->quadwp_io_num >= 0) {
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gpio_iomux_in(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(bus_config->quadwp_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(bus_config->quadwp_io_num, spi_periph_signal[host].func, false);
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#endif
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}
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if (bus_config->quadhd_io_num >= 0) {
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gpio_iomux_in(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(bus_config->quadhd_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(bus_config->quadhd_io_num, spi_periph_signal[host].func, false);
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#endif
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}
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if (bus_config->sclk_io_num >= 0) {
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gpio_iomux_in(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(bus_config->sclk_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(bus_config->sclk_io_num, spi_periph_signal[host].func, false);
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#endif
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}
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temp_flag |= SPICOMMON_BUSFLAG_IOMUX_PINS;
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} else {
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//Use GPIO matrix
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ESP_LOGD(SPI_TAG, "SPI%d use gpio matrix.", host+1);
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if (bus_config->mosi_io_num >= 0) {
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if (mosi_need_output || (temp_flag&SPICOMMON_BUSFLAG_DUAL)) {
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gpio_set_direction(bus_config->mosi_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(bus_config->mosi_io_num, spi_periph_signal[host].spid_out, false, false);
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} else {
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gpio_set_direction(bus_config->mosi_io_num, GPIO_MODE_INPUT);
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}
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gpio_matrix_in(bus_config->mosi_io_num, spi_periph_signal[host].spid_in, false);
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#if CONFIG_IDF_TARGET_ESP32S2BETA
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->mosi_io_num]);
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#endif
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[bus_config->mosi_io_num], FUNC_GPIO);
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}
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if (bus_config->miso_io_num >= 0) {
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if (miso_need_output || (temp_flag&SPICOMMON_BUSFLAG_DUAL)) {
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gpio_set_direction(bus_config->miso_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(bus_config->miso_io_num, spi_periph_signal[host].spiq_out, false, false);
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} else {
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gpio_set_direction(bus_config->miso_io_num, GPIO_MODE_INPUT);
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}
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gpio_matrix_in(bus_config->miso_io_num, spi_periph_signal[host].spiq_in, false);
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#if CONFIG_IDF_TARGET_ESP32S2BETA
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->miso_io_num]);
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#endif
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[bus_config->miso_io_num], FUNC_GPIO);
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}
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if (bus_config->quadwp_io_num >= 0) {
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gpio_set_direction(bus_config->quadwp_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_out, false, false);
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gpio_matrix_in(bus_config->quadwp_io_num, spi_periph_signal[host].spiwp_in, false);
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#if CONFIG_IDF_TARGET_ESP32S2BETA
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->quadwp_io_num]);
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#endif
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[bus_config->quadwp_io_num], FUNC_GPIO);
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}
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if (bus_config->quadhd_io_num >= 0) {
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gpio_set_direction(bus_config->quadhd_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_out, false, false);
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gpio_matrix_in(bus_config->quadhd_io_num, spi_periph_signal[host].spihd_in, false);
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#if CONFIG_IDF_TARGET_ESP32S2BETA
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->quadhd_io_num]);
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#endif
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[bus_config->quadhd_io_num], FUNC_GPIO);
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}
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if (bus_config->sclk_io_num >= 0) {
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if (sclk_need_output) {
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gpio_set_direction(bus_config->sclk_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_out, false, false);
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} else {
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gpio_set_direction(bus_config->sclk_io_num, GPIO_MODE_INPUT);
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}
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gpio_matrix_in(bus_config->sclk_io_num, spi_periph_signal[host].spiclk_in, false);
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#if CONFIG_IDF_TARGET_ESP32S2BETA
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[bus_config->sclk_io_num]);
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#endif
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[bus_config->sclk_io_num], FUNC_GPIO);
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}
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}
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//Select DMA channel.
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#ifdef CONFIG_IDF_TARGET_ESP32
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DPORT_SET_PERI_REG_BITS(DPORT_SPI_DMA_CHAN_SEL_REG, 3, dma_chan, (host * 2));
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#elif defined(CONFIG_IDF_TARGET_ESP32S2BETA)
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if (dma_chan==VSPI_HOST) {
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DPORT_SET_PERI_REG_MASK(DPORT_SPI_DMA_CHAN_SEL_REG, DPORT_SPI_SHARED_DMA_SEL_M);
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}
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#endif
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if (flags_o) *flags_o = temp_flag;
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return ESP_OK;
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}
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//Find any pin with output muxed to ``func`` and reset it to GPIO
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static void reset_func_to_gpio(int func)
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{
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for (int x = 0; x < GPIO_PIN_COUNT; x++) {
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if (GPIO_IS_VALID_GPIO(x) && (READ_PERI_REG(GPIO_FUNC0_OUT_SEL_CFG_REG + (x * 4))&GPIO_FUNC0_OUT_SEL_M) == func) {
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gpio_matrix_out(x, SIG_GPIO_OUT_IDX, false, false);
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}
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}
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}
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esp_err_t spicommon_bus_free_io(spi_host_device_t host)
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{
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if (REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spid_iomux_pin], MCU_SEL) == 1) PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spid_iomux_pin], PIN_FUNC_GPIO);
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if (REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiq_iomux_pin], MCU_SEL) == 1) PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiq_iomux_pin], PIN_FUNC_GPIO);
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if (REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiclk_iomux_pin], MCU_SEL) == 1) PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiclk_iomux_pin], PIN_FUNC_GPIO);
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if (REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiwp_iomux_pin], MCU_SEL) == 1) PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spiwp_iomux_pin], PIN_FUNC_GPIO);
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if (REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spihd_iomux_pin], MCU_SEL) == 1) PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spihd_iomux_pin], PIN_FUNC_GPIO);
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reset_func_to_gpio(spi_periph_signal[host].spid_out);
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reset_func_to_gpio(spi_periph_signal[host].spiq_out);
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reset_func_to_gpio(spi_periph_signal[host].spiclk_out);
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reset_func_to_gpio(spi_periph_signal[host].spiwp_out);
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reset_func_to_gpio(spi_periph_signal[host].spihd_out);
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return ESP_OK;
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}
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esp_err_t spicommon_bus_free_io_cfg(const spi_bus_config_t *bus_cfg)
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{
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int pin_array[] = {
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bus_cfg->mosi_io_num,
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bus_cfg->miso_io_num,
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bus_cfg->sclk_io_num,
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bus_cfg->quadwp_io_num,
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bus_cfg->quadhd_io_num,
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};
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for (int i = 0; i < sizeof(pin_array)/sizeof(int); i ++) {
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const int io = pin_array[i];
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if (io >= 0 && GPIO_IS_VALID_GPIO(io)) gpio_reset_pin(io);
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}
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return ESP_OK;
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}
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void spicommon_cs_initialize(spi_host_device_t host, int cs_io_num, int cs_num, int force_gpio_matrix)
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{
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if (!force_gpio_matrix && cs_io_num == spi_periph_signal[host].spics0_iomux_pin && cs_num == 0) {
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//The cs0s for all SPI peripherals map to pin mux source 1, so we use that instead of a define.
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gpio_iomux_in(cs_io_num, spi_periph_signal[host].spics_in);
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#if CONFIG_IDF_TARGET_ESP32
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gpio_iomux_out(cs_io_num, spi_periph_signal[host].func, false);
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#elif CONFIG_IDF_TARGET_ESP32S2BETA
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gpio_iomux_out(cs_io_num, spi_periph_signal[host].func, false);
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#endif
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} else {
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//Use GPIO matrix
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if (GPIO_IS_VALID_OUTPUT_GPIO(cs_io_num)) {
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gpio_set_direction(cs_io_num, GPIO_MODE_INPUT_OUTPUT);
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gpio_matrix_out(cs_io_num, spi_periph_signal[host].spics_out[cs_num], false, false);
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} else {
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gpio_set_direction(cs_io_num, GPIO_MODE_INPUT);
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}
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if (cs_num == 0) gpio_matrix_in(cs_io_num, spi_periph_signal[host].spics_in, false);
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PIN_INPUT_ENABLE(GPIO_PIN_MUX_REG[cs_io_num]);
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[cs_io_num], FUNC_GPIO);
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}
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}
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void spicommon_cs_free(spi_host_device_t host, int cs_io_num)
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{
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if (cs_io_num == 0 && REG_GET_FIELD(GPIO_PIN_MUX_REG[spi_periph_signal[host].spics0_iomux_pin], MCU_SEL) == 1) {
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PIN_FUNC_SELECT(GPIO_PIN_MUX_REG[spi_periph_signal[host].spics0_iomux_pin], PIN_FUNC_GPIO);
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}
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reset_func_to_gpio(spi_periph_signal[host].spics_out[cs_io_num]);
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}
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void spicommon_cs_free_io(int cs_gpio_num)
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{
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assert(cs_gpio_num>=0 && GPIO_IS_VALID_GPIO(cs_gpio_num));
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gpio_reset_pin(cs_gpio_num);
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}
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//Set up a list of dma descriptors. dmadesc is an array of descriptors. Data is the buffer to point to.
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void IRAM_ATTR spicommon_setup_dma_desc_links(lldesc_t *dmadesc, int len, const uint8_t *data, bool isrx)
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{
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lldesc_setup_link(dmadesc, data, len, isrx);
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}
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/*
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Code for workaround for DMA issue in ESP32 v0/v1 silicon
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*/
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#if CONFIG_IDF_TARGET_ESP32
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static volatile int dmaworkaround_channels_busy[2] = {0, 0};
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static dmaworkaround_cb_t dmaworkaround_cb;
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static void *dmaworkaround_cb_arg;
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static portMUX_TYPE dmaworkaround_mux = portMUX_INITIALIZER_UNLOCKED;
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static int dmaworkaround_waiting_for_chan = 0;
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#endif
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bool IRAM_ATTR spicommon_dmaworkaround_req_reset(int dmachan, dmaworkaround_cb_t cb, void *arg)
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{
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#if CONFIG_IDF_TARGET_ESP32
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int otherchan = (dmachan == 1) ? 2 : 1;
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bool ret;
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portENTER_CRITICAL_ISR(&dmaworkaround_mux);
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if (dmaworkaround_channels_busy[otherchan-1]) {
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//Other channel is busy. Call back when it's done.
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dmaworkaround_cb = cb;
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dmaworkaround_cb_arg = arg;
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dmaworkaround_waiting_for_chan = otherchan;
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ret = false;
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} else {
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//Reset DMA
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periph_module_reset( PERIPH_SPI_DMA_MODULE );
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ret = true;
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}
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portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
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return ret;
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#else
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//no need to reset
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return true;
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#endif
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}
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bool IRAM_ATTR spicommon_dmaworkaround_reset_in_progress()
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{
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#if CONFIG_IDF_TARGET_ESP32
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return (dmaworkaround_waiting_for_chan != 0);
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#else
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return false;
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#endif
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}
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void IRAM_ATTR spicommon_dmaworkaround_idle(int dmachan)
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{
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#if CONFIG_IDF_TARGET_ESP32
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portENTER_CRITICAL_ISR(&dmaworkaround_mux);
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dmaworkaround_channels_busy[dmachan-1] = 0;
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if (dmaworkaround_waiting_for_chan == dmachan) {
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//Reset DMA
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periph_module_reset( PERIPH_SPI_DMA_MODULE );
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dmaworkaround_waiting_for_chan = 0;
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//Call callback
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dmaworkaround_cb(dmaworkaround_cb_arg);
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}
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portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
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#endif
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}
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void IRAM_ATTR spicommon_dmaworkaround_transfer_active(int dmachan)
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{
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#if CONFIG_IDF_TARGET_ESP32
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portENTER_CRITICAL_ISR(&dmaworkaround_mux);
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dmaworkaround_channels_busy[dmachan-1] = 1;
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portEXIT_CRITICAL_ISR(&dmaworkaround_mux);
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#endif
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} |