ESP-IDF
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Outline
#include "esp_private/spi_share_hw_ctrl.h"
#include <stdatomic.h>
#include "sdkconfig.h"
#include "soc/soc_caps.h"
#include "hal/spi_ll.h"
#include "esp_log.h"
SPI_TAG
spi_periph_claimed
spi_claiming_func
spicommon_periph_claim(spi_host_device_t, const char *)
spicommon_periph_in_use(spi_host_device_t)
spicommon_periph_free(spi_host_device_t)
Files
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SourceVuESP-IDF Framework and ExamplesESP-IDFcomponents/esp_hw_support/spi_share_hw_ctrl.c
 
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/* * SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 *//* ... */ #include "esp_private/spi_share_hw_ctrl.h" #include <stdatomic.h> #include "sdkconfig.h" #include "soc/soc_caps.h" #include "hal/spi_ll.h" #include "esp_log.h"6 includes static const char* SPI_TAG = "spi_share_hw_ctrl"; //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}; //----------------------------------------------------------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; SPI_COMMON_RCC_CLOCK_ATOMIC() { spi_ll_enable_bus_clock(host, true); spi_ll_reset_register(host); }{...} }{...} 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) { SPI_COMMON_RCC_CLOCK_ATOMIC() { spi_ll_enable_bus_clock(host, false); }{...} }{...} return ret; }{ ... }
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