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https://github.com/espressif/esp-idf.git
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79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/*
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* SPDX-FileCopyrightText: 2015-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include "esp_check.h"
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#include "i2s_private.h"
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static const char *TAG = "i2s_platform";
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/**
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* @brief Global i2s platform object
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* @note For saving all the I2S related information
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*/
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i2s_platform_t g_i2s = {
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.spinlock = (portMUX_TYPE)portMUX_INITIALIZER_UNLOCKED,
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.controller[0 ...(SOC_I2S_NUM - 1)] = NULL, // groups will be lazy installed
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.comp_name[0 ...(SOC_I2S_NUM - 1)] = NULL,
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};
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/*---------------------------------------------------------------------------
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I2S Platform APIs
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----------------------------------------------------------------------------
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Scope: This file and ADC/DAC/LCD driver
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----------------------------------------------------------------------------*/
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esp_err_t i2s_platform_acquire_occupation(int id, const char *comp_name)
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{
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esp_err_t ret = ESP_OK;
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const char *occupied_comp = NULL;
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ESP_RETURN_ON_FALSE(id < SOC_I2S_NUM, ESP_ERR_INVALID_ARG, TAG, "invalid i2s port id");
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portENTER_CRITICAL(&g_i2s.spinlock);
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if ((!g_i2s.controller[id]) && (g_i2s.comp_name[id] == NULL)) {
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g_i2s.comp_name[id] = comp_name;
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/* Enable module clock */
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I2S_RCC_ATOMIC() {
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i2s_ll_enable_bus_clock(id, true);
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i2s_ll_reset_register(id);
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i2s_ll_enable_core_clock(I2S_LL_GET_HW(id), true);
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}
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} else {
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occupied_comp = g_i2s.comp_name[id];
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ret = ESP_ERR_NOT_FOUND;
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}
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portEXIT_CRITICAL(&g_i2s.spinlock);
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if (occupied_comp != NULL) {
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ESP_LOGW(TAG, "i2s controller %d has been occupied by %s", id, occupied_comp);
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}
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return ret;
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}
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esp_err_t i2s_platform_release_occupation(int id)
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{
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esp_err_t ret = ESP_OK;
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ESP_RETURN_ON_FALSE(id < SOC_I2S_NUM, ESP_ERR_INVALID_ARG, TAG, "invalid i2s port id");
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portENTER_CRITICAL(&g_i2s.spinlock);
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if (!g_i2s.controller[id]) {
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g_i2s.comp_name[id] = NULL;
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/* Disable module clock */
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I2S_RCC_ATOMIC() {
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i2s_ll_enable_bus_clock(id, false);
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i2s_ll_enable_core_clock(I2S_LL_GET_HW(id), false);
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}
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} else {
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ret = ESP_ERR_INVALID_STATE;
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}
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portEXIT_CRITICAL(&g_i2s.spinlock);
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return ret;
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}
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// Only used in `test_i2s_iram.c` to write DMA buffer directly
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size_t i2s_platform_get_dma_buffer_offset(void)
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{
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/* Force to transfer address '0' into 'i2s_chan_handle_t' type,
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* then find the corresponding field , the address of this field is the offset of this type */
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return (size_t) & (((i2s_chan_handle_t)0)->dma.bufs);
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}
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