/* * SPDX-FileCopyrightText: 2019-2023 Espressif Systems (Shanghai) CO LTD * * SPDX-License-Identifier: Apache-2.0 */ /** * This file is a target specific for DAC DMA peripheral * Target: ESP32 * DAC DMA peripheral (data source): I2S0 (i.e. use I2S DMA to transmit data) * DAC DMA interrupt source: I2S0 * DAC digital controller clock source: I2S ws signal (root clock: D2PLL or APLL) */ #include "freertos/FreeRTOS.h" #include "sdkconfig.h" #include "hal/adc_ll.h" #include "hal/i2s_hal.h" #include "hal/i2s_types.h" #include "soc/i2s_periph.h" #include "../dac_priv_dma.h" #include "esp_private/i2s_platform.h" #include "esp_private/esp_clk.h" #include "clk_ctrl_os.h" #if CONFIG_DAC_ENABLE_DEBUG_LOG // The local log level must be defined before including esp_log.h // Set the maximum log level for this source file #define LOG_LOCAL_LEVEL ESP_LOG_DEBUG #endif #include "esp_check.h" #include "esp_attr.h" #define DAC_DMA_PERIPH_I2S_NUM 0 #define DAC_DMA_PERIPH_I2S_BIT_WIDTH 16 // Fixed bit width, only the high 8 bits take effect typedef struct { void *periph_dev; /* DMA peripheral device address */ intr_handle_t intr_handle; /* Interrupt handle */ bool use_apll; /* Whether use APLL as clock source */ } dac_dma_periph_i2s_t; static dac_dma_periph_i2s_t *s_ddp = NULL; // Static DAC DMA peripheral structure pointer static const char *TAG = "DAC_DMA"; static uint32_t s_dac_set_apll_freq(uint32_t mclk) { /* Calculate the expected APLL */ int div = (int)((SOC_APLL_MIN_HZ / mclk) + 1); /* apll_freq = mclk * div * when div = 1, hardware will still divide 2 * when div = 0, hardware will divide 255 * So the div here should be at least 2 */ div = div < 2 ? 2 : div; uint32_t expt_freq = mclk * div; /* Set APLL coefficients to the given frequency */ uint32_t real_freq = 0; esp_err_t ret = periph_rtc_apll_freq_set(expt_freq, &real_freq); if (ret == ESP_ERR_INVALID_ARG) { return 0; } if (ret == ESP_ERR_INVALID_STATE) { ESP_LOGW(TAG, "APLL is occupied already, it is working at %"PRIu32" Hz", real_freq); } ESP_LOGD(TAG, "APLL expected frequency is %"PRIu32" Hz, real frequency is %"PRIu32" Hz", expt_freq, real_freq); return real_freq; } /** * @brief Calculate and set DAC data frequency * @note DAC frequency is decided by I2S WS frequency, the clock source of I2S is D2PLL or APLL on ESP32 * freq_hz = ws = bclk / I2S_LL_AD_BCK_FACTOR * @param freq_hz DAC byte transmit frequency * @return * - ESP_OK config success * - ESP_ERR_INVALID_ARG invalid frequency */ static esp_err_t s_dac_dma_periph_set_clock(uint32_t freq_hz, bool is_apll) { /* Calculate clock coefficients */ uint32_t bclk = freq_hz * I2S_LL_AD_BCK_FACTOR; uint32_t bclk_div = DAC_DMA_PERIPH_I2S_BIT_WIDTH; uint32_t mclk = bclk * bclk_div; uint32_t sclk; // use 160M PLL clock as default, minimum support freq: 19.6 KHz maximum support freq: 2.5 MHz if (is_apll) { sclk = s_dac_set_apll_freq(mclk); ESP_RETURN_ON_FALSE(sclk, ESP_ERR_INVALID_ARG, TAG, "set APLL coefficients failed"); } else { // [clk_tree] TODO: replace the following clock by clk_tree API sclk = esp_clk_apb_freq() * 2; // D2PLL } uint32_t mclk_div = sclk / mclk; /* Check if the configuration is correct */ ESP_RETURN_ON_FALSE(sclk / (float)mclk > 1.99, ESP_ERR_INVALID_ARG, TAG, "Frequency is too large, the mclk division is below minimum value 2"); ESP_RETURN_ON_FALSE(mclk_div < 256, ESP_ERR_INVALID_ARG, TAG, "Frequency is too small, the mclk division exceed the maximum value 255"); ESP_LOGD(TAG, "[sclk] %"PRIu32" [mclk] %"PRIu32" [mclk_div] %"PRIu32" [bclk] %"PRIu32" [bclk_div] %"PRIu32, sclk, mclk, mclk_div, bclk, bclk_div); i2s_ll_tx_clk_set_src(s_ddp->periph_dev, is_apll ? I2S_CLK_SRC_APLL : I2S_CLK_SRC_DEFAULT); i2s_ll_mclk_div_t mclk_div_coeff = {}; i2s_hal_calc_mclk_precise_division(sclk, mclk, &mclk_div_coeff); i2s_ll_tx_set_mclk(s_ddp->periph_dev, &mclk_div_coeff); i2s_ll_tx_set_bck_div_num(s_ddp->periph_dev, bclk_div); return ESP_OK; } esp_err_t dac_dma_periph_init(uint32_t freq_hz, bool is_alternate, bool is_apll) { #if CONFIG_DAC_ENABLE_DEBUG_LOG esp_log_level_set(TAG, ESP_LOG_DEBUG); #endif esp_err_t ret = ESP_OK; /* Acquire DMA peripheral */ ESP_RETURN_ON_ERROR(i2s_platform_acquire_occupation(DAC_DMA_PERIPH_I2S_NUM, "dac_dma"), TAG, "Failed to acquire DAC DMA peripheral"); /* Allocate DAC DMA peripheral object */ s_ddp = (dac_dma_periph_i2s_t *)heap_caps_calloc(1, sizeof(dac_dma_periph_i2s_t), MALLOC_CAP_INTERNAL | MALLOC_CAP_8BIT); ESP_GOTO_ON_FALSE(s_ddp, ESP_ERR_NO_MEM, err, TAG, "No memory for DAC DMA object"); s_ddp->periph_dev = (void *)I2S_LL_GET_HW(DAC_DMA_PERIPH_I2S_NUM); if (is_apll) { periph_rtc_apll_acquire(); s_ddp->use_apll = true; } ESP_GOTO_ON_ERROR(s_dac_dma_periph_set_clock(freq_hz, is_apll), err, TAG, "Failed to set clock of DMA peripheral"); i2s_ll_enable_builtin_dac(s_ddp->periph_dev, true); i2s_ll_tx_reset(s_ddp->periph_dev); i2s_ll_tx_set_slave_mod(s_ddp->periph_dev, false); i2s_ll_tx_set_sample_bit(s_ddp->periph_dev, DAC_DMA_PERIPH_I2S_BIT_WIDTH, DAC_DMA_PERIPH_I2S_BIT_WIDTH); i2s_ll_tx_enable_mono_mode(s_ddp->periph_dev, !is_alternate); i2s_ll_tx_select_std_slot(s_ddp->periph_dev, I2S_STD_SLOT_BOTH, !is_alternate); i2s_ll_tx_enable_msb_shift(s_ddp->periph_dev, false); i2s_ll_tx_set_ws_width(s_ddp->periph_dev, DAC_DMA_PERIPH_I2S_BIT_WIDTH); i2s_ll_tx_enable_msb_right(s_ddp->periph_dev, false); i2s_ll_tx_enable_right_first(s_ddp->periph_dev, true); /* Should always enable fifo */ i2s_ll_tx_force_enable_fifo_mod(s_ddp->periph_dev, true); i2s_ll_dma_enable_auto_write_back(s_ddp->periph_dev, true); /* Enable the interrupts */ i2s_ll_enable_intr(s_ddp->periph_dev, I2S_LL_EVENT_TX_EOF | I2S_LL_EVENT_TX_TEOF, true); return ret; err: dac_dma_periph_deinit(); return ret; } esp_err_t dac_dma_periph_deinit(void) { ESP_RETURN_ON_FALSE(s_ddp->intr_handle == NULL, ESP_ERR_INVALID_STATE, TAG, "The interrupt is not deregistered yet"); ESP_RETURN_ON_ERROR(i2s_platform_release_occupation(DAC_DMA_PERIPH_I2S_NUM), TAG, "Failed to release DAC DMA peripheral"); i2s_ll_enable_intr(s_ddp->periph_dev, I2S_LL_EVENT_TX_EOF | I2S_LL_EVENT_TX_TEOF, false); if (s_ddp) { if (s_ddp->use_apll) { periph_rtc_apll_release(); s_ddp->use_apll = false; } free(s_ddp); s_ddp = NULL; } return ESP_OK; } int dac_dma_periph_get_intr_signal(void) { return i2s_periph_signal[DAC_DMA_PERIPH_I2S_NUM].irq; } static void s_dac_dma_periph_reset(void) { i2s_ll_tx_reset(s_ddp->periph_dev); i2s_ll_tx_reset_dma(s_ddp->periph_dev); i2s_ll_tx_reset_fifo(s_ddp->periph_dev); } static void s_dac_dma_periph_start(void) { i2s_ll_enable_dma(s_ddp->periph_dev,true); i2s_ll_tx_enable_intr(s_ddp->periph_dev); i2s_ll_tx_start(s_ddp->periph_dev); i2s_ll_dma_enable_eof_on_fifo_empty(s_ddp->periph_dev, true); i2s_ll_dma_enable_auto_write_back(s_ddp->periph_dev, true); } static void s_dac_dma_periph_stop(void) { i2s_ll_tx_stop(s_ddp->periph_dev); i2s_ll_tx_stop_link(s_ddp->periph_dev); i2s_ll_tx_disable_intr(s_ddp->periph_dev); i2s_ll_enable_dma(s_ddp->periph_dev, false); i2s_ll_dma_enable_eof_on_fifo_empty(s_ddp->periph_dev, false); i2s_ll_dma_enable_auto_write_back(s_ddp->periph_dev, false); } void dac_dma_periph_enable(void) { /* Reset */ s_dac_dma_periph_reset(); /* Start */ s_dac_dma_periph_start(); } void dac_dma_periph_disable(void) { /* Reset */ s_dac_dma_periph_reset(); /* Stop */ s_dac_dma_periph_stop(); } uint32_t IRAM_ATTR dac_dma_periph_intr_is_triggered(void) { uint32_t status = i2s_ll_get_intr_status(s_ddp->periph_dev); if (status == 0) { //Avoid spurious interrupt return false; } i2s_ll_clear_intr_status(s_ddp->periph_dev, status); uint32_t ret = 0; ret |= (status & I2S_LL_EVENT_TX_EOF) ? DAC_DMA_EOF_INTR : 0; ret |= (status & I2S_LL_EVENT_TX_TEOF) ? DAC_DMA_TEOF_INTR : 0; return ret; } uint32_t IRAM_ATTR dac_dma_periph_intr_get_eof_desc(void) { uint32_t finish_desc; i2s_ll_tx_get_eof_des_addr(s_ddp->periph_dev, &finish_desc); return finish_desc; } void dac_dma_periph_dma_trans_start(uint32_t desc_addr) { i2s_ll_tx_start_link(s_ddp->periph_dev, desc_addr); }