88 lines
3.3 KiB
C
88 lines
3.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: CC0-1.0
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*/
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#include <math.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "driver/dac_continuous.h"
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#include "esp_check.h"
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#include "dac_continuous_example.h"
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#define EXAMPLE_WAVE_FREQ_HZ 2000 // 默认波形频率2000Hz，不能太低
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#define EXAMPLE_CONVERT_FREQ_HZ (EXAMPLE_ARRAY_LEN * EXAMPLE_WAVE_FREQ_HZ) // DAC转换波形数组中每个数据的频率
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extern uint8_t sin_wav[EXAMPLE_ARRAY_LEN]; // 用于存储正弦波值
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extern uint8_t tri_wav[EXAMPLE_ARRAY_LEN]; // 用于存储三角波值
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extern uint8_t saw_wav[EXAMPLE_ARRAY_LEN]; // 用于存储锯齿波值
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extern uint8_t squ_wav[EXAMPLE_ARRAY_LEN]; // 用于存储方波值
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static const char *TAG = "dac continuous(DMA)";
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static const char wav_name[DAC_WAVE_MAX][15] = {"sine", "triangle", "sawtooth", "square"};
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static void dac_dma_write_task(void *args)
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{
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dac_continuous_handle_t handle = (dac_continuous_handle_t)args;
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dac_example_wave_type_t wav_sel = DAC_SINE_WAVE; // 从正弦波开始
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size_t buf_len = EXAMPLE_ARRAY_LEN;
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while (1) {
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/* 缓冲区中的波形将循环转换 */
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switch (wav_sel) {
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case DAC_SINE_WAVE:
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ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)sin_wav, buf_len, NULL));
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break;
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case DAC_TRIANGLE_WAVE:
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ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)tri_wav, buf_len, NULL));
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break;
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case DAC_SAWTOOTH_WAVE:
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ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)saw_wav, buf_len, NULL));
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break;
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case DAC_SQUARE_WAVE:
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ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)squ_wav, buf_len, NULL));
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break;
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default:
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break;
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}
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/* 每CONFIG_EXAMPLE_WAVE_PERIOD_SEC秒切换波形 */
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vTaskDelay(pdMS_TO_TICKS(CONFIG_EXAMPLE_WAVE_PERIOD_SEC * 1000));
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wav_sel++;
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wav_sel %= DAC_WAVE_MAX;
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ESP_LOGI(TAG, "%s wave start", wav_name[wav_sel]);
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}
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}
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void example_dac_continuous_by_dma(void)
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{
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dac_continuous_handle_t cont_handle;
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dac_continuous_config_t cont_cfg = {
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.chan_mask = DAC_CHANNEL_MASK_ALL,
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.desc_num = 8,
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.buf_size = 2048,
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.freq_hz = EXAMPLE_CONVERT_FREQ_HZ,
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.offset = 0,
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.clk_src = DAC_DIGI_CLK_SRC_DEFAULT, // 如果频率超出范围，尝试'DAC_DIGI_CLK_SRC_APLL'
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/* 假设缓冲区中的数据是'A B C D E F'
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* DAC_CHANNEL_MODE_SIMUL:
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* - 通道0: A B C D E F
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* - 通道1: A B C D E F
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* DAC_CHANNEL_MODE_ALTER:
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* - 通道0: A C E
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* - 通道1: B D F
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*/
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.chan_mode = DAC_CHANNEL_MODE_SIMUL,
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};
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/* 分配连续通道 */
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ESP_ERROR_CHECK(dac_continuous_new_channels(&cont_cfg, &cont_handle));
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/* 启用组中的通道 */
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ESP_ERROR_CHECK(dac_continuous_enable(cont_handle));
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example_log_info(EXAMPLE_CONVERT_FREQ_HZ, EXAMPLE_WAVE_FREQ_HZ);
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/* 开始转换波形 */
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xTaskCreate(dac_dma_write_task, "dac_dma_write_task", 4096, cont_handle, 5, NULL);
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}
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