/*
 * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
 *
 * SPDX-License-Identifier: CC0-1.0
 */

#include <math.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/dac_continuous.h"
#include "esp_check.h"
#include "dac_continuous_example.h"

#define EXAMPLE_WAVE_FREQ_HZ        2000                      // 默认波形频率2000Hz，不能太低
#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

extern uint8_t sin_wav[EXAMPLE_ARRAY_LEN];                      // 用于存储正弦波值
extern uint8_t tri_wav[EXAMPLE_ARRAY_LEN];                      // 用于存储三角波值
extern uint8_t saw_wav[EXAMPLE_ARRAY_LEN];                      // 用于存储锯齿波值
extern uint8_t squ_wav[EXAMPLE_ARRAY_LEN];                      // 用于存储方波值

static const char *TAG = "dac continuous(DMA)";
static const char wav_name[DAC_WAVE_MAX][15] = {"sine", "triangle", "sawtooth", "square"};

static void dac_dma_write_task(void *args)
{
    dac_continuous_handle_t handle = (dac_continuous_handle_t)args;
    dac_example_wave_type_t wav_sel = DAC_SINE_WAVE; // 从正弦波开始

    size_t buf_len = EXAMPLE_ARRAY_LEN;

    while (1) {
        /* 缓冲区中的波形将循环转换 */
        switch (wav_sel) {
        case DAC_SINE_WAVE:
            ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)sin_wav, buf_len, NULL));
            break;
        case DAC_TRIANGLE_WAVE:
            ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)tri_wav, buf_len, NULL));
            break;
        case DAC_SAWTOOTH_WAVE:
            ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)saw_wav, buf_len, NULL));
            break;
        case DAC_SQUARE_WAVE:
            ESP_ERROR_CHECK(dac_continuous_write_cyclically(handle, (uint8_t *)squ_wav, buf_len, NULL));
            break;
        default:
            break;
        }
        /* 每CONFIG_EXAMPLE_WAVE_PERIOD_SEC秒切换波形 */
        vTaskDelay(pdMS_TO_TICKS(CONFIG_EXAMPLE_WAVE_PERIOD_SEC * 1000));
        wav_sel++;
        wav_sel %= DAC_WAVE_MAX;
        ESP_LOGI(TAG, "%s wave start", wav_name[wav_sel]);
    }
}

void example_dac_continuous_by_dma(void)
{
    dac_continuous_handle_t cont_handle;
    dac_continuous_config_t cont_cfg = {
        .chan_mask = DAC_CHANNEL_MASK_ALL,
        .desc_num = 8,
        .buf_size = 2048,
        .freq_hz = EXAMPLE_CONVERT_FREQ_HZ,
        .offset = 0,
        .clk_src = DAC_DIGI_CLK_SRC_DEFAULT,     // 如果频率超出范围，尝试'DAC_DIGI_CLK_SRC_APLL'
        /* 假设缓冲区中的数据是'A B C D E F'
         * DAC_CHANNEL_MODE_SIMUL:
         *      - 通道0: A B C D E F
         *      - 通道1: A B C D E F
         * DAC_CHANNEL_MODE_ALTER:
         *      - 通道0: A C E
         *      - 通道1: B D F
         */
        .chan_mode = DAC_CHANNEL_MODE_SIMUL,
    };
    /* 分配连续通道 */
    ESP_ERROR_CHECK(dac_continuous_new_channels(&cont_cfg, &cont_handle));
    /* 启用组中的通道 */
    ESP_ERROR_CHECK(dac_continuous_enable(cont_handle));

    example_log_info(EXAMPLE_CONVERT_FREQ_HZ, EXAMPLE_WAVE_FREQ_HZ);

    /* 开始转换波形 */
    xTaskCreate(dac_dma_write_task, "dac_dma_write_task", 4096, cont_handle, 5, NULL);
}