esp32驱动pcm1808的代码

以下是一个简单的ESP32驱动PCM1808的示例代码，使用ESP-IDF开发框架：

#include <stdio.h>
#include "driver/i2c.h"
#include "driver/spi_master.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_log.h"

#define I2C_MASTER_SCL_IO           14            /*!< gpio number for I2C master clock */
#define I2C_MASTER_SDA_IO           15            /*!< gpio number for I2C master data  */
#define I2C_MASTER_NUM              I2C_NUM_0     /*!< I2C port number for master dev */
#define I2C_MASTER_TX_BUF_DISABLE   0             /*!< I2C master do not need buffer */
#define I2C_MASTER_RX_BUF_DISABLE   0             /*!< I2C master do not need buffer */
#define I2C_MASTER_FREQ_HZ          100000        /*!< I2C master clock frequency */

#define SPI_BUS                     HSPI_HOST     /*!< SPI bus used */
#define SPI_SCK                     18            /*!< SPI SCK GPIO pin number */
#define SPI_MOSI                    23            /*!< SPI MOSI GPIO pin number */
#define SPI_MISO                    19            /*!< SPI MISO GPIO pin number */
#define SPI_CS                      5             /*!< SPI CS GPIO pin number */

#define PCM1808_ADDR                0x4C          /*!< PCM1808 I2C address */

#define TAG                         "PCM1808"

/**
 * @brief I2C master initialization
 */
static esp_err_t i2c_master_init(void)
{
    int i2c_master_port = I2C_MASTER_NUM;
    i2c_config_t conf;
    conf.mode = I2C_MODE_MASTER;
    conf.sda_io_num = I2C_MASTER_SDA_IO;
    conf.sda_pullup_en = GPIO_PULLUP_ENABLE;
    conf.scl_io_num = I2C_MASTER_SCL_IO;
    conf.scl_pullup_en = GPIO_PULLUP_ENABLE;
    conf.master.clk_speed = I2C_MASTER_FREQ_HZ;
    i2c_param_config(i2c_master_port, &conf);
    return i2c_driver_install(i2c_master_port, conf.mode, I2C_MASTER_RX_BUF_DISABLE, I2C_MASTER_TX_BUF_DISABLE, 0);
}

/**
 * @brief Read data from PCM1808
 */
static void pcm1808_read_task(void *arg)
{
    uint8_t data[2];
    while (1) {
        i2c_cmd_handle_t cmd = i2c_cmd_link_create();
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, PCM1808_ADDR << 1 | I2C_MASTER_WRITE, true);
        i2c_master_write_byte(cmd, 0x00, true);
        i2c_master_start(cmd);
        i2c_master_write_byte(cmd, PCM1808_ADDR << 1 | I2C_MASTER_READ, true);
        i2c_master_read_byte(cmd, &data[0], I2C_MASTER_ACK);
        i2c_master_read_byte(cmd, &data[1], I2C_MASTER_NACK);
        i2c_master_stop(cmd);
        esp_err_t ret = i2c_master_cmd_begin(I2C_MASTER_NUM, cmd, 1000 / portTICK_RATE_MS);
        i2c_cmd_link_delete(cmd);
        if (ret == ESP_ERR_TIMEOUT) {
            ESP_LOGE(TAG, "I2C timeout");
        } else if (ret != ESP_OK) {
            ESP_LOGE(TAG, "I2C read error");
        } else {
            int16_t value = (data[0] << 8) | data[1];
            ESP_LOGI(TAG, "Data: %d", value);
        }
        vTaskDelay(1000 / portTICK_RATE_MS);
    }
}

/**
 * @brief SPI master initialization
 */
static esp_err_t spi_master_init(void)
{
    esp_err_t ret;
    spi_bus_config_t buscfg = {
        .miso_io_num = SPI_MISO,
        .mosi_io_num = SPI_MOSI,
        .sclk_io_num = SPI_SCK,
        .quadwp_io_num = -1,
        .quadhd_io_num = -1,
        .max_transfer_sz = 0,
    };
    spi_device_interface_config_t devcfg = {
        .command_bits = 0,
        .address_bits = 0,
        .dummy_bits = 0,
        .mode = 0,
        .duty_cycle_pos = 128,
        .cs_ena_pretrans = 0,
        .cs_ena_posttrans = 0,
        .clock_speed_hz = 1000000,
        .input_delay_ns = 0,
        .spics_io_num = SPI_CS,
        .flags = 0,
        .queue_size = 1,
        .pre_cb = NULL,
        .post_cb = NULL,
        .hd_mode = false,
        .dma_chan = 1,
    };
    spi_device_handle_t spi;
    ret = spi_bus_initialize(SPI_BUS, &buscfg, 1);
    if (ret != ESP_OK) {
        return ret;
    }
    ret = spi_bus_add_device(SPI_BUS, &devcfg, &spi);
    if (ret != ESP_OK) {
        return ret;
    }
    return ESP_OK;
}

/**
 * @brief Write data to PCM1808
 */
static void pcm1808_write_task(void *arg)
{
    uint8_t tx_data[2] = {0x00, 0x00};
    while (1) {
        spi_transaction_t t;
        memset(&t, 0, sizeof(t));
        t.length = 16; // 16 bits
        t.tx_buffer = tx_data;
        spi_device_handle_t spi;
        esp_err_t ret = spi_bus_add_device(SPI_BUS, &devcfg, &spi);
        if (ret != ESP_OK) {
            ESP_LOGE(TAG, "SPI add device error");
            continue;
        }
        ret = spi_device_transmit(spi, &t);
        if (ret != ESP_OK) {
            ESP_LOGE(TAG, "SPI write error");
        }
        spi_bus_remove_device(spi);
        vTaskDelay(10 / portTICK_RATE_MS);
    }
}

void app_main()
{
    ESP_ERROR_CHECK(i2c_master_init());
    ESP_ERROR_CHECK(spi_master_init());
    xTaskCreate(pcm1808_read_task, "pcm1808_read_task", 4096, NULL, 2, NULL);
    xTaskCreate(pcm1808_write_task, "pcm1808_write_task", 4096, NULL, 2, NULL);
}

此示例使用了ESP32的I2C和SPI驱动程序来读取和写入PCM1808。注意，此代码只是一个简单的示例，实际应用中可能需要进行更多的初始化和配置，以及处理错误和异常情况。