nrf52832做蓝牙麦克风代码

以下是nrf52832蓝牙麦克风的代码示例：

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "nrf_delay.h"
#include "nrf_gpio.h"
#include "nrf_twi_mngr.h"
#include "nrf_drv_saadc.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "nrf_drv_gpiote.h"
#include "nrf_drv_uart.h"

#define SAMPLES_IN_BUFFER 1
#define TWI_INSTANCE_ID     0
#define BUTTON_PIN          NRF_GPIO_PIN_MAP(0,18)
#define LED_PIN             NRF_GPIO_PIN_MAP(0,19)
#define UART_TX_PIN         NRF_GPIO_PIN_MAP(0,20)
#define UART_RX_PIN         NRF_GPIO_PIN_MAP(0,21)

static nrf_twi_mngr_t m_nrf_twi_mngr = NRF_TWI_MNGR_INSTANCE(TWI_INSTANCE_ID);
static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0);
static nrf_saadc_value_t m_buffer_pool[2][SAMPLES_IN_BUFFER];
static uint32_t m_adc_evt_counter;
static bool button_pressed = false;

static void saadc_sampling_event_init(void);
static void saadc_sampling_event_enable(void);
static void timer_handler(nrf_timer_event_t event_type, void * p_context);
static void uart_init(void);
static void uart_send_string(const char *str);

int main(void)
{
    uint32_t err_code;
    uint8_t addr = 0x34;  // I2C address of the microphone
    nrf_saadc_channel_config_t channel_config =
        NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);

    nrf_gpio_cfg_output(LED_PIN);
    nrf_gpio_pin_set(LED_PIN);

    err_code = nrf_drv_ppi_init();
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_timer_init(&m_timer, NULL, timer_handler);
    APP_ERROR_CHECK(err_code);

    nrf_drv_timer_extended_compare(&m_timer,
                                   NRF_TIMER_CC_CHANNEL0,
                                   nrf_drv_timer_us_to_ticks(&m_timer, 500),
                                   NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
                                   true);

    nrf_drv_gpiote_init();

    nrf_drv_gpiote_in_config_t button_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(true);
    err_code = nrf_drv_gpiote_in_init(BUTTON_PIN, &button_config, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_gpiote_in_event_enable(BUTTON_PIN, true);

    err_code = nrf_drv_saadc_init(NULL, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_saadc_channel_init(0, &channel_config);

    nrf_drv_saadc_buffer_convert(m_buffer_pool[0], SAMPLES_IN_BUFFER);
    nrf_drv_saadc_buffer_convert(m_buffer_pool[1], SAMPLES_IN_BUFFER);

    saadc_sampling_event_init();
    saadc_sampling_event_enable();

    uart_init();

    while (true)
    {
        if (button_pressed)
        {
            nrf_gpio_pin_toggle(LED_PIN);

            uint8_t tx_data[3] = {0x06, 0x10, 0x3f};  // Start continuous conversion command
            nrf_twi_mngr_transfer_t const write_transfer[] =
            {
                NRF_TWI_MNGR_WRITE(addr, tx_data, sizeof(tx_data), 0),
            };
            err_code = nrf_twi_mngr_perform(&m_nrf_twi_mngr, NULL, write_transfer, 1, NULL);
            APP_ERROR_CHECK(err_code);

            nrf_delay_ms(500);

            uint8_t rx_data[2];
            nrf_twi_mngr_transfer_t const read_transfer[] =
            {
                NRF_TWI_MNGR_READ(addr, rx_data, sizeof(rx_data), 0),
            };
            err_code = nrf_twi_mngr_perform(&m_nrf_twi_mngr, NULL, read_transfer, 1, NULL);
            APP_ERROR_CHECK(err_code);

            int16_t value = (rx_data[0] << 8) | rx_data[1];
            char str[32];
            snprintf(str, sizeof(str), "ADC Value: %d\r\n", value);
            uart_send_string(str);

            button_pressed = false;
        }
    }
}

static void saadc_sampling_event_init(void)
{
    ret_code_t err_code;

    err_code = nrf_drv_ppi_channel_alloc(&m_ppi_channel);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_ppi_channel_assign(m_ppi_channel,
                                          nrf_drv_saadc_event_address_get(NRF_DRV_SAADC_EVT_DONE),
                                          nrf_drv_timer_task_address_get(&m_timer, NRF_TIMER_TASK_CAPTURE0));
    APP_ERROR_CHECK(err_code);
}

static void saadc_sampling_event_enable(void)
{
    ret_code_t err_code = nrf_drv_ppi_channel_enable(m_ppi_channel);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_sample();
    APP_ERROR_CHECK(err_code);
}

static void timer_handler(nrf_timer_event_t event_type, void * p_context)
{
}

static void uart_init(void)
{
    ret_code_t err_code;

    nrf_drv_uart_config_t uart_config = NRF_DRV_UART_DEFAULT_CONFIG;
    uart_config.baudrate = NRF_UART_BAUDRATE_115200;
    uart_config.tx_pin = UART_TX_PIN;
    uart_config.rx_pin = UART_RX_PIN;

    err_code = nrf_drv_uart_init(&uart_config, NULL);
    APP_ERROR_CHECK(err_code);
}

static void uart_send_string(const char *str)
{
    for (int i = 0; str[i] != '\0'; i++)
    {
        while (nrf_drv_uart_tx(&m_uart, (uint8_t const *)&str[i], 1) != NRF_SUCCESS)
        {
            // Do nothing.
        }
    }
}

void GPIOTE_IRQHandler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    if (pin == BUTTON_PIN && action == NRF_GPIOTE_POLARITY_HITOLO)
    {
        button_pressed = true;
    }
}

这个代码实现了以下功能：

1. 初始化nrf52832的GPIO，定时器，PPI，ADC和UART模块。
2. 配置GPIOTE中断，当按下按键时，设置标志变量button_pressed为true。
3. 在主循环中，当button_pressed为true时，向麦克风发送启动连续转换命令，读取麦克风ADC的值，并通过UART将其发送到串口终端。

请注意，这只是一个简单的示例代码，实际应用中可能需要进行更多的配置和优化。