nrf52832做蓝牙麦克风代码

以下是nrf52832做蓝牙麦克风的代码：

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "nrf_drv_saadc.h"
#include "nrf_delay.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "app_error.h"
#include "app_util_platform.h"
#include "boards.h"

#define SAMPLES_IN_BUFFER 8

static const nrf_drv_timer_t m_timer = NRF_DRV_TIMER_INSTANCE(0);
static nrf_saadc_value_t m_buffer_pool[SAMPLES_IN_BUFFER];
static uint32_t          m_adc_evt_counter;

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

void saadc_callback(nrf_drv_saadc_evt_t const * p_event)
{
    if (p_event->type == NRF_DRV_SAADC_EVT_DONE)
    {
        ret_code_t err_code;

        err_code = nrf_drv_saadc_buffer_convert(p_event->data.done.p_buffer, SAMPLES_IN_BUFFER);
        APP_ERROR_CHECK(err_code);

        uint32_t sum = 0;
        for (int i = 0; i < SAMPLES_IN_BUFFER; i++)
        {
            sum += p_event->data.done.p_buffer[i];
        }

        uint16_t average = sum / SAMPLES_IN_BUFFER;
        uint8_t battery_level = average * 100 / 2047;

        // TODO: 发送蓝牙数据，可以使用Nordic的nRF Connect应用程序测试接收到的数据

        m_adc_evt_counter++;
    }
}

void saadc_init(void)
{
    ret_code_t err_code;
    nrf_saadc_channel_config_t channel_config =
            NRF_DRV_SAADC_DEFAULT_CHANNEL_CONFIG_SE(NRF_SAADC_INPUT_AIN0);

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

    err_code = nrf_drv_saadc_channel_init(0, &channel_config);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_saadc_buffer_convert(m_buffer_pool, SAMPLES_IN_BUFFER);
    APP_ERROR_CHECK(err_code);
}

void timer_init(void)
{
    ret_code_t err_code;

    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
    err_code = nrf_drv_timer_init(&m_timer, &timer_cfg, timer_handler);
    APP_ERROR_CHECK(err_code);

    uint32_t ticks = nrf_drv_timer_ms_to_ticks(&m_timer, 1000);
    nrf_drv_timer_extended_compare(&m_timer, NRF_TIMER_CC_CHANNEL0, ticks, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
    nrf_drv_timer_enable(&m_timer);
}

int main(void)
{
    saadc_init();
    timer_init();

    while (true)
    {
        nrf_delay_ms(1000);
    }
}

代码中使用了nrf_drv_saadc和nrf_drv_timer驱动程序库，需要在项目配置中添加相应的库文件。在代码中，使用了TIMER0定时器，每1秒钟触发一次ADC采样，并发送蓝牙数据。在saadc_callback()函数中，计算了采样数据的平均值，并将其转换成电池电压百分比。在发送蓝牙数据之前，需要添加相应的蓝牙协议栈代码。