杰理之打开MIC数据采样【篇】

struct adc_mic_ch user_mic;
struct audio_adc_output_hdl user_mic_output;
/----------------------------------------------------------------------------/
/**@brief MIC数据的回调
@param
@return
@note ： 默认统计最大/最小值/最大最小的差
/
/----------------------------------------------------------------------------*/
static void my_adc_output_to_enc(void *priv, s16 *data, int len)
{
//参数定义
#define CALC_DATA_SUM 16000 //多长时间更新一次数据

u16 points = len / 2; u16 index; static s32 min = 0xfffff; static s32 max = -100000; static s32 cnt_sum = 0; s32 db = 0; for (index = 0; index < points; index ++) { db = data[index]; cnt_sum++; if (cnt_sum > CALC_DATA_SUM) { printf("MAX : %d\tMIN : %d \t: %d\n",max,min,max-min); cnt_sum = 0; min = 0xfffff; max = -100000; } if (min > db) min = db; if (max < db) max = db; }

}

/----------------------------------------------------------------------------/
/**@brief 打开MIC
@param
@return
@note ： audio_mic_open 另外两个传参为 采样率 和 MIC增益
/
/----------------------------------------------------------------------------*/
void user_mic_open(void)
{
user_mic_output.handler = my_adc_output_to_enc;
user_mic_output.priv = NULL;
if (audio_mic_open(&user_mic, 16000,0) == 0) {
audio_mic_add_output(&user_mic_output);
audio_mic_start(&user_mic);
}
}

/----------------------------------------------------------------------------/
/**@brief 关闭MIC
@param
@return
@note
/
/----------------------------------------------------------------------------*/
void user_mic_close(void)
{
audio_mic_close(&user_mic, &user_mic_output);
}