/**
* @brief Initializes wave recording.
* @param AudioFreq: Audio frequency to be configured for the I2S peripheral.
* @param BitRes: Audio frequency to be configured for the I2S peripheral.
* @param ChnlNbr: Audio frequency to be configured for the I2S peripheral.
* @retval AUDIO_OK if correct communication, else wrong communication
*/
uint8_t BSP_AUDIO_IN_Init(uint32_t AudioFreq, uint32_t BitRes, uint32_t ChnlNbr)
{
RCC_PeriphCLKInitTypeDef rccclkinit;
/* Enable PLLI2S clock */
HAL_RCCEx_GetPeriphCLKConfig(&rccclkinit);
/* PLLI2S_VCO Input = HSE_VALUE/PLL_M = 1 Mhz */
if ((AudioFreq & 0x7) == 0)
{
/* Audio frequency multiple of 8 (8/16/32/48/96/192)*/
/* PLLI2S_VCO Output = PLLI2S_VCO Input * PLLI2SN = 192 Mhz */
/* I2SCLK = PLLI2S_VCO Output/PLLI2SR = 192/6 = 32 Mhz */
rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
rccclkinit.PLLI2S.PLLI2SN = 192;
rccclkinit.PLLI2S.PLLI2SR = 6;
HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
}
else
{
/* Other Frequency (11.025/22.500/44.100) */
/* PLLI2S_VCO Output = PLLI2S_VCO Input * PLLI2SN = 290 Mhz */
/* I2SCLK = PLLI2S_VCO Output/PLLI2SR = 290/2 = 145 Mhz */
rccclkinit.PeriphClockSelection = RCC_PERIPHCLK_I2S;
rccclkinit.PLLI2S.PLLI2SN = 290;
rccclkinit.PLLI2S.PLLI2SR = 2;
HAL_RCCEx_PeriphCLKConfig(&rccclkinit);
}
/* Configure the PDM library */
PDMDecoder_Init(AudioFreq, ChnlNbr);
/* Configure the I2S2 */
I2S2_Init(AudioFreq);
/* Return AUDIO_OK when all operations are correctly done */
return AUDIO_OK;
}
//播放某个WAV文件
//fname:wav文件路径.
//返回值:
//KEY0_PRES:下一曲
//KEY1_PRES:上一曲
//其他:错误
u8 wav_play_song(u8* fname)
{
u8 key;
u8 t=0;
u8 res;
u32 fillnum;
audiodev.file=(FIL*)mymalloc(SRAMIN,sizeof(FIL));
audiodev.i2sbuf1=mymalloc(SRAMIN,WAV_I2S_TX_DMA_BUFSIZE);
audiodev.i2sbuf2=mymalloc(SRAMIN,WAV_I2S_TX_DMA_BUFSIZE);
audiodev.tbuf=mymalloc(SRAMIN,WAV_I2S_TX_DMA_BUFSIZE);
if(audiodev.file&&audiodev.i2sbuf1&&audiodev.i2sbuf2&&audiodev.tbuf)
{
res=wav_decode_init(fname,&wavctrl);//得到文件的信息
if(res==0)//解析文件成功
{
if(wavctrl.bps==16)
{
WM8978_I2S_Cfg(2,0); //飞利浦标准,16位数据长度
I2S2_Init(0,2,0,0); //飞利浦标准,主机发送,时钟低电平有效,16位帧长度
}else if(wavctrl.bps==24)
{
WM8978_I2S_Cfg(2,2); //飞利浦标准,24位数据长度
I2S2_Init(0,2,0,2); //飞利浦标准,主机发送,时钟低电平有效,24位扩展帧长度
}
I2S2_SampleRate_Set(wavctrl.samplerate);//设置采样率
I2S2_TX_DMA_Init(audiodev.i2sbuf1,audiodev.i2sbuf2,WAV_I2S_TX_DMA_BUFSIZE/2); //配置TX DMA
i2s_tx_callback=wav_i2s_dma_tx_callback; //回调函数指wav_i2s_dma_callback
audio_stop();
res=f_open(audiodev.file,(TCHAR*)fname,FA_READ); //打开文件
if(res==0)
{
f_lseek(audiodev.file, wavctrl.datastart); //跳过文件头
fillnum=wav_buffill(audiodev.i2sbuf1,WAV_I2S_TX_DMA_BUFSIZE,wavctrl.bps);
fillnum=wav_buffill(audiodev.i2sbuf2,WAV_I2S_TX_DMA_BUFSIZE,wavctrl.bps);
audio_start();
while(res==0)
{
while(wavtransferend==0);//等待wav传输完成;
wavtransferend=0;
if(fillnum!=WAV_I2S_TX_DMA_BUFSIZE)//播放结束?
{
res=KEY0_PRES;
break;
}
if(wavwitchbuf)fillnum=wav_buffill(audiodev.i2sbuf2,WAV_I2S_TX_DMA_BUFSIZE,wavctrl.bps);//填充buf2
else fillnum=wav_buffill(audiodev.i2sbuf1,WAV_I2S_TX_DMA_BUFSIZE,wavctrl.bps);//填充buf1
while(1)
{
key=KEY_Scan(0);
if(key==WKUP_PRES)//暂停
{
if(audiodev.status&0X01)audiodev.status&=~(1<<0);
else audiodev.status|=0X01;
}
if(key==KEY2_PRES||key==KEY0_PRES)//下一曲/上一曲
{
res=key;
break;
}
wav_get_curtime(audiodev.file,&wavctrl);//得到总时间和当前播放的时间
audio_msg_show(wavctrl.totsec,wavctrl.cursec,wavctrl.bitrate);
t++;
if(t==20)
{
t=0;
LED0=!LED0;
}
if((audiodev.status&0X01)==0)delay_ms(10);
else break;
}
}
audio_stop();
}else res=0XFF;
}else res=0XFF;
}else res=0XFF;
myfree(SRAMIN,audiodev.tbuf); //释放内存
myfree(SRAMIN,audiodev.i2sbuf1);//释放内存
myfree(SRAMIN,audiodev.i2sbuf2);//释放内存
myfree(SRAMIN,audiodev.file); //释放内存
return res;
}