/*********************************************************************//**
* @brief I2S IRQ Handler
* @param[in] None
* @return None
**********************************************************************/
void I2S_IRQHandler()
{
uint32_t RXLevel = 0;
//Check RX interrupt
if(I2S_GetIRQStatus(LPC_I2S, I2S_RX_MODE))
{
RXLevel = I2S_GetLevel(LPC_I2S, I2S_RX_MODE);
if ( (RXLevel != RXFIFO_EMPTY) && !I2SRXDone )
{
while ( RXLevel > 0 )
{
if ( I2SReadLength == BUFFER_SIZE )
{
//Stop RX
I2S_Stop(LPC_I2S, I2S_RX_MODE);
// Disable RX
I2S_IRQCmd(LPC_I2S, I2S_RX_MODE, DISABLE);
I2SRXDone = 1;
break;
}
else
{
I2SRXBuffer[I2SReadLength++] = LPC_I2S->I2SRXFIFO;
}
RXLevel--;
}
}
}
return;
}
/*******************************************************************************
* Function Name: I2S_Sleep
********************************************************************************
*
* Summary:
* Prepares I2S goes to sleep.
*
* Parameters:
* None.
*
* Return:
* None.
*
* Global Variables:
* I2S_backup - modified when non-retention registers are saved.
*
* Reentrant:
* No.
*
*******************************************************************************/
void I2S_Sleep(void)
{
/* Get component state */
I2S_backup.enableState = ((uint8) I2S_IS_ENABLE);
/* Save registers configuration */
I2S_SaveConfig();
/* Stop component */
I2S_Stop();
}
/**
* @brief I2S_Freq_Config 根据采样频率配置iis总线，在播放音频文件时可从文件中解码获取
* @param SampleFreq 采样频率
* @retval none
*/
void I2S_Freq_Config(uint16_t SampleFreq)
{
I2S_InitTypeDef I2S_InitStructure;
I2S_Stop();
I2S_InitStructure.I2S_Mode = I2S_Mode_MasterTx; // 配置I2S工作模式
I2S_InitStructure.I2S_Standard = I2S_Standard_LSB; // 接口标准
I2S_InitStructure.I2S_DataFormat = I2S_DataFormat_16b; // 数据格式，16bit
I2S_InitStructure.I2S_MCLKOutput = I2S_MCLKOutput_Enable; // 主时钟模式
I2S_InitStructure.I2S_AudioFreq = SampleFreq; // 音频采样频率
I2S_InitStructure.I2S_CPOL = I2S_CPOL_Low;
I2S_Init(SPI2, &I2S_InitStructure);
I2S_Cmd(SPI2, ENABLE); //使能iis总线
}
void Audio_Init(uint32_t samplefreq)
{
I2S_MODEConf_Type I2S_ClkConfig;
I2S_CFG_Type I2S_ConfigStruct;
Audio_Reset_Data_Buffer();
NVIC_DisableIRQ(I2SIRQ);
switch(samplefreq){
case 11025:
case 22050:
case 44100:
audio_buffer_size = 1764;
break;
case 8000:
case 16000:
case 32000:
case 48000:
default:
audio_buffer_size = samplefreq * 4 * AUDIO_MAX_PC / 1000;
break;
}
/* Reset UDA1380 on board Hitex */
// scu_pinmux(8,2,MD_PUP, FUNC0);
// GPIO_SetDir(4, 1<<2, 1);
// GPIO_ClearValue(4, 1<<2);
/* Initialize I2S peripheral ------------------------------------*/
/* Init I2C */
I2C_Init(LPC_I2C, 100000);
/* Enable Slave I2C operation */
I2C_Cmd(LPC_I2C, ENABLE);
/* Init UDA1380 CODEC */
UDA1380_init();
/* Initialize I2S peripheral ------------------------------------*/
scu_pinmux(6,0, MD_PUP, 4); // I2S_RX_SCK
scu_pinmux(6,1, MD_PUP, 3); // I2S_RX_WS
scu_pinmux(6,2, MD_PUP, 3); // I2S_RX_SDA
scu_pinmux(3,0, MD_PUP, 2); // I2S_TX_SCK
scu_pinmux(3,1, MD_PUP, 0); // I2S_TX_WS
scu_pinmux(3,2, MD_PUP, 0); // I2S_TX_SDA
I2S_Init(I2S);
/* setup:
* - wordwidth: 16 bits
* - stereo mode
* - master mode for I2S_TX
* - Frequency = 44.1 kHz
*/
/* Audio Config*/
I2S_ConfigStruct.wordwidth = I2S_WORDWIDTH_16;
I2S_ConfigStruct.mono = I2S_STEREO;
I2S_ConfigStruct.stop = I2S_STOP_ENABLE;
I2S_ConfigStruct.reset = I2S_RESET_ENABLE;
I2S_ConfigStruct.ws_sel = I2S_MASTER_MODE;
I2S_ConfigStruct.mute = I2S_MUTE_DISABLE;
I2S_Config(I2S,I2S_TX_MODE,&I2S_ConfigStruct);
/* Clock Mode Config*/
I2S_ClkConfig.clksel = I2S_CLKSEL_FRDCLK;
I2S_ClkConfig.fpin = I2S_4PIN_DISABLE;
I2S_ClkConfig.mcena = I2S_MCLK_DISABLE;
I2S_ModeConfig(I2S,&I2S_ClkConfig,I2S_TX_MODE);
I2S_FreqConfig(I2S, samplefreq, I2S_TX_MODE);
I2S_Stop(I2S, I2S_TX_MODE);
/* TX FIFO depth is 4 */
I2S_IRQConfig(I2S,I2S_TX_MODE,I2S_TX_LEVEL);
I2S_IRQCmd(I2S,I2S_TX_MODE,ENABLE);
I2S_Start(I2S);
NVIC_EnableIRQ(I2SIRQ);
}
/*********************************************************************//**
* @brief c_entry: Main program body
* @param[in] None
* @return int
**********************************************************************/
int c_entry (void) { /* Main Program */
I2S_MODEConf_Type I2S_ClkConfig;
I2S_CFG_Type I2S_ConfigStruct;
PINSEL_CFG_Type PinCfg;
uint32_t i;
/* Initialize debug via UART0
* – 115200bps
* – 8 data bit
* – No parity
* – 1 stop bit
* – No flow control
*/
debug_frmwrk_init();
//print menu screen
print_menu();
/* Initialize I2S peripheral ------------------------------------*/
/* Pin configuration:
* Assign: - P0.4 as I2SRX_CLK
* - P0.5 as I2SRX_WS
* - P0.6 as I2SRX_SDA
* - P0.7 as I2STX_CLK
* - P0.8 as I2STX_WS
* - P0.9 as I2STX_SDA
*/
PinCfg.Funcnum = 1;
PinCfg.OpenDrain = 0;
PinCfg.Pinmode = 0;
PinCfg.Pinnum = 4;
PinCfg.Portnum = 0;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 5;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 6;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 7;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 8;
PINSEL_ConfigPin(&PinCfg);
PinCfg.Pinnum = 9;
PINSEL_ConfigPin(&PinCfg);
Buffer_Init();
I2S_Init(LPC_I2S);
/* setup:
* - wordwidth: 16 bits
* - stereo mode
* - master mode for I2S_TX and slave for I2S_RX
* - ws_halfperiod is 31
* - not use mute mode
* - use reset and stop mode
* - select the fractional rate divider clock output as the source,
* - disable 4-pin mode
* - MCLK ouput is disable
* - Frequency = 44.1 kHz
* Because we use mode I2STXMODE[3:0]= 0000, I2SDAO[5]=0 and
* I2SRX[3:0]=0000, I2SDAI[5] = 1. So we have I2SRX_CLK = I2STX_CLK
* --> I2SRXBITRATE = 1 (not divide TXCLK to produce RXCLK)
*/
/* Audio Config*/
I2S_ConfigStruct.wordwidth = I2S_WORDWIDTH_16;
I2S_ConfigStruct.mono = I2S_STEREO;
I2S_ConfigStruct.stop = I2S_STOP_ENABLE;
I2S_ConfigStruct.reset = I2S_RESET_ENABLE;
I2S_ConfigStruct.ws_sel = I2S_MASTER_MODE;
I2S_ConfigStruct.mute = I2S_MUTE_DISABLE;
I2S_Config(LPC_I2S,I2S_TX_MODE,&I2S_ConfigStruct);
I2S_ConfigStruct.ws_sel = I2S_SLAVE_MODE;
I2S_Config(LPC_I2S,I2S_RX_MODE,&I2S_ConfigStruct);
/* Clock Mode Config*/
I2S_ClkConfig.clksel = I2S_CLKSEL_FRDCLK;
I2S_ClkConfig.fpin = I2S_4PIN_DISABLE;
I2S_ClkConfig.mcena = I2S_MCLK_DISABLE;
I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_TX_MODE);
I2S_ModeConfig(LPC_I2S,&I2S_ClkConfig,I2S_RX_MODE);
I2S_FreqConfig(LPC_I2S, 44100, I2S_TX_MODE);
I2S_SetBitRate(LPC_I2S, 0, I2S_RX_MODE);
I2S_Stop(LPC_I2S, I2S_TX_MODE);
I2S_Stop(LPC_I2S, I2S_RX_MODE);
NVIC_EnableIRQ(I2S_IRQn);
/* RX FIFO depth is 1, TX FIFO depth is 8. */
I2S_IRQConfig(LPC_I2S,I2S_TX_MODE,8);
I2S_IRQConfig(LPC_I2S,I2S_RX_MODE,1);
I2S_IRQCmd(LPC_I2S,I2S_RX_MODE,ENABLE);
I2S_Start(LPC_I2S);
/* I2S transmit ---------------------------------------------------*/
while ( I2SWriteLength < BUFFER_SIZE )
{
while(I2S_GetLevel(LPC_I2S, I2S_TX_MODE)==TXFIFO_FULL);
I2S_Send(LPC_I2S, I2STXBuffer[I2SWriteLength++]);
}
I2STXDone = 1;
/* Wait for transmit/receive complete */
while ( !I2SRXDone || !I2STXDone );
for(i=0;i<BUFFER_SIZE;i++)
{
_DBH32(I2SRXBuffer[i]);_DBG_("");
}
/* Verify RX and TX Buffer */
if(Buffer_Verify())
{
_DBG_("Verify Buffer: OK...");
}
else
{
_DBG_("Verify Buffer: ERROR...");
}
return 0;
}
/**
* @brief wav_player 进行wav文件播放
* wav格式存储的就是PCM数据，不需要解码
* @param filename:要播放的文件路径
* @retval none
*/
static void wav_player(const char *filename)
{
short *p;
WavHead *wav;
//打开音频文件
fres = f_open (&file, filename, FA_READ );
//打开失败
if (fres!=FR_OK)
{
printf("read file %s error ! open another file\r\n",filename);
fres = f_close (&file);
if (++play_index>=file_num) //索引值加1
{
play_index=0; //归0，所以如果所有文件都打开失败会一直循环
}
return ; //文件无法打开，终止解码。进入下一次循环，读取下一个文件
}
//显示播放图标
Lcd_GramScan(1);
LCD_Clear(12,88,8,145,BACKGROUND);
Lcd_show_bmp(320-(103+((play_index-((current_page-1)*8))*18)),240-20,"/mp3player/ui_playing.bmp");
fres = f_read(&file,buffer,512,&rw_num); //读取文件头
wav = (WavHead *)buffer; //整理格式
printf("\r\n samprate: %dHz", wav->dwSamplesPerSec); //采样率
if(wav->dwSamplesPerSec >= I2S_AudioFreq_Default)
I2S_Freq_Config(wav->dwSamplesPerSec); //设置采样率
//播放循环
while(player_state != S_SWITCH) //循环本过程播放音频，直到切歌
{
if (player_state == S_STOP)
{
even_process();
continue; //暂停的时候跳出本循环
}
player_state = S_PLAY; //状态更新为正在播放
//读取wav文件
p = (short *)(buffer+sizeof(buffer)/2*bufflag);
fres = f_read(&file, p, sizeof(buffer)/2, &rw_num);
if(fres != FR_OK)
{
printf("读取%s失败！ %d\r\n",filename,fres);
break;
}
/* 等待DMA播放完，这段时间我们可以干其他的事，事件处理 */
while((DMA1_Channel5->CCR & DMA_CCR1_EN) && !(DMA1->ISR&DMA1_IT_TC5))
{
even_process();
}
DMA_ClearFlag(DMA1_FLAG_TC5 | DMA1_FLAG_TE5);
DMA_I2S_Configuration((uint32_t)p, rw_num/2);
bufflag = 1 -bufflag; //切换buffer
if(file.fptr==file.fsize) //如果指针指向了文件尾，表示数据全部读完
{
printf("END\r\n");
if(play_index<file_num-1) //自动开始下一首歌曲
{
play_index++;
player_state = S_SWITCH;
}
else
{
play_index = 0;
player_state = S_SWITCH;
}
break; //跳出这首歌的播放状态 while break;
}
}
f_close(&file); //结束播放本歌曲，关闭文件
I2S_Stop();
}
/**
* @brief mp3_player 进行mp3文件解码、播放
* @param filename:要播放的文件路径
* @retval none
*/
static void mp3_player(const char *filename)
{
int err, i, outputSamps, current_sample_rate = 0;
int read_offset = 0; /* 读偏移指针 */
int bytes_left = 0; /* 剩余字节数 */
unsigned long Frames = 0; /* mP3帧计数 */
unsigned char *read_ptr = buffer; /* 缓冲区指针 */
HMP3Decoder Mp3Decoder; /* mp3解码器指针 */
//打开音频文件
fres = f_open (&file, filename, FA_READ );
//打开失败
if (fres!=FR_OK)
{
printf("read file %s error ! open another file\r\n",filename);
fres = f_close (&file);
if (++play_index>=file_num) //索引值加1
{
play_index=0; //归0，所以如果所有文件都打开失败会一直循环
}
return ; //文件无法打开，终止解码。进入下一次循环，读取下一个文件
}
//打开成功
//初始化MP3解码器
Mp3Decoder = MP3InitDecoder();
//获取输入数据流，调用helix库解码，输出PCM数据，约20ms完成一次循环
//开始进入播放状态,期间中断会修改touch_even状态
while(player_state != S_SWITCH) //循环1， 如果touch_even不是切歌状态则继续呆在循环体里
{
//有时出现解码错误，错误后继续在本循环体内，继续播放
//显示播放图标
Lcd_GramScan(1);
LCD_Clear(12,88,8,145,BACKGROUND);
Lcd_show_bmp(320-(103+((play_index-((current_page-1)*8))*18)),240-20,"/mp3player/ui_playing.bmp");
//读取mp3文件
fres = f_read(&file, buffer, sizeof(buffer), &rw_num);
if(fres != FR_OK)
{
printf("读取%s失败！ %d\r\n",filename,fres);
break;
//return;
}
read_ptr = buffer; //指向mp3输入流
bytes_left = rw_num; //实际读到的输入流大小大小
//按帧处理
while(player_state != S_SWITCH) //循环2，循环本过程播放音频，直到按了下一首、上一首
{
if (player_state == S_STOP)
{
even_process(); //检查是否有事件需要处理
continue; //暂停的时候结束本次循环
}
player_state = S_PLAY; //状态更新为正在播放
read_offset = MP3FindSyncWord(read_ptr, bytes_left); //寻找帧同步，返回第一个同步字的位置
if(read_offset < 0) //没有找到同步字
{
break; //跳出循环2，回到循环1
}
read_ptr += read_offset; //偏移至同步字的位置
bytes_left -= read_offset; //同步字之后的数据大小
if(bytes_left < 1024) //补充数据
{
/* 注意这个地方因为采用的是DMA读取，所以一定要4字节对齐 */
i=(uint32_t)(bytes_left)&3; //判断多余的字节
if(i) i=4-i; //需要补充的字节
memcpy(buffer+i, read_ptr, bytes_left); //从对齐位置开始复制
read_ptr = buffer+i; //指向数据对齐位置
fres = f_read(&file, buffer+bytes_left+i, sizeof(buffer)-bytes_left-i, &rw_num);//补充数据
bytes_left += rw_num; //有效数据流大小
}
err = MP3Decode(Mp3Decoder, &read_ptr, &bytes_left, outBuf[bufflag], 0); //开始解码 参数：mp3解码结构体、输入流指针、输入流大小、输出流指针、数据格式
Frames++;
if (err != ERR_MP3_NONE) //错误处理
{
switch (err)
{
case ERR_MP3_INDATA_UNDERFLOW:
printf("ERR_MP3_INDATA_UNDERFLOW\r\n");
read_ptr = buffer;
fres = f_read(&file, read_ptr, sizeof(buffer), &rw_num);
bytes_left = rw_num;
break;
case ERR_MP3_MAINDATA_UNDERFLOW:
/* do nothing - next call to decode will provide more mainData */
printf("ERR_MP3_MAINDATA_UNDERFLOW\r\n");
break;
default:
printf("UNKNOWN ERROR:%d\r\n", err);
// 跳过此帧
if (bytes_left > 0)
{
bytes_left --;
read_ptr ++;
}
break;
}
}
else //解码无错误，准备把数据输出到PCM
{
MP3GetLastFrameInfo(Mp3Decoder, &Mp3FrameInfo); //获取解码信息
/* 根据解码信息设置采样率 */
if (Mp3FrameInfo.samprate != current_sample_rate) //采样率
{
current_sample_rate = Mp3FrameInfo.samprate;
printf(" \r\n Bitrate %dKbps", Mp3FrameInfo.bitrate/1000);
printf(" \r\n Samprate %dHz", current_sample_rate);
printf(" \r\n BitsPerSample %db", Mp3FrameInfo.bitsPerSample);
printf(" \r\n nChans %d", Mp3FrameInfo.nChans);
printf(" \r\n Layer %d", Mp3FrameInfo.layer);
printf(" \r\n Version %d", Mp3FrameInfo.version);
printf(" \r\n OutputSamps %d", Mp3FrameInfo.outputSamps);
if(current_sample_rate >= I2S_AudioFreq_Default) //I2S_AudioFreq_Default = 2，正常的帧，每次都要改速率
{
I2S_Freq_Config(current_sample_rate); //根据采样率修改iis速率
}
}
/* 输出到DAC */
outputSamps = Mp3FrameInfo.outputSamps; //PCM数据个数
if (outputSamps > 0)
{
if (Mp3FrameInfo.nChans == 1) //单声道
{
//单声道数据需要复制一份到另一个声道
for (i = outputSamps - 1; i >= 0; i--)
{
outBuf[bufflag][i * 2] = outBuf[bufflag][i];
outBuf[bufflag][i * 2 + 1] = outBuf[bufflag][i];
}
outputSamps *= 2;
}
//非单声道数据可直接由DMA传输到IIS交给DAC
/* 等待DMA播放完，这段时间我们可以干其他的事，扫描事件进行处理 */
while((DMA1_Channel5->CCR&DMA_CCR1_EN) && !(DMA1->ISR&DMA1_IT_TC5))
{
even_process();
}
/*DMA传输完毕*/
DMA_ClearFlag(DMA1_FLAG_TC5 | DMA1_FLAG_TE5);
DMA_I2S_Configuration((uint32_t)outBuf[bufflag], outputSamps);
bufflag = 1 -bufflag; //切换buffer
}//if (outputSamps > 0)
}//else 解码正常
if(file.fptr==file.fsize) //如果指针指向了文件尾，表示数据全部读完
{
printf("END\r\n");
if(play_index<file_num-1) //自动开始下一首歌曲
{
play_index++;
player_state = S_SWITCH; //进入切歌状态，跳出
}
else
{
play_index = 0;
player_state = S_SWITCH;
}
break; //跳出这首歌的播放状态 while break;
}
}//循环2 内 while(player_state != S_SWITCH)
}//循环1 外 while(player_state != S_SWITCH)
f_close(&file); //结束播放本歌曲，关闭文件
MP3FreeDecoder(Mp3Decoder);
I2S_Stop();
}
