void I2S1_IRQHandler(void)
{
uint32_t u32Reg;
uint32_t u32Len, i;
uint32_t *pBuffTx, *pBuffRx;
// enable sound output
PA4 = 0;
u32Reg = I2S_GET_INT_FLAG(I2S1, I2S_STATUS_TXIF_Msk | I2S_STATUS_RXIF_Msk);
if (u32Reg & I2S_STATUS_TXIF_Msk) {
pBuffTx = &PcmBuff[0];
/* Read Tx FIFO free size */
u32Len = 8 - I2S_GET_TX_FIFO_LEVEL(I2S1);
if (u32BuffPos >= 8) {
for (i = 0; i < u32Len; i++) {
I2S_WRITE_TX_FIFO(I2S1, pBuffTx[i]);
}
for (i = 0; i < BUFF_LEN - u32Len; i++) {
pBuffTx[i] = pBuffTx[i + u32Len];
}
u32BuffPos -= u32Len;
} else {
for (i = 0; i < u32Len; i++) {
I2S_WRITE_TX_FIFO(I2S1, 0x00);
}
}
}
if (u32Reg & I2S_STATUS_RXIF_Msk) {
if (u32BuffPos < (BUFF_LEN-8)) {
pBuffRx = &PcmBuff[u32BuffPos];
/* Read Rx FIFO Level */
u32Len = I2S_GET_RX_FIFO_LEVEL(I2S1);
for ( i = 0; i < u32Len; i++ ) {
pBuffRx[i] = I2S_READ_RX_FIFO(I2S1);
}
u32BuffPos += u32Len;
if (u32BuffPos >= BUFF_LEN) {
u32BuffPos = 0;
}
}
}
}
/*---------------------------------------------------------------------------------------------------------*/
int32_t main(void)
{
int32_t i;
/*
This sample code is used to demo USB Audio Class + NAU8822.
User can define PLAY_RATE in usbd_audio.h to support 48000Hz, 32000Hz, 16000Hz and 8000Hz.
The audio is input from NAU8822 AUXIN.
The audio is output by NAU8822 Headphone output.
NAU8822 is connect with I2S1 (PA.4~PA.7) and controlled by I2C0 (PD.4, PD.5).
NAU8822 clock source is also come from I2S1 (MCLK, PD.0).
PC.1 is used to output clock (HCLK/8) to check HCLK frequency.
*/
/* Unlock Protected Regsiter */
SYS_UnlockReg();
/* Initial system & multi-function */
SYS_Init();
/* Initial UART0 for debug message */
UART0_Init();
printf("\n");
printf("+-------------------------------------------------------+\n");
printf("| NuMicro USB Audio CODEC Sample Code |\n");
printf("+-------------------------------------------------------+\n");
/* Init I2C0 to access NAU8822 */
I2C0_Init();
/* Initialize NAU8822 codec */
WAU8822_Setup();
I2S_Open(SPI1, I2S_MODE_SLAVE, PLAY_RATE, I2S_DATABIT_16, I2S_STEREO, I2S_FORMAT_I2S);
/* Set MCLK and enable MCLK */
I2S_EnableMCLK(SPI1, 12000000);
/* Fill dummy data to I2S TX for start I2S iteration */
for(i = 0; i < 4; i++)
I2S_WRITE_TX_FIFO(SPI1, 0);
/* Start I2S play iteration */
I2S_EnableInt(SPI1, I2S_FIFO_TXTH_INT_MASK | I2S_FIFO_RXTH_INT_MASK);
USBD_Open(&gsInfo, UAC_ClassRequest, (SET_INTERFACE_REQ)UAC_SetInterface);
/* Endpoint configuration */
UAC_Init();
USBD_Start();
NVIC_EnableIRQ(USBD_IRQn);
NVIC_EnableIRQ(SPI1_IRQn);
/* SPI (I2S) interrupt has higher frequency then USBD interrupt.
Therefore, we need to set SPI (I2S) with higher priority to avoid
SPI (I2S) interrupt pending too long time when USBD interrupt happen. */
NVIC_SetPriority(USBD_IRQn, 3);
NVIC_SetPriority(SPI1_IRQn, 2);
while(SYS->PDID)
{
uint8_t ch;
uint32_t u32Reg, u32Data;
extern int32_t kbhit(void);
/* Adjust codec sampling rate to synch with USB. The adjustment range is +-0.005% */
AdjFreq();
/* Set audio volume according USB volume control settings */
VolumnControl();
/* User can change audio codec settings by I2C at run-time if necessary */
if(!kbhit())
{
printf("\nEnter codec setting:\n");
// Get Register number
ch = getchar();
u32Reg = ch - '0';
ch = getchar();
u32Reg = u32Reg * 10 + (ch - '0');
printf("%d\n", u32Reg);
// Get data
ch = getchar();
u32Data = (ch >= '0' && ch <= '9') ? ch - '0' : ch - 'a' + 10;
ch = getchar();
u32Data = u32Data * 16 + ((ch >= '0' && ch <= '9') ? ch - '0' : ch - 'a' + 10);
ch = getchar();
u32Data = u32Data * 16 + ((ch >= '0' && ch <= '9') ? ch - '0' : ch - 'a' + 10);
printf("%03x\n", u32Data);
I2C_WriteWAU8822(u32Reg, u32Data);
}
}
}