TI 工程师，
你们好，我现在又碰到了一个问题，non-DMA 的 I2S ，发数据的时候，只能发送前两个字节，两个字节之后I2SDataPutNonBlocking的返回值总是-1，应该表示buffer总是满的，为什么会出现这种情况啊？
unsigned long I2S_Xdata = 0;
void I2SIntHandler()
{
unsigned long ulStatus;
unsigned long ulDummy;
int iRetVal;
// Get the interrupt status
ulStatus = MAP_I2SIntStatus(I2S_BASE);
// UART_PRINT("====> I2SIntStatus = 0x%08x \n\r",ulStatus);
// Check if there was a Transmit interrupt; if so write next data into the tx buffer and acknowledge
// the interrupt
// if(ulStatus & (I2S_INT_XDATA|I2S_INT_XSTAFRM|I2S_INT_XLAST))
if(ulStatus & (I2S_INT_XDATA))
{
iRetVal = MAP_I2SDataPutNonBlocking(I2S_BASE,I2S_DATA_LINE_0,++I2S_Xdata);
MAP_I2SIntClear(I2S_BASE,(I2S_INT_XDATA));
if ( iRetVal == 0 )
UART_PRINT("INT_I2S_XDATA = 0x%08x \n\r",I2S_Xdata);
else
UART_PRINT("INT_I2S_XDATA FAILED! \n\r");
}
// Check if there was a receive interrupt; if so read the data from the rx buffer and acknowledge
// the interrupt
// if(ulStatus & (I2S_INT_RDATA|I2S_INT_RSTAFRM|I2S_INT_RLAST))
if(ulStatus & (I2S_INT_RDATA))
{
iRetVal = MAP_I2SDataGetNonBlocking( I2S_BASE, I2S_DATA_LINE_1,&ulDummy);
MAP_I2SIntClear(I2S_BASE,(I2S_INT_RDATA));
if ( iRetVal == 0 )
UART_PRINT("INT_I2S_RDATA = 0x%08x \n\r",ulDummy);
else
UART_PRINT("INT_I2S_RDATA FAILED! \n\r");
}
// UART_PRINT("I2SIntStatus = 0x%08x <====\n\r",ulStatus);
}
void I2S_Init(void)
{
//512000 = 16*2*16000Khz(Num of bytes * STEREO * 16000 sampling)
MAP_PRCMPeripheralClkEnable(PRCM_I2S,PRCM_RUN_MODE_CLK);
MAP_PRCMPeripheralReset(PRCM_I2S);
#if 1
MAP_PRCMI2SClockFreqSet(512000);
MAP_I2SConfigSetExpClk(I2S_BASE, 512000, 512000, I2S_SLOT_SIZE_16|I2S_PORT_CPU);
#else
MAP_PRCMI2SClockFreqSet(1411200);
MAP_I2SConfigSetExpClk(I2S_BASE, 14112000, 14112000, I2S_SLOT_SIZE_16|I2S_PORT_CPU);
#endif
MAP_I2SIntRegister(I2S_BASE, I2SIntHandler);
// MAP_I2SIntEnable(I2S_BASE,(I2S_INT_XDATA|I2S_INT_XSTAFRM|I2S_INT_XLAST) );
MAP_I2SIntEnable(I2S_BASE,(I2S_INT_XDATA) );
MAP_I2SSerializerConfig(I2S_BASE, I2S_DATA_LINE_0,I2S_SER_MODE_TX, I2S_INACT_LOW_LEVEL);
// MAP_I2SIntEnable(I2S_BASE,(I2S_INT_RDATA|I2S_INT_RSTAFRM|I2S_INT_RLAST) );
MAP_I2SIntEnable(I2S_BASE,(I2S_INT_RDATA) );
MAP_I2SSerializerConfig(I2S_BASE, I2S_DATA_LINE_1, I2S_SER_MODE_RX, I2S_INACT_LOW_LEVEL);
#if 0
MAP_I2SEnable(I2S_BASE, I2S_MODE_TX_RX_SYNC);
#endif
}
bool I2S_test_flag = 0;
void I2S_start(void)
{
MAP_I2SEnable(I2S_BASE, I2S_MODE_TX_RX_SYNC);
I2S_test_flag = 1;
}
void I2S_stop(void)
{
MAP_I2SDisable(I2S_BASE);
I2S_test_flag = 0;
}
