为什么SPI不能进入发送中断?-TI中文支持网

以前也做过SPI，都还可以，现在搞这个SPI怎么也进不了发送中断！

代码：

初始化

void SpiBInit(void)
{

SpibRegs.SPIFFTX.all = 0xC0C3; // Enable FIFOs, set TX FIFO level to 3
SpibRegs.SPIFFRX.all = 0x0023; // Set RX FIFO level to 3
SpibRegs.SPIFFCT.all = 0x00;

SpibRegs.SPIFFTX.bit.TXFIFO=1; // exit reset status
SpibRegs.SPIFFRX.bit.RXFIFORESET=1;

SpibRegs.***.bit.SPISWRESET = 0;
SpibRegs.***.bit.CLKPOLARITY = 0;
SpibRegs.***.bit.*** = (16-1);
SpibRegs.***.bit.SPILBK = 0;

// Enable master (0 == slave, 1 == master)
// Enable transmission (Talk)
// Clock phase (0 == normal, 1 == delayed)
// SPI interrupts are disabled
SpibRegs.***.bit.MASTER_SLAVE = 1;
SpibRegs.***.bit.TALK = 1;
SpibRegs.***.bit.CLK_PHASE = 0;
SpibRegs.***.bit.SPIINTENA = 0;

// Set the baud rate
SpibRegs.SPIBRR.bit.SPI_BIT_RATE = 499;

// Set FREE bit
// Halting on a breakpoint will not halt the SPI
SpibRegs.SPIPRI.bit.FREE = 1;

// Release the SPI from reset
SpibRegs.***.bit.SPISWRESET = 1;

SpibRegs.SPIFFTX.bit.TXFFINTCLR=1;
SpibRegs.SPIFFRX.bit.RXFFINTCLR=1;
SpibRegs.SPIFFRX.bit.RXFFOVFCLR=1;
SpibRegs.SPISTS.bit.OVERRUN_FLAG = 1;

}

开中断：

IER |= M_INT6;

PieCtrlRegs.PIEIER6.bit.INTx4 = 1; // SPI-B TX

……（略）

中断处理：

__interrupt void Spib_TxInt_isr(void)
{

SpibRegs.SPISTS.bit.OVERRUN_FLAG = 1;
//
GpioDataRegs.GPASET.bit.GPIO23 = 1;

SpibRegs.SPIFFRX.bit.RXFFINTCLR=1;
SpibRegs.SPIFFRX.bit.RXFFOVFCLR=1;
SpibRegs.SPIFFTX.bit.TXFFINTCLR=1; // Clear Interrupt flag
PieCtrlRegs.PIEACK.all = PIEACK_GROUP6;
}

发送：

void Spi_B_Send(Uint16 dat )

{

……

for ( i = 0; i < 3; i++ )
{
SpibRegs.SPITXBUF = 0x5555;
}

}

程序中，由于发现SPISTS状态显示中断发生，所以额外加入了清除状态的语句。

现在的目的，需要三个字发送完后处理某些工作，

（当打开接收中断时，倒是可以正常进入，也参考了手册中表18-3的说明）

注：CPU：TMS320f28377D

谢谢大家

Seven Han：建议对照下controlsuite中关于F28377d的spi例程。