TI中文支持网Part Number:TMS320F28035
28035调试SCI程序时，28035的时钟源用的时内部时钟1,同一控制板，通过串口助手发送接收数据，发送和接收数据都用中断完成，串口助手发送一帧数据，控制板收到数据后发送一帧数据给串口助手。收不到则不发送。当通过CCS仿真时，可以正常收发数据，当将程序写入FLASH后，重新上电，进不了接收中断（在中断里反转一个IO口观察）。请问时什么原因导致的。
void InitSciaGpio(void)
{
EALLOW;
SysCtrlRegs.PCLKCR0.bit.SCIAENCLK = 1; // SCI-A
/* Enable internal pull-up for the selected pins */
// Pull-ups can be enabled or disabled disabled by the user.
// This will enable the pullups for the specified pins.
GpioCtrlRegs.GPAPUD.bit.GPIO28 = 0; // Enable pull-up for GPIO28 (SCIRXDA)
// GpioCtrlRegs.GPAPUD.bit.GPIO7 = 0; // Enable pull-up for GPIO7 (SCIRXDA)
GpioCtrlRegs.GPAPUD.bit.GPIO29 = 0; // Enable pull-up for GPIO29 (SCITXDA)
// GpioCtrlRegs.GPAPUD.bit.GPIO12 = 0; // Enable pull-up for GPIO12 (SCITXDA)
/* Set qualification for selected pins to asynch only */
// Inputs are synchronized to SYSCLKOUT by default.
// This will select asynch (no qualification) for the selected pins.
GpioCtrlRegs.GPAQSEL2.bit.GPIO28 = 3; // Asynch input GPIO28 (SCIRXDA)
// GpioCtrlRegs.GPAQSEL1.bit.GPIO7 = 3; // Asynch input GPIO7 (SCIRXDA)
/* Configure SCI-A pins using GPIO regs*/
// This specifies which of the possible GPIO pins will be SCI functional pins.
GpioCtrlRegs.GPAMUX2.bit.GPIO28 = 1; // Configure GPIO28 for SCIRXDA operation
// GpioCtrlRegs.GPAMUX1.bit.GPIO7 = 2; // Configure GPIO7 for SCIRXDA operation
GpioCtrlRegs.GPAMUX2.bit.GPIO29 = 1; // Configure GPIO29 for SCITXDA operation
// GpioCtrlRegs.GPAMUX1.bit.GPIO12 = 2; // Configure GPIO12 for SCITXDA operation
EDIS;
}
void scia_fifo_init(void)
{
// Initialize SCI-A:
EALLOW;
SciaRegs.SCICTL1.bit.SWRESET = 0;
SciaRegs.SCICCR.all =0x00A7; // 2 stop bit, No loopback
// ODD,,8 char bits,
// async mode, idle-line protocol
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
SciaRegs.SCICTL2.bit.TXINTENA =1;
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
if(UartBaud==0x00)
{
SCIBAUD =(LSPCLK_FREQ/(SCI_FREQ*8))-1;
}
else
{
SCIBAUD =(LSPCLK_FREQ/UartBaud/100/8)-1;
}
SciaRegs.SCIHBAUD = (SCIBAUD>>8);
SciaRegs.SCILBAUD = (SCIBAUD&0xFF);
// SCIBAUD=SCI_PRD;
// SciaRegs.SCIHBAUD = SCIBAUD>>8;
// SciaRegs.SCILBAUD = SCI_PRD;
SciaRegs.SCICCR.bit.LOOPBKENA =0; // Enable loop back
// SciaRegs.SCIFFTX.all=0xC002; //
// SciaRegs.SCIFFRX.all=0x0002; // 0x0022
SciaRegs.SCIFFCT.all=0x00;
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset 使能SCI
SciaRegs.SCIFFTX.bit.TXFIFOXRESET=1;
SciaRegs.SCIFFRX.bit.RXFIFORESET=1;
// SciaRegs.SCIFFTX.bit.TXFFINTCLR=1; // Clear SCI Interrupt flag
// SciaRegs.SCIFFRX.bit.RXFFOVRCLR=1; // Clear Overflow flag
// SciaRegs.SCIFFRX.bit.RXFFINTCLR=1; // Clear Interrupt flag
PieCtrlRegs.PIEACK.all|=0x100;
SciaRegs.SCICTL1.bit.SWRESET = 1;
EDIS;
}
Ben Qin：
你好，你有做将关键函数搬运到ram中运行的工作吗？如果在ram中调试没问题的话，说明程序本身是良好的。
,
mytieric：
感谢您的回复，有搬运到RAM区运行的代码，在有485电路的控制器中用写入FLASH的程序也可以进入中断，但直接连接到SCI端口，则不能进入中断，现在在考虑是否硬件存在问题（比如共地）等，是否有其他的建议？
,
Ben Qin：
确实有可能是存在硬件问题，可以使用示波器观察下SCI端口的电平情况
