TI中文支持网Part Number:TMS320F28377D
上电时，发送AABBA0FF，判断发送正常。
点手动发送AABBA1FF，可以接收到一次，后面再次点手动发送，无法接收到。有时还会出现第一次点手动发送AABBA1FF，显示乱码（比如收到BB 00 53这种）。
以下为代码（刚接触DSP，有挺多不太了解的地方，望大佬指正，万分感谢）
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#include "F28x_Project.h" // Device Headerfile and Examples Include File
// Prototype statements for functions found within this file.
void scic_echoback_init(void);
void scic_fifo_init(void);
void scic_xmit(int a);
void scic_msg(Uint16 *msg,Uint16 len);
// Global counts used in this example
Uint16 LoopCount;
#define RX_EN GpioDataRegs.GPCCLEAR.bit.GPIO68 = 1;
#define TX_EN GpioDataRegs.GPCSET.bit.GPIO68 = 1;
//Uint16 ReceivedChar;
Uint16 anwser[]={0x00AA,0x00BB,0x00A0,0x00FF};
int len;
Uint16 res[];
Uint16 *msg;
void main(void)
{
InitSysCtrl();
InitGpio();
EALLOW;
GpioCtrlRegs.GPBGMUX2.bit.GPIO56 = 1;
GpioCtrlRegs.GPBGMUX2.bit.GPIO57 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO56 = 2;
GpioCtrlRegs.GPBMUX2.bit.GPIO57 = 2;
EDIS;
GPIO_SetupPinMux(68, GPIO_MUX_CPU1, 0);
GPIO_SetupPinOptions(68, GPIO_OUTPUT, GPIO_PUSHPULL);
DINT;
InitPieCtrl();
// Disable CPU __interrupts and clear all CPU __interrupt flags:
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
// Step 4. User specific code:
LoopCount = 0;
scic_fifo_init(); // Initialize the SCI FIFO
scic_echoback_init(); // Initialize SCI for echoback
TX_EN
msg=anwser;
scic_msg(msg,6);
for(;;)
{
int i;
RX_EN;
// Wait for inc character
// while(ScicRegs.SCIFFRX.bit.RXFFST ==0){}// wait for XRDY =1 for empty state
while(ScicRegs.SCIRXST.bit.RXRDY == 0){}
for(i=0;i<4;i++)
// Get character
{
res[i]= ScicRegs.SCIRXBUF.all & 0x00FF;
LoopCount++;
}
scic_msg(res,6);
LoopCount = 0;
}
}
void scic_echoback_init()
{
// Note: Clocks were turned on to the SCIA peripheral
// in the InitSysCtrl() function
ScicRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
ScicRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
ScicRegs.SCICTL2.all =0x0003;
ScicRegs.SCICTL2.bit.TXINTENA =1;
ScicRegs.SCICTL2.bit.RXBKINTENA =1;
//
// SCIA at 9600 baud
// @LSPCLK = 50 MHz (200 MHz SYSCLK) HBAUD = 0x02 and LBAUD = 0x8B.
// @LSPCLK = 30 MHz (120 MHz SYSCLK) HBAUD = 0x01 and LBAUD = 0x86.
//
ScicRegs.SCIHBAUD.all =0x0002;
ScicRegs.SCILBAUD.all =0x008B;
ScicRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
void scic_msg(Uint16 *msg,Uint16 len)
{
int i;
TX_EN;
for(i=0;i<len;i++)
{
while (ScicRegs.SCICTL2.bit.TXRDY == 0) {}
ScicRegs.SCITXBUF.all =msg[i]&0x00FF;
}
RX_EN;
}
// Initialize the SCI FIFO
void scic_fifo_init()
{
ScicRegs.SCIFFTX.all=0xE040;//SCI reset,FIFO 增强功能使能，再次使能发送FIFO，清除TXFFINT标志
ScicRegs.SCIFFRX.all=0x2040;//SCI reset,清除TXFFINT标志,中断深度0
ScicRegs.SCIFFCT.all=0x0;
}
gao feng：
还有两处不解：
1.scic_msg()函数里，len写4，在上电运行的时候，串口的接收区收到的是AABB，写6才收到AABBA0FF，这是为什么？不是循环一次，发送一个字节的数据吗？
2.单步运行看了一下，在第二次第三次…按手动发送按钮，串口接收区没有数据时，代码停在 while(ScicRegs.SCIRXST.bit.RXRDY == 0) {} 这一行，代码反映的问题是没有接收到新数据，可是我明明发送了，这是什么问题呢？
