28335的SCI通信双口接收怎么使数据同步

您好，感谢回答！在不要求同步的情况下A与B先后接收数据，都使用的是中断的方式，结果只有A接收正常，B接收到乱码，我把SCI模块的配置代码贴出来，麻烦您看看，是哪里的问题，感谢！
#include "DSP28x_Project.h" // Device Headerfile and Examples Include File
#include "SCI.h"

char SCIA_RX_BUF[SCIA_MAX_RECV_LEN];
char SCIB_RX_BUF[SCIB_MAX_RECV_LEN];
char SCIC_RX_BUF[SCIC_MAX_RECV_LEN];

char SCIA_Rx_STA = 0,SCIB_Rx_STA = 0,SCIC_Rx_STA = 0;
int Rx_flag_A;
int Rx_flag_B;

void SCIAInit(void)
{
EALLOW;
Rx_flag_A=0;

GpioCtrlRegs.GPBPUD.bit.GPIO36 = 0; // Enable pull-up for GPIO36 (SCIRXDA)
GpioCtrlRegs.GPBPUD.bit.GPIO35 = 0; // Enable pull-up for GPIO35 (SCITXDA)

GpioCtrlRegs.GPBQSEL1.bit.GPIO36 = 3; // Asynch input GPIO28 (SCIRXDA)

GpioCtrlRegs.GPBMUX1.bit.GPIO36 = 1; // Configure GPIO36 for SCIRXDA operation
GpioCtrlRegs.GPBMUX1.bit.GPIO35 = 1; // Configure GPIO35 for SCITXDA operation
EDIS;
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
#if (CPU_FRQ_150MHZ)
SciaRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 37.5MHz.
SciaRegs.SCILBAUD =0x0079;
#endif
#if (CPU_FRQ_100MHZ)
SciaRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 20MHz.
SciaRegs.SCILBAUD =0x0000;
#endif

SciaRegs.SCICTL2.bit.TXINTENA =1;
SciaRegs.SCICTL2.bit.RXBKINTENA =1;
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset

EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SCIRXINTA = &sciaRxIsr;//&sciaRxFifoIsr
PieVectTable.SCITXINTA = &sciaTxIsr;
EDIS;
//开中断
DINT;
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER9.bit.INTx1=1; // PIE Group 9, int1
PieCtrlRegs.PIEIER9.bit.INTx2=1; // PIE Group 9, INT2
IER = 0x100; // Enable CPU INT
EINT;
}
void SCIASendData(int a)
{
while (SciaRegs.SCICTL2.bit.TXRDY == 0) {}
SciaRegs.SCITXBUF=a;
}
void SCIASendStr(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
{
SCIASendData(msg[i]);
i++;
}
}

//Init SCIB
void SCIBInit(void)
{
EALLOW;
Rx_flag_B=0;

GpioCtrlRegs.GPAPUD.bit.GPIO18 = 0; // Enable pull-up for GPIO18 (SCITXDB)
GpioCtrlRegs.GPAPUD.bit.GPIO19 = 0; // Enable pull-up for GPIO19 (SCIRXDB)

GpioCtrlRegs.GPAQSEL2.bit.GPIO19 = 3; // Asynch input GPIO19 (SCIRXDB)
GpioCtrlRegs.GPAQSEL2.bit.GPIO18 = 3; // Asynch input GPIO18 (SCIRXDB)

GpioCtrlRegs.GPAMUX2.bit.GPIO18 = 2; // Configure GPIO18 for SCITXDB operation

GpioCtrlRegs.GPAMUX2.bit.GPIO19 = 2; // Configure GPIO19 for SCIRXDB operation

EDIS;

ScibRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
ScibRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
#if (CPU_FRQ_150MHZ)
ScibRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 37.5MHz.
ScibRegs.SCILBAUD =0x0079;
#endif
#if (CPU_FRQ_100MHZ)
ScibRegs.SCIHBAUD =0x0000; // 9600 baud @LSPCLK = 20MHz.
ScibRegs.SCILBAUD =0x001A;
#endif

ScibRegs.SCICTL2.bit.TXINTENA =1;
ScibRegs.SCICTL2.bit.RXBKINTENA =1;

ScibRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset

EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SCIRXINTC = &scibRxIsr;
PieVectTable.SCITXINTC = &scibTxIsr;
EDIS;
//
DINT;
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER9.bit.INTx3=1; // PIE Group 9, int3
PieCtrlRegs.PIEIER9.bit.INTx4=1; // PIE Group 9, INT4
IER = 0x100; // Enable CPU INT
EINT;
// ScibRegs.SCIFFTX.all=0xE040;
// ScibRegs.SCIFFRX.all=0x204f;
// ScibRegs.SCIFFCT.all=0x0;
}
void SCIBSendData(int a)
{
while (ScibRegs.SCICTL2.bit.TXRDY == 0) {}
ScibRegs.SCITXBUF=a;
}
void SCIBSendStr(char * msg)
{
int i;
i = 0;
while(msg[i] != '\0')
// while(msg[i] = '\0')
{
SCIBSendData(msg[i]);
i++;
}
}

__interrupt void sciaTxIsr(void)//
{
PieCtrlRegs.PIEACK.bit.ACK9 = 1;// Issue PIE ACK
}

__interrupt void sciaRxIsr(void)
{
Uint16 res;
if(SciaRegs.SCICTL2.bit.TXRDY == 1)
{
res = SciaRegs.SCIRXBUF.all;
SCIA_RX_BUF[SCIA_Rx_STA] = res;
SCIA_Rx_STA++;
if(SCIA_RX_BUF[0] != '#')
{
SCIA_Rx_STA=0;//接收错误从新开始。
Rx_flag_A=0;
}
if(res=='*')
{
SCIA_RX_BUF[SCIA_Rx_STA] = '\0';
Rx_flag_A=1;//接收完成
SCIA_Rx_STA=0;//0404
}
}
PieCtrlRegs.PIEACK.bit.ACK9 = 1;// Issue PIE ACK
}
///////////////
__interrupt void scibTxIsr(void)
{
PieCtrlRegs.PIEACK.bit.ACK9 = 1;// Issue PIE ACK
}
__interrupt void scibRxIsr(void)
{
Uint16 res;
if(ScibRegs.SCICTL2.bit.TXRDY == 1)
{
res = ScibRegs.SCIRXBUF.all;
SCIB_RX_BUF[SCIB_Rx_STA] = res;
SCIB_Rx_STA++;
if(SCIB_RX_BUF[0] != '#')
{
SCIB_Rx_STA=0;//接收错误从新开始。
Rx_flag_B=0;
}
if(res=='*')
{
SCIB_RX_BUF[SCIB_Rx_STA] = '\0';
Rx_flag_B=1;//接收完成
SCIB_Rx_STA=0;//
}
}
PieCtrlRegs.PIEACK.bit.ACK9 = 1;// Issue PIE ACK

}