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部件号：TMS320F280049C “线程：sysconfig， C2000WARE”中讨论的其它部件
尊敬的团队：
我的客户想要修改两个 F280049C 芯片之间的通信例程(SPI_ex1_loopback.c)。 (例程能够正常通信)
客户已将内部回送模式下的程序分为主程序和从程序，分别启用 FIFO 及其中断，但在连接相应的引脚后未观察到正确的传输波形。
他主要修改了以下两个代码：
SpiaRegs.SPICCR.bit.SPILBK = 0；
(笑声)
SpiaRegs.SPICTL.bit.master_slave = 1；
需要进行哪些更改？
#include "F28x_Project.h"
interrupt void spiTxFifoIsr(void);
interrupt void spiRxFifoIsr(void);
void delay_loop(void);
void initSPIFIFO(void);
void InitSpi(void);
void error(void);
Uint16 sdata[8]; // Send data buffer
Uint16 rdata[8]; // Receive data buffer
Uint16 errcounter;
Uint16 rdata_point; // Keep track of where we are
// in the data stream to check received data
int m=0,n=0;
void main(void)
{
Uint16 i;
InitSysCtrl();
DINT;
InitPieCtrl();
IER = 0x0000;
IFR = 0x0000;
InitPieVectTable();
InitSpiaGpio();
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SPIA_RX_INT = &spiRxFifoIsr;
PieVectTable.SPIA_TX_INT = &spiTxFifoIsr;
EDIS; // This is needed to disable write to EALLOW protected registers
initSPIFIFO();
for(i=0;i<8;i++)
{
sdata[i]=i;
}
rdata_point = 0;
errcounter=0;
PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIE block
PieCtrlRegs.PIEIER6.bit.INTx1=1; // Enable PIE Group 6, INT 1
PieCtrlRegs.PIEIER6.bit.INTx2=1; // Enable PIE Group 6, INT 2
IER=0x20;
// IER = M_INT6// Enable CPU INT6
EINT;
// sdata = 0;
for(;;);
}
void error(void)
{
errcounter++;
asm(" ESTOP0"); // Test failed!! Stop!
for(;;);
}
void delay_loop()
{
long i;
for (i = 0; i < 10; i++) {}
}
void initSPIFIFO(void)
{
SpiaRegs.SPIFFTX.all =0xC028;
SpiaRegs.SPIFFRX.all = 0x0028;
SpiaRegs.SPIFFCT.all =0x00;
SpiaRegs.SPIFFTX.bit.TXFIFO=1;
SpiaRegs.SPIFFRX.bit.RXFIFORESET=1;
// SpiaRegs.SPICCR.bit.SPISWRESET =0;
// SpiaRegs.SPICCR.all =0x001F;
// SpiaRegs.SPICTL.all =0x0017;
// SpiaRegs.SPISTS.all =0x0000;
// SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = SPI_BRR;
// SpiaRegs.SPIFFTX.all =0xC028;
// SpiaRegs.SPIFFRX.all =0x0028;
// SpiaRegs.SPIFFCT.all =0x00;
// SpiaRegs.SPIPRI.all =0x0010;
// SpiaRegs.SPICCR.bit.SPISWRESET =1;
// SpiaRegs.SPIFFTX.bit.TXFIFO =1;
// SpiaRegs.SPIFFRX.bit.RXFIFORESET =1;
InitSpi();
}
void InitSpi(void)
{
// Set reset low before configuration changes
// Clock polarity (0 == rising, 1 == falling)
// 16-bit character
// Enable loop-back(1:使能回环 0:禁用回环)
//
SpiaRegs.SPICCR.bit.SPISWRESET = 0;
SpiaRegs.SPICCR.bit.CLKPOLARITY = 0;
SpiaRegs.SPICCR.bit.SPICHAR = (16-1);
SpiaRegs.SPICCR.bit.SPILBK = 1;
//
// Enable master (0 == slave, 1 == master)
// Enable transmission (Talk)
// Clock phase (0 == normal, 1 == delayed)
// SPI interrupts are disabled
//
SpiaRegs.SPICTL.bit.MASTER_SLAVE = 1;
SpiaRegs.SPICTL.bit.TALK = 1;
SpiaRegs.SPICTL.bit.CLK_PHASE = 0;
SpiaRegs.SPICTL.bit.SPIINTENA = 0;
// Set the baud rate
//
// SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = SPI_BRR;
SpiaRegs.SPIBRR.bit.SPI_BIT_RATE = 0x007F;
// Set FREE bit
// Halting on a breakpoint will not halt the SPI
SpiaRegs.SPIPRI.bit.FREE = 1;
//
// Release the SPI from reset
SpiaRegs.SPICCR.bit.SPISWRESET = 1;
}
/******发送中断配置*******/
interrupt void spiTxFifoIsr(void)
{
m++;
Uint16 i;
for(i=0;i<8;i++)
{
SpiaRegs.SPITXBUF =sdata[i];
}
for(i=0;i<8;i++) // Increment data for next cycle
{
sdata[i]++;
}
SpiaRegs.SPIFFTX.bit.TXFFINTCLR =1;
PieCtrlRegs.PIEACK.all|=0x20; // Issue PIE ACK
}
/*****接收中断配置********/
interrupt void spiRxFifoIsr(void)
{
n++;
Uint16 i;
for(i=0;i<8;i++)
{
rdata[i]=SpiaRegs.SPIRXBUF;
}
for(i=0;i<8;i++)
{
if(rdata[i]!=rdata_point+i)
{ error();}
}
rdata_point++;
SpiaRegs.SPIFFRX.bit.RXFFOVFCLR =1;
SpiaRegs.SPIFFRX.bit.RXFFINTCLR =1;
PieCtrlRegs.PIEACK.all|=0x20; // Issue PIE ACK
}
