DSP2812入学习进程（7）SPI自检程序分析

只看该作者 · 2012-3-27 09:07

#include "inc/DSP28_Device.h"
#include "inc/DSP28_GlobalPrototypes.h"
#define uchar unsigned char
#define uint unsigned int
uchar ct;
unsigned  int  *Led  = (unsigned int *)0x4100; 应用的CPLd作为地址的
interrupt void spirx(void)
{
*Led = SpiaRegs.SPIRXBUF;
SpiaRegs.SPIFFRX.bit.RXFFINTCLR=1;
SpiaRegs.SPIFFRX.bit.RXFFOVFCLR=1;这两步是清楚中断和溢出标志的
PieCtrl.PIEACK.all= 0x20;这是为了能够再一次相应该中断的
}
interrupt void spitx(void)
{ uint i;
  SpiaRegs.SPITXBUF=ct;
  while(Spi_TxReady()!=1);
  for(i=0;i<50000;i++);
  ct++;
  PieCtrl.PIEACK.all= 0x20;
  SpiaRegs.SPIFFTX.bit.TXFFINTINTCLR=1;
}
void init_spi(void)
{
SpiaRegs.SPICCR.bit.RESET=0;复位spi
SpiaRegs.SPICCR.bit.SPICHAR=0x08;设置发送8个字节
SpiaRegs.SPICCR.bit.SPILBK=1;自检模式打开

SpiaRegs.SPICTL.bit.MASTER_SLAVE=1;必须设置为主模式
SpiaRegs.SPICTL.bit.SPIINTENA=1;中断使能
SpiaRegs.SPICTL.bit.OVERRUN=1;
SpiaRegs.SPICTL.bit.TALK=1;

SpiaRegs.SPIFFTX.all=0xc021;打开接收fifo，并设置接收一个字符
SpiaRegs.SPIFFRX.all=0x0021;
SpiaRegs.SPIBRR=0x1D;
SpiaRegs.SPIFFCT.all=0x00;

SpiaRegs.SPIPRI.all=0x10;

SpiaRegs.SPIFFRX.bit.RXFIFORESET=1;
SpiaRegs.SPIFFTX.bit.TXFIFORESET=1;开始fifo工作

SpiaRegs.SPICCR.bit.RESET=1;
}
void init_gpio(void)
{
EALLOW;
GpioMuxRegs.GPFMUX.bit.SPISIMOA_GPIOF0 = 1;

GpioMuxRegs.GPFMUX.bit.SPICLKA_GPIOF2  = 1;

PieVectTable.SPIRXINTA =&spirx;
PieVectTable.SPITXINTA =&spitx;

PieCtrl.PIECRTL.bit.ENPIE=1;
PieCtrl.PIEIER6.bit.INTx1=1;
PieCtrl.PIEIER6.bit.INTx2=1;

IER =0x20;

EDIS;
}
void main(void)
{

InitSysCtrl();
DINT;

InitPieCtrl();
InitPieVectTable();
init_spi();
init_gpio();
*Led = ct+5;
EINT;
while(1)
{

/* if(Spi_TxReady()==1)
  SpiaRegs.SPITXBUF=ct;
  while(Spi_TxReady()!=1);
  for(i=0;i<50000;i++);
  ct++;*/
}
}