isd4002.c

来自「利用freescale公司的MC9S08QE128开发的一套游戏机程序」· C语言 代码 · 共 45 行

#include "derivative.h" /* include peripheral declarations */
#include "ISD4002.h"
#define setReg8(RegName, val)                                    (RegName = (byte)(val))
#define SETPLAY  0xE0


void powerUpISD() 
{
  while(!SPI1S_SPTEF)
    SPI1D = 0x20;
}
void SPI1Init()
{
  /* SPI1C1: SPIE=0,SPE=1,SPTIE=0,MSTR=1,CPOL=0,CPHA=1,SSOE=1,LSBFE=1 */
  setReg8(SPI1C1, 0x53);               /* Disable the SPI1 module clearing the SPRF flag */ 
  /* SPI1C2: ??=0,??=0,??=0,MODFEN=1,BIDIROE=1,??=0,SPISWAI=1,SPC0=0 */
  setReg8(SPI1C2, 0x1A);                
  /* SPI1BR: ??=0,SPPR2=1,SPPR1=1,SPPR0=1,??=0,SPR2=1,SPR1=1,SPR0=1 */
  setReg8(SPI1BR, 0x77);
  powerUpISD();
  stopPlay();
}

void play(unsigned int addr)
{
  unsigned int addrP;
  addrP = addr;
  while(!SPI1S_SPTEF);
    SPI1D = (byte)(addrP%256);
  while(!SPI1S_SPTEF);
    SPI1D = ((byte)(addrP/256)&0x07)|(SETPLAY&0xF8);
    
}
void stopPlay()
{
  while(!SPI1S_SPTEF);
    SPI1D = 0x30;  
}

void playCurrentAddr()
{
  while(!SPI1S_SPTEF);
    SPI1D = 0xF0;  
}