spi.c

AVR使用硬件SPI控制ISD1760源代码

#include <iom64.h>
#include "mydeclare.h"
#include "port_def.h"
#include "spi.h"



void spi_send_byte(UCHAR data)
{
  SpiSS = 0; 
  DELAY_US(5);
  
  SPDR = data;
  while((SPSR &0x80) == 0);
   ~SPDR; //防止优化 
  
  SpiSS = 1; 
  
}

void spi_send_command(UCHAR *cmdp, UCHAR cmdlen)
{
      SpiSS = 0;
      DELAY_US(5);
      for( ; cmdlen>0; cmdlen--)
      {
         SPDR = *cmdp;
         while((SPSR &0x80) == 0);
         ~SPDR; //防止优化 
         cmdp++;
      }
     
      SpiSS = 1; 
}