adc7512._c

这是atmega128单片机的数模转换程序

#include<iom128v.h>
#define uchar unsigned char 
#define uint unsigned int 

//延时函数
void s_ms(unsigned int t)
{
    for(;t>1;t--)
    {
    }
}

void spi_init()
{
DDRB=0xf7;   //端口设置
PORTB=0xff;
SPSR=0x00;
SPCR=0x5d;   //主机模式 方式0 ocs/16
}

void spi_send(uint spi_data)
{
uchar spi_lo,spi_hi;
spi_lo=spi_data;
spi_hi=spi_data>>8;

PORTB&=~(1<<0);                //ss=0
SPDR=spi_hi;
while(!(SPSR&(1<<SPIF)));
SPDR=spi_lo;
while(!(SPSR&(1<<SPIF)));
PORTB|=(1<<0);
}

//主函数
main()
{
s_ms(50000);  //等待7512复位
spi_init();
spi_send(0x07,0xff);
while(1);
}