spi.c

来自「周立功的EASYARM2131的测试程序」· C语言 代码 · 共 22 行

#include "config.h"
uint8 s1,s2;
void SPI_INIT()
{
	PINSEL0 = (PINSEL0 & 0xFFFF00FF) | 0x00005500;
	SPCCR = 0x52 ;
	SPCR = (0<<3) | (1<<4) | (1<<5) | (0<<6) | (0<<7);
}

uint8 SPI_SendData(uint8 data)
{
	IOCLR = HC595_CS;
	SPI_SPDR = data ;
	s1 = SPI_SPDR ;
	while( (SPI_SPSR & 0x80) == 0) ;
	
	s2 = SPI_SPDR ;
	
	IOSET = HC595_CS ;
	return (SPI_SPDR);
	
}