spi.c

来自「CVAVR的函数库的源代码。开发AVR的编译器CodeVision AVR最新版」· C语言 代码 · 共 21 行

/*
  CodeVisionAVR C Compiler
  (C) 1998-2007 Pavel Haiduc, HP InfoTech S.R.L.

  SPI access function
*/

#include <io.h>

#ifndef SPIF
#define SPIF 7
#endif

unsigned char spi(unsigned char data)
{
SPDR=data;
while ((SPSR & (1<<SPIF))==0);
return SPDR;
}