sendstartbit.c

来自「AT90S8515读写AT17C010源程序」· C语言 代码 · 共 33 行

// SendStartBit.c
// generates a start bit
// start bit is a 1 to 0 transition on SDA while SCL is high
/*
         ____________
        /
SCL ___/
    
    __________
              \
SDA            \_____

*/
 
#include "at17c.h"
 
extern void WriteSCL(unsigned char state);
extern void WriteSDA(unsigned char state);
extern void BitDelay(void);
extern unsigned char SetSCLHigh(void);

void SendStartBit(void) {
    
    WriteSDA(1);
    BitDelay();
    SetSCLHigh();
    BitDelay();
    WriteSDA(0);
    BitDelay();
    WriteSCL(0);
    BitDelay();
}