#include "compiler_defs.h"
#include "C8051F500_defs.h"
#include "Global.h"
#include "VisitEnc.h"
U8 errorflag = 0;/* 用来标识download过程中读MB86391的数据时出错 */
void send_start(void)
{
SCK = 0; NOP();
MOSI = 0; NOP();
SCK = 1; NOP();
}
void send_data(U8 databyte)
{
U8 i, j, shift;
j = 0;
for(i = 0; i < 8; i++){
SCK = 0;
shift = ((databyte&0x80)?1:0);
MOSI = shift; NOP();
SCK = 1;
databyte = (databyte<<1);
if(shift == 1) {j++;}
}
if((j%2) == 0){
shift = 0;
}
else{
shift = 1;
}
SCK = 0; NOP();
MOSI = shift; NOP();
SCK = 1;NOP();
}
void send_stop(void)
{
SCK = 0; NOP();
MOSI = 1; NOP();
SCK = 1; NOP();
}
void read_start(void)
{
while(1){
SCK = 0;
if(MISO == 0){
SCK = 1;
break;
}
SCK = 1;
NOP();
}
}
U8 read_data(void)
{
U8 i, j, shift, value;
j = 0;
shift = 0x00;
for(i = 0; i < 8; i++){
shift = (shift<<1);
SCK = 0;
if(MISO == 1){
shift = (shift|0x01);
j++;
}
SCK = 1;
}
if((j%2) == 0){ /* 偶校验，当字节中1为偶数个时，校验位为0，否则errorflag置1标识出错 */
SCK = 0;
if(MISO == 0){
SCK = 1;
}
else{
SCK = 1;
errorflag = 1;
}
}
else{ /* 偶校验，当字节中1为奇数个时，校验位为1，否则errorflag置1标识出错 */
SCK = 0;
if(MISO == 1){
SCK = 1;
}
else{
SCK =1;
errorflag = 1;
}
}
value = shift;
return value;
}
bool read_stop(void)
{
SCK = 0;
if(MISO == 1)
return true;
else
return false;
SCK = 1;
}
