[讨论]飞思卡尔MC9S08DZ16 卡尔, 讨论

jasonlyj

大家好！

我在用飞思卡尔单片机（MC9S08DZ16）和温度传感器（DS1624）使用IIC通讯时，总是不能设单片机为主机模式，报仲裁丢失位置1.我的具体程序如下:

//用DZ16自带的SDA SCL完成温度采集

#include<hidef.h>
#include"derivative.h"
#define uchar unsigned char
#define uint unsigned int

//定义函数
void MCU_Init(void);
void Time2_Init(void);
void I2C_Init(void);
void delay(void);
void delay10ms(void);
void I2C_Start(void);
void wait_ack(void);
void I2C_WriteByte(uchar data);
uchar I2C_ReadByte(void);
void I2C_Stop(void);
void DS1624_Init(void);
void Start_temperature_T(void);
void Read_temperature_T(uchar*p);
void Stop_temperature_T(void);
void Time2_Overflow(void);
double HexToDec(uchar H,uchar L);

//定义变量
uint flag;
uint k;
uint Acount;
uchar temperature[2];
double result_T;
uchar temp;

//定义时钟，总线频率为4M
void MCU_Init(void){
SOPT1=0x00;
MCGC1=0xB8;
MCGC2=Ox36;
MCGC3=0x00;
PTEDS_PTEDS5=0;
PTEDS_PTEDS4=0;
}

//定时器TPM2初始化，定义溢出中断时间为10ms
void Time2_Init(void){
TPM2SC=Ox49;
TPM2MODH=0x4E;
TPM2MODL=0x20;
}

//1us的延时
void delay(void){
_asm("nop");
_asm("nop");
_asm("nop");
_asm("nop");
}

//10ms的延时
void delay10ms(void){
uint n;
for(n=0;n<10000;n++)
delay(void);
}

void I2C_Init(void){
IICC1=0x80;
IICC2=0x00;
IICF=0x07;
}

void I2C_Start(void){
IICC1|=Ox30;
}

void wait_ack(void){
while (IICS_RXAK);
}

void I2C_WriteByte(uchar data){
IICS_IICIF=1;
IICD=data;
while (!IICS_IICIF);
}

uchar I2C_ReadByte(void){
while(!IICS_IICIF);
IICS_IICIF=1;
return IICD;
}

void I2C_Stop(void){
IICC1&=0xDF;
}

void DS1624_Init(void){
I2C_WriteByte(0x90);
wait_ack();
I2C_WriteByte(0xAC);
wait_ack();
I2C_WriteByte(0x4A);
wait_ack();
I2C_Stop();
delay10ms();
}

void Start_temperature_T(void){
I2C_WriteByte(0x90);
wait_ack();
I2C_WriteByte(0xEE);
wait_ack();
I2C_Stop();
}

void Read_temperature_T(uchar*p){
I2C_WriteByte(0x90);
wait_ack();
I2C_WriteByte(0xAA);
wait_ack();
IICC1_RSTA=1;
I2C_WriteByte(0x91);
wait_ack();
IICS_IICIF=1;
IICC1_TX=O;
*(p+1)=I2C_ReadByte();
*p=I2C_ReadByte();
IICC1_TXAK=1;
I2C_Stop();
}

void Stop_temperature_T(void){
I2C_WriteByte(0x90);
wait_ack();
I2C_WriteByte(0x22);
wait_ack();
I2C_Stop();
}

void Time2_Overflow(void){
TPM2SC_TOIE=0;
TPM2SC_TOF=0;
k++;
if(k==100){
flag=1;
k=0;
Acount++;
}
TPM2SC_TOIE=1;
}

double HexToDec(uchar H,uchar L){

//省略
}

void main (void){
uint i;
k=0;
Acount=0;
flag=0;
result_T=0;
temp=0x00;
for (i=0;i<2;i++) temperature=0;
MCU_Init();
I2C_Init();
while(IICS_BUSY);
I2C_Start();
while(!IICS_BUSY);
DS1624_Init();
Start_temperature_T();
Stop_temperature_T();
Time2_Init();
EnableInterrupts;
for(;;)
{
if(flag==1){
flag=0;
if(Acount<5)
{
I2C_Start();
Read_temperature_T(temperature);
}
else{
TPM2SC_TOIE=0;
break;
}
}
else{}
}

result_T=HexToDec(temperature[1],temperature[0]);
}