还是坑爹的I2C问题

13640887584 · 发表于 2015-8-14 16:00:13

STM8S003F3P6芯片
使用了硬件I2C，程序经常死机，偶尔才正常，一直死在I2C_CheckEvent函数里面，或者在死循环
求大神解救，程序如下：
#define I2C_Speed 100000
#define I2C1_SLAVE_ADDRESS7 0xA0
GPIO_Init(GPIOB, GPIO_PIN_4, GPIO_MODE_OUT_OD_HIZ_FAST);//PB4 I2C_SCL 功能引脚，总线的时钟脚，设为高速开漏高阻输出。
GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_OD_HIZ_FAST);//PB5 I2C_SDA 功能引脚，总线的数据脚，设为高速开漏高阻输出

/*********************************************
I2C总线写一个字节
**********************************************/
void I2C_Write(unsigned char ADDR,unsigned char Wdata)
{
ITStatus it_status;
FlagStatus flag_status;

I2C_GenerateSTART(ENABLE);

//I2C启动 /* Send STRAT condition */
/* Test on EV5 and clear it */
//while(!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));
while(!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT ));

I2C_Send7bitAddress(ADDR, I2C_DIRECTION_TX); //写I2C从器件地址和写方式
/* Test on EV6 and clear it */
//while(!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
while(!I2C_CheckEvent(I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_SendData(Wdata); //写数据到器件相应寄存器
/* Test on EV8 and clear it */
while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_TRANSMITTING));

/* Send STOP condition */
I2C_GenerateSTOP(ENABLE);
}

/*********************************************
I2C总线读一个字节
返回：16位数值
**********************************************/
unsigned int I2C_Read(unsigned char ADDR)
{
unsigned int temp;
unsigned char tmp1,tmp2;
/* While the bus is busy */
while(I2C_GetFlagStatus(I2C_FLAG_BUSBUSY));

I2C_GenerateSTART(ENABLE);

//I2C启动 /* Generate start & wait event detection */
/* Test on EV5 and clear it */
//while (!I2C_CheckEvent(I2C_EVENT_MASTER_START_SENT));
while (!I2C_CheckEvent(I2C_EVENT_MASTER_MODE_SELECT));

I2C_Send7bitAddress(ADDR, I2C_DIRECTION_RX); //写I2C从器件地址和写方式
/* Test on EV6 and clear it */
//while (!I2C_CheckEvent(I2C_EVENT_MASTER_ADDRESS_ACKED));
while (!I2C_CheckEvent(I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED));
//I2C_ClearFlag(I2C_FLAG_ADDRESSSENTMATCHED);
/* 2 variables are used to avoid any compiler optimization */
/* Read the SR1 register */
tmp1 = I2C->SR1;
/* Read the SR3 register */
tmp2 = I2C->SR3;

while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED));
temp = I2C_ReceiveData();//启动主I2C读方式
//读取I2C接收数据第一字节
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C_ACK_NONE);

while (!I2C_CheckEvent(I2C_EVENT_MASTER_BYTE_RECEIVED));
temp = (temp<<8)+I2C_ReceiveData(); //读第二字节合成16位数值
I2C_GenerateSTOP(ENABLE); //I2C停止
I2C_AcknowledgeConfig(I2C_ACK_CURR); //启动主

I2C读方式,结果应答NO_ACK

return temp;
}