我基本上有这个问题一直困扰着我。我有一个PIC32MX128L128H处理器和一个基本I / O防护板。引脚和所有内容都正确完成,除了我使用I2C与EEPROM通信。我将在下面复制我的代码,但之前,我有控件:
I2C1CON:bit 0 SEN:启动条件使能位bit 2 PEN:停止条件使能位bit 3 RCEN:接收使能位bit 4 ACKEN:应答序列使能位bit 5 ACKDT:应答数据位
I2C1STAT:bit 15 ACKSTAT:应答状态位(1 =未接收,0 =已接收)bit 14 TRSTAT:发送状态位bit 6 I2COV:I2C接收溢出状态位
谢谢!
void EEPROM_wait(){
while(I2C1STAT & (1 << 15)){
I2C1CON |= 0x1;
while(I2C1CON & 0x1);
I2C1TRN = 0xa0;
while(I2C1STAT & (1 << 14));
}
}
void i2c_wait(){
while(I2C1CON & 0x1f || I2C1STAT & (1 << 14));
}
void writeByte(uint8_t lowByte, uint8_t highByte, uint8_t data){
//Start Procedure
do{
I2C1CON |= 0x1;
i2c_wait();
I2C1TRN = 0xa0;
i2c_wait();
} while(I2C1STAT & (1 << 15));
//Send the adress of the EEPROM and also R/W bit
//Send highByte
I2C1TRN = highByte;
i2c_wait();
//Send lowByte
I2C1TRN = lowByte;
i2c_wait();
//Send actual data
I2C1TRN = data;
i2c_wait();
//Stop the procedure
I2C1CON |= 0x4;
i2c_wait();
EEPROM_wait();
}
uint8_t readByte(uint8_t lowByte, uint8_t highByte)
{
//Initialize Procedure
do{
I2C1CON |= 0x1;
i2c_wait();
I2C1TRN = 0xa0;
i2c_wait();
}while(I2C1STAT & (1 << 15));
//Send the address of the EEPROM
//I2C1TRN = 0xa0;
//i2c_wait();
//Send highByte
I2C1TRN = highByte;
i2c_wait();
//Send lowByte
I2C1TRN = lowByte;
i2c_wait();
//Initialize Procedure Read
do{
I2C1CON |= 0x1;
i2c_wait();
I2C1TRN = 0xa1;
i2c_wait();
} while (I2C1STAT & (1 << 15));
//Send the address of the EEPROM with Read bit
//I2C1TRN = 0xa1;
//i2c_wait();
//Enable Receive Procedure
I2C1CON |= 1 << 3;
i2c_wait();
I2C1STATCLR = 1 << 6;
//Read from the EEPROM
uint8_t rtn = I2C1RCV;
//Acknowledge
I2C1CON &= ~(1 << 5);
I2C1CON |= 1 << 4;
//Stop Procedure
I2C1CON |= 1 << 2;
i2c_wait();
return rtn;
}
我意识到问题是什么。芯片组总线时钟速率与i2c总线时钟的设置不同,后者导致读写或误读。