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MSP430G2553 与BQ76940DEMO板IIC无法通信

xinwei zhao
Prodigy 105 points
Other Parts Discussed in Thread: BQ76940, MSP430G2553

MSP430G2553 与BQ76940  DEMO板IIC无法通信

1、硬件采用MSP430G2553 demo板和BQ76940  DEMO板

2、编译环境采用IAR5.3 FORMSP430 ，程序下载的TI官网上BQ76940目录下的例程

3、开发设计处于方案样机阶段

4、调试过程中单步运行程序停在下面函数

int I2CSendBytes(unsigned char I2CSlaveAddress, unsigned char *DataBuffer, unsigned int ByteCount, unsigned int *SentByte)

中的下面的位置

 while(DelayCounter < DELAY_LIMIT && (!(IFG2 & UCB0TXIFG) || (UCB0CTL1 & UCTXSTT))) //check if the byte has been sent   

{     DelayCounter++;    }

5、TI官网的程序可以拿来直接用吗？还是需要修改某些参数

  • 0
    TI__Mastermind 20765 points

    请先确认一下BQ76940的后缀是什么。不同的后缀代表不同的I2C地址（0x08或0x18），和I2C通讯带不带CRC校验。

  • 0 回复 Hugo Zhang
    Prodigy 105 points

    非常感谢你的提醒，demo 板上的是bq7694000是不带CRC，地址是0X08,

    但是我在官网下载的程序是带CRC的程序，你那有不带CRC的程序吗？

  • 0 回复 Hugo Zhang
    Prodigy 105 points

    还是初始化操作，我把//后的代码修改了为上面的直接调用例程里的函数，单步运行时还是一样的效果，运行到那个位置就不走了

    int GetADCGainOffset() {  int result;

     result = I2CReadRegisterByte(BQMAXIMO, ADCGAIN1, &(Registers.ADCGain1.ADCGain1Byte));  

    result = I2CReadRegisterByte(BQMAXIMO, ADCGAIN2, &(Registers.ADCGain2.ADCGain2Byte));

     result = I2CReadRegisterByte(BQMAXIMO, ADCOFFSET, &(Registers.ADCOffset));        

    //result = I2CReadRegisterByteWithCRC  (BQMAXIMO, ADCGAIN1, &(Registers.ADCGain1.ADCGain1Byte));

     //result = I2CReadRegisterByteWithCRC(BQMAXIMO, ADCGAIN2, &(Registers.ADCGain2.ADCGain2Byte));

     //result = I2CReadRegisterByteWithCRC(BQMAXIMO, ADCOFFSET, &(Registers.ADCOffset));

     return result; }