280049 I2C控制TCA9539 丢失STOP位

Uint16 I2CwriteData(volatile struct I2CMsg *msg)
{
    Uint16 i;

    //
    // Wait until the STP bit is cleared from any previous master
    // communication. Clearing of this bit by the module is delayed until after
    // the SCD bit is set. If this bit is not checked prior to initiating a new
    // message, the I2C could get confused.
    //
    if(I2C_getStopConditionStatus(I2CA_BASE))
    {
        return(ERROR_STOP_NOT_READY);
    }

    //
    // Setup slave address
    //
    I2C_setSlaveAddress(I2CA_BASE, SLAVE_ADDRESS);

    //
    // Check if bus busy
    //
    if(I2C_isBusBusy(I2CA_BASE))
    {
        return(ERROR_BUS_BUSY);
    }

    //
    // Setup number of bytes to send msgBuffer and address
    //
    I2C_setDataCount(I2CA_BASE, (msg->numBytes + 1));

    //
    // Setup data to send
    //
    I2C_putData(I2CA_BASE, msg->RegAddr);

    for (i = 0; i < msg->numBytes; i++)
    {
        I2C_putData(I2CA_BASE, msg->msgBuffer[i]);
    }

    //
    // Send start as master transmitter
    //
    I2C_setConfig(I2CA_BASE, I2C_MASTER_SEND_MODE);
    I2C_sendStartCondition(I2CA_BASE);
    I2C_sendStopCondition(I2CA_BASE);

    return(I2C_SUCCESS);
}