[参考译文] TMS320F280025C：DS3231 RTC

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https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1299433/tms320f280025c-ds3231-rtc

器件型号：TMS320F280025C

在 TMS320F280025c 开发板的 i2c 协议中"i2cbus_scan function"的用途是什么。当我尝试连接 DS3231 RTC im 时,它卡在 i2c 总线扫描功能中...

uint16_t I2CBusScan(uint32_t base, uint16_t *pAvailableI2C_targets)
{
    uint16_t probeTargetAddress, i;

    //Disable interrupts on Stop condition, NACK and arbitration lost condition
    I2C_disableInterrupt(base, (I2C_INT_ADDR_TARGET|I2C_INT_STOP_CONDITION | I2C_INT_ARB_LOST | I2C_INT_NO_ACK));

    i = 0;
    for(probeTargetAddress=1;probeTargetAddress<=MAX_10_BIT_ADDRESS;probeTargetAddress++)
    {
        //Check I2C bus status
        status = checkBusStatus(base);
        if(status)
        {
           ESTOP0;
           return status;
        }

        I2C_setConfig(base, (I2C_CONTROLLER_SEND_MODE | I2C_REPEAT_MODE));

        //Enable 10-bit addressing if probeTargetAddress is greater than 127U
        if(probeTargetAddress > MAX_7_BIT_ADDRESS)
        {
            //10-bit addressing
            I2C_setAddressMode(base, I2C_ADDR_MODE_10BITS);
        }

        // Setup target address
        I2C_setTargetAddress(base, probeTargetAddress);


        I2C_sendStartCondition(base);

        //Wait for the target address to be transmitted
        while(!(I2C_getStatus(base) & I2C_STS_REG_ACCESS_RDY));

        //Generate STOP condition
        I2C_sendStopCondition(base);

        //Wait for the I2CMDR.STP to be cleared
        while(I2C_getStopConditionStatus(base));

        //Wait for the Bus busy bit to be cleared
        while(I2C_isBusBusy(base));

        uint16_t I2CStatus = I2C_getStatus(base);

        //If target address is acknowledged, store target address
        //in pAvailableI2C_targets
        if(!(I2CStatus & I2C_STS_NO_ACK))
        {
            pAvailableI2C_targets[i++] = probeTargetAddress;
        }
        //Clear NACK bit in I2CSTR
        I2C_clearStatus(base,I2C_STS_NO_ACK|I2C_STS_ARB_LOST|I2C_STS_REG_ACCESS_RDY|I2C_STS_STOP_CONDITION);
    }

    I2C_setConfig(base, (I2C_CONTROLLER_SEND_MODE));
    I2C_setAddressMode(base, I2C_ADDR_MODE_7BITS); //7-bit addressing
    I2C_enableInterrupt(base, (I2C_INT_ADDR_TARGET|I2C_INT_STOP_CONDITION | I2C_INT_ARB_LOST | I2C_INT_NO_ACK));
    return SUCCESS;
}

我震惊于

while (！(I2C_getStatus (base)和 I2C_STS_REG_ACCESS_RDY))；这不起作用。

这个问题的解决方案是什么... 这背后的原因是什么

4 个月前