AWR6843AOPEVM: 利用sdk里面的i2c部分的api读挂在I2C总线上的温度

Lei Gong

Part Number: AWR6843AOPEVM
Other Parts Discussed in Thread: IWR6843AOPEVM

您好，我现在手头的设备是iwr6843aopEVM安装在Boost板子上

我想做的事情是通过i2c读取这块板子上面温度传感器TMP112x的值，我在官网找到了这块板子的资料https://www.ti.com/document-viewer/lit/html/SWRU546E/GUID-00256656-BC54-48EF-B44F-3054031A4C73#TITLE-SWRU546ID-B1E452BD-DA85-44F4-AD00-B689124D4D94，这里面2.8.2节显示I2C总线上的U18、U19都是温度传感器，我想去读他们任一的值。

我按照sdk里面i2c部分的test里面的例程在在固件写了一个任务和函数去读。但是失败了，程序每次执行到I2C_transfer()这个函数的时候会传输失败，我想问问您知不知道原因或者可能的原因（比如是否有硬件相关跳线的调整或者代码的初始化不正确）。下面是我读温度的函数

Fullscreen

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
/* Read Temp function*/
float TMP_ReadTemp(I2C_Handle i2cHandle, uint8_t i2cSlaveAddress, uint8_t i2cSlaveRegAddress)
{
    uint8_t         txData[2];
    bool            retVal = true;
    uint8_t         rxData[2];
    I2C_Transaction i2cTransaction;
    int16_t         digitalTemp = 2;
    int32_t         errCode;
    /* Reset the transmit and receive buffer */
    memset(&rxData, 0, sizeof (rxData));
    /* Scan for the slave address */
    txData[0] = i2cSlaveRegAddress;
    i2cTransaction.slaveAddress = i2cSlaveAddress;
    i2cTransaction.writeBuf = txData;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf = rxData;
    i2cTransaction.readCount = 0;
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

/* Read Temp function*/
float TMP_ReadTemp(I2C_Handle i2cHandle, uint8_t i2cSlaveAddress, uint8_t i2cSlaveRegAddress)
{
    uint8_t         txData[2];
    bool            retVal = true;
    uint8_t         rxData[2];
    I2C_Transaction i2cTransaction;
    int16_t         digitalTemp = 2;
    int32_t         errCode;

    /* Reset the transmit and receive buffer */
    memset(&rxData, 0, sizeof (rxData));

    /* Scan for the slave address */
    txData[0] = i2cSlaveRegAddress;
    i2cTransaction.slaveAddress = i2cSlaveAddress;
    i2cTransaction.writeBuf = txData;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf = rxData;
    i2cTransaction.readCount = 0;

    System_printf ("2222222222 \n");
    /* Writing to slave address */
    retVal = I2C_transfer(i2cHandle, &i2cTransaction);
    if (retVal == false)
    {
        System_printf ("I2C_transfer Failed \n");
    }
    else
    {
        /* Read from slave */
        System_printf ("3333333333 \n");
        i2cTransaction.slaveAddress = i2cSlaveAddress + 1;
        i2cTransaction.writeBuf = txData;
        i2cTransaction.writeCount = 0;
        i2cTransaction.readBuf = rxData;
        i2cTransaction.readCount = 2;

        retVal = I2C_transfer(i2cHandle, &i2cTransaction);

        System_printf ("44444444444444 \n");
        if (retVal == false)
        {
            errCode = -1;
        }
        else
        {
            digitalTemp = (rxData[0]<<4) | (rxData[1]>>4);
            if(digitalTemp > 0x7FF)
            {
                digitalTemp |= 0xF000;
            }
        }
    }
    return digitalTemp * 0.0625;
}

下面是我调用这个函数的任务