使用I2C_transfer无法驱动tmp103

user5857262

Prodigy 60 points

Other Parts Discussed in Thread: TMP007, CC1350, TMP103

使用CC1350launchpad和TMP103A，用的IAR下的tmp007示例nortos\CC1350_LAUNCHXL\drivers\i2ctmp007

SDK版本simplelink_cc13x0_sdk_2_20_00_38

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对比tmp007与tmp103的说明

更改了从机地址slaveAddress为103A的0b1110000(0x70)以及txBuffer[0] = 0x00;temperatrue register地址(只读

接线按照示例设置，SCL接在DIO4，SDA在DIO5

TMP103A 的 SCL与SDA分别带有10K上拉电阻，VCC是launchpad上3.3V，GND也是launchpad上的

电路连接如TMP103说明中的典型应用图相似

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void *mainThread(void *arg0)
{
    unsigned int    i;
    uint8_t         txBuffer[1];
    uint8_t         rxBuffer[2];
    I2C_Handle      i2c;
    I2C_Params      i2cParams;
    I2C_Transaction i2cTransaction;
    
    /* Call driver init functions */
    GPIO_init();
    I2C_init();
    
    /* Configure the LED pin */
    GPIO_setConfig(Board_GPIO_LED0, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);
    GPIO_setConfig(Board_GPIO_LED1, GPIO_CFG_OUT_STD | GPIO_CFG_OUT_LOW);

    /* Create I2C for usage */
    I2C_Params_init(&i2cParams);
    i2cParams.bitRate = I2C_400kHz;
    i2c = I2C_open(Board_I2C_TMP, &i2cParams);
    if (i2c == NULL) {while (1);}
    GPIO_write(Board_GPIO_LED0, Board_GPIO_LED_ON);

    txBuffer[0] = 0x00;
    i2cTransaction.slaveAddress = 0x70;
    i2cTransaction.writeBuf = txBuffer;
    i2cTransaction.writeCount = 1;
    i2cTransaction.readBuf = rxBuffer;
    i2cTransaction.readCount = 1;

    for (i = 0; i < 20; i++) {
        if (I2C_transfer(i2c, &i2cTransaction)) {
            GPIO_write(Board_GPIO_LED1, Board_GPIO_LED_ON);
        }
        sleep(1);
    }
    I2C_close(i2c);
    return (NULL);
}

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示例其他部分代码没有改动，现象是LED0(红)会亮，LED1(绿)一直不亮(I2C_transfer返回失败false

SCL波形是1秒间隔有一个“V”下降上升，其他时间保持3.3V不变

请问我的电路连接上或软件上需要如何修改？

6 年多前