i2c_burst_read(0x0) failed, ret=-5 on ncs v2.4.2

[snowuyl]

I use nRF52832 device to test I2C reading/writing registers. But it failed with error code -5. What is meaning of error code -5 and how to fix this issue?

00> *** Booting Zephyr OS build v3.3.99-ncs1-1 ***
00> Starting button Test example
00> device_is_ready() ok
00> nrfx_gpiote_input_configure() okay for button
00> val=1
00> button released
00> start a timer
00> now-1-11-30 0:0:0
00> 0
00> ledDriverInit
00> tca6424aReadReg(regAddr=0x0)
00> LP5861_REG_ADDR_HIGH(regAddr)=0x0, LP5861_REG_ADDR_LOW(regAddr)=0x0
00> devAddr=0x81, startAddr=0x0
00> [00:00:00.501,129] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
00> i2c_burst_read(0x0) failed, ret=-5
00> _buttonTimerHandler: 3000
00> now-1-11-30 0:0:0
00> button released

Procedures to reproduce this issue are as follows.

1. Unzipping custom_nrf52832.zip to C:\ncs\v2.4.2\nrf\boards folder.

2. Unzipping minimal_log_led.zip to C:\ncs\v2.4.2\nrf\samples folder.

3. cd C:\ncs\v2.4.2\nrf\samples\minimal_log_led

4. west build -b custom_nrf52832

5. west flash

6. Rebooting nRF52832 device and connecting to RTT Viewer.

[snowuyl]

Thanks for your reply! I can read/write registers now.

static int _lp5861ReadReg(uint16_t regAddr, uint8_t *regVal) {
    printk("tca6424aReadReg(regAddr=0x%x)\n", regAddr);
    const uint16_t devAddr   = LP5861_CHIP_ADDRESS | _lp5861GetRegAddrHigh(regAddr);
    const uint8_t  startAddr = _lp5861GetRegAddrLow(regAddr);
    printk("devAddr=0x%x, startAddr=0x%x\n", devAddr, startAddr);
    uint8_t rbuf[2];
    const int ret = i2c_burst_read(_gI2cDev, devAddr, startAddr, rbuf, sizeof(rbuf));
    if (ret < 0) {
        printk("i2c_burst_read(0x%x) failed, ret=%d\n", regAddr, ret);
        return ERROR_I2C_READ_FAIL;
    }

    printk("rbuf[0]=0x%x, rbuf[1]=0x%x\n", rbuf[0], rbuf[1]);
    *regVal = rbuf[0];
    return 0;
}

static int _lp5861WriteReg(uint16_t regAddr, uint8_t regVal) {
    printk("tca6424aWriteReg(regAddr=0x%x, regVal0x%x)\n", regAddr, regVal);
    const uint16_t devAddr   = LP5861_CHIP_ADDRESS | _lp5861GetRegAddrHigh(regAddr);
    const uint8_t  startAddr = _lp5861GetRegAddrLow(regAddr);
    printk("_lp5861GetRegAddrHigh(regAddr)=0x%x\n", _lp5861GetRegAddrHigh(regAddr));
    printk("devAddr=0x%x, startAddr=0x%x\n", devAddr, startAddr);
    const uint8_t wbuf[2] = { regVal,  0x00};
    const int ret =  i2c_burst_write(_gI2cDev, devAddr, startAddr, wbuf, sizeof(wbuf));
    if (ret < 0) {
        printk("i2c_burst_write(0x%x) failed, ret=%d\n", regAddr, ret);
        return ERROR_I2C_WRITE_FAIL;
    }

    return 0;
}