Does Zephyr I2C APIs support 16bit register address on ncs v2.4.2?

Question

From https://docs.zephyrproject.org/latest/hardware/peripherals/i2c.html link, I didn't find any APIs for 16bit register address. Does Zephyr I2C APIs support 16bit register address on ncs v2.4.2?

snowuyl · Accepted Answer

Thanks for your reply! I can read/write registers now. 
 static int _lp5861ReadReg(uint16_t regAddr, uint8_t *regVal) {
 printk("tca6424aReadReg(regAddr=0x%x)
", regAddr);
 const uint16_t devAddr = LP5861_CHIP_ADDRESS | _lp5861GetRegAddrHigh(regAddr);
 const uint8_t startAddr = _lp5861GetRegAddrLow(regAddr);
 printk("devAddr=0x%x, startAddr=0x%x
", 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
", regAddr, ret);
 return ERROR_I2C_READ_FAIL;
 }

printk("rbuf[0]=0x%x, rbuf[1]=0x%x
", 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)
", regAddr, regVal);
 const uint16_t devAddr = LP5861_CHIP_ADDRESS | _lp5861GetRegAddrHigh(regAddr);
 const uint8_t startAddr = _lp5861GetRegAddrLow(regAddr);
 printk("_lp5861GetRegAddrHigh(regAddr)=0x%x
", _lp5861GetRegAddrHigh(regAddr));
 printk("devAddr=0x%x, startAddr=0x%x
", 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
", regAddr, ret);
 return ERROR_I2C_WRITE_FAIL;
 }

return 0;
}

Does Zephyr I2C APIs support 16bit register address on ncs v2.4.2?

Top Replies