However, I put in many different registers into the function into the function, but it always returns the same number. I've written a function, readRegister() (below) that's supposed to get the data from the sensor. Set_register(0X5A, ATO_CFGU, 0xC9) // USL = (Vdd-0.7)/vdd256 = 0xC9 set_register(0X5A, ATO_CFGL, 0x82) // LSL = 0.65 USL = 0x82 ATO_CFGT, 0xB5) / // Target = 0.I'm trying to write a library for an accelerometer/magnetometer sensor. Set_register(0X5A, ELE_CFG, 0x0C) // Enables all 12 Electrodes Set ELE_CFG to 0x00 to return to standby mode Section C - Sets touch and release thresholds for each electrode Section B - Controls filtering when data is < baseline. Wire.beginTransmission(0x5A) // select device with 'beginTransmission()' I have a try with your code, and i think your code seems right, but the output data still begins from the first register:0x00.ĭigitalWrite(irqpin, HIGH) //enable pullup resistor

Register5= Wire.read() // read next byte from the following register Register4= Wire.read() // read from the starting register Wire.requestFrom(DEVICE_I2C_ADDRESS, 2) // select number of bytes to get from the device (2 bytes in this case) Wire.endTransmission() // end write operation, as we just wanted to select the starting register Wire.write(0x04) // select starting register with 'write()' Wire.beginTransmission(DEVICE_I2C_ADDRESS) // select device with 'beginTransmission()'

Typical I2C read from a selected start register goes like that for reading two bytes from register 0x04 and 0x05: #define DEVICE_I2C_ADDRESS 0x5A // this must be the I2C bus address of your device You will have to select the register by using a write command.

for example, the i2c slave's address is 0x5A, the code Wire.requestFrom(0x5A,2) can read two 8-bits data from slave 0x5A, from the register address ox01 and 0x02.īut i want to read data from register address ,such as ox04, directly? how should i do? The method Wire.requestFrom(address,numberofdata), the address is the slave's address, it is not the slave's register's address.

Arduino wire library read from register