Occasional ContributorCYCLONE V - HPS and I2C Pins on DE1-SoC Board
Hi Community
I'm trying to access an I2C Device connected to the LTC 2x7 connector available
on a DE1-SoC Board.
I would like to communicate with the device using the I2C peripheral registers
available for the HPS embedded in the Cyclone V.
Typically I2C communication requires (both in reading and writing)
- the slave address
- the register address
- the data (to write or to read)
Looking at the entire documentation I'm not able to find who to pass the REGISTER ADDRESS
or how the peripheral register must be set!
Thank you in advance for your help!
Thank you
I've made some steps toward the solution:
I write here to help some others:INITIALIZATION:
1: Disable Controller 0x6C <-- 0
2: Configure Controller to be a MASTER, set lenght to 7 bit, freq 100kH 0x00 <--63
3: Setting Target Address 0x04 <-- I2C address (for MPU6050 = 68)
4: Enable Controller 0x6C <-- 1
WRITE on register 0xXY the data 0xPQ
1: Write Slave address and Register address on I2C WITHOUT releasing bus (NO send STOP) 0x10 <-- 0xXY
2: Write Data: 0x10 <-- 0xPQ
3: you can continue writing the data for reg. (XY+1) , (XY+2) ....
4: to release the bus 0x10 <--0x2PQ (Write data and generate STOP)
READ on register 0XY
1: Write Slave address and Register address on I2C WITHOUT releasing bus (NO send STOP) 0x10 <-- 0xXY
2: Read Data and generate a STOP 0x10 <-- 3ZZ
Please note that the signals generate (on the oscilloscope) seams compatible with the protocol and the data
But data read on the Driver Registers are still instable and quasi-Random.
