Forum Discussion
Occasional ContributorCYCLONE V - HPS and I2C Pins on DE1-SoC Board
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.
Occasional ContributorAs I've already written above:
I found the correct command sequence to read and write on the I2C bus using the embedded registers of the driver.
As a final note: The proposed sequence of commands works pretty well if provided through a suitable algorithm (for instance written in C) while it does not work if provided, writing directly on the peripheral interface address location using Altera Monitor Program, may be because this tool is unable to perform separately the read and write procedure.
