write data to a register using wire library

You are attempting to write to an internal register with two consecutive calls to FT4222_I2CMaster_Write(). Issuing an Sr leaves the bus input filters in Issuing a P ensures that the bus input filters are set for 1MHz

The master sends a stop condition (P) or a repeated start condition (Sr).

The next rising edge on SDA loads the data byte into its target register and

The slave acknowledges or not acknowledges the data byte.

The slave acknowledges the register pointer.

The master sends an 8-bit register pointer.

The addressed slave asserts an acknowledge (A) by pulling SDA low.

The master sends the 7-bit slave address followed by a write bit (R/W = 0).

See the 'Writing to a Single Register' section on page 76 of the MAX77651 datasheet. Ps: I did'nt put my whole code because it is mainly configuration about FT4222 and includes, nothing relevant to solve my problem. My Question is simple, what should i do and in which order, to write properly in a register ? That code should show me 1F in the register 0x40 but it's not the case, here is what i get: The content of the register 06 is : FF ********** Writting test to the register 0x40 Printf('reading success if : %d = 0 ', chiffre) Printf('The content of the register %02X is : %02X ', valeur, resultat) ***** reading test of 0x06 : expected value : 0xFFįT4222_I2CMaster_Write(ftHandle,slaveAddr,p_valeur,Ĭhiffre = FT4222_I2CMaster_Read(ftHandle,slaveAddr,p_resultat,1, &bytesRead) Here is the part of the programm where i try to write and read: uint8 resultat=0x11 But when i check by reading after this i dont get the expected result. To write i am trying to send the register where i want to write then i send the data i want to put in the register. To read in a register i proceed like this: i first send the register i want to read then i just read what is inside. I am able to read registers so i know i dont have any hardware problems. I want to be able to write in a register.

I am programming the MAX77651 in I2c using the FT4222 device.

Write data to a register using wire library