Master board i2c don t comm with slave board, between 2 stm board

[SDall]

Hi, I'm giving the example of the two stm32 boards at this link

https://github.com/sogongbang/STM32CubeF4/tree/master/Projects/STM32F4-Discovery/Examples/I2C/I2C_TwoBoards_ComPolling

I made and copied the connection and the code then I checked several times, everything matches, the problem is that when I execute the hall master i2c trasmitt function, it gives me an error, the master does not connect with the slave:

while(HAL_I2C_Master_Transmit(&I2cHandle, (uint16_t)I2C_ADDRESS, (uint8_t*)aTxBuffer, TXBUFFERSIZE, 10000)!= HAL_OK)
{
/* Error_Handler() function is called when Timeout error occurs.
When Acknowledge failure occurs (Slave don't acknowledge it's address)
Master restarts communication */
if (HAL_I2C_GetError(&I2cHandle) != HAL_I2C_ERROR_AF)
{
Error_Handler();
}
}

The code stop in function Error_Handler()

Tanks

[Karl Yamashita]

It doesn't mean your code is equivalent. You could have missed something from that tutorial. So post your code that you are working with. Attach your IOC file too.

[SDall]

I m Sorry but i m using two f 401 re ,connection Is ok, ,firmawer Is last ,but the slave don t receive,don t aknoweledge tò master.....

[Andrew Neil]

So, again, have you used an oscilloscope to see what's actually happening on the wires?

Have you separately debugged your master code, and your slave code?

[Shirley.Ye]

please check your code for i2c initialization. what is the i2c address? and how about the IO configuration? (make sure to configure the pin as the AF open Drain mode)

[PGump.1]

Hi,

The example given on github doesn't include pullups. If it has been copied verbatim, that'll be the problem...

I hope this helps.

Kind regards
Pedro