i2c slave not printing the received data

[Rohit007]

hii, 

i am using stm32 nucleo g0-b1re i am trying to receive data in interrupt mode, but cant figure out what is wrong, i am new to stm32 i2c protocol.

i have used master as nucleo-h743zi2 and transmitting data, but it is not showing anything on minicom.

[Pierre_Paris]

Hello @Rohit007,

Try this code :

   /* USER CODE BEGIN 2 */
  /*##- Put I2C peripheral in reception process ###########################*/
  if (HAL_I2C_Slave_Receive_IT(&hi2c1, (uint8_t *)aRxBuffer, RXBUFFERSIZE) != HAL_OK)
  {
    /* Transfer error in reception process */
    Error_Handler();
  }

  /*##- Wait for the end of the transfer ###################################*/
  /*  Before starting a new communication transfer, you need to check the current
      state of the peripheral; if it�s busy you need to wait for the end of current
      transfer before starting a new one.
      For simplicity reasons, this example is just waiting till the end of the
      transfer, but application may perform other tasks while transfer operation
      is ongoing. */
  while (HAL_I2C_GetState(&hi2c1) != HAL_I2C_STATE_READY)
  {
  }
   /* USER CODE END 2 */

 Best Regards,

Pierre

[Rohit007]

actually it is not receiving a single bit of data, it is not entering into address callback function.

[Pierre_Paris]

Are you aware of this article? It explains what is I2C is and how to use it through examples.

I advise you to read it if you are new to stm32 I2C protocol. :)

What is your application ? Who is the master ?

[Rohit007]

my application is to read variable amount of data sent by the master. my master is nucleo- h743zi2 it is sending data of variable amount, i.e. if i send 5 byte my slave should read only that much data or if 10 bytes, slave should be ready to read that too.

[TDK]

Use a logic analyzer to understand what is happening on the line.

[Pierre_Paris]

Hello @Rohit007,

Here are some remark about what may happen :

• Are you sure you are sending the data ? to the right address ? 
• Have you scoped SDA and SCL ? I advise you to do it
• Are the HAL functions (Transmit or Receive) return an error or success code ?
• Can you share more information about your code (config h743zi2  also) and the hardware settings maybe ?

Best Regards,

Pierre

[Nish13]

Hi Rohit,

Can you please tell me how you implemented this? I've been trying to receive variable data automatically, without defining the number of bytes to receive each time.