Posted by nichtgedacht on 2016-04-26 13:07

Hi

read HAL documentation UM1850

You have to define pins and implement a low level function by yourself like in this example:

void HAL_I2C_MspInit(I2C_HandleTypeDef *hi2c)
{
  GPIO_InitTypeDef  GPIO_InitStruct;
  
  /*##-1- Enable peripherals and GPIO Clocks #################################*/
  /* Enable GPIO TX/RX clock */
  I2Cx_SCL_GPIO_CLK_ENABLE();
  I2Cx_SDA_GPIO_CLK_ENABLE();
  /* Enable I2Cx clock */
  I2Cx_CLK_ENABLE(); 

  /*##-2- Configure peripheral GPIO ##########################################*/  
  /* I2C TX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = I2Cx_SCL_PIN;
  GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
  GPIO_InitStruct.Pull      = GPIO_PULLUP;
  GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_HIGH;
  HAL_GPIO_Init(I2Cx_SCL_GPIO_PORT, &GPIO_InitStruct);
    
  /* I2C RX GPIO pin configuration  */
  GPIO_InitStruct.Pin       = I2Cx_SDA_PIN;
  HAL_GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStruct);
}

There are many examples in cube firmware archives. STM32Cube_FW_F1_V1.3.0 for example.

Dieter