| #include "stm32f1xx_hal.h"
I2C_HandleTypeDef hi2c1;
void SystemClock_Config(void);
int main(void) {
  HAL_Init();
  SystemClock_Config();
  MX_I2C1_Init();
  while (1) {
    // Your main code here
  }
}
void SystemClock_Config(void) {
  // Configure the system clock
  // ...
  // Configure the peripheral clocks
  // ...
}
void MX_I2C1_Init(void) {
  hi2c1.Instance = I2C1;
  hi2c1.Init.ClockSpeed = 1000000; // 1MHz
  hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
  hi2c1.Init.OwnAddress1 = 0;
  hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
  hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
  hi2c1.Init.OwnAddress2 = 0;
  hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
  hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
  if (HAL_I2C_Init(&hi2c1) != HAL_OK) {
    Error_Handler();
  }
}
 |