HAL_StatusTypeDef ret_val = HAL_OK;if(HAL_I2C_GetState(&I2C_SHIELDS_Handle) == HAL_I2C_STATE_RESET) {/* I2C_SHIELDS peripheral configuration */// I2C_SHIELDS_Handle.Init.ClockSpeed = NUCLEO_I2C_SHIELDS_SPEED;// I2C_SHIELDS_Handle.Init.DutyCycle = I2C_DUTYCYCLE_2;#ifdefSTM32F401xEI2C_...