I2C WakeUp from stop mode

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    I2C/I2C_WakeUpFromStop/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the Wake Up from Stop mode example.
  ******************************************************************************
  *
  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
  * You may not use this file except in compliance with the License.
  * You may obtain a copy of the License at:
  *
  *        http://www.st.com/software_license_agreement_liberty_v2
  *
  * Unless required by applicable law or agreed to in writing, software 
  * distributed under the License is distributed on an "AS IS" BASIS, 
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
  ******************************************************************************
   

Example Description

This example shows how to use the WakeUp from STOP feature of I2C device using the CPAL library. This example requires two boards, one configured in master mode and another one configured in slave mode.

The I2C of the slave board is configured as slave device which enters in STOP mode after activating the WakeUp from stop ability.

The master board is used to WakeUp the slave board from STOP. By pushing the Joystick SEL Button of the master board, the I2C device initialize a communication by sending a Start condition followed by the address of slave device.

The slave device is woken Up from STOP if it recognizes its own address. The received data is checked and the result is displayed on LCD.

This procedure is repeated infinitely.

The main.h file contains defines(I2C_MASTER, I2C_SLAVE) that select the type of the board(master or slave).

Note: Before entering STOP The I2C clock source must be set to HSI.

Directory contents

• I2C/I2C_WakeUpFromStop/stm32f0xx_conf.h Library Configuration file
• I2C/I2C_WakeUpFromStop/stm32f0xx_it.c Interrupt handlers
• I2C/I2C_WakeUpFromStop/stm32f0xx_it.h Interrupt handlers header file
• I2C/I2C_WakeUpFromStop/main.c Main program
• I2C/I2C_WakeUpFromStop/main.h Main program header file
• I2C/I2C_WakeUpFromStop/system_stm32f0xx.c STM32F0xx system source file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration tool and can be easily customized to meet user application requirements. To select different clock setup, use the "STM32F0xx_Clock_Configuration_VX.Y.Z.xls" provided with the AN4055 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F0xx devices.

• This example has been tested with STMicroelectronics STM320518-EVAL and STM32072B-EVAL including respectively STM32F051R8T6 and STM32F072VBT6 devices and can be easily tailored to any other supported device and development board

• STM320518-EVAL Set-up
  • Use two boards should be connected as follow after loading the example:
    • Connect I2C1 SCL pin (PB6) to I2C1 SCL pin (PB6)
    • Connect I2C1 SDA pin (PB7) to I2C1 SDA pin (PB7)
    • Connect Gnd pins of two boards.

• STM32072B-EVAL Set-up
  • Use two boards should be connected as follow after loading the example:
    • Connect I2C1 SCL pin (PB6) to I2C1 SCL pin (PB6)
    • Connect I2C1 SDA pin (PB7) to I2C1 SDA pin (PB7)
    • Connect Gnd pins of two boards.

How to use it ?

In order to make the program work, you must do the following:

• Copy all source files from this example folder to the template folder under Project
• Open your preferred toolchain
• If the used device is STM32F051R8T6 choose STM32F051 project
  • Add the following files to the project source list
    • Libraries/STM32F0xx_CPAL_Driver/stm32f0xx_i2c_cpal.c
    • Libraries/STM32F0xx_CPAL_Driver/stm32f0xx_i2c_cpal_hal.c
    • stm32f0xx_i2c_cpal_usercallback.c
    • Utilities/STM32_EVAL/STM320518_EVAL/stm320518_eval.c
    • Utilities/STM32_EVAL/STM320518_EVAL/stm320518_eval_lcd.c
• If the used device is STM32F072VBT6 choose STM32F072 project
  • Add the following files to the project source list
    • Libraries/STM32F0xx_CPAL_Driver/stm32f0xx_i2c_cpal.c
    • Libraries/STM32F0xx_CPAL_Driver/stm32f0xx_i2c_cpal_hal.c
    • stm32f0xx_i2c_cpal_usercallback.c
    • Utilities/STM32_EVAL/STM32072B_EVAL/stm32072b_eval.c
    • Utilities/STM32_EVAL/STM32072B_EVAL/stm32072b_eval_lcd.c
• Rebuild all files and load your image into target memory
• Run the example

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