CAN Networking example

  ******************** (C) COPYRIGHT 2014 STMicroelectronics *******************
  * @file    CAN/CAN_Networking/readme.txt 
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    24-July-2014
  * @brief   Description of the CAN Networking 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 configure the CAN peripheral to send and receive CAN frames in normal mode. The sent frames are used to control Leds by pressing TAMPER push button.

The CAN serial communication link is a bus to which a number of units may be connected. This number has no theoretical limit. Practically the total number of units will be limited by delay times and/or electrical loads on the bus line.

This program behaves as follows:

• After reset LED1 is ON
• By Pressing on TAMPER Button : LED2 turns ON and all other Leds are OFF, on the N eval boards connected to the bus.
• Press on TAMPER Button again to send CAN Frame to command LEDn+1 ON, all other Leds are OFF on the N eval boards.

Note:

This example is tested with a bus of 3 units. The same program example is loaded in all units to send and receive frames.

Any unit in the CAN bus may play the role of sender (by pressing TAMPER button) or receiver.

The CAN is configured as follow:

• Bit Rate = 1 Mbit/s
• CAN Clock = external clock (HSE)
  • ID Filter = All identifiers are allowed
  • RTR = Data
  • DLC = 1 byte
  • Data: Led number that should be turned ON

Directory contents

• CAN/CAN_Networking/system_stm32f0xx.c STM32F0xx system clock configuration file
• CAN/CAN_Networking/stm32f0xx_conf.h Library Configuration file
• CAN/CAN_Networking/stm32f0xx_it.h Interrupt handlers header file
• CAN/CAN_Networking/stm32f0xx_it.c Interrupt handlers
• CAN/CAN_Networking/main.c Main program
• CAN/CAN_Networking/main.h Main program header file

Note:

The "system_stm32f0xx.c" is generated by an automatic clock configuration system and can be easily customized to your own configuration. To select different clock setup, use the "STM32F0xx_Clock_Configuration_V1.0.0.xls" provided with the AN4152 package available on ST Microcontrollers

Hardware and Software environment

• This example runs on STM32F072 Devices.

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

• STM32072B-EVAL Set-up
  • Use LED1, LED2, LED3 and LED4 connected respectively to PD.08, PD.09, PD.10 and PD.11 pins
  • Use TAMPER Push Button connected to PC.13
  • Connect a female/female CAN cable between at least 2 EVAL CAN connectors (CN6)
  • JP 4 is fitted in 1-2 position.
  • Check JP 3 is fitted.

    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
• Add the following files to the project source list
  • Utilities\STM32_EVAL\STM32072B_EVAL\stm32072b_eval.c
• Rebuild all files and load your image into target memory
• Run the example

© COPYRIGHT STMicroelectronics