/**
  @page CAN_DualFIFO CAN Dual FIFO example
  
  @verbatim
  ******************** (C) COPYRIGHT 2015 STMicroelectronics *******************
  * @file    CAN/CAN_DualFIFO/readme.txt 
  * @author  MCD Application Team
  * @version V1.1.3
  * @date    15-December-2021
  * @brief   Description of the CAN Dual_FIFO example.
  ******************************************************************************
  *
  * Copyright (c) 2015 STMicroelectronics.
  * All rights reserved.
  *
  * This software is licensed under terms that can be found in the LICENSE file
  * in the root directory of this software component.
  * If no LICENSE file comes with this software, it is provided AS-IS.
  *
  ******************************************************************************
   @endverbatim

@par Example Description 

This example shows how to configure the CAN peripheral to send and receive 
CAN frames in normal mode and using FIFO0 and FIFO1. The sent frames are used to control Leds 
by pressing key or SEL push buttons.
For the sent frames two different.standard identifier are used "0x321" is used when 
pressing SEL and the other one (0x123) is transmitted by pressing on KEY 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:
  - By Pressing on SEL Button : LED1 turns ON and all other Leds are OFF, on the N
    eval boards connected to the bus. 
  - Press on SEL Button again to send CAN Frame to command LEDn+1 ON, all other Leds 
    are OFF on the N eval boards.

  - By Pressing on KEY Button : LED4 turns ON and all other Leds are OFF, on the N
    eval boards connected to the bus. 
  - Press on KEY Button again to send CAN Frame to command LEDn-1 ON, all other Leds 
    are OFF on the N eval boards.
    
  - The USER can use KEY and SEL in the same time to Control LEDs.

@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.
@note Any unit in the CAN bus may play the role of sender (by pressing KEY/SEL button)
      or receiver.

The CAN is configured as follow:
    - Bit Rate   = 1 Mbit/s  
    - CAN Clock  = external clock (HSE)
    - ID Filter for FIFO0: 0x123 identifiers are allowed
    - ID Filter for FIFO1: 0x321 identifiers are allowed 
    - RTR = Data
    - DLC = 1 byte
    - Data: Led number that should be turned ON


@par Directory contents 

  - CAN/CAN_DualFIFO/stm32f30x_conf.h    Library Configuration file
  - CAN/CAN_DualFIFO/stm32f30x_it.c      Interrupt handlers
  - CAN/CAN_DualFIFO/stm32f30x_it.h      Interrupt handlers header file
  - CAN/CAN_DualFIFO/main.c              Main program
  - CAN/CAN_DualFIFO/main.h              Main program header file
  - CAN/CAN_DualFIFO/system_stm32f30x.c  STM32F30x system source file
  
@note The "system_stm32f30x.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 "STM32F30x_Clock_Configuration_V1.0.0.xls" 
      provided with the AN4152 package available on <a href="http://www.st.com/internet/mcu/family/141.jsp">  ST Microcontrollers </a>
         
@par Hardware and Software environment

  - This example runs on STM32F303xC and STM32F303xE Devices.
  
  - This example has been tested with STMicroelectronics STM32303C-EVAL (STM32F30x)
    evaluation board and can be easily tailored to any other supported device 
    and development board.

  - STM32303C-EVAL Set-up
    - Use LED1, LED2, LED3 and LED4 connected respectively to PE.08, PE.09, PE.10
      and PE.11 pins
    - Use KEY Push Button connected to PE.06 
    - Use SEL Push Button connected to PC.13 
    - Connect a female/female CAN cable between at least 2 EVAL CAN connectors (CN3)
    - Jumper JP3 must be fitted.
    - Jumper JP4 must be fitted in 1-2 position.

@par 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
   Projects\STM32F30x_StdPeriph_Templates
 - Open your preferred toolchain
 - Add the following files to the project source list
    - Utilities\STM32_EVAL\STM32303C_EVAL\stm32303c_eval.c
    - Utilities\STM32_EVAL\STM32303C_EVAL\stm32303c_eval_lcd.c 
 - Rebuild all files and load your image into target memory
 - Run the example
  

 */
