wenkong_junshi/Examples/CAN/communication_Loopback/readme.txt

/*!
    \file    readme.txt
    \brief   description of the communication_Loopback demo
    
    \version 2017-02-10, V1.0.0, firmware for GD32F30x
    \version 2018-10-10, V1.1.0, firmware for GD32F30x
    \version 2018-12-25, V2.0.0, firmware for GD32F30x
    \version 2020-09-30, V2.1.0, firmware for GD32F30x
*/

/*
    Copyright (c) 2020, GigaDevice Semiconductor Inc.

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are permitted provided that the following conditions are met:

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       may be used to endorse or promote products derived from this software without 
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*/

  This demo is based on the GD32307C-EVAL-V1.1 board, it shows how to set a communication 
with the CAN in loopback mode.

  The example first performs a transmission and a reception of a standard data frame 
by polling at 125 Kbps.If the received frame is successful, the LED2 and LED3 are on. 
Otherwise,the LED2 and LED3 are off. Then, an extended data frame is transmitted at 
125 Kbps. Reception is done in the interrupt handler when the message becomes pending 
in the FIFO1. If the received frame is successful, the LED4 and LED5 are on. Otherwise,
the LED4 and LED5 are off.
    
  User can select CAN0 or CAN1 cell using the private defines in main.c.
  
  P2,P3 and P4 must be fitted.