/*!
 * @file        readme.txt
 *
 * @brief       This file is routine instruction
 *
 * @version     V1.0.0
 *
 * @date        2022-11-08
 *
 * @attention
 *
 *  Copyright (C) 2022 Geehy Semiconductor
 *
 *  You may not use this file except in compliance with the
 *  GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
 *
 *  The program is only for reference, which is distributed in the hope
 *  that it will be useful and instructional for customers to develop
 *  their software. Unless required by applicable law or agreed to in
 *  writing, the program is distributed on an "AS IS" BASIS, WITHOUT
 *  ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
 *  and limitations under the License.
 */

&par Example Description

This example describes how to use MAX485 module to transfer data
with serial COM. When you send some data from PC to the RS458, then
MCU will send the same data to PC through RS458.

notes:
For this example, the board must be powered with 5V.

The USART2(RS485 COM) is configured as follows:
  - TX:PD5, RX:PD6
  - BaudRate = 9600 baud
  - Word Length = 8 Bits
  - One Stop Bit
  - No parity
  - Hardware flow control disabled (RTS and CTS signals)
  - Receive and transmit enabled

The UART4(Debug COM) is configured as follows:
  - TX:PC10, RX:PC11
  - BaudRate = 115200 baud
  - Word Length = 8 Bits
  - One Stop Bit
  - No parity
  - Hardware flow control disabled (RTS and CTS signals)
  - Receive and transmit enabled

The RS458 module connection as follows:
     _____________                    ____________          ____________
    |             |                  |            |        |            |
    |             |                  |            |-TX  <->|            |
    |             |-MAX485-A <--> A- |            |        |            |
    |             |                  |            |-RX  <->|            |
    | EVAL Board  |                  | 485 module |        |     PC     |
    |             |-MAX485-B <--> B- |            |-VCC <->|            |
    |             |                  |            |        |            |
    |             |                  |            |-GND <->|            |
    |_____________|                  |____________|        |____________|

&par Directory contents 

  - USART/USART_RS458/src/apm32f10x_int.c     Interrupt handlers
  - USART/USART_RS458/src/main.c              Main program

&par IDE environment

  - MDK-ARM V5.29
  - EWARM V8.50.5.26295
  
&par Hardware and Software environment

  - This example runs on APM32F107_EVAL Devices.
