/*!
 * @file        readme.txt
 *
 * @brief       This file is routine instruction
 *
 * @version     V1.0.0
 *
 * @date        2025-02-15
 *
 * @attention
 *
 *  Copyright (C) 2025 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.
 */

The program to show how to configure the TMR2 peripheral to generate 4 PWM 
with 4 different duty cycles (80%, 70%, 60%, and 50%).

The objective is to generate 4 PWM signal at 1 KHz:

APM32F411 TINY Devices:
  - SystemCoreClock = 120MHz.
  - TMR2CLK = SystemCoreClock/2 = 60MHz.Prescaler = 59, TMR counter clock = 1 MHz

  - TMR2_Period = (1000000 / 1000) - 1
  - Channel 1 duty cycle = 80%
  - Channel 2 duty cycle = 70%
  - Channel 3 duty cycle = 60%
  - Channel 4 duty cycle = 50%

Display TMR2 waveform by oscilloscope.

&par Hardware Description

  - using TMR2 Channel 1 (PA0) to output PWM
  - using TMR2 Channel 2 (PA1) to output PWM
  - using TMR2 Channel 3 (PA2) to output PWM
  - using TMR2 Channel 4 (PA3) to output PWM

&par Directory contents

  - TMR/TMR_TMR2PWMOutput/Source/apm32f4xx_int.c        Interrupt handlers
  - TMR/TMR_TMR2PWMOutput/Source/main.c                       Main program

&par IDE environment

  - MDK-ARM V5.40
  - EWARM V8.50.5.26295
  - Eclipse V2022-06（4.24.0）

&par Hardware and Software environment

  - This example runs on APM32F411 Tiny Devices.
