104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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Clock source selection routine:
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This example demonstrates two external clock source modes of TIM1.
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External clock source mode 1: PA8 is used as clock input pin,
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External clock source mode 2: PA12 is used as clock input pin.
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*/
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#include "debug.h"
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/* External Clock Mode Definition */
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#define ETR_CLK_MODE1 0
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#define ETR_CLK_MODE2 1
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/* External Clock Mode Selection */
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#define ETR_CLK ETR_CLK_MODE1
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//#define ETR_CLK ETR_CLK_MODE2
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/*********************************************************************
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* @fn TIM1_ETRClockMode1_Init
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*
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* @brief Configures the External clock Mode1.
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*
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* @return none
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*/
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void TIM1_ETRClockMode1_Init(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
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TIM_CounterModeConfig(TIM1, TIM_CounterMode_Up);
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TIM_SetAutoreload(TIM1, 0x3EB);
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TIM_ETRClockMode1Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0x0);
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/* GPIOA8 Input as TIM Clock Source */
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TIM_TIxExternalClockConfig(TIM1, TIM_TIxExternalCLK1Source_TI1, TIM_ICPolarity_Rising, 0x00);
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TIM_Cmd(TIM1, ENABLE);
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}
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/*********************************************************************
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* @fn TIM1_ETRClockMode2_Init
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*
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* @brief Configures the External clock Mode2.
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*
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* @return none
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*/
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void TIM1_ETRClockMode2_Init(void)
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{
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
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TIM_CounterModeConfig(TIM1, TIM_CounterMode_Up);
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TIM_SetAutoreload(TIM1, 0x3EB);
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/* GPIOA12 Input as TIM Clock Source */
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TIM_ETRClockMode2Config(TIM1, TIM_ExtTRGPSC_OFF, TIM_ExtTRGPolarity_Inverted, 0x0);
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TIM_SelectInputTrigger(TIM1, TIM_TS_ETRF);
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TIM_Cmd(TIM1, ENABLE);
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}
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/*********************************************************************
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* @fn main
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*
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* @brief Main program.
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*
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* @return none
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*/
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int main(void)
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{
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USART_Printf_Init(115200);
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printf("SystemClk:%d\r\n", SystemCoreClock);
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#if(ETR_CLK == ETR_CLK_MODE1)
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TIM1_ETRClockMode1_Init();
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#elif(ETR_CLK == ETR_CLK_MODE2)
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TIM1_ETRClockMode2_Init();
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#endif
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while(1)
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{
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if(TIM_GetFlagStatus(TIM1, TIM_FLAG_CC1) != RESET)
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{
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TIM_ClearFlag(TIM1, TIM_FLAG_CC1);
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}
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if(TIM_GetFlagStatus(TIM1, TIM_FLAG_Update) != RESET)
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{
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printf("Count Update\r\n");
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TIM_ClearFlag(TIM1, TIM_FLAG_Update);
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}
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}
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}
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