GD32E230按键软件消抖程序

我这里使用的消抖方式是金沙滩工作室宋老师所讲的方法，用一个定时器，定时 2ms 进一次中断，在中断扫描一次按键状态并且存储起来，连续扫描 8 次后，看看这连续 8 次的按键状态是否是一致的。8 次按键的时间是 16ms，这 16ms 内如果按键状态一直保持一致，那就可以确定现在按键处于稳定的阶段，而非处于抖动的阶段。
本程序所用的按键原理图为

main.c

/*!\file    main.c\brief   TIMER2 oc timebase demo for gd32e23x\version 2019-02-19, V1.0.0, firmware for GD32E23x\version 2020-12-12, V1.1.0, firmware for GD32E23x
*//*Copyright (c) 2020, GigaDevice Semiconductor Inc.Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/#include "gd32e23x.h"
#include <stdio.h>
#include "gd32e230c_eval.h"/* configure the TIMER peripheral */
void timer_config(void);
/* configure the TIMER interrupt */
void nvic_config(void);uint8_t keysta = 0xff,backup = 0xff;
uint8_t cnt = 0;/**\brief      configure the TIMER interrupt\param[in]  none\param[out] none\retval     none*/
void nvic_config(void)
{nvic_irq_enable(TIMER0_BRK_UP_TRG_COM_IRQn, 0);
}/**\brief      configure the TIMER peripheral\param[in]  none\param[out] none\retval     none*/
void timer_config(void)
{/* ----------------------------------------------------------------------------TIMER2 Configuration: TIMER2CLK = SystemCoreClock/(7200*9) = 1.111KHz,the period is 1s(1111/555555 = 2ms).1.0986khz    /54930  5ms(period*prescaler)/systemcoreclock = you want to set time---------------------------------------------------------------------------- */timer_oc_parameter_struct timer_ocinitpara;timer_parameter_struct timer_initpara;/* enable the peripherals clock */rcu_periph_clock_enable(RCU_TIMER0);/* deinit a TIMER */timer_deinit(TIMER0);/* initialize TIMER init parameter struct */timer_struct_para_init(&timer_initpara);/* TIMER2 configuration */timer_initpara.prescaler         = 7199;timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;timer_initpara.counterdirection  = TIMER_COUNTER_UP;timer_initpara.period            = 19;timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;timer_init(TIMER0, &timer_initpara);/* clear channel 0 interrupt bit */timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_UP);/* enable the TIMER interrupt */timer_interrupt_enable(TIMER0, TIMER_INT_UP);/* enable a TIMER */timer_enable(TIMER0);
}void KeyScan()
{if (keysta != backup) {if (backup == 0x00)   {cnt++;if(cnt%2){gd_eval_led_on(LED1);}else{gd_eval_led_off(LED1);}}backup = keysta;   }
}
/*!\brief      main function\param[in]  none\param[out] none\retval     none
*/
int main(void)
{/* configure led GPIO */gd_eval_led_init(LED1);/* configure the TIMER peripheral */timer_config();/* configure the TIMER2 interrupt */nvic_config();while (1){KeyScan();}
}

gd32e23x_it.c

/*!\file    gd32e23x_it.c\brief   interrupt service routines\version 2019-02-19, V1.0.0, firmware for GD32E23x\version 2020-12-12, V1.1.0, firmware for GD32E23x
*//*Copyright (c) 2020, GigaDevice Semiconductor Inc.Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/#include "gd32e23x_it.h"
#include "gd32e230c_eval.h"extern uint8_t keysta ;
uint32_t cnt11 = 0;/*!\brief      this function handles NMI exception\param[in]  none\param[out] none\retval     none
*/
void NMI_Handler(void)
{}/*!\brief      this function handles HardFault exception\param[in]  none\param[out] none\retval     none
*/
void HardFault_Handler(void)
{/* if Hard Fault exception occurs, go to infinite loop */while (1){}
}/*!\brief      this function handles MemManage exception\param[in]  none\param[out] none\retval     none
*/
void MemManage_Handler(void)
{/* if Memory Manage exception occurs, go to infinite loop */while (1){}
}/*!\brief      this function handles BusFault exception\param[in]  none\param[out] none\retval     none
*/
void BusFault_Handler(void)
{/* if Bus Fault exception occurs, go to infinite loop */while (1){}
}/*!\brief      this function handles UsageFault exception\param[in]  none\param[out] none\retval     none
*/
void UsageFault_Handler(void)
{/* if Usage Fault exception occurs, go to infinite loop */while (1){}
}/*!\brief      this function handles SVC exception\param[in]  none\param[out] none\retval     none
*/
void SVC_Handler(void)
{}/*!\brief      this function handles DebugMon exception\param[in]  none\param[out] none\retval     none
*/
void DebugMon_Handler(void)
{}/*!\brief      this function handles PendSV exception\param[in]  none\param[out] none\retval     none
*/
void PendSV_Handler(void)
{}/*!\brief      this function handles SysTick exception\param[in]  none\param[out] none\retval     none
*/
void SysTick_Handler(void)
{}/*** @brief  This function handles TIMER0 interrupt request.* @param  None* @retval None*/
void TIMER0_BRK_UP_TRG_COM_IRQHandler(void)
{static unsigned char keybuf = 0xff;if(SET == timer_interrupt_flag_get(TIMER0, TIMER_INT_FLAG_UP)){/* clear channel 0 interrupt bit */timer_interrupt_flag_clear(TIMER0, TIMER_INT_FLAG_UP);
//        cnt11++;
//        if(cnt11%2)
//        {//            gd_eval_led_on(LED1);
//        }
//        else
//        {//            gd_eval_led_off(LED1);
//        }/* toggle selected led */if(RESET == gpio_input_bit_get(GPIOB,GPIO_PIN_6)){keybuf = (keybuf<<1) | 0x01;}else{keybuf = (keybuf<<1) | 0x00;}if(keybuf == 0x00){keysta = 0x00;}else if (keybuf == 0xff){keysta = 0xFF;}else{}}
}

工程如下
https://download.csdn.net/download/wyc3251/85093508

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