文件夹：TIMER2_pwminputcapture主函数：
/*!
\file main.c
\brief TIMER2 PWM input capture demo for gd32f30x
\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.
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 "gd32f30x.h"
#include <stdio.h>
#include "gd32f307c_eval.h"
#include "systick.h"
extern __IO uint16_t dutycycle;
extern __IO uint16_t frequency;
void gpio_configuration(void);
void timer_configuration(void);
void nvic_configuration(void);
int fputc(int ch, FILE *f);
/* retarget the C library printf function to the USART */
int fputc(int ch, FILE *f)
{
usart_data_transmit(EVAL_COM1, (uint8_t)ch);
while(RESET == usart_flag_get(EVAL_COM1, USART_FLAG_TBE));
return ch;
}
/*!
\brief configure the GPIO ports
\param[in] none
\param[out] none
\retval none
*/
void gpio_configuration(void)
{
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_AF);
/*configure PA6 (TIMER2 CH0) as alternate function*/
gpio_init(GPIOA,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_50MHZ,GPIO_PIN_6);
}
/*!
\brief configure the nested vectored interrupt controller
\param[in] none
\param[out] none
\retval none
*/
void nvic_configuration(void)
{
nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
nvic_irq_enable(TIMER2_IRQn, 1, 1);
}
/*!
\brief configure the TIMER peripheral
\param[in] none
\param[out] none
\retval none
*/
void timer_configuration(void)
{
/* TIMER2 configuration: PWM input mode ------------------------
the external signal is connected to TIMER2 CH0 pin
the rising edge is used as active edge
the TIMER2 CH0CV is used to compute the frequency value
the TIMER2 CH1CV is used to compute the duty cycle value
------------------------------------------------------------ */
timer_ic_parameter_struct timer_icinitpara;
timer_parameter_struct timer_initpara;
rcu_periph_clock_enable(RCU_TIMER2);
timer_deinit(TIMER2);
/* TIMER2 configuration */
timer_initpara.prescaler = 119;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 65535;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER2,&timer_initpara);
/* TIMER2 configuration */
/* TIMER2 CH0 PWM input capture configuration */
timer_icinitpara.icpolarity = TIMER_IC_POLARITY_RISING;
timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
timer_icinitpara.icfilter = 0x0;
timer_input_pwm_capture_config(TIMER2,TIMER_CH_0,&timer_icinitpara);
/* slave mode selection: TIMER2 */
timer_input_trigger_source_select(TIMER2,TIMER_SMCFG_TRGSEL_CI0FE0);
timer_slave_mode_select(TIMER2,TIMER_SLAVE_MODE_RESTART);
/* select the master slave mode */
timer_master_slave_mode_config(TIMER2,TIMER_MASTER_SLAVE_MODE_ENABLE);
/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER2);
/* clear channel 0 interrupt bit */
timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH0);
/* channel 0 interrupt enable */
timer_interrupt_enable(TIMER2,TIMER_INT_CH0);
/* TIMER2 counter enable */
timer_enable(TIMER2);
}
/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{
systick_config();
gpio_configuration();
gd_eval_com_init(EVAL_COM1);
nvic_configuration();
timer_configuration();
while (1){
delay_1ms(1000);
printf("\r /**** TIMER2 PWM Input Capture Demo ****/\r\n");
printf("the dutycycle is %d\n",dutycycle);
printf("the frequence is %d\n",frequency);
}
}
gd32f30x_it.c：
/*!
\file gd32f30x_it.c
\brief interrupt service routines for gd32f30x
\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.
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 "gd32f30x_it.h"
#include <stdio.h>
#include "systick.h"
uint32_t ic1value = 0,ic2value = 0;
__IO uint16_t dutycycle = 0;
__IO uint16_t frequency = 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)
{
delay_decrement();
}
/*!
\brief this function handles TIMER2 interrupt request.
\param[in] none
\param[out] none
\retval none
*/
void TIMER2_IRQHandler(void)
{
if(SET == timer_interrupt_flag_get(TIMER2,TIMER_INT_FLAG_CH0)){
/* clear channel 0 interrupt bit */
timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH0);
/* read channel 0 capture value */
ic1value = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_0)+1;
if(0 != ic1value){
/* read channel 1 capture value */
ic2value = timer_channel_capture_value_register_read(TIMER2,TIMER_CH_1)+1;
/* calculate the duty cycle value */
dutycycle = (ic2value * 100) / ic1value;
/* calculate the frequency value */
frequency = 1000000 / ic1value;
}else{
dutycycle = 0;
frequency = 0;
}
}
}
有没有大神指点一下，问题出在什么位置？衷心感谢！
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