另外附上在GD标准库main()函数基础上修改的代码，已测试验证过。
/*!
\file main.c
\brief TIMER0 complementary signals 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 <stdio.h>
#include "gd32f30x_it.h"
#include "systick.h"
void gpio_config(void);
void timer0_config(void);
extern uint32_t timer0tick;
/*!
\brief configure the GPIO ports
\param[in] none
\param[out] none
\retval none
*/
void gpio_config(void) {
rcu_periph_clock_enable(RCU_GPIOC);
/*cofig PC11 as output PP mdoe*/
gpio_init(GPIOC, GPIO_MODE_OUT_PP, GPIO_OSPEED_2MHZ, GPIO_PIN_11);
}
void timer0_gpio_config(void)
{
rcu_periph_clock_enable(RCU_GPIOE);
rcu_periph_clock_enable(RCU_AF);
/*configure PE9 PE14(TIMER0 CH0 CH3) as alternate function*/
gpio_init(GPIOE,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_10MHZ,GPIO_PIN_9|GPIO_PIN_14);
/*
* GD32F30x标准库提供的例程虽然在GPIO初始化时有注释“configre xxx as alternate function”，
* 但是只对GPIO做了基本的初始化，并未进行端口重映射，当然这一点对于老手来说应该很容易注意到，
* 但是对外设配置不熟悉的新人来说很容易被误导，注意添加下方的端口重映射函数！
*/
gpio_pin_remap_config(GPIO_TIMER0_FULL_REMAP, ENABLE);
}
/*!
\brief configure the TIMER peripheral
\param[in] none
\param[out] none
\retval none
*/
void timer0_config(void)
{
timer_parameter_struct timer_initpara;
timer_ic_parameter_struct timer_icinitpara;
timer0_gpio_config();
rcu_periph_clock_enable(RCU_TIMER0);
timer_deinit(TIMER0);
/*NVIC config*/
nvic_irq_enable(TIMER0_UP_TIMER9_IRQn, 1, 1);
nvic_irq_enable(TIMER0_Channel_IRQn, 1, 0);
/* TIMER0 configuration */
timer_initpara.prescaler = 119;
timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection = TIMER_COUNTER_UP;
timer_initpara.period = 999;
timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0, &timer_initpara);
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_capture_config(TIMER0, TIMER_CH_0, &timer_icinitpara);
timer_input_capture_config(TIMER0, TIMER_CH_3, &timer_icinitpara);
/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER0);
timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH0);
timer_interrupt_flag_clear(TIMER0,TIMER_INT_FLAG_CH3);
timer_interrupt_enable(TIMER0,TIMER_INT_CH0);
timer_interrupt_enable(TIMER0,TIMER_INT_CH3);
timer_interrupt_enable(TIMER0,TIMER_INT_UP);
timer_enable(TIMER0);
}
void gpio_togglepin(uint32_t gpio_periph, uint32_t pin) {
if ( GPIO_OCTL(gpio_periph) & pin) {
GPIO_BC(gpio_periph) = pin;
}
else {
GPIO_BOP(gpio_periph) = pin;
}
}
/*!
\brief main function
\param[in] none
\param[out] none
\retval none
*/
int main(void)
{
static uint32_t tick = 0;
nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2);
systick_config();
gpio_config();
timer0_config();
tick = timer0tick;
while (1) {
gpio_bit_set(GPIOC, GPIO_PIN_11);
delay_1ms(500);
gpio_bit_reset(GPIOC, GPIO_PIN_11);
delay_1ms(500);
}
}
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