gd32定时器输出pwm波

首先，需要配置定时器的工作模式为 PWM 模式，然后设置定时器的周期和占空比即可输出 PWM 波。以下是使用 GD32F4xx 标准库的代码示例：

#include "gd32f4xx.h"

void timer_pwm_init(void)
{
    /* 使能定时器时钟 */
    rcu_periph_clock_enable(RCU_TIMER0);

    /* 配置定时器的工作模式为 PWM 模式 */
    timer_oc_parameter_struct timer_ocinitpara;
    timer_parameter_struct timer_initpara;
    timer_deinit(TIMER0);
    timer_struct_para_init(&timer_initpara);
    timer_initpara.prescaler         = 0;  // 定时器分频系数
    timer_initpara.alignedmode       = TIMER_COUNTER_EDGE;  // 边沿对齐计数模式
    timer_initpara.counterdirection  = TIMER_COUNTER_UP;  // 向上计数模式
    timer_initpara.period            = 999;  // 定时器周期
    timer_init(TIMER0, &timer_initpara);

    /* 配置定时器的输出通道 */
    timer_channel_output_struct_para_init(&timer_ocinitpara);
    timer_ocinitpara.outputstate     = TIMER_CCX_ENABLE;  // 使能输出通道
    timer_ocinitpara.ocpolarity      = TIMER_OC_POLARITY_HIGH;  // 输出极性为高电平
    timer_ocinitpara.ocnpolarity     = TIMER_OCN_POLARITY_HIGH;  // 输出互补极性为高电平
    timer_ocinitpara.ocidlestate     = TIMER_OC_IDLE_STATE_LOW;  // 输出空闲状态为低电平
    timer_ocinitpara.ocnidlestate    = TIMER_OCN_IDLE_STATE_LOW;  // 输出互补空闲状态为低电平
    timer_channel_output_config(TIMER0, TIMER_CH_0, &timer_ocinitpara);

    /* 设置定时器的占空比 */
    timer_channel_output_pulse_value_config(TIMER0, TIMER_CH_0, 500);  // 占空比为 50%

    /* 使能定时器 */
    timer_enable(TIMER0);
}

int main(void)
{
    timer_pwm_init();

    while (1) {
        // do something
    }
}