GD32F407怎么实现动态修改PWM的占空比

只看该作者 · 2020-10-29 13:47

各位楼主，有没有这方面的经验，分一下GD32F407的PWM模块动态修改占空比功能，
/*初始化PWM管脚时钟*/
         rcu_periph_clock_enable(RCU_GPIOC);
         /*Configure PC8 (TIMER2 CH2 ) as alternate function*/
         gpio_mode_set(GPIOC, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_8);
         gpio_output_options_set(GPIOC, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);

         gpio_af_set(GPIOC, GPIO_AF_2, GPIO_PIN_8);

         /*初始化TIMER2时钟*/
         rcu_periph_clock_enable(RCU_TIMER2);
         rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);

         timer_deinit(TIMER2);

         /* TIMER2 configuration */
         //timer_initpara.prescaler       = 199;/*200M(Hz)/(199+1)= 1us*/
         //timer_initpara.prescaler       = 99;/*200M(Hz)/(99+1)= 0.5us*/
         timer_initpara.prescaler       = 9; /*200M(Hz)/(9+1)= 0.05us*/
         timer_initpara.alignedmode    = TIMER_COUNTER_EDGE;
         timer_initpara.counterdirection  = TIMER_COUNTER_UP;
         timer_initpara.period          = 19;/* 1us * (n + 1) = 1 / f Hz*/
         timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
         timer_initpara.repetitioncounter = 0;

         timer_init(TIMER2, &timer_initpara);

         /* CH2 configuration in PWM mode */
         timer_ocintpara.ocpolarity  = TIMER_OC_POLARITY_HIGH;
         timer_ocintpara.outputstate = TIMER_CCX_ENABLE;
         timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
         timer_ocintpara.outputnstate = TIMER_CCXN_DISABLE;
         timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
         timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;

         timer_channel_output_config(TIMER2, TIMER_CH_2, &timer_ocintpara);

         /* CH2 configuration in PWM mode1,duty cycle 50% */
         timer_channel_output_pulse_value_config(TIMER2, TIMER_CH_2, 7);
         timer_channel_output_mode_config(TIMER2, TIMER_CH_2, TIMER_OC_MODE_PWM0);
         timer_channel_output_shadow_config(TIMER2, TIMER_CH_2, TIMER_OC_SHADOW_DISABLE);

         timer_primary_output_config(TIMER2, ENABLE);

         /* auto-reload preload enable */
         timer_auto_reload_shadow_enable(TIMER2);

         /* auto-reload preload enable */
         timer_enable(TIMER2);

只看该作者 · 2020-11-2 22:03

官网的固件库里面就有这方面的demo的，比如F4xx的固件库链接给您http://www.gd32mcu.com/download/down/document_id/247/path_type/1

只看该作者 · 2020-11-2 22:04

本帖最后由 castle520 于 2020-11-2 22:11 编辑

另附设置不同占空比的代码，希望能帮到你，改变占空比调用 timer_channel_output_pulse_value_config()函数即可void gpio_config(void)
{
rcu_periph_clock_enable(RCU_GPIOA);
rcu_periph_clock_enable(RCU_GPIOB);

/*Configure PA8 PA9 PA10(TIMER0 CH0 CH1 CH2) as alternate function*/
gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_8);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_8);

gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_9);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_9);

gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_10);
gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_10);

gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_8);
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_9);
gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_10);

/*Configure PB13 PB14 PB15(TIMER0 CH0N CH1N CH2N) as alternate function*/
gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_13);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_13);

gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_14);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_14);

gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_15);
gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_15);

gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_13);
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_14);
gpio_af_set(GPIOB, GPIO_AF_1, GPIO_PIN_15);
}

/*!
\brief    configure the TIMER peripheral
\param[in]  none
\param[out] none
\retval    none
*/
void timer_config(void)
{
/* -----------------------------------------------------------------------
TIMER0 configuration to:
generate 3 complementary PWM signals with 3 different duty cycles:
TIMER0CLK is fixed to systemcoreclock, the TIMER0 prescaler is equal to 10000 so the
TIMER0 counter clock used is 20KHz.
the three duty cycles are computed as the following description:
the channel 0 duty cycle is set to 25% so channel 1N is set to 75%.
the channel 1 duty cycle is set to 50% so channel 2N is set to 50%.
the channel 2 duty cycle is set to 75% so channel 3N is set to 25%.
  ----------------------------------------------------------------------- */
timer_oc_parameter_struct timer_ocintpara;
timer_parameter_struct timer_initpara;

rcu_periph_clock_enable(RCU_TIMER0);
rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);

timer_deinit(TIMER0);

/* TIMER0 configuration */
timer_initpara.prescaler       = 9999;
timer_initpara.alignedmode    = TIMER_COUNTER_EDGE;
timer_initpara.counterdirection  = TIMER_COUNTER_UP;
timer_initpara.period          = 15999;
timer_initpara.clockdivision    = TIMER_CKDIV_DIV1;
timer_initpara.repetitioncounter = 0;
timer_init(TIMER0,&timer_initpara);

   /* CH1,CH2 and CH3 configuration in PWM mode */
timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;
timer_ocintpara.outputnstate = TIMER_CCXN_ENABLE;
timer_ocintpara.ocpolarity = TIMER_OC_POLARITY_HIGH;
timer_ocintpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;
timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;
timer_ocintpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW;

timer_channel_output_config(TIMER0,TIMER_CH_0,&timer_ocintpara);
timer_channel_output_config(TIMER0,TIMER_CH_1,&timer_ocintpara);
timer_channel_output_config(TIMER0,TIMER_CH_2,&timer_ocintpara);

timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_0,3999);
timer_channel_output_mode_config(TIMER0,TIMER_CH_0,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_0,TIMER_OC_SHADOW_DISABLE);

timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_1,7999);
timer_channel_output_mode_config(TIMER0,TIMER_CH_1,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_1,TIMER_OC_SHADOW_DISABLE);

timer_channel_output_pulse_value_config(TIMER0,TIMER_CH_2,11999);
timer_channel_output_mode_config(TIMER0,TIMER_CH_2,TIMER_OC_MODE_PWM0);
timer_channel_output_shadow_config(TIMER0,TIMER_CH_2,TIMER_OC_SHADOW_DISABLE);

timer_primary_output_config(TIMER0,ENABLE);

/* auto-reload preload enable */
timer_auto_reload_shadow_enable(TIMER0);
timer_enable(TIMER0);
}

/*!
\brief    main function
\param[in]  none
\param[out] none
\retval    none
*/
int main(void)
{
gpio_config();
timer_config();

while (1);
}

只看该作者 · 2020-11-13 13:53

castle520 发表于 2020-11-2 22:04
另附设置不同占空比的代码，希望能帮到你，改变占空比调用 timer_channel_output_pulse_value_config()函数 ...

感谢，问题已解决