Does anyone know how to initialize the input capture function of GD32?

bigbat

Does anyone know how to initialize the input capture function of GD32? [Copy link]

The following code is the input capture function of GD32F303CBT6 that I wrote according to the information on the Internet. It uses PA0 and TIME4_CH0. The PA0 pin has input a 50% signal of 1KHZ.

#include "gd32f30x.h"
#include "gd32f303c_start.h"
#include "systick.h"


void timer_config4(void);
/*!
    \brief      main function
    \param[in]  none
    \param[out] none
    \retval     none
*/

int main(void)
{
    /* configure systick */
    systick_config();
    
    /* enable the LEDs GPIO clock */
    rcu_periph_clock_enable(RCU_GPIOB);
    /* configure LED1 LED2 GPIO port */
    gpio_init(GPIOB, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_1);
    /*Configure PA0(TIMER4_CH0) as alternate function*/
	  gpio_init(GPIOA, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_0);
		timer_config4();
    /* reset LED1 LED2 GPIO pin */
    gpio_bit_reset(GPIOB, GPIO_PIN_1);

    while(1){

        gpio_bit_set(GPIOB, GPIO_PIN_1);
        delay_1ms(1000);
        gpio_bit_reset(GPIOB, GPIO_PIN_1);
        delay_1ms(1000);
    }
}

/**
    \brief      configure the TIMER peripheral
    \param[in]  none
    \param[out] none
    \retval     none
  */
void timer_config4(void)
{
    
	  
	  /* TIMER1 configuration: generate PWM signals with different duty cycles:
       TIMER1CLK = SystemCoreClock / 120 = 1MHz */
    timer_ic_parameter_struct timer_icinitpara;
    timer_parameter_struct timer_initpara;

		/* connect IRC40K clock to the TIMER4_CH3 input for calibration */
		//rcu_periph_clock_enable(RCU_AF);
		//gpio_pin_remap_config(GPIO_TIMER4CH3_IREMAP, ENABLE);
		rcu_periph_clock_enable(RCU_TIMER4);
		timer_deinit(TIMER4);
	
	  nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
    nvic_irq_enable(TIMER4_IRQn, 1, 1);     
		/* initialize TIMER init parameter struct */
		timer_struct_para_init(&timer_initpara);
		/* TIMER4 configuration */
		timer_initpara.prescaler = 71;
		timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
		timer_initpara.counterdirection = TIMER_COUNTER_UP;
		timer_initpara.period = 0xFFFF;
		timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
		timer_init(TIMER4, &timer_initpara);

		/* TIMER4 configuration */
		/* initialize TIMER channel input parameter struct */
		timer_channel_input_struct_para_init(&timer_icinitpara);
		/* TIMER4 CH3 input capture configuration */
		timer_icinitpara.icpolarity = TIMER_IC_POLARITY_FALLING;
		timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
		timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
		timer_icinitpara.icfilter = 0x0;
		timer_input_capture_config(TIMER4, TIMER_CH_0, &timer_icinitpara);
		
		
		/* auto-reload preload enable */
		timer_auto_reload_shadow_enable(TIMER4);
		/* clear channel 3 interrupt bit */
		//timer_interrupt_flag_clear(TIMER4, TIMER_INT_FLAG_CH0);
		timer_interrupt_flag_clear(TIMER4, TIMER_INT_CH0);
		/* channel 3 interrupt enable */
		timer_interrupt_enable(TIMER4, TIMER_INT_CH0);
		/* TIMER4 counter enable */
		timer_enable(TIMER4);

}

Interrupt code

void TIMER4_IRQHandler(void)
{
		 if(SET == timer_interrupt_flag_get(TIMER4, TIMER_INT_CH0)){
			 /* clear channel 3 interrupt bit */
			 timer_interrupt_flag_clear(TIMER4, TIMER_INT_CH0);
			 timer_capture_num++;
		 if(1 == timer_capture_num){
					/* get the input capture value */
					timer_capture1 = timer_channel_capture_value_register_read(TIMER4,TIMER_CH_0);
		 }else if(2 == timer_capture_num){
					/* get the input capture value */
					timer_capture2 = timer_channel_capture_value_register_read(TIMER4,TIMER_CH_0);
					/* end capture, disable TIMER4 and CH3 interrupt */
					timer_interrupt_disable(TIMER4, TIMER_INT_CH0);
					timer_disable(TIMER4);
				}
		 }
}

After the program is running, it cannot enter the interruption state. Please give me some advice if you have done this before.

恩佐法拉利

From the code it seems that the interrupt is not enabled

bigbat

Enzo Ferrari posted on 2022-11-3 17:36 From the code, it seems that interrupts are not enabled

Hello, what kind of interrupt is this? The interrupts for the entire system have been enabled.

nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
nvic_irq_enable(TIMER4_IRQn, 1, 1);

TIME4 interruption has also been opened

lugl4313820

The official has already had a routine.

秦天qintian0303

rcu_periph_clock_enable(RCU_AF);Is the AF function enabled?