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NSPE/Example/TIMER/TIMER2_inputcapture/main.c
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149
NSPE/Example/TIMER/TIMER2_inputcapture/main.c
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/*!
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\file main.c
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\brief TIMER2 input capture demo for gd32w51x
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\version 2021-10-30, V1.0.0, firmware for GD32W51x
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*/
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/*
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Copyright (c) 2021, GigaDevice Semiconductor Inc.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this
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list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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OF SUCH DAMAGE.
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*/
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#include "gd32w51x.h"
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#include <stdio.h>
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#include "gd32w515p_eval.h"
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void gpio_configuration(void);
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void timer_configuration(void);
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void nvic_configuration(void);
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int fputc(int ch, FILE *f);
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extern __IO uint32_t count;
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extern __IO float fre;
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/* retarget the C library printf function to the USART */
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int fputc(int ch, FILE *f)
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{
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usart_data_transmit(EVAL_COM0, (uint8_t)ch);
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while(RESET == usart_flag_get(EVAL_COM0, USART_FLAG_TBE));
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return ch;
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}
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/*!
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\brief configure the GPIO ports
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\param[in] none
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\param[out] none
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\retval none
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*/
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void gpio_configuration(void)
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{
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rcu_periph_clock_enable(RCU_GPIOA);
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/*configure PA6 (TIMER2 CH0) as alternate function*/
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gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_6);
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gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_166MHZ,GPIO_PIN_6);
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gpio_af_set(GPIOA, GPIO_AF_2, GPIO_PIN_6);
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}
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/*!
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\brief configure the nested vectored interrupt controller
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\param[in] none
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\param[out] none
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\retval none
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*/
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void nvic_configuration(void)
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{
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nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
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nvic_irq_enable(TIMER2_IRQn, 1, 0);
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}
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/*!
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\brief configure the TIMER peripheral
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\param[in] none
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\param[out] none
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\retval none
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*/
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void timer_configuration(void)
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{
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/* TIMER2 configuration: input capture mode -------------------
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the external signal is connected to TIMER2 CH0 pin (PB4)
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the rising edge is used as active edge
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the TIMER2 CH0CV is used to compute the frequency value
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------------------------------------------------------------ */
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timer_ic_parameter_struct timer_icinitpara;
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timer_parameter_struct timer_initpara;
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rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
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rcu_periph_clock_enable(RCU_TIMER2);
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timer_deinit(TIMER2);
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/* TIMER2 configuration */
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timer_initpara.prescaler = 179;
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timer_initpara.alignedmode = TIMER_COUNTER_EDGE;
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timer_initpara.counterdirection = TIMER_COUNTER_UP;
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timer_initpara.period = 65535;
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timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
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timer_initpara.repetitioncounter = 0;
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timer_init(TIMER2,&timer_initpara);
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/* TIMER2 configuration */
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/* TIMER2 CH0 input capture configuration */
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timer_icinitpara.icpolarity = TIMER_IC_POLARITY_RISING;
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timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;
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timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;
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timer_icinitpara.icfilter = 0x0;
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timer_input_capture_config(TIMER2,TIMER_CH_0,&timer_icinitpara);
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/* auto-reload preload enable */
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timer_auto_reload_shadow_enable(TIMER2);
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/* clear channel 0 interrupt bit */
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timer_interrupt_flag_clear(TIMER2,TIMER_INT_FLAG_CH0);
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/* channel 0 interrupt enable */
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timer_interrupt_enable(TIMER2,TIMER_INT_CH0);
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/* TIMER2 counter enable */
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timer_enable(TIMER2);
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}
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/*!
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\brief main function
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\param[in] none
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\param[out] none
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\retval none
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*/
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int main(void)
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{
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gpio_configuration();
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gd_eval_com_init(EVAL_COM0);
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nvic_configuration();
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timer_configuration();
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while (1){
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printf("\r /**** TIMER2 Input Capture Demo ****/\r\n");
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printf("the frequence is %f\n",fre);
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}
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}
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