136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
/*!
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\file main.c
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\brief TIMER1 extclock count 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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/* configure the TIMER peripheral */
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void timer_config(void);
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/* configure the TIMER1 peripheral */
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void nvic_config(void);
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/* configure the TIMER1 GPIO */
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void gpio_config(void);
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/*!
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\brief configure the TIMER1 interrupt
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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_config(void)
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{
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nvic_priority_group_set(NVIC_PRIGROUP_PRE1_SUB3);
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nvic_irq_enable(TIMER1_IRQn, 1, 1);
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}
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/*!
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\brief configure the TIMER1 GPIO
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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_config(void)
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{
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rcu_periph_clock_enable(RCU_GPIOA);
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/*configure PA0(TIMER1 CH0) as alternate function*/
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gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO_PIN_0);
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gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_166MHZ,GPIO_PIN_0);
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gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_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_config(void)
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{
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/* ----------------------------------------------------------------------------
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TIMER1 Configuration:
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TIMER1 count with external clock, the prescaler is 0, the period is 1000.
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---------------------------------------------------------------------------- */
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timer_parameter_struct timer_initpara;
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timer_ic_parameter_struct timer_icinitpara;
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rcu_periph_clock_enable(RCU_TIMER1);
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timer_deinit(TIMER1);
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/* initialize TIMER init parameter struct */
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timer_struct_para_init(&timer_initpara);
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/* TIMER1 configuration */
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timer_initpara.prescaler = 0;
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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 = 999;
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timer_initpara.clockdivision = TIMER_CKDIV_DIV1;
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timer_init(TIMER1, &timer_initpara);
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/* TIMER1 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 = 0x01;
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timer_input_capture_config(TIMER1, TIMER_CH_0, &timer_icinitpara);
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/* slave mode selection : TIMER1 */
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/* TIMER1 input trigger : external trigger connected to CI0 */
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timer_input_trigger_source_select(TIMER1,TIMER_SMCFG_TRGSEL_CI0FE0);
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timer_slave_mode_select(TIMER1,TIMER_SLAVE_MODE_EXTERNAL0);
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/* enable the TIMER interrupt */
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timer_interrupt_flag_clear(TIMER1, TIMER_INT_FLAG_UP);
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timer_interrupt_enable(TIMER1, TIMER_INT_UP);
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timer_enable(TIMER1);
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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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gd_eval_led_init(LED2);
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gpio_config();
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nvic_config();
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timer_config();
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while (1);
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}
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