/*! \file main.c \brief TIMER1 external trigger demo for gd32f30x \version 2017-02-10, V1.0.0, firmware for GD32F30x \version 2018-10-10, V1.1.0, firmware for GD32F30x \version 2018-12-25, V2.0.0, firmware for GD32F30x \version 2020-09-30, V2.1.0, firmware for GD32F30x */ /* Copyright (c) 2020, GigaDevice Semiconductor Inc. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "gd32f30x.h" #include #include "gd32f307c_eval.h" void gpio_config(void); void timer_config(void); /*! \brief configure the GPIO ports \param[in] none \param[out] none \retval none */ void gpio_config(void) { rcu_periph_clock_enable(RCU_GPIOA); rcu_periph_clock_enable(RCU_AF); /*configure PA2(TIMER1 CH2) as alternate function*/ gpio_init(GPIOA,GPIO_MODE_AF_PP,GPIO_OSPEED_50MHZ,GPIO_PIN_2); /*configure PA0(TIMER1 CH0) as floating function*/ gpio_init(GPIOA,GPIO_MODE_IN_FLOATING,GPIO_OSPEED_50MHZ,GPIO_PIN_0); } /*! \brief configure the TIMER peripheral \param[in] none \param[out] none \retval none */ void timer_config(void) { /* Timer with an external trigger ------------------------------------- TIMER1 is configured as slave timer for an external trigger connected to TIMER1 CI0 pin : - The TIMER1 CI0FE0 is used as trigger input - rising edge is used to start the TIMER1: event mode. - TIMER1 CH2 is used PWM0 Mode the starts of the TIMER1 counter are controlled by the external trigger. -------------------------------------------------------------------- */ timer_oc_parameter_struct timer_ocinitpara; timer_parameter_struct timer_initpara; timer_ic_parameter_struct timer_icinitpara; rcu_periph_clock_enable(RCU_TIMER1); timer_deinit(TIMER1); /* TIMER1 configuration */ timer_initpara.prescaler = 119; timer_initpara.alignedmode = TIMER_COUNTER_EDGE; timer_initpara.counterdirection = TIMER_COUNTER_UP; timer_initpara.period = 7999; timer_initpara.clockdivision = TIMER_CKDIV_DIV1; timer_initpara.repetitioncounter = 0; timer_init(TIMER1,&timer_initpara); /* CH2 configuration in OC PWM0 mode */ timer_ocinitpara.ocpolarity = TIMER_OC_POLARITY_HIGH; timer_ocinitpara.ocnpolarity = TIMER_OCN_POLARITY_HIGH; timer_ocinitpara.outputstate = TIMER_CCX_ENABLE; timer_ocinitpara.outputnstate = TIMER_CCXN_DISABLE; timer_ocinitpara.ocidlestate = TIMER_OC_IDLE_STATE_LOW; timer_ocinitpara.ocnidlestate = TIMER_OCN_IDLE_STATE_LOW; timer_channel_output_config(TIMER1,TIMER_CH_2,&timer_ocinitpara); timer_channel_output_pulse_value_config(TIMER1,TIMER_CH_2,3999); timer_channel_output_mode_config(TIMER1,TIMER_CH_2,TIMER_OC_MODE_PWM0); timer_channel_output_shadow_config(TIMER1,TIMER_CH_2,TIMER_OC_SHADOW_DISABLE); /* TIMER1 CH0 input capture configuration */ timer_icinitpara.icpolarity = TIMER_IC_POLARITY_RISING; timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI; timer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1; timer_icinitpara.icfilter = 0x02; timer_input_capture_config(TIMER1,TIMER_CH_0,&timer_icinitpara); /* slave mode selection : TIMER1 */ /* TIMER1 input trigger : external trigger connected to CI0 */ timer_input_trigger_source_select(TIMER1,TIMER_SMCFG_TRGSEL_CI0FE0); timer_slave_mode_select(TIMER1,TIMER_SLAVE_MODE_EVENT); /* auto-reload preload enable */ timer_auto_reload_shadow_enable(TIMER1); } /*! \brief main function \param[in] none \param[out] none \retval none */ int main(void) { gpio_config(); timer_config(); while (1); }