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- /*!
- \file main.c
- \brief RCU clock out demo
- \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.
- All rights reserved.
- 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 "gd32f307c_eval.h"
- #include <stdio.h>
- typedef enum {
- CKOUT0_SYSTEMCLOCK_CKOUT = 0,
- CKOUT0_IRC8M_CKOUT = 1,
- CKOUT0_HXTAL_CKOUT = 2,
- } clock_output_enum;
- void rcu_config(void);
- void gpio_config(void);
- void all_led_init(void);
- void all_led_off(void);
- void led_flash(int times);
- void dac_config(void);
- void clock_output_select(uint8_t seq);
- void clock_output_config(void);
- extern uint8_t g_button_press_flag;
- /*!
- \brief main function
- \param[in] none
- \param[out] none
- \retval none
- */
- int main(void)
- {
- uint8_t func_seq = 0;
- /* initialize the USART */
- gd_eval_com_init(EVAL_COM0);
- printf("\r\n /=========== Gigadevice Clock output Demo ===========/ \r\n");
- printf("press tamper key to select clock output source \r\n");
- /* initialize the LEDs */
- all_led_init();
- /* initialize the clock output */
- clock_output_config();
- /* initialize the tamper key */
- gd_eval_key_init(KEY_TAMPER, KEY_MODE_EXTI);
- while(1) {
- if(1 == g_button_press_flag) {
- /* if the button is pressed */
- g_button_press_flag = 0;
- /* control the led */
- all_led_off();
- gd_eval_led_on((led_typedef_enum)func_seq);
- /* select the clock output mode */
- clock_output_select(func_seq);
- g_button_press_flag = 0;
- func_seq++;
- func_seq %= 3;
- }
- }
- }
- /*!
- \brief all LEDs turn off
- \param[in] none
- \param[out] none
- \retval none
- */
- void all_led_off(void)
- {
- gd_eval_led_off(LED2);
- gd_eval_led_off(LED3);
- gd_eval_led_off(LED4);
- }
- /*!
- \brief configure clock output function
- \param[in] none
- \param[out] none
- \retval none
- */
- void clock_output_config(void)
- {
- /* peripheral clock enable */
- rcu_periph_clock_enable(RCU_GPIOA);
- rcu_periph_clock_enable(RCU_GPIOC);
- rcu_osci_on(RCU_IRC8M);
- if(ERROR == rcu_osci_stab_wait(RCU_IRC8M)) {
- printf("RCU_IRC8M rcu_osci_stab_wait timeout! \r\n");
- while(1);
- }
- /* configure clock output pin */
- gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_8);
- }
- /*!
- \brief select type of clock output
- \param[in] none
- \param[out] none
- \retval none
- */
- void clock_output_select(uint8_t seq)
- {
- switch(seq) {
- case CKOUT0_SYSTEMCLOCK_CKOUT:
- rcu_ckout0_config(RCU_CKOUT0SRC_CKSYS);
- printf("CK_OUT0: system clock \r\n");
- break;
- case CKOUT0_IRC8M_CKOUT:
- rcu_ckout0_config(RCU_CKOUT0SRC_IRC8M);
- printf("CK_OUT0: IRC8M \r\n");
- break;
- case CKOUT0_HXTAL_CKOUT:
- rcu_ckout0_config(RCU_CKOUT0SRC_HXTAL);
- printf("CK_OUT0: HXTAL \r\n");
- break;
- default:
- printf("clock output select parameter error! \r\n");
- while(1);
- }
- }
- /*!
- \brief initialize the LEDs
- \param[in] none
- \param[out] none
- \retval none
- */
- void all_led_init(void)
- {
- gd_eval_led_init(LED2);
- gd_eval_led_init(LED3);
- gd_eval_led_init(LED4);
- }
- /* retarget the C library printf function to the USART */
- int fputc(int ch, FILE *f)
- {
- usart_data_transmit(EVAL_COM0, (uint8_t)ch);
- while(RESET == usart_flag_get(EVAL_COM0, USART_FLAG_TC));
- return ch;
- }
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