RCU — 时钟输出引脚

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#include "gd32f30x.h"
#include "gd32f307c_eval.h"
#include <stdio.h>
typedef enum {

void all_led_init(void);
void all_led_off(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;
        }
    }
}

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);
}

void all_led_init(void)
{
    gd_eval_led_init(LED2);
    gd_eval_led_init(LED3);
    gd_eval_led_init(LED4);
}