器材

• 1x Tequila Nano + RA_LINK 调试器

电路连接

用一根跳线连接和断开 Tequila Nano 的 PA0 引脚和 GND 引脚

原理

代码

/**
 * @file main.c
 * @version 1.0
 * @date 2021-07-28
 *
 */

#include "rath_hal.h"

static void AG_RCU_init(void);
static void AG_ECLIC_init(void);
static void AG_GPIO_init(void);
static void AG_USART0_init(void);


/* this is the interrupt handler for EXTI line 0 */
void EXTI0_IRQHandler() {
  if (1) {
    /* ====== Normal Version ====== */
    printf("interrupt captured at systime %lu\n", HAL_getTimeW());

    /* clear the interrupt flag after each interrupt */
    HAL_EXTI_clearTrigger(EXTI_0);
  }
  else {
    /* ====== Debounced Version ====== */
    /* disable the EXTI interrupt to prevent more interrupts when handling the
     * current interrupt
     */
    HAL_EXTI_disableInterrupt(EXTI_0);
    HAL_EXTI_clearTrigger(EXTI_0);

    printf("interrupt captured at systime %lu\n", HAL_getTimeW());

    /* debounce time */
    HAL_delay(1000);

    /* clear the flag and re-enable the interrupt */
    HAL_EXTI_clearTrigger(EXTI_0);
    HAL_EXTI_enableInterrupt(EXTI_0);
  }
}

int main() {
  AG_RCU_init();
  AG_ECLIC_init();
  AG_GPIO_init();
  AG_USART0_init();

  /* enable the interrupt */
  HAL_EXTI_enableInterrupt(EXTI_0);

  while (1) {
    printf("waiting for EXTI on PA0... %d\n", HAL_EXTI_getTrigger(EXTI_0));
    HAL_delay(1000);
  }
}

static void AG_RCU_init(void) {
  /* EXTI, ECLIC does not have independent RCU clock */
  HAL_RCU_resetPeriphClock(RCU_GPIOA);
  HAL_RCU_resetPeriphClock(RCU_USART0);

  HAL_RCU_enablePeriphClock(RCU_GPIOA);
  HAL_RCU_enablePeriphClock(RCU_USART0);
}

static void AG_ECLIC_init(void) {
  HAL_ECLIC_enableGlobalInterrupt();
  HAL_ECLIC_setPriorityGroup(ECLIC_GROUP_LEVEL4_PRIO0);
}

static void AG_GPIO_init(void) {
  GPIO_InitTypeDef GPIO_init;

  GPIO_init.pin = GPIO_PIN_0;
  GPIO_init.mode = GPIO_MODE_INPUT;
  GPIO_init.speed = GPIO_SPEED_NONE;
  GPIO_init.pull = GPIO_PULL_UP;
  HAL_GPIO_init(GPIOA, &GPIO_init);

  GPIO_init.pin = GPIO_PIN_9;
  GPIO_init.mode = GPIO_MODE_AF_PP;
  GPIO_init.speed = GPIO_SPEED_50MHZ;
  GPIO_init.pull = GPIO_PULL_NONE;
  HAL_GPIO_init(GPIOA, &GPIO_init);

  GPIO_init.pin = GPIO_PIN_10;
  GPIO_init.mode = GPIO_MODE_INPUT;
  GPIO_init.speed = GPIO_SPEED_NONE;
  GPIO_init.pull = GPIO_PULL_NONE;
  HAL_GPIO_init(GPIOA, &GPIO_init);

  /* select PA0 as EXTI source */
  /* PAx corresponds to line x, EXTI_x. In this case, it is EXTI_0 */
  HAL_GPIO_setEXTILine(GPIOA, GPIO_EXTI_LINE_0);

  /* initialize EXTI on line 0 and set trigger on falling edge detection */
  EXTI_InitTypeDef EXTI_init;

  EXTI_init.mode = EXTI_MODE_INTERRUPT;
  EXTI_init.edge = EXTI_EDGE_FALLING;
  HAL_EXTI_init(EXTI_0, &EXTI_init);
  /* clear the flag */
  HAL_EXTI_clearTrigger(EXTI_0);

  HAL_ECLIC_enableIRQ(EXTI0_IRQn, 1, 0);
}

static void AG_USART0_init(void) {
  HAL_USART_disable(USART0);

  USART_InitTypeDef USART0_init;

  USART0_init.mode = USART_MODE_TX_RX;
  USART0_init.baudrate = 115200UL;
  USART0_init.word_length = USART_WORDLENGTH_8BIT;
  USART0_init.stop_bits = USART_STOPBITS_1BIT;
  USART0_init.parity = USART_PARITY_NONE;
  USART0_init.hw_control = USART_HWCONTROL_NONE;
  HAL_USART_init(USART0, &USART0_init);

  HAL_USART_enable(USART0);
}