PWC — 睡眠 + USART1 唤醒

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#include "at32f403a_407_board.h"
#include "at32f403a_407_clock.h"

void usart1_config(uint32_t baudrate)
{
  gpio_init_type gpio_init_struct;

  /* enable the uart1 and gpio clock */
  crm_periph_clock_enable(CRM_USART1_PERIPH_CLOCK, TRUE);
  crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);

  gpio_default_para_init(&gpio_init_struct);

  /* configure the uart1 tx pin */
  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
  gpio_init_struct.gpio_mode           = GPIO_MODE_MUX;
  gpio_init_struct.gpio_pull           = GPIO_PULL_NONE;
  gpio_init_struct.gpio_pins           = GPIO_PINS_9;
  gpio_init(GPIOA, &gpio_init_struct);

  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init_struct.gpio_out_type       = GPIO_OUTPUT_PUSH_PULL;
  gpio_init_struct.gpio_mode           = GPIO_MODE_INPUT;
  gpio_init_struct.gpio_pull           = GPIO_PULL_UP;
  gpio_init_struct.gpio_pins           = GPIO_PINS_10;
  gpio_init(GPIOA, &gpio_init_struct);

  /* configure uart param */
  nvic_irq_enable(USART1_IRQn, 0, 0);

  usart_init(USART1, baudrate, USART_DATA_8BITS, USART_STOP_1_BIT);
  usart_parity_selection_config(USART1, USART_PARITY_NONE);
  usart_transmitter_enable(USART1, TRUE);
  usart_receiver_enable(USART1, TRUE);
  usart_hardware_flow_control_set(USART1,USART_HARDWARE_FLOW_NONE);
  usart_interrupt_enable(USART1, USART_RDBF_INT, TRUE);
  usart_enable(USART1, TRUE);
}

int main(void)
{
  __IO uint32_t index = 0;
  __IO uint32_t systick_index = 0;

  /* congfig the system clock */
  system_clock_config();

  /* init at start board */
  at32_board_init();

  /* config priority group */
  nvic_priority_group_config(NVIC_PRIORITY_GROUP_4);

  /* turn on the led light */
  at32_led_on(LED2);
  at32_led_on(LED3);
  at32_led_on(LED4);

  /* enable pwc clock */
  crm_periph_clock_enable(CRM_PWC_PERIPH_CLOCK, TRUE);

  /* config usart1 */
  usart1_config(115200);

  printf("exit sleep mode by usart1 rdbf interrupt \r\n");

  while(1)
  {
    at32_led_off(LED2);
    at32_led_off(LED3);
    printf("now enter sleep mode \r\n");

    /* save systick register configuration */
    systick_index = SysTick->CTRL;
    systick_index &= ~((uint32_t)0xFFFFFFFE);

    /* disable systick */
    SysTick->CTRL &= (uint32_t)0xFFFFFFFE;

    /* enter sleep mode */
    pwc_sleep_mode_enter(PWC_SLEEP_ENTER_WFI);

    /* restore systick register configuration */
    SysTick->CTRL |= systick_index;

    /* wake up from sleep mode */
    printf("now exit sleep mode by usart1 rdbf interrupt \r\n");

    at32_led_on(LED2);
    delay_ms(500);
  }
}