CRM — 时钟失效检测

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

static void clkout_config(void);
static void sclk_240m_hick_config(void);
void clock_failure_detection_handler(void);

/**
  * @brief  clkout configuration.
  * @param  none
  * @retval none
  */
static void clkout_config(void)
{
  gpio_init_type gpio_init_struct;

  /* enable gpio port clock */
  crm_periph_clock_enable(CRM_GPIOA_PERIPH_CLOCK, TRUE);

  /* set default parameter */
  gpio_default_para_init(&gpio_init_struct);

  /* clkout gpio init */
  gpio_init_struct.gpio_drive_strength = GPIO_DRIVE_STRENGTH_STRONGER;
  gpio_init_struct.gpio_mode = GPIO_MODE_MUX;
  gpio_init_struct.gpio_pins = GPIO_PINS_8;
  gpio_init_struct.gpio_pull = GPIO_PULL_NONE;
  gpio_init(GPIOA, &gpio_init_struct);

  /* config clkout division */
  crm_clkout_div_set(CRM_CLKOUT_DIV_1);

  /* config clkout clock */
  crm_clock_out_set(CRM_CLKOUT_PLL_DIV_4);
}

static void sclk_240m_hick_config(void)
{
  /* reset crm */
  crm_reset();

  crm_clock_source_enable(CRM_CLOCK_SOURCE_HICK, TRUE);

   /* wait till hick is ready */
  while(crm_flag_get(CRM_HICK_STABLE_FLAG) != SET)
  {
  }

  /* config pll clock resource */
  crm_pll_config(CRM_PLL_SOURCE_HICK, CRM_PLL_MULT_60, CRM_PLL_OUTPUT_RANGE_GT72MHZ);

  /* enable pll */
  crm_clock_source_enable(CRM_CLOCK_SOURCE_PLL, TRUE);

  /* wait till pll is ready */
  while(crm_flag_get(CRM_PLL_STABLE_FLAG) != SET)
  {
  }

  /* config ahbclk */
  crm_ahb_div_set(CRM_AHB_DIV_1);

  /* config apb2clk, the maximum frequency of APB1/APB2 clock is 120 MHz */
  crm_apb2_div_set(CRM_APB2_DIV_2);

  /* config apb1clk, the maximum frequency of APB1/APB2 clock is 120 MHz  */
  crm_apb1_div_set(CRM_APB1_DIV_2);

  /* enable auto step mode */
  crm_auto_step_mode_enable(TRUE);

  /* select pll as system clock source */
  crm_sysclk_switch(CRM_SCLK_PLL);

  /* wait till pll is used as system clock source */
  while(crm_sysclk_switch_status_get() != CRM_SCLK_PLL)
  {
  }

  /* disable auto step mode */
  crm_auto_step_mode_enable(FALSE);

  /* update system_core_clock global variable */
  system_core_clock_update();

  /* config systick delay */
  delay_init();

  /* config clkout */
  clkout_config();
}

int main(void)
{
  system_clock_config();

  at32_board_init();

  /* clkout config */
  clkout_config();

  /* enable clock failure detection */
  crm_clock_failure_detection_enable(TRUE);

  while(1)
  {
    at32_led_toggle(LED2);
    delay_ms(200);
  }
}