[应用相关] 如何在 AT32F403A, AT32F407, AT32F403, AT32F413, AT32F415, AT32F421 获得 毫秒计时？

typedef struct

{

 __IO uint8_t hour; /*!< specifies the hours of calendar. */

 __IO uint8_t min; /*!< specifies the minutes of calendar. */

 __IO uint8_t sec; /*!< specifies the second of calendar. */

 __IO uint16_t msec; /*!< specifies the millisecond of calendar. */ 

} calendar_type;

calendar_type time_struct;

/* config calendar */

time_struct.hour = 12;

time_struct.min = 0;

time_struct.sec = 0;

time_struct.msec = 100;

rtc_init(&time_struct);

uint8_t rtc_init(calendar_type *calendar)

{

 /* enable pwc and bpr clocks */

 crm_periph_clock_enable(CRM_PWC_PERIPH_CLOCK, TRUE);

 crm_periph_clock_enable(CRM_BPR_PERIPH_CLOCK, TRUE);

 /* enable the battery-powered domain write operations */

 pwc_battery_powered_domain_access(TRUE);

 /* reset battery-powered domain register */

 bpr_reset();

 /* enable the lext osc */

 crm_clock_source_enable(CRM_CLOCK_SOURCE_LEXT, TRUE);

 /* wait lext is ready */

 while(crm_flag_get(CRM_LEXT_STABLE_FLAG) == RESET);

/* select the rtc clock source */

 crm_rtc_clock_select(CRM_RTC_CLOCK_LEXT);

 /* enable rtc clock */

 crm_rtc_clock_enable(TRUE);

 /* wait for rtc registers update */

 rtc_wait_update_finish();

 /* wait for the register write to complete */

 rtc_wait_config_finish();

 

 /* set rtc divider: set rtc period to 1sec */

 rtc_divider_set(32);

 

 /* wait for the register write to complete */

 rtc_wait_config_finish();

 /* set time */

 rtc_time_set(calendar);

 /* writes data to bpr register */

 bpr_data_write(BPR_DATA1, 0x1234);

 

 return 1;

}

void ertc_config(void)

{

 /* enable the pwc clock interface */

 crm_periph_clock_enable(CRM_PWC_PERIPH_CLOCK, TRUE);

 

 /* allow access to ertc */

 pwc_battery_powered_domain_access(TRUE);

 /* reset ertc domain */

 crm_battery_powered_domain_reset(TRUE);

 crm_battery_powered_domain_reset(FALSE);

 

#if defined (ERTC_CLOCK_SOURCE_LICK)

 /* enable the lick osc */

 crm_clock_source_enable(CRM_CLOCK_SOURCE_LICK, TRUE);

 /* wait till lick is ready */

 while(crm_flag_get(CRM_LICK_STABLE_FLAG) == RESET)

 {

 }

/* select the ertc clock source */

 crm_ertc_clock_select(CRM_ERTC_CLOCK_LICK);

 

 /* ertc second(1hz) = ertc_clk(lick) / (ertc_clk_div_a + 1) * (ertc_clk_div_b + 1) */

 ertc_clk_div_b = 999;

 ertc_clk_div_a = 32;

#elif defined (ERTC_CLOCK_SOURCE_LEXT)

 /* enable the lext osc */

 crm_clock_source_enable(CRM_CLOCK_SOURCE_LEXT, TRUE);

 /* wait till lext is ready */

 while(crm_flag_get(CRM_LEXT_STABLE_FLAG) == RESET)

 {

 }

 /* select the ertc clock source */

 crm_ertc_clock_select(CRM_ERTC_CLOCK_LEXT);

 /* ertc second(1hz) = ertc_clk / (ertc_clk_div_a + 1) * (ertc_clk_div_b + 1) */

 ertc_clk_div_b = 999;

 ertc_clk_div_a = 32;

#endif

 /* enable the ertc clock */

 crm_ertc_clock_enable(TRUE);

 /* deinitializes the ertc registers */

 ertc_reset();

 /* wait for ertc registers update */

 ertc_wait_update();

 

 /* configure the ertc divider */

 ertc_divider_set(ertc_clk_div_a, ertc_clk_div_b);

 

 /* configure the ertc hour mode */

 ertc_hour_mode_set(ERTC_HOUR_MODE_24);

 

 /* set date: 2021-05-01 */

 ertc_date_set(21, 5, 1, 5);

 

 /* set time: 12:00:00 */

 ertc_time_set(12, 0, 0, ERTC_AM); 

 /* indicator for the ertc configuration */

 ertc_bpr_data_write(ERTC_DT1, 0x1234);

}