diff options
| -rw-r--r-- | chip/stm32/clock-stm32f4.c | 6 | ||||
| -rw-r--r-- | chip/stm32/config-stm32f4.h | 11 | ||||
| -rw-r--r-- | test/stm32f_rtc.c | 24 |
3 files changed, 35 insertions, 6 deletions
diff --git a/chip/stm32/clock-stm32f4.c b/chip/stm32/clock-stm32f4.c index 401c06be1c..b30edc1fa2 100644 --- a/chip/stm32/clock-stm32f4.c +++ b/chip/stm32/clock-stm32f4.c @@ -438,12 +438,6 @@ static int dsleep_recovery_margin_us = 1000000; #define STOP_MODE_LATENCY 50 /* us */ /* PLL_LOCK_LATENCY: delay to switch from HSI to PLL */ #define PLL_LOCK_LATENCY 150 /* us */ -/* - * SET_RTC_MATCH_DELAY: max time to set RTC match alarm. If we set the alarm - * in the past, it will never wake up and cause a watchdog. - */ -#define SET_RTC_MATCH_DELAY 120 /* us */ - void low_power_init(void) { diff --git a/chip/stm32/config-stm32f4.h b/chip/stm32/config-stm32f4.h index 46303444fc..ee1d594116 100644 --- a/chip/stm32/config-stm32f4.h +++ b/chip/stm32/config-stm32f4.h @@ -73,3 +73,14 @@ /* DFU Address */ #define STM32_DFU_BASE 0x1fff0000 + +/* + * SET_RTC_MATCH_DELAY: max time to set RTC match alarm. If we set the alarm + * in the past, it will never wake up and cause a watchdog. + * + * This value is minimal time for which we can set RTC match alarm. It was + * obtained by setting the alarm and checking if the alarm interrupt was + * triggered. Unit test test_rtc_match_delay is responsible for verifying if + * setting the RTC match alarm with this value will generate the interrupt. + */ +#define SET_RTC_MATCH_DELAY 200 /* us */ diff --git a/test/stm32f_rtc.c b/test/stm32f_rtc.c index 36c67f004e..b9b48ec043 100644 --- a/test/stm32f_rtc.c +++ b/test/stm32f_rtc.c @@ -53,11 +53,35 @@ test_static int test_rtc_alarm(void) return EC_SUCCESS; } +static const int rtc_match_delay_iterations = 5000; + +test_static int test_rtc_match_delay(void) +{ + struct rtc_time_reg rtc; + int i; + + atomic_clear(&rtc_fired); + for (i = 0; i < rtc_match_delay_iterations; i++) { + set_rtc_alarm(0, SET_RTC_MATCH_DELAY, &rtc, 0); + usleep(2 * SET_RTC_MATCH_DELAY); + } + + ccprintf("Expected number of RTC alarm interrupts %d\n", + rtc_match_delay_iterations); + ccprintf("Actual number of RTC alarm interrupts %d\n", rtc_fired); + + /* Make sure each set_rtc_alarm() generated the interrupt. */ + TEST_EQ(rtc_match_delay_iterations, atomic_clear(&rtc_fired), "%d"); + + return EC_SUCCESS; +} + void run_test(int argc, char **argv) { test_reset(); RUN_TEST(test_rtc_alarm); + RUN_TEST(test_rtc_match_delay); test_print_result(); } |