Source code for the Trusted Boot Module.
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tbm-mcu/source/platform/stm32f1/alarm.c

56 lines
1019 B

#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/exti.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rtc.h>
#include <rtc.h>
static int reset = 0;
void rtc_alarm_isr(void)
{
if (rtc_check_flag(RTC_ALR)) {
rtc_clear_flag(RTC_ALR);
rtc_disable_alarm();
exti_reset_request(EXTI17);
if (!reset) {
reset = 1;
gpio_set(GPIOA, GPIO1);
rtc_set_alarm_time(rtc_get_counter_val() + 5);
rtc_enable_alarm();
} else {
reset = 0;
gpio_set(GPIOA, GPIO1);
alarm_disable();
}
}
}
int alarm_enable(uint32_t timeout)
{
rtc_enable_alarm();
rtc_set_alarm_time(rtc_get_counter_val() + timeout);
exti_enable_request(EXTI17);
exti_set_trigger(EXTI17, EXTI_TRIGGER_RISING);
nvic_enable_irq(NVIC_RTC_ALARM_IRQ);
nvic_set_priority(NVIC_RTC_ALARM_IRQ, 1);
rtc_interrupt_enable(RTC_ALR);
return 0;
}
int alarm_disable(void)
{
exti_disable_request(EXTI17);
nvic_disable_irq(NVIC_RTC_ALARM_IRQ);
rtc_interrupt_disable(RTC_ALR);
rtc_disable_alarm();
return 0;
}