使用STM32l031xx的RTC定时器来计时30分钟,同时在接收到串口数据时通过一个标志位来记录有数据的情况,如果无数据则延时十秒重启
时间: 2024-02-01 08:13:04 浏览: 24
可以使用以下代码实现:
```c
#include "stm32l0xx.h"
#define RTC_WAKEUP_COUNTER_VALUE 1800 // 30 minutes in seconds
#define DELAY_BEFORE_RESTART 10000 // 10 seconds in milliseconds
uint8_t flag_data_received = 0;
void Configure_RTC(void)
{
// Enable access to the RTC registers
RCC->APB1ENR |= RCC_APB1ENR_PWREN;
PWR->CR |= PWR_CR_DBP;
// Enable the LSE oscillator and wait for it to stabilize
RCC->BDCR |= RCC_BDCR_LSEON;
while (!(RCC->BDCR & RCC_BDCR_LSERDY));
// Configure the RTC clock source as LSE
RCC->BDCR |= RCC_BDCR_RTCSEL_0;
// Enable the RTC
RCC->BDCR |= RCC_BDCR_RTCEN;
// Wait for the RTC to synchronize
RTC->WPR = 0xCA;
RTC->WPR = 0x53;
RTC->ISR |= RTC_ISR_INIT;
while (!(RTC->ISR & RTC_ISR_INITF));
RTC->PRER = (127 << 16) | 255;
RTC->TR = 0;
RTC->DR = 0;
RTC->ISR &= ~RTC_ISR_INIT;
while (!(RTC->ISR & RTC_ISR_RSF));
RTC->WPR = 0xFF;
// Configure the RTC wakeup timer
RTC->WUTR = RTC_WAKEUP_COUNTER_VALUE - 1;
RTC->CR |= RTC_CR_WUTE | RTC_CR_WUTIE | RTC_CR_WUCKSEL_2;
EXTI->IMR |= EXTI_IMR_IM20;
NVIC_EnableIRQ(RTC_IRQn);
}
void RTC_IRQHandler(void)
{
if (RTC->ISR & RTC_ISR_WUTF) {
RTC->ISR &= ~RTC_ISR_WUTF;
if (flag_data_received) {
// Reset the flag and start the timer again
flag_data_received = 0;
RTC->WUTR = RTC_WAKEUP_COUNTER_VALUE - 1;
} else {
// Delay before restarting
for (volatile uint32_t i = 0; i < DELAY_BEFORE_RESTART; i++);
NVIC_SystemReset();
}
}
}
int main(void)
{
Configure_RTC();
while (1) {
// Wait for data to be received
if (/* check for data received */) {
flag_data_received = 1;
}
}
}
```
在上述代码中,我们首先定义了一个名为 `flag_data_received` 的标志位,用来表示是否有数据被接收。在 `Configure_RTC` 函数中,我们首先使能了对 RTC 寄存器的访问,然后启用了 LSE 晶振作为 RTC 的时钟源,并等待其稳定。接着我们配置了 RTC 的时钟分频器和 RTC 进行初始化,最后设置了 RTC 的唤醒定时器,使其每隔 30 分钟中断一次。在主循环中,我们等待串口接收到数据后将 `flag_data_received` 标志位置为 1。在 RTC 中断处理函数中,我们首先判断是否是唤醒定时器的中断,并清除其中断标志位。如果 `flag_data_received` 标志位为 1,说明在 30 分钟内有数据被接收到,我们将其重置为 0 并重新启动定时器。如果 `flag_data_received` 标志位为 0,说明在 30 分钟内没有数据被接收到,我们则延时 10 秒并重启设备。