1. 配置rtc，设置成秒中断，2秒闪烁一次；
- void RTC_IRQhandler(void)//RTC中断函数
- {
- RTC_MtiMECMP->mtimecmp += 1000000;
- s_time_cnt++;
- GPIO_Toggle(GPIOA,PIN12);
- }
- void RTC_Init_case1(void)
- {
- uint32_t mask=0x1f<<10;
- uint32_t temp = CMU->CLK_DIV;
- temp &= ~mask;
- temp |= 31<<10;
- CMU->CLK_DIV = temp;
- RTC_MTIME->mtime = 0;
- RTC_MTIMECMP->mtimecmp = 1000000;
- }
2. 配置rtc主函数，同时借用了risc-v编译器中的time库来将秒中断计数值转换为日历。
- #include "headfile.h"
- #include
- int main(void)
- {
- ///----System Init ---------------------------------------------------------------------------------------------
- CLIC_Init();//系统中断配置
- System_Clock_Init();//系统时钟初始化
- RTC_Init_case1();
- Interrupt_Level(MTIMER_int_ID, INT_LEVEL2 );//CLIC设置中断抢占级别
- Interrupt_Enable(MTIMER_int_ID);//CLIC使能中断
- SYS_Interrupt_Enable();//CLIC开总中断
- UART_Init_case1(UART1);//非中断模式
- time_t raw_time;
- struct tm *timeinfo;
- time(&raw_time);
- timeinfo = localtime(&raw_time);
- timeinfo->tm_year= 2022 - 1900;
- timeinfo->tm_mon = 5 -1;
- timeinfo->tm_mday = 26;
- timeinfo->tm_hour = 20;
- timeinfo->tm_min = 15;
- timeinfo->tm_sec = 15;
- raw_time = mktime(timeinfo);
- time_t last_time = s_time_cnt;
- char buffer[80];
- while(1)
- {
- Delay32M_ms(1000);
- raw_time += (s_time_cnt -last_time);
- last_time = s_time_cnt;
- timeinfo = localtime(&raw_time);
- raw_time = mktime(timeinfo);
- strftime(buffer, sizeof(buffer), "%c", timeinfo );
- printf(buffer);
- printf("n")
- }
- }
3. Makefile沿用前面的，同时注意
- void RTC_IRQhandler(void) __attribute__((interrupt("SiFive-CLIC-preemptible")));
在linux编辑中更改为
- void RTC_IRQhandler(void) __attribute__((interrupt()));
4. 效果展示
