By Sky.J 2018.06.23
概述：
在使用STM32的过程中，我们在项目中可能经常会用到它的闹钟功能，但是对于刚开始接触STM32闹钟时，我就是直接设置一个闹钟，然后等待中断，有时候如果有两个闹钟，我们可以用ALARM A和B,但是有4个5个或者更多的闹钟设置，这时就不知道怎么办了。我就根据我的使用需求想了一个办法（只涉及几点几分，不考虑年月日及周几），如果你也有这样的需求，可以直接使用，如果不是，也希望可以给你留下一个思考的方向。
思路：
因为我的需求是每天的几点几分有一个闹钟，然后去处理，所以我的思路也很简单，就是将所有闹钟都注册到一个数组里面，然后换算为分钟从小到大进行排序，再根据当前时间去选择我下一个要设置的闹钟是哪一个，比如我已经注册了3个闹钟，时间分别是：200 300 500，当前时间是360，那么我现在选择设置的闹钟肯定是500。所以每次我们当闹钟响了以后，再去用当前时间和数组里面的闹钟时间对比，我们就可以得到下个闹钟需要设定的时间，是不是解决了闹钟设定的问题了呢。当然，有人会说闹钟设定了，我不知道这个闹钟响的时候我需要处理啥事件，很简单，我们在注册闹钟时不仅只注册时间，同时还需要注册闹钟事件标志。比如下方结构体：
typedef enum {
PRINT_PEACE = 0,
PRINT_LOVE,
PRINT_HAVE_FUN
}alarm_process_status_t;
typedef struct {
uint32_t time; //闹钟时间
alarm_process_status_t process_status; //闹钟事件
}alarm_info_t;
Linux下的模拟代码
这里我写了一个测试代码,为了方便调试和个人习惯，我自己是在linux下写了一个C代码，闹钟响不响，无非是中断是不是产生，至于怎么设置闹钟，这些我觉得你如果需要设置多个闹钟时，你一定已经基本知道闹钟的设置，我这里就不用STM32的实例代码了，我这边都是模拟，但效果是一样的，理解了思路就可以拿去增删改后用了。
typedef enum {
PRINT_PEACE = 0,
PRINT_LOVE,
PRINT_HAVE_FUN
}alarm_process_status_t;
typedef enum {
ALARM_NOSET = 0,
ALARM_SET
}alarm_set_status_t;
typedef struct {
uint32_t time;
alarm_process_status_t process_status;
}alarm_info_t;
typedef struct {
uint8_t size; //闹钟注册个数
alarm_set_status_t set_status; //闹钟是否设置标志
alarm_process_status_t process_status; //当前设置的闹钟响后需要做的事件标志
alarm_info_t info[ALARM_SIZE]; //存储注册的闹钟
}alarm_ctrl_t;
alarm_ctrl_t alarmctrl;
/*获取当前时间分钟*/
uint32_t get_local_time()
{
time_t now;
struct tm *tm_now;
time(&now);
tm_now = localtime(&now);
uint32_t times = tm_now->tm_hour * 60 + tm_now->tm_min;
return times;
}
/*初始化*/
void alarm_ctrl_init(alarm_ctrl_t *alarm_ctrl)
{
alarm_ctrl->size = 0;
alarm_ctrl->set_status = ALARM_NOSET;
}
/*获取闹钟响铃状态 1响 0 不响*/
uint8_t get_alarm_clock()
{
//对于在STM32中，我们可以在处理中断的文件中定义一个全局变量，当产生中断事变量变为1，否则为0
//此处测试，故一直返回1
return 1;
}
/*数组数据展示*/
void display_alarm_info()
{
alarm_ctrl_t *alarm_ctrl = &alarmctrl;
uint8_t i;
printf("show alarm info: \r\n");
for (i = 0; i < alarm_ctrl->size; i++) {
printf(" %d ", alarm_ctrl->info[i].time);
}
printf("\r\n");
}
/*数组冒泡排序*/
void sort_alarm_info(alarm_info_t *info, uint8_t size)
{
uint8_t i, j;
for (i =0; i < size - 1; i++)
{
for (j = 0; j < size-1-i; j++) {
if (info[j].time > info[j+1].time) {
alarm_info_t temp = info[j];
info[j] = info[j+1];
info[j+1] = temp;
}
}
}
}
/*数组插入*/
void insert_alarm_info(alarm_ctrl_t *alarm_ctrl, alarm_info_t *alarm_info)
{
uint8_t i;
uint8_t size = alarm_ctrl->size;
if (size >= ALARM_SIZE) {
return;
}
//相同闹钟禁止插入
for (i = 0; i < size; i++) {
if (alarm_ctrl->info[i].time == alarm_info->time) {
printf("alarm time is exist, error\r\n");
return ;
}
}
//插入数组数据并通过时间从小到大排序
alarm_ctrl->info[size].process_status = alarm_info->process_status;
alarm_ctrl->info[size].time = alarm_info->time;
alarm_ctrl->size ++;
sort_alarm_info(alarm_ctrl->info, alarm_ctrl->size);
display_alarm_info();
}
/*数组删除*/
void delete_alarm_info(alarm_ctrl_t *alarm_ctrl, uint32_t time)
{
uint8_t i, j, point, flag = 0;
uint8_t size = alarm_ctrl->size;
//查找删除的时间点是否存在
for (i = 0; i < size; i++) {
if (alarm_ctrl->info[i].time == time) {
flag = 1;
point = i;
break;
}
}
if (flag) {
//删除的是末尾数据，size直接减一即可
if (point + 1 == size) {
alarm_ctrl->size --;
display_alarm_info();
return;
}
//删除的数据不止末尾数据，则需将删除的数据后面的数据全部前移一位
alarm_ctrl->size --;
for (i = point; i < size; i++) {
alarm_ctrl->info[i].time = alarm_ctrl->info[i+1].time;
alarm_ctrl->info[i].process_status = alarm_ctrl->info[i+1].process_status;
}
display_alarm_info();
}
}
/*获取要设置的闹钟信息*/
uint8_t get_willalarm_info(uint32_t current_time, alarm_info_t *alarm_info)
{
alarm_ctrl_t *alarm_ctrl = &alarmctrl;
uint8_t i, flag = 0;
if (0 == alarm_ctrl->size) {
return 1;
} else {
//由于我们的闹钟数组是从小到大顺序排列，通过我们当前的时间去和闹钟数组时间对比
//找到第一个比当前时间大的闹钟，我们设置即可，若未找到说明我们当前时间太大，那么我们选择数据开始的闹钟设置即可
//如 数组 10 20 50 当前时间为18，那下个闹钟设置即是20，当前时间80，那么下个闹钟就是10
for (i = 0; i < alarm_ctrl->size; i++) {
if (current_time < alarm_ctrl->info[i].time) {
flag = 1;
alarm_info->time = alarm_ctrl->info[i].time;
alarm_info->process_status = alarm_ctrl->info[i].process_status;
break;
}
}
if (0 == flag) {
alarm_info->time = alarm_ctrl->info[0].time;
alarm_info->process_status = alarm_ctrl->info[0].process_status;
}
}
return 0;
}
/*业务处理*/
void alarm_handle_service()
{
static int k = 0;
alarm_ctrl_t *alarm_ctrl = &alarmctrl;
printf("size = %d, setstatus = %d\r\n", alarm_ctrl->size, alarm_ctrl->set_status);
//判断rtc是否同步，在STM32中，内置一个rtc，但当我们完全断电，rtc时间清掉，我们需重新同步
uint8_t rtc_sync_status = 1;
if (!rtc_sync_status) {
return;
}
//判断是否有闹钟需要设置
if (0 == alarm_ctrl->size) {
printf("not have alarm need set.....\r\n");
return;
}
//判断闹钟是否设置
if (ALARM_NOSET == alarm_ctrl->set_status) {
//闹钟未设置
//获取当前时间，设置闹钟
uint32_t current_time;
//current_time = get_local_time();//由于测试，此处不获取，自己赋值
if (0 == k) {
current_time = 5;
} else if (1 == k) {
current_time = 88;
} else if (2 == k) {
current_time = 300;
} else {
current_time = 1000;
k = 0;
}
k ++;
alarm_info_t alarm_info;
uint8_t ret = get_willalarm_info(current_time, &alarm_info);
if (0 == ret) {
printf("set alarm %d\r\n", alarm_info.time);
alarm_ctrl->process_status = alarm_info.process_status;
alarm_ctrl->set_status = ALARM_SET;
}
} else {
if (0 == get_alarm_clock()) {
return;
}
//闹钟响，处理
printf("alarm is clock....\r\n");
switch (alarm_ctrl->process_status) {
case PRINT_PEACE: {
printf("Peace.........\r\n");
break;
}
case PRINT_LOVE: {
printf("Love.........\r\n");
break;
}
case PRINT_HAVE_FUN: {
printf("Have Fun.........\r\n");
break;
}
default: {
break;
}
}
alarm_ctrl->set_status = ALARM_NOSET;
}
}
int main()
{
alarm_ctrl_init(&alarmctrl);
alarm_info_t alarm_info;
alarm_info.time = 100;
alarm_info.process_status = PRINT_LOVE;
insert_alarm_info(&alarmctrl, &alarm_info);
alarm_info.time = 10;
alarm_info.process_status = PRINT_PEACE;
insert_alarm_info(&alarmctrl, &alarm_info);
alarm_info.time = 500;
alarm_info.process_status = PRINT_HAVE_FUN;
insert_alarm_info(&alarmctrl, &alarm_info);
alarm_info.time = 1000;
alarm_info.process_status = PRINT_HAVE_FUN;
insert_alarm_info(&alarmctrl, &alarm_info);
delete_alarm_info(&alarmctrl, 1000);
while (1) {
alarm_handle_service();
sleep(10);
}
return 0;
}
代码输出结果
这里是代码运行后的部分结果如下：
sky@ubuntu:~$ ./alarm_test
show alarm info:
100
show alarm info:
10 100
show alarm info:
10 100 500
show alarm info:
10 100 500 1000
show alarm info:
10 100 500
size = 3, setstatus = 0
set alarm 10
size = 3, setstatus = 1
alarm is clock....
Peace.........
size = 3, setstatus = 0
set alarm 100
size = 3, setstatus = 1
alarm is clock....
Love.........
size = 3, setstatus = 0
set alarm 500
size = 3, setstatus = 1
alarm is clock....
Have Fun.........
size = 3, setstatus = 0
set alarm 10
size = 3, setstatus = 1
alarm is clock....
Peace.........
size = 3, setstatus = 0
set alarm 100