我要講的提高代碼效率的方法很簡單，不涉及底層。簡單講就是程序非阻塞。
何為阻塞？阻塞就是程序停在那里一動不動，比如又或者使用for循環做的延時- void delay(int time)
- {
- int i=0;
- for(i=0;i<time;i++);
- }
- void DelayTimeCount_ms(uint16_t *DelayTime_Count)
- {
- if(*DelayTime_Count==0)
- {
- *DelayTime_Count=0;
- }
- else
- {
- *DelayTime_Count-=1;
- }
- }
- void Set_Delay_Time(uint16_t Time,uint16_t *DelayTime_Count)
- {
- *DelayTime_Count=Time;
- }
- uint8_t CheckDelay(uint16_t *DelayTime_Count)
- {
- if(*DelayTime_Count==0)
- {
- return 0;
- }
- else
- {
- return 1;
- }
- }
接下來寫一個LED閃爍函數并把其放在大循環調用
- void LED_Twinkle(uint16_t HarfPeriod)
- {
- static uint8_t Status=0;
- switch(Status)
- {
- case 0:
- {
- LED(ON);
- Set_Delay_Time(HarfPeriod,&DelayTime_LED);
- Status++；
- }break;
- case 1:
- {
- if(CheckDelay(&DelayTime_LED) == 0)
- {
- Status++；
- }
- }break;
- case 2:
- {
- LED(OFF);
- Set_Delay_Time(HarfPeriod,&DelayTime_LED);
- Status++；
- }break;
- case 3:
- {
- if(CheckDelay(&DelayTime_LED) == 0)
- {
- Status = 0；
- }
- }break;
- }
- }
- DelayTimeCount_ms(&DelayTime_LED);
這玩意沒啥技術含量無非就是多寫幾行代碼。如果有興趣的話可以看看我發的矩陣鍵盤驅動和modbus主機驅動里邊有更詳細的應用。
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