文章目錄

• 1 LED驅動流程圖分析
• • 1.1 led_on流程圖分析
  • 1.2 led_blink流程圖分析
• 2 代碼實現

1 LED驅動流程圖分析

這里主要分析led_on和led_blink流程。

1.1 led_on流程圖分析

1.2 led_blink流程圖分析

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2 代碼實現

代碼使用HAL庫開發，并且配置freertos。HAL配置太簡單了，沒啥需要注意的就不記錄了。

drv_led.h:

#ifndef __DRV_LED_H #define __DRV_LED_Hvoid led_init(void); void led_on(uint32_t time_sec); void led_off(void); void led_blink(uint32_t period,uint32_t time_sec);#endif

drv_led.c:

#include <stdbool.h> #include <string.h> #include "main.h"#include "FreeRTOS.h" #include "timers.h"#define LED_OFF() HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_SET) #define LED_ON() HAL_GPIO_WritePin(LED_GPIO_Port,LED_Pin,GPIO_PIN_RESET) #define LED_TOGGLE() HAL_GPIO_TogglePin(LED_GPIO_Port,LED_Pin)typedef enum{LED_STATE_OFF,LED_STATE_ON,LED_STATE_BLINK, }led_state_e;static bool is_inited=false; static TimerHandle_t timer_led; static uint8_t state;struct led_control_t {uint32_t time_on;uint32_t time_blink;uint32_t period_blink;uint32_t cnt_time_on;uint32_t cnt_time_blink;uint32_t cnt_period_blink; }ledctl;void led_timer_callback( TimerHandle_t xTimer ) {switch (state){case LED_STATE_ON:ledctl.cnt_time_on++;if(ledctl.cnt_time_on>=ledctl.time_on){LED_OFF();ledctl.cnt_time_on=0;xTimerStop(timer_led,1000);}break;case LED_STATE_BLINK:ledctl.cnt_time_blink++;ledctl.cnt_period_blink++;if(ledctl.cnt_time_blink>=ledctl.time_blink){LED_OFF();ledctl.cnt_time_blink=0;xTimerStop(timer_led,1000);break;}if(ledctl.cnt_period_blink>=ledctl.period_blink){ledctl.cnt_period_blink=0;LED_TOGGLE();}break;default:break;}}void led_init(void) {state=LED_STATE_OFF;memset(&ledctl,0,sizeof(ledctl));timer_led=xTimerCreate("timer_led",100,pdTRUE,NULL,led_timer_callback);LED_OFF();is_inited=true; } void led_on(uint32_t time_sec) {if(!is_inited)return ;xTimerStop(timer_led,1000);ledctl.time_on=time_sec*10;ledctl.cnt_time_on=0;LED_ON();state=LED_STATE_ON;xTimerStart(timer_led,1000); } void led_off(void) {if(!is_inited)return ;xTimerStop(timer_led,1000);LED_OFF();state=LED_STATE_OFF;ledctl.cnt_time_on=0;ledctl.cnt_time_blink=0;ledctl.cnt_period_blink=0; } void led_blink(uint32_t period,uint32_t time_sec) {if(!is_inited)return ;xTimerStop(timer_led,1000);ledctl.time_blink=time_sec*10;ledctl.period_blink=period;ledctl.cnt_time_blink=0;ledctl.cnt_period_blink=0;LED_ON();state=LED_STATE_BLINK;xTimerStart(timer_led,1000); }

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