TaskHandle_t ReadHandle;
uint8_t value =0;
uint8_t limit_speed = 160;

void read_task(void *ptr){
TickType_t xLastWakeTime = xTaskGetTickCount();
while (1)
  {
    vTaskDelayUntil(&xLastWakeTime,1000);
     uint8_t speed_kmph = (*(uint8_t *)ptr * limit_speed) / 255L;  
	  Serial.print("当前时速(KM/H):");
    Serial.print(speed_kmph);
  	if(speed_kmph != 0)
		{
		uint8_t speed_mps=speed_kmph*5/18; //kmph->mps
		Serial.print("  KMPH转换成MPS：");
    Serial.print(speed_mps);
    float railjoint_Time = 25/(float)speed_mps;
    Serial.print("  轨间通过时间：");
    Serial.println(railjoint_Time,5);
    }
  }
}
void set_task(void * ptr){
pinMode(2, INPUT);
while(1){
  value=map(analogRead(2),0,4096,0,256);
  vTaskDelay(100);
}
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  xTaskCreate(set_task,"GIVE",1024,NULL,1,NULL);
  xTaskCreate(read_task,"SHOW",1024,(void*)&value,1,&ReadHandle);
  // Serial.println("Hello, ESP32!");



}

void loop() {
  //  vTaskDelay(2000);
  // int waterMark = uxTaskGetStackHighWaterMark(ReadHandle);
  // Serial.print("Task Free Memory: ");
  // Serial.print(waterMark);
  // Serial.println(" Bytes");
  // Serial.print("Task Used Memory: ");
  // Serial.print(1024 - waterMark);
  // Serial.println(" Bytes");
}