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感知节点@5@ ESP32+arduino+ 第三个程序FreeRTOS 上 LED灯显示和串口打印ASCII表

news 2025/10/15 20:25:26

思路：

将 LED灯显示作为一个独立的 FreeROTS 任务
将串口打印ASCII表作为一个独立的 FreeROTS任务

将已经调试好的 LED灯显示代码和串口打印ASCII表可以复制使用。

1）观看视频，理解FreeROTS 多任务运行，复制程序实例

第二课：

https://www.bilibili.com/video/BV1RB4y1Q7be/?spm_id_from=333.1387.collection.video_card.click&vd_source=25818e6e97754951f67187083c89af5a

仿真链接：

第二课：程序实例： https://wokwi.com/projects/332576245745189459

2）复制程序实例，并修改初始化和任务函数，实现LED灯显示任务和串口打印ASCII表任务

/*程序： FREERTOS - 多任务点灯程序实例作业： 添加LED3公众号：孤独的二进制
*/
//查看电路图，那个ESP32的引脚连接LED灯  图中看到是IO2
#define LED_BUILTIN 2  void task1(void *pt) {//pinMode(23, OUTPUT);// initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);while (1) {//digitalWrite(23, !digitalRead(23));/*Tick to TimepdMS_TO_TICKSportTICK_PERIOD_MSvTaskDelay(pdMS_TO_TICKS(1000));vTaskDelay(1000/portTICK_PERIOD_MS);*///vTaskDelay(1000); //注意 是 ticks的数量 不是时间
digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)vTaskDelay(1000);//delay(1000);                      // wait for a seconddigitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOWvTaskDelay(1000);//delay(1000);                      // wait for a second
  }
}// first visible ASCIIcharacter '!' is number 33:
int thisByte = 33;
void task2(void *pt) {//pinMode(21, OUTPUT);//Initialize serial and wait for port to open:Serial.begin(9600);while (!Serial) {;  // wait for serial port to connect. Needed for native USB port only
  }// prints title with ending line breakSerial.println("ASCII Table ~ Character Map");while (1) {// digitalWrite(21, !digitalRead(21));// vTaskDelay(3000);// prints value unaltered, i.e. the raw binary version of the byte.// The Serial Monitor interprets all bytes as ASCII, so 33, the first number,// will show up as '!'
  Serial.write(thisByte);Serial.print(", dec: ");// prints value as string as an ASCII-encoded decimal (base 10).// Decimal is the default format for Serial.print() and Serial.println(),// so no modifier is needed:
  Serial.print(thisByte);// But you can declare the modifier for decimal if you want to.// this also works if you uncomment it:// Serial.print(thisByte, DEC);Serial.print(", hex: ");// prints value as string in hexadecimal (base 16):
  Serial.print(thisByte, HEX);Serial.print(", oct: ");// prints value as string in octal (base 8);
  Serial.print(thisByte, OCT);Serial.print(", bin: ");// prints value as string in binary (base 2) also prints ending line break:
  Serial.println(thisByte, BIN);// if printed last visible character '~' or 126, stop:if (thisByte == 126) {  // you could also use if (thisByte == '~') {// This loop loops forever and does nothingwhile (true) {continue;}}// go on to the next characterthisByte++;}
}void setup() {// Serial.begin(9600);// Serial.print("ESP32 Tick Period - ");// Serial.print(portTICK_PERIOD_MS);// Serial.println("ms");if (xTaskCreate(task1,"Blink",1024,NULL,1,NULL) == pdPASS)Serial.println("Task1 Created.");if (xTaskCreate(task2,"ASCII_table",1024,NULL,1,NULL) == pdPASS)Serial.println("Task2 Created.");}void loop() {
}