Merge pull request #175 from ShashaDDD/master

add LASER example

Author: ShashaDDD

examples/Unit/LASER/LASER_RXTX.ino

@@ -0,0 +1,84 @@
+
+/* This demo is for LASER.TX and LASER.RX, utilized UART for transmittion and reception of
+ laser signals. In order to get the result of this demo, you will need to connect LASER.TX 
+ and LASER.RX with PORTC(blue) respectively onto two different M5Cores with M5GO bases on
+  bottom. Then flash the demo into both M5Core device. 
+
+  When testing the demo, you need to point the TX unit to RX, and press the button TX connected 
+  device. RX connected device will reponse with a display,and will show what is received . 
+
+  See this link for more detals: https://m5stack.oss-cn-shenzhen.aliyuncs.com/EasyLoader/Unit/LASER/EasyLoader_LASER_RX.exe
+ */
+
+#include <M5Stack.h>
+
+char ch;
+// serial 2 write and read
+//#define RX 
+void setup() {
+
+  M5.begin();
+
+  Serial.begin(115200);
+
+  // Serial2.begin(unsigned long baud, uint32_t config, int8_t rxPin, int8_t txPin, bool invert)
+  Serial2.begin(9600, SERIAL_8N1, 16, 17);
+  pinMode(5, OUTPUT);
+  digitalWrite(5, 1);
+
+  M5.Lcd.setTextSize(4);
+  M5.Lcd.setTextColor(GREEN);
+  M5.Lcd.setCursor(60, 50);
+#ifdef RX
+  M5.Lcd.print("LASER RX");
+#elif defined TX
+  M5.Lcd.print("LASER TX");
+#else
+  M5.Lcd.setCursor(30, 50);
+  M5.Lcd.print("LASER TX/RX");
+  M5.Lcd.setCursor(50, 200);
+  M5.Lcd.print('A');
+  M5.Lcd.setCursor(150, 200);
+  M5.Lcd.print('B');
+  M5.Lcd.setCursor(240, 200);
+  M5.Lcd.print('C');
+#endif
+  M5.Lcd.setCursor(0, 100);
+}
+
+void loop() {
+
+#ifdef RX 
+M5.update();
+ if(Serial2.available()) {
+    char ch = Serial2.read();
+    M5.Lcd.print(ch);
+ }
+
+  if (M5.BtnA.wasReleased()) {
+    M5.Lcd.clear();
+    M5.Lcd.setCursor(0, 0);
+  }
+#elif defined TX
+    Serial2.write('A');
+    delay(50);
+#else
+  if (M5.BtnA.wasReleased()) {
+    ch = 'A';
+    Serial2.write(ch);
+  } else if (M5.BtnB.wasReleased()) {
+    ch = 'B';
+    Serial2.write(ch);
+  } else if (M5.BtnC.wasReleased()) {
+    ch = 'C';
+    Serial2.write(ch);
+  }
+  M5.update();
+ if(Serial2.available()) {
+    char ch = Serial2.read();
+    M5.Lcd.print(ch);
+ }
+#endif
+
+
+}