Charles Tritt / Mbed OS Serial2RGB_N

This program demonstrates serial communications and digital output. I have a similar program for the Arduino Uno. The purpose of this program is to compare mbed and Arduino code.

Fork of Serial_ex_2 by mbed_example

This is the corresponding Arduino/Wiring .ino program:

/* Serial2RGB_A

Toggles RGB LED junctions based on characters received via serial connection. Echos characters sent.

Hardware Required:

Arduino (or similar board as written)

Created by Dr. C. S. Tritt

Revision History

16-07-07 v. 1.0 Initial development (on TI MSP432). 17-03-13 v. 1.1 Ported to Arduino boards. 17-03-14 v. 1.2 Added echo of read characters.

  • /

Use defines for pin IDs and other constants

  1. define RED_PIN 9 RED_LED
  2. define GRN_PIN 10 GREEN_LED
  3. define BLU_PIN 11 BLUE_LED
  4. define BAUD 9600 Other settings default to 8-N-1.

char inChar; boolean redState = LOW; boolean grnState = LOW; boolean bluState = LOW;

void setup() { Initialize the pins as an output. Assumes adjacent pins. for (int led = RED_PIN; led <= BLU_PIN; led++) { pinMode(led, OUTPUT); } Initialize serial communication. Serial.begin(BAUD); Set baud rate. }

void loop() { Read serial if available. if (Serial.available() > 0) { get incoming byte: inChar = (char) Serial.read(); Read and convert a value. Serial.print(inChar); Echo what was read. Use it to toggle outputs (LED states) if (inChar == 'r') { redState = !redState; digitalWrite(RED_PIN, redState); } else if (inChar == 'g') { grnState = !grnState; digitalWrite(GRN_PIN, grnState); } else if (inChar == 'b') { bluState = !bluState; digitalWrite(BLU_PIN, bluState); } } }

Files at this revision

API Documentation at this revision

Revision 3:cbacf69dbed5, committed 2017-03-18

Comitter:
CSTritt
Date:
Sat Mar 18 10:02:26 2017 +0000
Parent:
2:f91fc3b8d8f7
Commit message:
Cleaned up comments. Switched from 1 to true constant in while loop.

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r f91fc3b8d8f7 -r cbacf69dbed5 main.cpp
--- a/main.cpp	Wed Mar 15 02:24:10 2017 +0000
+++ b/main.cpp	Sat Mar 18 10:02:26 2017 +0000
@@ -1,8 +1,8 @@
 #include "mbed.h"
 /*
-    Serial2RGB main by C. S. Tritt, Last revised 3/14/17 (v. 1.0)
+    Serial2RGB main by C. S. Tritt, Last revised 3/18/17 (v. 1.1)
     
-    Toggles RGB LED junctions in response to serial input.
+    Toggles RGB LED junctions in response to serial input. Echos input.
     
     Suggested wiring...
     
@@ -19,7 +19,7 @@
                 \-- 680 Ω -- D11 (blue)
    
 */
-DigitalOut RedLED(D9); // Physically same as Arduino Digital pin 9.
+DigitalOut RedLED(D9); // Physically same as Arduino Digital pin 9 on Nucleos.
 DigitalOut GrnLED(D10); // Physically same as Arduino Digital pin 10.
 DigitalOut BluLED(D11); // Physically same as Arduino Digital pin 11.
 
@@ -32,7 +32,7 @@
     BluLED = 0;
     char letter;
     
-    while(1) {
+    while(true) {
         if (pc.readable()) {
             letter = pc.getc();
             pc.putc(letter);
@@ -47,4 +47,4 @@
             }       
         }
     }
-}
+}
\ No newline at end of file