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
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
- define RED_PIN 9 RED_LED
- define GRN_PIN 10 GREEN_LED
- define BLU_PIN 11 BLUE_LED
- 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); } } }
main.cpp
- Committer:
- CSTritt
- Date:
- 2017-03-15
- Revision:
- 1:fdb8ecdf954f
- Parent:
- 0:8d318218bac1
- Child:
- 2:f91fc3b8d8f7
File content as of revision 1:fdb8ecdf954f:
#include "mbed.h" /* Serial2RGB main by C. S. Tritt, Last revised 3/14/17 (v. 1.0) Toggles RGB LED junctions in response to serial input. Uses "unbuffered" reads (Enter, CR/LF not required). */ DigitalOut RedLED(D9); // Physically same as Arduino Digital pin 9. DigitalOut GrnLED(D10); // Physically same as Arduino Digital pin 10. DigitalOut BluLED(D11); // Physically same as Arduino Digital pin 11. Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1. int main() { RedLED = 0; GrnLED = 0; BluLED = 0; char letter; while(1) { if (pc.readable()) { letter = pc.getc(); pc.putc(letter); if (letter == 'r') { RedLED = !RedLED; } else if (letter == 'g') { GrnLED = !GrnLED; } else if (letter == 'b') { BluLED = !BluLED; } } } }