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@1:fdb8ecdf954f, 2017-03-15 (annotated)
- Committer:
- CSTritt
- Date:
- Wed Mar 15 01:54:31 2017 +0000
- Revision:
- 1:fdb8ecdf954f
- Parent:
- 0:8d318218bac1
- Child:
- 2:f91fc3b8d8f7
Demonstrates serial communications and digital output. Initial version.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
mab5449 | 0:8d318218bac1 | 1 | #include "mbed.h" |
CSTritt | 1:fdb8ecdf954f | 2 | /* |
CSTritt | 1:fdb8ecdf954f | 3 | Serial2RGB main by C. S. Tritt, Last revised 3/14/17 (v. 1.0) |
CSTritt | 1:fdb8ecdf954f | 4 | Toggles RGB LED junctions in response to serial input. Uses "unbuffered" |
CSTritt | 1:fdb8ecdf954f | 5 | reads (Enter, CR/LF not required). |
CSTritt | 1:fdb8ecdf954f | 6 | */ |
CSTritt | 1:fdb8ecdf954f | 7 | DigitalOut RedLED(D9); // Physically same as Arduino Digital pin 9. |
CSTritt | 1:fdb8ecdf954f | 8 | DigitalOut GrnLED(D10); // Physically same as Arduino Digital pin 10. |
CSTritt | 1:fdb8ecdf954f | 9 | DigitalOut BluLED(D11); // Physically same as Arduino Digital pin 11. |
CSTritt | 1:fdb8ecdf954f | 10 | |
CSTritt | 1:fdb8ecdf954f | 11 | Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1. |
mab5449 | 0:8d318218bac1 | 12 | |
mab5449 | 0:8d318218bac1 | 13 | int main() { |
CSTritt | 1:fdb8ecdf954f | 14 | |
CSTritt | 1:fdb8ecdf954f | 15 | RedLED = 0; |
CSTritt | 1:fdb8ecdf954f | 16 | GrnLED = 0; |
CSTritt | 1:fdb8ecdf954f | 17 | BluLED = 0; |
CSTritt | 1:fdb8ecdf954f | 18 | char letter; |
CSTritt | 1:fdb8ecdf954f | 19 | |
mab5449 | 0:8d318218bac1 | 20 | while(1) { |
CSTritt | 1:fdb8ecdf954f | 21 | if (pc.readable()) { |
CSTritt | 1:fdb8ecdf954f | 22 | letter = pc.getc(); |
CSTritt | 1:fdb8ecdf954f | 23 | pc.putc(letter); |
CSTritt | 1:fdb8ecdf954f | 24 | if (letter == 'r') { |
CSTritt | 1:fdb8ecdf954f | 25 | RedLED = !RedLED; |
CSTritt | 1:fdb8ecdf954f | 26 | } |
CSTritt | 1:fdb8ecdf954f | 27 | else if (letter == 'g') { |
CSTritt | 1:fdb8ecdf954f | 28 | GrnLED = !GrnLED; |
CSTritt | 1:fdb8ecdf954f | 29 | } |
CSTritt | 1:fdb8ecdf954f | 30 | else if (letter == 'b') { |
CSTritt | 1:fdb8ecdf954f | 31 | BluLED = !BluLED; |
CSTritt | 1:fdb8ecdf954f | 32 | } |
mab5449 | 0:8d318218bac1 | 33 | } |
mab5449 | 0:8d318218bac1 | 34 | } |
mab5449 | 0:8d318218bac1 | 35 | } |