Charles Tritt / Mbed OS Serial2RGB_21_v5

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main.cpp@5:c849e3c4a5f0, 2017-09-12 (annotated)

Committer:
CSTritt
Date:
Tue Sep 12 13:21:53 2017 +0000
Revision:
5:c849e3c4a5f0
Parent:
4:43ce9b92ae68
Child:
6:dcc4031025a6
Added more comments. Reworded some.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mab5449 0:8d318218bac1 1 #include "mbed.h"
CSTritt 1:fdb8ecdf954f 2 /*
CSTritt 5:c849e3c4a5f0 3 Serial2RGB main by C. S. Tritt, Last revised 9/12/17 (v. 1.2)
CSTritt 5:c849e3c4a5f0 4
CSTritt 5:c849e3c4a5f0 5 Toggles RGB LED junctions in response to serial input. Note input is case
CSTritt 5:c849e3c4a5f0 6 sensive and known "commands" are r (toggle red), g (toggle green) and b
CSTritt 5:c849e3c4a5f0 7 toggle blue). Input (including CR/LF is echoed.
CSTritt 2:f91fc3b8d8f7 8
CSTritt 2:f91fc3b8d8f7 9 Suggested wiring...
CSTritt 5:c849e3c4a5f0 10
CSTritt 2:f91fc3b8d8f7 11 Common Anode LED (active low)
CSTritt 5:c849e3c4a5f0 12
CSTritt 5:c849e3c4a5f0 13 /-- 680 kΩ -- D13 (red)
CSTritt 5:c849e3c4a5f0 14 + 3.3 to 5.0 V ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 15 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 16
CSTritt 2:f91fc3b8d8f7 17 Common Cathode LED (active high)
CSTritt 5:c849e3c4a5f0 18
CSTritt 5:c849e3c4a5f0 19 /-- 680 Ω -- D13 (red)
CSTritt 5:c849e3c4a5f0 20 GND ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 21 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 22
CSTritt 1:fdb8ecdf954f 23 */
CSTritt 5:c849e3c4a5f0 24
CSTritt 5:c849e3c4a5f0 25 // Construct resources.
CSTritt 5:c849e3c4a5f0 26
CSTritt 4:43ce9b92ae68 27 DigitalOut RedLED(D13); // Arduino Digital pin 13 on Nucleos.
CSTritt 4:43ce9b92ae68 28 DigitalOut GrnLED(D14); // Arduino Digital pin 14.
CSTritt 4:43ce9b92ae68 29 DigitalOut BluLED(D15); // Arduino Digital pin 15.
CSTritt 1:fdb8ecdf954f 30
CSTritt 1:fdb8ecdf954f 31 Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1.
mab5449 0:8d318218bac1 32
CSTritt 5:c849e3c4a5f0 33 int main()
CSTritt 5:c849e3c4a5f0 34 {
CSTritt 5:c849e3c4a5f0 35
CSTritt 5:c849e3c4a5f0 36 RedLED = 0; // Set pins to known state (junction on if active low).
CSTritt 1:fdb8ecdf954f 37 GrnLED = 0;
CSTritt 1:fdb8ecdf954f 38 BluLED = 0;
CSTritt 5:c849e3c4a5f0 39 char letter; // Declare variable to hold recieved characters.
CSTritt 5:c849e3c4a5f0 40
CSTritt 5:c849e3c4a5f0 41 while(true) { // Main (infinite) loop.
CSTritt 5:c849e3c4a5f0 42 if (pc.readable()) { // Is there a character waiting? If so,
CSTritt 5:c849e3c4a5f0 43 letter = pc.getc(); // Get it.
CSTritt 5:c849e3c4a5f0 44 pc.putc(letter); // Echo it.
CSTritt 5:c849e3c4a5f0 45 if (letter == 'r') { // Respond to known letters, ignore others.
CSTritt 5:c849e3c4a5f0 46 RedLED = !RedLED; // Toggle red.
CSTritt 5:c849e3c4a5f0 47 } else if (letter == 'g') {
CSTritt 5:c849e3c4a5f0 48 GrnLED = !GrnLED; // Toggle green.
CSTritt 5:c849e3c4a5f0 49 } else if (letter == 'b') {
CSTritt 5:c849e3c4a5f0 50 BluLED = !BluLED; // Toggle blue.
CSTritt 1:fdb8ecdf954f 51 }
mab5449 0:8d318218bac1 52 }
mab5449 0:8d318218bac1 53 }
CSTritt 3:cbacf69dbed5 54 }