Charles Tritt / Mbed OS Serial2RGB_21_v5

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main.cpp@6:dcc4031025a6, 2021-09-17 (annotated)

Committer:
CSTritt
Date:
Fri Sep 17 20:47:58 2021 +0000
Revision:
6:dcc4031025a6
Parent:
5:c849e3c4a5f0
Child:
7:a03687963ad4
Mbed v5 for 2021 week 2 lab.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mab5449 0:8d318218bac1 1 #include "mbed.h"
CSTritt 6:dcc4031025a6 2
CSTritt 1:fdb8ecdf954f 3 /*
CSTritt 6:dcc4031025a6 4 Serial2RGB main by C. S. Tritt, Last revised 9/15/21 (v. 1.2)
CSTritt 5:c849e3c4a5f0 5
CSTritt 5:c849e3c4a5f0 6 Toggles RGB LED junctions in response to serial input. Note input is case
CSTritt 5:c849e3c4a5f0 7 sensive and known "commands" are r (toggle red), g (toggle green) and b
CSTritt 5:c849e3c4a5f0 8 toggle blue). Input (including CR/LF is echoed.
CSTritt 2:f91fc3b8d8f7 9
CSTritt 6:dcc4031025a6 10 Mbed 5 or earlier (due to Serial, BufferedSerial changes).
CSTritt 6:dcc4031025a6 11
CSTritt 2:f91fc3b8d8f7 12 Suggested wiring...
CSTritt 5:c849e3c4a5f0 13
CSTritt 2:f91fc3b8d8f7 14 Common Anode LED (active low)
CSTritt 5:c849e3c4a5f0 15
CSTritt 5:c849e3c4a5f0 16 /-- 680 kΩ -- D13 (red)
CSTritt 5:c849e3c4a5f0 17 + 3.3 to 5.0 V ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 18 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 19
CSTritt 2:f91fc3b8d8f7 20 Common Cathode LED (active high)
CSTritt 5:c849e3c4a5f0 21
CSTritt 5:c849e3c4a5f0 22 /-- 680 Ω -- D13 (red)
CSTritt 5:c849e3c4a5f0 23 GND ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 24 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 25
CSTritt 1:fdb8ecdf954f 26 */
CSTritt 5:c849e3c4a5f0 27
CSTritt 5:c849e3c4a5f0 28 // Construct resources.
CSTritt 5:c849e3c4a5f0 29
CSTritt 4:43ce9b92ae68 30 DigitalOut RedLED(D13); // Arduino Digital pin 13 on Nucleos.
CSTritt 4:43ce9b92ae68 31 DigitalOut GrnLED(D14); // Arduino Digital pin 14.
CSTritt 4:43ce9b92ae68 32 DigitalOut BluLED(D15); // Arduino Digital pin 15.
CSTritt 1:fdb8ecdf954f 33
CSTritt 1:fdb8ecdf954f 34 Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1.
mab5449 0:8d318218bac1 35
CSTritt 5:c849e3c4a5f0 36 int main()
CSTritt 5:c849e3c4a5f0 37 {
CSTritt 5:c849e3c4a5f0 38
CSTritt 5:c849e3c4a5f0 39 RedLED = 0; // Set pins to known state (junction on if active low).
CSTritt 1:fdb8ecdf954f 40 GrnLED = 0;
CSTritt 1:fdb8ecdf954f 41 BluLED = 0;
CSTritt 5:c849e3c4a5f0 42 char letter; // Declare variable to hold recieved characters.
CSTritt 5:c849e3c4a5f0 43
CSTritt 5:c849e3c4a5f0 44 while(true) { // Main (infinite) loop.
CSTritt 5:c849e3c4a5f0 45 if (pc.readable()) { // Is there a character waiting? If so,
CSTritt 5:c849e3c4a5f0 46 letter = pc.getc(); // Get it.
CSTritt 5:c849e3c4a5f0 47 pc.putc(letter); // Echo it.
CSTritt 5:c849e3c4a5f0 48 if (letter == 'r') { // Respond to known letters, ignore others.
CSTritt 5:c849e3c4a5f0 49 RedLED = !RedLED; // Toggle red.
CSTritt 5:c849e3c4a5f0 50 } else if (letter == 'g') {
CSTritt 5:c849e3c4a5f0 51 GrnLED = !GrnLED; // Toggle green.
CSTritt 5:c849e3c4a5f0 52 } else if (letter == 'b') {
CSTritt 5:c849e3c4a5f0 53 BluLED = !BluLED; // Toggle blue.
CSTritt 1:fdb8ecdf954f 54 }
mab5449 0:8d318218bac1 55 }
mab5449 0:8d318218bac1 56 }
CSTritt 3:cbacf69dbed5 57 }