Charles Tritt / Mbed OS Serial2RGB_21_v5

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main.cpp@7:a03687963ad4, 2021-09-18 (annotated)

Committer:
CSTritt
Date:
Sat Sep 18 01:45:02 2021 +0000
Revision:
7:a03687963ad4
Parent:
6:dcc4031025a6 
Minor comment changes.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
CSTritt 1:fdb8ecdf954f 1 /*
CSTritt 7:a03687963ad4 2 Serial2RGB main by C. S. Tritt, Last revised 9/15/21 (v. 1.3)
CSTritt 5:c849e3c4a5f0 3
CSTritt 5:c849e3c4a5f0 4 Toggles RGB LED junctions in response to serial input. Note input is case
CSTritt 5:c849e3c4a5f0 5 sensive and known "commands" are r (toggle red), g (toggle green) and b
CSTritt 5:c849e3c4a5f0 6 toggle blue). Input (including CR/LF is echoed.
CSTritt 2:f91fc3b8d8f7 7
CSTritt 6:dcc4031025a6 8 Mbed 5 or earlier (due to Serial, BufferedSerial changes).
CSTritt 6:dcc4031025a6 9
CSTritt 2:f91fc3b8d8f7 10 Suggested wiring...
CSTritt 5:c849e3c4a5f0 11
CSTritt 2:f91fc3b8d8f7 12 Common Anode LED (active low)
CSTritt 5:c849e3c4a5f0 13
CSTritt 5:c849e3c4a5f0 14 /-- 680 kΩ -- D13 (red)
CSTritt 5:c849e3c4a5f0 15 + 3.3 to 5.0 V ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 16 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 17
CSTritt 2:f91fc3b8d8f7 18 Common Cathode LED (active high)
CSTritt 5:c849e3c4a5f0 19
CSTritt 5:c849e3c4a5f0 20 /-- 680 Ω -- D13 (red)
CSTritt 5:c849e3c4a5f0 21 GND ----LED<--- 680 Ω -- D14 (green)
CSTritt 5:c849e3c4a5f0 22 \-- 1 kΩ -- D15 (blue)
CSTritt 5:c849e3c4a5f0 23
CSTritt 1:fdb8ecdf954f 24 */
CSTritt 5:c849e3c4a5f0 25
CSTritt 7:a03687963ad4 26 // Include mbed API/Library declarations.
CSTritt 7:a03687963ad4 27 #include "mbed.h"
CSTritt 7:a03687963ad4 28
CSTritt 7:a03687963ad4 29 // Construct resources (these are global).
CSTritt 5:c849e3c4a5f0 30
CSTritt 4:43ce9b92ae68 31 DigitalOut RedLED(D13); // Arduino Digital pin 13 on Nucleos.
CSTritt 4:43ce9b92ae68 32 DigitalOut GrnLED(D14); // Arduino Digital pin 14.
CSTritt 4:43ce9b92ae68 33 DigitalOut BluLED(D15); // Arduino Digital pin 15.
CSTritt 1:fdb8ecdf954f 34
CSTritt 1:fdb8ecdf954f 35 Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1.
mab5449 0:8d318218bac1 36
CSTritt 5:c849e3c4a5f0 37 int main()
CSTritt 5:c849e3c4a5f0 38 {
CSTritt 5:c849e3c4a5f0 39
CSTritt 7:a03687963ad4 40 RedLED = 0; // Set pins to known state. This may be the default.
CSTritt 1:fdb8ecdf954f 41 GrnLED = 0;
CSTritt 1:fdb8ecdf954f 42 BluLED = 0;
CSTritt 7:a03687963ad4 43 char letter; // Declare a local variable to hold recieved characters.
CSTritt 5:c849e3c4a5f0 44
CSTritt 5:c849e3c4a5f0 45 while(true) { // Main (infinite) loop.
CSTritt 5:c849e3c4a5f0 46 if (pc.readable()) { // Is there a character waiting? If so,
CSTritt 5:c849e3c4a5f0 47 letter = pc.getc(); // Get it.
CSTritt 7:a03687963ad4 48 pc.putc(letter); // Echo it to the terminal.
CSTritt 5:c849e3c4a5f0 49 if (letter == 'r') { // Respond to known letters, ignore others.
CSTritt 5:c849e3c4a5f0 50 RedLED = !RedLED; // Toggle red.
CSTritt 5:c849e3c4a5f0 51 } else if (letter == 'g') {
CSTritt 5:c849e3c4a5f0 52 GrnLED = !GrnLED; // Toggle green.
CSTritt 5:c849e3c4a5f0 53 } else if (letter == 'b') {
CSTritt 5:c849e3c4a5f0 54 BluLED = !BluLED; // Toggle blue.
CSTritt 1:fdb8ecdf954f 55 }
mab5449 0:8d318218bac1 56 }
mab5449 0:8d318218bac1 57 }
CSTritt 3:cbacf69dbed5 58 }