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.
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main.cpp
00001 #include "mbed.h" 00002 /* 00003 Serial2RGB main by C. S. Tritt, Last revised 3/18/17 (v. 1.1) 00004 00005 Toggles RGB LED junctions in response to serial input. Echos input. 00006 00007 Suggested wiring... 00008 00009 Common Anode LED (active low) 00010 00011 /-- 1 kΩ -- D9 (red) 00012 + 3.3 to 5.0 V ----LED<--- 680 Ω -- D10 (green) 00013 \-- 680 Ω -- D11 (blue) 00014 00015 Common Cathode LED (active high) 00016 00017 /-- 1 kΩ -- D9 (red) 00018 GND ----LED<--- 680 Ω -- D10 (green) 00019 \-- 680 Ω -- D11 (blue) 00020 00021 */ 00022 DigitalOut RedLED(D9); // Physically same as Arduino Digital pin 9 on Nucleos. 00023 DigitalOut GrnLED(D10); // Physically same as Arduino Digital pin 10. 00024 DigitalOut BluLED(D11); // Physically same as Arduino Digital pin 11. 00025 00026 Serial pc(USBTX, USBRX); // Default settings are 9600 Baud, 8-N-1. 00027 00028 int main() { 00029 00030 RedLED = 0; 00031 GrnLED = 0; 00032 BluLED = 0; 00033 char letter; 00034 00035 while(true) { 00036 if (pc.readable()) { 00037 letter = pc.getc(); 00038 pc.putc(letter); 00039 if (letter == 'r') { 00040 RedLED = !RedLED; 00041 } 00042 else if (letter == 'g') { 00043 GrnLED = !GrnLED; 00044 } 00045 else if (letter == 'b') { 00046 BluLED = !BluLED; 00047 } 00048 } 00049 } 00050 }
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