Multi-Hackers / Mbed 2 deprecated Nucleo_hello_world

Prints "Hello World!" every 5 seconds, and blinks LED1 at a defined hertz.

Dependencies:   mbed

main.cpp@0:543eb4b01cda, 2014-10-14 (annotated)

Committer:
Vanger
Date:
Tue Oct 14 18:07:09 2014 +0000
Revision:
0:543eb4b01cda
Child:
1:f09b0fb6022a
Created hello world program (Nucleo_blink_led) to demonstrate how to compile and run some test code on the nucleo board.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Vanger 0:543eb4b01cda 1 #include "mbed.h"
Vanger 0:543eb4b01cda 2
Vanger 0:543eb4b01cda 3 // A simple and concise explanation of what this program does
Vanger 0:543eb4b01cda 4 /* Simple Hello World program that outputs "Hello World!" every
Vanger 0:543eb4b01cda 5 five seconds to the serial debug port, and blinks at the user
Vanger 0:543eb4b01cda 6 defined hertz
Vanger 0:543eb4b01cda 7 */
Vanger 0:543eb4b01cda 8
Vanger 0:543eb4b01cda 9 // LED blink rate: higher -> faster blinking
Vanger 0:543eb4b01cda 10 #define LED_BLINK_RATE 4 //Hertz
Vanger 0:543eb4b01cda 11
Vanger 0:543eb4b01cda 12 //Define the LED pin output
Vanger 0:543eb4b01cda 13 DigitalOut led(LED1);
Vanger 0:543eb4b01cda 14 //Define timers
Vanger 0:543eb4b01cda 15 Timer print_timer;
Vanger 0:543eb4b01cda 16 Timer led_timer;
Vanger 0:543eb4b01cda 17
Vanger 0:543eb4b01cda 18 int main() {
Vanger 0:543eb4b01cda 19 led = 0; //Initialize LED off
Vanger 0:543eb4b01cda 20 print_timer.start(); //Start timers, will count until stopped
Vanger 0:543eb4b01cda 21 led_timer.start();
Vanger 0:543eb4b01cda 22
Vanger 0:543eb4b01cda 23 while (1) {
Vanger 0:543eb4b01cda 24 if (print_timer.read() >= 5) { //print_timer.read() returns time in seconds
Vanger 0:543eb4b01cda 25 printf("Hello World!\n");
Vanger 0:543eb4b01cda 26 print_timer.reset(); //Resets timer count to 0
Vanger 0:543eb4b01cda 27 }
Vanger 0:543eb4b01cda 28
Vanger 0:543eb4b01cda 29 //Calculates interval needed for specified frequency
Vanger 0:543eb4b01cda 30 if ( led_timer.read_ms() >= (1000.0/(2*LED_BLINK_RATE))) {
Vanger 0:543eb4b01cda 31 led = !led; //Invert LED output
Vanger 0:543eb4b01cda 32 led_timer.reset(); //Resets timer count to 0
Vanger 0:543eb4b01cda 33 }
Vanger 0:543eb4b01cda 34 }
Vanger 0:543eb4b01cda 35 }