Robert Banu / Mbed 2 deprecated Project

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Dependencies:   mbed

main.cpp@0:8c4301046871, 2019-09-20 (annotated)

Committer:
BRD
Date:
Fri Sep 20 07:46:16 2019 +0000
Revision:
0:8c4301046871
First;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
BRD 0:8c4301046871 1 // For this example, you need the BioRobotics shield.
BRD 0:8c4301046871 2 // Connect POT2 (frequency)to A0
BRD 0:8c4301046871 3 // Connect POT1 (pwm) to A1
BRD 0:8c4301046871 4 #include "mbed.h"
BRD 0:8c4301046871 5 #include <math.h>
BRD 0:8c4301046871 6
BRD 0:8c4301046871 7 DigitalOut gpo(D0);
BRD 0:8c4301046871 8 DigitalOut led(LED_RED);
BRD 0:8c4301046871 9 AnalogIn freq(A0);
BRD 0:8c4301046871 10 AnalogIn pwm(A1);
BRD 0:8c4301046871 11 Ticker ReadPotmetersTicker;
BRD 0:8c4301046871 12 volatile double frequency_Hz=1;
BRD 0:8c4301046871 13 volatile double pwm_pct = 50;
BRD 0:8c4301046871 14 volatile int on_time_us; // The time the LED should be on, in microseconds
BRD 0:8c4301046871 15 volatile int off_time_us;
BRD 0:8c4301046871 16
BRD 0:8c4301046871 17 void ReadPotmeterValues(void)
BRD 0:8c4301046871 18 {
BRD 0:8c4301046871 19 frequency_Hz = 1 + pow((double)freq.read(),4) * 50; // Frequency ranges from 1 to 50 Hz
BRD 0:8c4301046871 20 pwm_pct = pwm.read() * 100;
BRD 0:8c4301046871 21 on_time_us = (int) ((pwm_pct/100.0) * (1.0/frequency_Hz) * 1.0e6);
BRD 0:8c4301046871 22 off_time_us = (int) (( (100.0-pwm_pct)/100.0) * (1.0/frequency_Hz) * 1.0e6);
BRD 0:8c4301046871 23 }
BRD 0:8c4301046871 24
BRD 0:8c4301046871 25 int main()
BRD 0:8c4301046871 26 {
BRD 0:8c4301046871 27 ReadPotmetersTicker.attach(ReadPotmeterValues, 0.1);
BRD 0:8c4301046871 28
BRD 0:8c4301046871 29 while (true)
BRD 0:8c4301046871 30 {
BRD 0:8c4301046871 31 led = 0; // Turn led on
BRD 0:8c4301046871 32 wait_us(on_time_us);
BRD 0:8c4301046871 33 led = 1; // Turn led on
BRD 0:8c4301046871 34 wait_us(off_time_us);
BRD 0:8c4301046871 35 }
BRD 0:8c4301046871 36 }