Tony Jeon / Mbed 2 deprecated SimplePWM

Simple PWM for motor control

Dependencies:   mbed

This program is for motor control with Arduino motor shield and LCP 1768.

For motor control with arduino motor shield, it needs direction signal and brake signal. Maybe brake signal is optional. So, the code use three pins, direction(gpio), brake(gpio) and PWM output.

- Schematic /media/uploads/hjjeon/lpc1768_motor_shield_schem.jpg

main.cpp@2:4eb08f46fc91, 2014-11-18 (annotated)

Committer:
hjjeon
Date:
Tue Nov 18 02:22:12 2014 +0000
Revision:
2:4eb08f46fc91
Parent:
1:4f47e58cd882 
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Who changed what in which revision?

UserRevisionLine numberNew contents of line
hjjeon 0:5f85a7752a04 1 #include "mbed.h"
hjjeon 0:5f85a7752a04 2
hjjeon 0:5f85a7752a04 3 #define FORWARD 0
hjjeon 0:5f85a7752a04 4 #define BACKWARD 1
hjjeon 0:5f85a7752a04 5
hjjeon 0:5f85a7752a04 6
hjjeon 0:5f85a7752a04 7 int main() {
hjjeon 0:5f85a7752a04 8
hjjeon 0:5f85a7752a04 9 Serial pc(USBTX, USBRX);
hjjeon 0:5f85a7752a04 10 pc.baud(115200);
hjjeon 0:5f85a7752a04 11
hjjeon 2:4eb08f46fc91 12 // This program is for NXP LPC1768. If you use other platform, change pin number!! ============
hjjeon 1:4f47e58cd882 13 PwmOut mypwm(p21);// NXP 1768 platform PWM output
hjjeon 1:4f47e58cd882 14 DigitalOut direction(p5);// NXP 1768 platform GPIO pin #5 output
hjjeon 1:4f47e58cd882 15 DigitalOut brake(p6);// NXP 1768 platform GPIO pin #6 output
hjjeon 2:4eb08f46fc91 16 DigitalOut myled(LED1);//For LED blinking.
hjjeon 2:4eb08f46fc91 17 //=============================================================================================
hjjeon 0:5f85a7752a04 18
hjjeon 0:5f85a7752a04 19 direction = FORWARD;// FORWARD == 0;.
hjjeon 0:5f85a7752a04 20
hjjeon 0:5f85a7752a04 21 while(1) {
hjjeon 0:5f85a7752a04 22 myled = !myled;
hjjeon 1:4f47e58cd882 23 mypwm = mypwm + 0.05;// 0.05 is 5% duty pulse width
hjjeon 0:5f85a7752a04 24 wait(3);
hjjeon 0:5f85a7752a04 25 if( mypwm >= 1)
hjjeon 0:5f85a7752a04 26 {
hjjeon 0:5f85a7752a04 27 brake = 1; //stop
hjjeon 0:5f85a7752a04 28 }
hjjeon 0:5f85a7752a04 29 }
hjjeon 0:5f85a7752a04 30 }