Istvan Cserny / Mbed 2 deprecated 03_pwm_led

/** 03_pwm_led * This program controls the duty cycle of * a PWM output connected to LED1 (LED_RED) * through the serial connection. * * Valid commands: '1', '5', '9' * Corresponding duty cycle: 10%, 50%, 90% * Period: 2000 ms * * Hardware requirements: * - FRDM-KL25Z board */

Dependencies:   mbed

/ 03_pwm_led

  • This program controls the duty cycle of
  • a PWM output connected to LED1 (LED_RED)
  • through the serial connection.
  • Valid commands: '1', '5', '9'
  • Corresponding duty cycle: 10%, 50%, 90%
  • Period: 2000 ms
  • Hardware requirements:
  • - FRDM-KL25Z board
  • /

main.cpp@0:68ad188ca8c4, 2015-10-21 (annotated)

Committer:
icserny
Date:
Wed Oct 21 12:31:41 2015 +0000
Revision:
0:68ad188ca8c4
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
icserny 0:68ad188ca8c4 1 /** 03_pwm_led
icserny 0:68ad188ca8c4 2 * This program controls the duty cycle of
icserny 0:68ad188ca8c4 3 * a PWM output connected to LED1 (LED_RED)
icserny 0:68ad188ca8c4 4 * through the serial connection.
icserny 0:68ad188ca8c4 5 *
icserny 0:68ad188ca8c4 6 * Valid commands: '1', '5', '9'
icserny 0:68ad188ca8c4 7 * Corresponding duty cycle: 10%, 50%, 90%
icserny 0:68ad188ca8c4 8 * Period: 2000 ms
icserny 0:68ad188ca8c4 9 *
icserny 0:68ad188ca8c4 10 * Hardware requirements:
icserny 0:68ad188ca8c4 11 * - FRDM-KL25Z board
icserny 0:68ad188ca8c4 12 */
icserny 0:68ad188ca8c4 13
icserny 0:68ad188ca8c4 14 #include "mbed.h"
icserny 0:68ad188ca8c4 15
icserny 0:68ad188ca8c4 16 PwmOut myled(LED1);
icserny 0:68ad188ca8c4 17 Serial pc(USBTX, USBRX); // tx, rx
icserny 0:68ad188ca8c4 18
icserny 0:68ad188ca8c4 19 int main() {
icserny 0:68ad188ca8c4 20 myled.period_ms(20); //Period = 20 ms
icserny 0:68ad188ca8c4 21 myled.write(1.0); //Led off at start
icserny 0:68ad188ca8c4 22 pc.printf("\r\n03_pwm_led: this program controls the duty cycle of a \r\nPWM output connected to LED1 (LED_RED) through the serial connection.\r\n");
icserny 0:68ad188ca8c4 23 pc.printf("Period: 20 ms, Valid commands are: '1', '5', '9'\r\nThe corresponding duty cycle are: 1%, 50%, 99%\r\n");
icserny 0:68ad188ca8c4 24
icserny 0:68ad188ca8c4 25 while(1) {
icserny 0:68ad188ca8c4 26 char c = pc.getc(); //read next character
icserny 0:68ad188ca8c4 27 if(c=='1') {
icserny 0:68ad188ca8c4 28 myled = 0.99f; //LED has negative logic!
icserny 0:68ad188ca8c4 29 pc.printf("Duty cycle = 0.01\r\n");
icserny 0:68ad188ca8c4 30 }
icserny 0:68ad188ca8c4 31 else if(c=='5') {
icserny 0:68ad188ca8c4 32 myled = 0.5f;
icserny 0:68ad188ca8c4 33 pc.printf("Duty cycle = 0.5\r\n");
icserny 0:68ad188ca8c4 34 }
icserny 0:68ad188ca8c4 35 else if(c=='9') {
icserny 0:68ad188ca8c4 36 myled = 0.01f; //LED has negative logic!
icserny 0:68ad188ca8c4 37 pc.printf("Duty cycle = 0.99\r\n");
icserny 0:68ad188ca8c4 38 }
icserny 0:68ad188ca8c4 39 wait(0.2);
icserny 0:68ad188ca8c4 40 }
icserny 0:68ad188ca8c4 41 }