![](/media/cache/profiles/6c18d13e9a2e04855a83a6ce1a9117fe.jpg.50x50_q85.jpg)
/** 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 */
/ 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
- Committer:
- icserny
- Date:
- 2015-10-21
- Revision:
- 0:68ad188ca8c4
File content as of revision 0:68ad188ca8c4:
/** 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 */ #include "mbed.h" PwmOut myled(LED1); Serial pc(USBTX, USBRX); // tx, rx int main() { myled.period_ms(20); //Period = 20 ms myled.write(1.0); //Led off at start 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"); pc.printf("Period: 20 ms, Valid commands are: '1', '5', '9'\r\nThe corresponding duty cycle are: 1%, 50%, 99%\r\n"); while(1) { char c = pc.getc(); //read next character if(c=='1') { myled = 0.99f; //LED has negative logic! pc.printf("Duty cycle = 0.01\r\n"); } else if(c=='5') { myled = 0.5f; pc.printf("Duty cycle = 0.5\r\n"); } else if(c=='9') { myled = 0.01f; //LED has negative logic! pc.printf("Duty cycle = 0.99\r\n"); } wait(0.2); } }