NUCLEO-F042K6 Simple demo using PWM to controll LED brightness
Dependencies: mbed
main.cpp
- Committer:
- vodsejak
- Date:
- 2018-02-17
- Revision:
- 4:79eee74e1bbd
- Parent:
- 3:03bf4cc245ce
File content as of revision 4:79eee74e1bbd:
#include "mbed.h" // import of mbed library (required) /******************************************************************************* EXAMPLE DESCRIPTION Sets PWM out on pin PA_8 with f=200 Hz. Then changes duty cycle from 0 to 1 in 500 steps with 4 ms wait (from 0 to 1 in 1 s) and back from 1 to 0. The best use is to connect LED to pin PA_8 (using wiring with transitor) to see effect of PWM. *******************************************************************************/ PwmOut PWM(PA_8); // definition of PWM pin int main() { PWM.period_ms(5); // period of PWM - f=1/T -> f=1/0.005=200 Hz PWM.pulsewidth_us(0); // duration of active pulse //sets duty cycle - duty cycle = pulsewidth/period while(1) { for(int i=0;i<=5000;i=i+10){ PWM.pulsewidth_us(i); // increment duty cycle wait_ms(2); // wait 4 ms (whole for takes 1 s) } for(int i=5000;i>=0;i=i-10){ PWM.pulsewidth_us(i); // decrement duty cycle wait_ms(2); // wait 4 ms (whole for takes 1 s) } } }