/*
Raspberry Pi Pico SDK PWM Example
https://wokwi.com/projects/326847710095213139
Generates two 250khZ PWM signal (1 MHz clock, 4 cycle period) on pins 0, 1
Use the logic analyzer to view the signals: https://docs.wokwi.com/guides/logic-analyzer
*/
#include "pico/stdlib.h"
#include "hardware/pwm.h"
int main() {
// Tell GPIO 0 and 1 they are allocated to the PWM
gpio_set_function(0, GPIO_FUNC_PWM);
gpio_set_function(1, GPIO_FUNC_PWM);
// Find out which PWM slice is connected to GPIO 0 (it's slice 0)
uint slice_num = pwm_gpio_to_slice_num(0);
pwm_set_clkdiv(slice_num, 125); // pwm clock should now be running at 1MHz
// Set period of 4 cycles (0 to 3 inclusive)
pwm_set_wrap(slice_num, 3);
// Set channel A output high for one cycle before dropping
pwm_set_chan_level(slice_num, PWM_CHAN_A, 1);
// Set initial B output high for three cycles before dropping
pwm_set_chan_level(slice_num, PWM_CHAN_B, 3);
// Set the PWM running
pwm_set_enabled(slice_num, true);
// Note we could also use pwm_set_gpio_level(gpio, x) which looks up the
// correct slice and channel for a given GPIO.
while (1) {
sleep_ms(250);
}
}