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/*
* Copyright (C) 2014-2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Test for low-level PWM drivers
*
* This test initializes the given PWM device to run at 1KHz with a 1000 step
* resolution.
*
* The PWM is then continuously oscillating it's duty cycle between 0% to 100%
* every 1s on every channel.
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include <stdio.h>
#include "xtimer.h"
#include "timex.h"
#include "periph/pwm.h"
#define INTERVAL (10LU * US_PER_MS) /* 10 ms */
#define STEP (10)
#define MODE PWM_LEFT
#define FREQU (1000U)
#define STEPS (1000U)
int main(void)
{
int state = 0;
int step = STEP;
xtimer_ticks32_t last_wakeup = xtimer_now();
puts("\nRIOT PWM test");
puts("Connect an LED or scope to PWM pins to see something\n");
printf("Available PWM devices: %i\n", PWM_NUMOF);
for (int i = 0; i < PWM_NUMOF; i++) {
uint32_t real_f = pwm_init(PWM_DEV(i), MODE, FREQU, STEPS);
if (real_f == 0) {
printf("Error initializing PWM_%i\n", i);
return 1;
}
else {
printf("Initialized PWM_%i @ %" PRIu32 "Hz\n", i, real_f);
}
}
puts("\nLetting the PWM pins oscillate now...");
while (1) {
for (int i = 0; i < PWM_NUMOF; i++) {
for (uint8_t chan = 0; chan < pwm_channels(PWM_DEV(i)); chan++) {
pwm_set(PWM_DEV(i), chan, state);
}
}
state += step;
if (state <= 0 || state >= STEPS) {
step = -step;
}
xtimer_periodic_wakeup(&last_wakeup, INTERVAL);
}
return 0;
}