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tests: added test for low-level PWM driver

dev/timer
Hauke Petersen 9 years ago
parent
commit
b0d3a55989
  1. 11
      tests/periph_pwm/Makefile
  2. 8
      tests/periph_pwm/README.md
  3. 91
      tests/periph_pwm/main.c

11
tests/periph_pwm/Makefile

@ -0,0 +1,11 @@
export APPLICATION = periph_pwm
include ../Makefile.tests_common
BOARD_BLACKLIST := chronos mbed_lpc1768 msb-430 msb-430h native qemu-i386 redbee-econotag telosb \
wsn430-v1_3b wsn430-v1_4 z1
# all listed boards: no periph_conf.h defined,
USEMODULE += vtimer
DISABLE_MODULE += auto_init
include $(RIOTBASE)/Makefile.include

8
tests/periph_pwm/README.md

@ -0,0 +1,8 @@
Expected result
===============
If everything is running as supposed to, you should see a 1KHz PWM with oscillating duty cycle
on each channel of the selected PWM device.
Background
==========
Test for the low-level PWM driver.

91
tests/periph_pwm/main.c

@ -0,0 +1,91 @@
/*
* Copyright (C) 2014 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 "cpu.h"
#include "board.h"
#include "vtimer.h"
#include "periph/pwm.h"
/* only compile this test if PWM devices are defined */
#if PWM_NUMOF
#define WAIT (10000)
#define STEP (10)
#define DEV PWM_0
#define CHANNELS PWM_0_CHANNELS
#define MODE PWM_LEFT
#define FREQU (1000U)
#define STEPS (1000U)
int main(void)
{
int res;
int state = 0;
int step = STEP;
puts("\nRIOT PWM test");
puts("Connect an LED or scope to PWM pins to see something\n");
res = pwm_init(DEV, MODE, FREQU, STEPS);
if (res == 0) {
puts("PWM successfully initialized.\n");
}
else {
puts("Errors while initializing PWM");
return -1;
}
while (1) {
for (int i = 0; i < CHANNELS; i++) {
pwm_set(DEV, i, state);
}
state += step;
if (state <= 0 || state >= STEPS) {
step = -step;
}
vtimer_usleep(WAIT);
}
return 0;
}
#else
int main(void)
{
puts("\nRIOT PWM test");
puts("There are no PWM devices defined for this board!");
return 0;
}
#endif /* PWM_NUMOF */
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