Analog Write¶
About¶
Write analog values to an analog output pin to form a sawtooth wave. Connect a LED to the analog output pin and watch the brightness of the LED change.
Source code¶
/**
* @file main.c
* @version 7.0.0
*
* @section License
* Copyright (C) 2015-2016, Erik Moqvist
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* This file is part of the Simba project.
*/
#include "simba.h"
int main()
{
int value;
struct analog_output_pin_t pin;
sys_start();
analog_output_pin_module_init();
/* Initialize the analog output pin. */
analog_output_pin_init(&pin, &pin_d10_dev);
value = 0;
while (1) {
/* Write a sawtooth wave to the analog output pin. */
analog_output_pin_write(&pin, value);
value += 5;
value %= 1024;
/* Wait ten milliseconds. */
thrd_sleep_us(10000);
}
return (0);
}
The source code can also be found on Github in the examples/analog_write folder.
Build and run¶
Build and upload the application.
$ cd examples/analog_write
$ make -s BOARD=<board> upload