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added efm32 lightswitch example

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chrysn 2012-03-01 02:47:06 +01:00
parent 541fded753
commit 70ac046f98
3 changed files with 119 additions and 0 deletions
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examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2012 chrysn <chrysn@fsfe.org>
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program 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 General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = lightswitch
include ../Makefile.include

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examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/README Normal file
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============================================
EFM32-TG-STK3300 Examples lightswitch README
============================================
This is a small example program for GPIO input and output (and, in future, IRQ
handling).
It's intended for the EFM32-TG-STK3300 eval board. It turn the User LED on when
PB0 is pressed, and off when PB1 is pressed.

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examples/efm32/tinygecko/efm32-tg-stk3300/lightswitch/lightswitch.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2012 chrysn <chrysn@fsfe.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libopencm3/efm32/tinygecko/gpio.h>
#include <libopencm3/efm32/tinygecko/cmu.h>
void gpio_setup(void);
void led_on(void);
void led_off(void);
bool pb0_get(void);
bool pb1_get(void);
/** @file
* Example for switching the User LED of the EFM32-TG-STK330 eval board on and
* off using the buttons.
*/
int main(void)
{
gpio_setup();
while(1) {
if (pb0_get()) led_on();
if (pb1_get()) led_off();
};
}
/**
* Enable GPIO, and set up port D7 as an output pin.
*/
void gpio_setup(void)
{
// Before GPIO works, according to d0034_efm32tg_reference_manual.pdf
// note in section 28.3.7, we'll have to enable GPIO in CMU_HFPERCLKEN0
CMU_HFPERCLKEN0 |= CMU_HFPERCLKEN0_GPIO;
// The User LED is connected to PD7 to the plus side of the LED
// according to t0011_efm32_tiny_gecko_stk_user_manual.pdf figures 16.2
// and 16.3 (called UIF_LED0)
gpio_set_mode(GPIO_PD, GPIO_MODE_PUSHPULL, GPIO7);
// Button PB0 is connected to pin PD8 and pulled low when pushed,
// Botton PB1 to pin PB11 (sources as for LED). Pullups and debouncing
// are alreay in place in hardware, so no filtering or pullup is
// needed.
gpio_set_mode(GPIO_PD, GPIO_MODE_INPUT, GPIO8);
gpio_set_mode(GPIO_PB, GPIO_MODE_INPUT, GPIO11);
}
void led_on(void)
{
gpio_set(GPIO_PD, GPIO7);
}
void led_off(void)
{
gpio_clear(GPIO_PD, GPIO7);
}
bool pb0_get(void)
{
return !gpio_get(GPIO_PD, GPIO8);
}
bool pb1_get(void)
{
return !gpio_get(GPIO_PB, GPIO11);
}