89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 chrysn <chrysn@fsfe.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/efm32/tinygecko/gpio.h>
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#include <libopencm3/efm32/tinygecko/cmu.h>
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void gpio_setup(void);
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void led_on(void);
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void led_off(void);
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bool pb0_get(void);
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bool pb1_get(void);
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/** @file
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* Example for switching the User LED of the EFM32-TG-STK330 eval board on and
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* off using the buttons.
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*/
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int main(void)
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{
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gpio_setup();
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while(1) {
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if (pb0_get()) led_on();
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if (pb1_get()) led_off();
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};
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}
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/**
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* Enable GPIO, and set up port D7 as an output pin.
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*/
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void gpio_setup(void)
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{
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// Before GPIO works, according to d0034_efm32tg_reference_manual.pdf
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// note in section 28.3.7, we'll have to enable GPIO in CMU_HFPERCLKEN0
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CMU_HFPERCLKEN0 |= CMU_HFPERCLKEN0_GPIO;
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// The User LED is connected to PD7 to the plus side of the LED
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// according to t0011_efm32_tiny_gecko_stk_user_manual.pdf figures 16.2
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// and 16.3 (called UIF_LED0)
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gpio_set_mode(GPIO_PD, GPIO_MODE_PUSHPULL, GPIO7);
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// Button PB0 is connected to pin PD8 and pulled low when pushed,
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// Botton PB1 to pin PB11 (sources as for LED). Pullups and debouncing
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// are alreay in place in hardware, so no filtering or pullup is
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// needed.
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gpio_set_mode(GPIO_PD, GPIO_MODE_INPUT, GPIO8);
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gpio_set_mode(GPIO_PB, GPIO_MODE_INPUT, GPIO11);
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}
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void led_on(void)
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{
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gpio_set(GPIO_PD, GPIO7);
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}
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void led_off(void)
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{
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gpio_clear(GPIO_PD, GPIO7);
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}
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bool pb0_get(void)
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{
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return !gpio_get(GPIO_PD, GPIO8);
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}
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bool pb1_get(void)
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{
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return !gpio_get(GPIO_PB, GPIO11);
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}
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