48b3cd49fb
this *does* include hardcoded paths of my local machine; that will be fixed with the next commits.
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
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* Copyright (C) 2012 chrysn <chrysn@fsfe.org>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <efm32_cmu.h>
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#include <efm32_gpio.h>
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void led_setup(void);
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void led_toggle(void);
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/** @file
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* Minimal example for making the User LED of the EFM32-TG-STK330 eval board blink.
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*/
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/**
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* Toggle the User LED in an infinite loop, with time between the toggling
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* determined by a busy loop stupidly counting up.
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*/
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int main(void)
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{
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int x;
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led_setup();
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while(1) {
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for(x = 0; x < 200000; ++x) asm("mov r0,r0"); /* no-op, prevent compiler from optimizing this away */
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led_toggle();
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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 led_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_MASK;
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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_PinModeSet(gpioPortD, 7, gpioModePushPull, 0);
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}
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void led_toggle(void)
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{
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GPIO_PinOutToggle(gpioPortD, 7);
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}
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