2275ed7b0c
includes minor refactoring in example code and modification of how the generic and the tinygecko specific vector.h go together (bringing it in line with stm32/f1's memorymap.h)
71 lines
1.9 KiB
C
71 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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* 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 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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// FIXME: As of now, this doesn't work without x being volatile; an issue with linking?
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volatile int x;
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led_setup();
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while(1) {
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for(x = 0; x < 200000; ++x);
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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;
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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_PD_MODEL = GPIO_MODE_PUSHPULL<<(7*4);
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}
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void led_toggle(void)
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{
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GPIO_PD_DOUTTGL = 1<<7;
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}
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