chrysn 08918902ab made blinking a led on efm32 possible
this includes all register definitions for the gpu and mcu modules, but
not all their bit definitions
2012-02-25 23:22:37 +01:00

46 lines
1.5 KiB
C

/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* 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>
int main(void)
{
// FIXME: As of now, this doesn't work without x being volatile; an issue with linking?
volatile int x;
// 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_PD_MODEL = GPIO_MODE_PUSHPULL<<(7*4);
GPIO_PD_DOUTSET = 1<<7;
while(1) {
for(x = 0; x < 200000; ++x);
GPIO_PD_DOUTTGL = 1<<7;
};
}