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first working example utilizing efm32lib 

this *does* include hardcoded paths of my local machine; that will be
fixed with the next commits.
This commit is contained in:
chrysn 2012-03-23 01:18:16 +01:00
parent da4567a035
commit 48b3cd49fb
6 changed files with 147 additions and 0 deletions
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26
examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/Makefile Normal file
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##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright (C) 2012 chrysn <chrysn@fsfe.org>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library 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 Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library. If not, see <http://www.gnu.org/licenses/>.
##
BINARY = miniblink
OBJS += efm32_gpio.o efm32_cmu.o
CFLAGS += -I/tmp/EFM32_CMSIS_2.4.1/efm32lib/inc/ -I /tmp/EFM32_CMSIS_2.4.1/CMSIS/CM3/DeviceSupport/EnergyMicro/EFM32/ -DEFM32TG840F32 -I.
include ../Makefile.include

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examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/README Normal file
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===================================================
EFM32-TG-STK3300 Examples miniblink-efm32lib README
===================================================
This is a port of the miniblink example to the efm32lib library.
It's intended for the EFM32-TG-STK3300 eval board. It should blink the user LED
on the board, just as the original miniblink example does.

41
examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/core_cm3.h Normal file
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/* the original core_cm3.h is nonfree by arm; this provides libopencm3 variant of the symbols efm32lib needs of CMSIS. */
#include <stdint.h>
/* needed by system_efm32.h:196, guessing */
#define __INLINE inline
/* needed around efm32tg840f32.h:229. comparing the efm32lib definitions to the
* libopencm3 ones, "volatile" is all that's missing. */
#define __IO volatile
#define __O volatile
#define __I volatile
/* -> style access for what is defined in libopencm3/stm32/f1/scb.h /
* cm3/memorymap.h, as it's needed by efm32lib/inc/efm32_emu.h */
/* from stm32/f1/scb.h */
#define SCB_SCR_SLEEPDEEP_Msk (1 << 2)
/* structure as in, for example,
* DeviceSupport/EnergyMicro/EFM32/efm32tg840f32.h, data from
* libopencm3/stm32/f1/scb.h. incomplete. */
typedef struct
{
__IO uint32_t CPUID;
__IO uint32_t ICSR;
__IO uint32_t VTOR;
__IO uint32_t AIRCR;
__IO uint32_t SCR;
__IO uint32_t CCR;
} SCB_TypeDef;
#define SCB ((SCB_TypeDef *) SCB_BASE)
/* from libopencm3/cm3/memorymap.h */
#define PPBI_BASE 0xE0000000
#define SCS_BASE (PPBI_BASE + 0xE000)
#define SCB_BASE (SCS_BASE + 0x0D00)
/* needed by efm32_emu.h, guessing and taking the implementation used in
* lightswitch-interrupt.c */
#define __WFI() __asm__("wfi")
/* needed by efm32_cmu.h, probably it's just what gcc provides anyway */
#define __CLZ(div) __builtin_clz(div)

1
examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/efm32_cmu.c Symbolic link
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/tmp/EFM32_CMSIS_2.4.1/efm32lib/src/efm32_cmu.c

1
examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/efm32_gpio.c Symbolic link
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/tmp/EFM32_CMSIS_2.4.1/efm32lib/src/efm32_gpio.c

69
examples/efm32/tinygecko/efm32-tg-stk3300/miniblink-efm32lib/miniblink.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
* Copyright (C) 2012 chrysn <chrysn@fsfe.org>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <efm32_cmu.h>
#include <efm32_gpio.h>
void led_setup(void);
void led_toggle(void);
/** @file
* Minimal example for making the User LED of the EFM32-TG-STK330 eval board blink.
*/
/**
* Toggle the User LED in an infinite loop, with time between the toggling
* determined by a busy loop stupidly counting up.
*/
int main(void)
{
int x;
led_setup();
while(1) {
for(x = 0; x < 200000; ++x) asm("mov r0,r0"); /* no-op, prevent compiler from optimizing this away */
led_toggle();
};
}
/**
* Enable GPIO, and set up port D7 as an output pin.
*/
void led_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_MASK;
// 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_PinModeSet(gpioPortD, 7, gpioModePushPull, 0);
}
void led_toggle(void)
{
GPIO_PinOutToggle(gpioPortD, 7);
}