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first attempt at porting libopencm3 to energymicro

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unless sources are explicitly given, the linker scripts and make files
were copied over from the stm32/f1 port.
This commit is contained in:
chrysn
2012-02-25 18:57:11 +01:00
parent 2b3f07ee08
commit 2180a02e2f
14 changed files with 559 additions and 0 deletions
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15
lib/efm32/tinygecko/EFM32TG840F32.ld Normal file
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/* lengths from d011_efm32tg840_datasheet.pdf table 1.1, offset from
* d0034_efm32tg_reference_manual.pdf figure 5.2.
*
* the origins and memory structure are constant over all tinygeckos, but the
* MEMORY section requires the use of constants, and has thus to be duplicated
* over the chip variants.
* */
MEMORY
{
rom (rx) : ORIGIN = 0, LENGTH = 32k
ram (rwx) : ORIGIN = 0x20000000, LENGTH = 4k
}
INCLUDE tinygecko.ld;

59
lib/efm32/tinygecko/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 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/>.
##
LIBNAME = libopencm3_efm32tinygecko
PREFIX ?= arm-none-eabi
#PREFIX ?= arm-elf
CC = $(PREFIX)-gcc
AR = $(PREFIX)-ar
CFLAGS = -Os -g -Wall -Wextra -I../../../include -fno-common \
-mcpu=cortex-m3 -mthumb -Wstrict-prototypes \
-ffunction-sections -fdata-sections -MD -DSTM32F1
# ARFLAGS = rcsv
ARFLAGS = rcs
OBJS = vector.o devicerevision.o
VPATH += ../
# Be silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)
Q := @
endif
all: $(LIBNAME).a
$(LIBNAME).a: $(OBJS)
@printf " AR $(subst $(shell pwd)/,,$(@))\n"
$(Q)$(AR) $(ARFLAGS) $@ $^
%.o: %.c
@printf " CC $(subst $(shell pwd)/,,$(@))\n"
$(Q)$(CC) $(CFLAGS) -o $@ -c $<
clean:
@printf " CLEAN lib/efm32/tinygecko\n"
$(Q)rm -f *.o *.d
$(Q)rm -f $(LIBNAME).a
.PHONY: clean
-include $(OBJS:.o=.d)

10
lib/efm32/tinygecko/devicerevision.c Normal file
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#include <libopencm3/efm32/tinygecko/devicerevision.h>
u8 devicerevision_revision_get(void)
{
/* probably this is more elegant, more readable and closer to the spec,
* and i'll just get used to doing things like that:
return (DEVICEREVISION_PID2 & 0xf0) | ((DEVICEREVISION_PID3 & 0xf0) >> 4);
*/
return ((DEVICEREVISION_PID2 & DEVICEREVISION_REVISION_MASK) >> DEVICEREVISION_REVISION_SHIFT << DEVICEREVISION_REVISION_LENGTH) | ((DEVICEREVISION_PID3 & DEVICEREVISION_REVISION_MASK) >> DEVICEREVISION_REVISION_SHIFT);
}

78
lib/efm32/tinygecko/tinygecko.ld Normal file
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/*
* 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/>.
*/
/* Generic linker script for EFM32 targets using libopencm3. */
/* Memory regions must be defined in the ld script which includes this one. */
/* Enforce emmition of the vector table. */
EXTERN (vector_table)
/* Define the entry point of the output file. */
ENTRY(reset_handler)
/* Define sections. */
SECTIONS
{
. = ORIGIN(rom);
.text : {
*(.vectors) /* Vector table */
*(.text*) /* Program code */
. = ALIGN(4);
*(.rodata*) /* Read-only data */
. = ALIGN(4);
_etext = .;
} >rom
. = ORIGIN(ram);
.data : AT(_etext) {
_data = .;
*(.data*) /* Read-write initialized data */
. = ALIGN(4);
_edata = .;
} >ram
.bss : {
*(.bss*) /* Read-write zero initialized data */
*(COMMON)
. = ALIGN(4);
_ebss = .;
} >ram AT >rom
/*
* The .eh_frame section appears to be used for C++ exception handling.
* You may need to fix this if you're using C++.
*/
/DISCARD/ : { *(.eh_frame) }
/*
* Another section used by C++ stuff, appears when using newlib with
* 64bit (long long) printf support - discard it for now.
*/
/DISCARD/ : { *(.ARM.exidx) }
. = ALIGN(4);
end = .;
}
PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram));

92
lib/efm32/tinygecko/vector.c Normal file
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>,
* 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/vector.h>
#define WEAK __attribute__ ((weak))
/* Symbols exported by the linker script(s). */
extern unsigned _etext, _data, _edata, _ebss, _stack;
void main(void);
void reset_handler(void);
void blocking_handler(void);
void null_handler(void);
void WEAK nmi_handler(void);
void WEAK hard_fault_handler(void);
void WEAK mem_manage_handler(void);
void WEAK bus_fault_handler(void);
void WEAK usage_fault_handler(void);
void WEAK sv_call_handler(void);
void WEAK debug_monitor_handler(void);
void WEAK pend_sv_handler(void);
void WEAK sys_tick_handler(void);
__attribute__ ((section(".vectors")))
efm32_vector_table_t vector_table = {
.initial_sp_value = &_stack,
.reset = reset_handler,
.nmi = nmi_handler,
.hard_fault = hard_fault_handler,
.memory_manage_fault = mem_manage_handler,
.bus_fault = bus_fault_handler,
.usage_fault = usage_fault_handler,
.sv_call = sv_call_handler,
.pend_sv = pend_sv_handler,
.systick = sys_tick_handler,
};
void reset_handler(void)
{
volatile unsigned *src, *dest;
__asm__("MSR msp, %0" : : "r"(&_stack));
for (src = &_etext, dest = &_data; dest < &_edata; src++, dest++)
*dest = *src;
while (dest < &_ebss)
*dest++ = 0;
/* Call the application's entry point. */
main();
}
void blocking_handler(void)
{
while (1) ;
}
void null_handler(void)
{
/* Do nothing. */
}
#pragma weak nmi_handler = null_handler
#pragma weak hard_fault_handler = blocking_handler
#pragma weak mem_manage_handler = blocking_handler
#pragma weak bus_fault_handler = blocking_handler
#pragma weak usage_fault_handler = blocking_handler
#pragma weak sv_call_handler = null_handler
#pragma weak debug_monitor_handler = null_handler
#pragma weak pend_sv_handler = null_handler
#pragma weak sys_tick_handler = null_handler