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authorchrysn2012-02-25 18:57:11 +0100
committerchrysn2012-02-25 23:22:37 +0100
commit2180a02e2f79b8ee77780ea11be188c0faaa8866 (patch)
tree835991491d74d9626cf362ff52b0bcfc6eed4886 /lib
parent2b3f07ee08c722f28cbf480dbcc5276707f78ec4 (diff)
first attempt at porting libopencm3 to energymicro
unless sources are explicitly given, the linker scripts and make files were copied over from the stm32/f1 port.
Diffstat (limited to 'lib')
-rw-r--r--lib/efm32/tinygecko/EFM32TG840F32.ld15
-rw-r--r--lib/efm32/tinygecko/Makefile59
-rw-r--r--lib/efm32/tinygecko/devicerevision.c10
-rw-r--r--lib/efm32/tinygecko/tinygecko.ld78
-rw-r--r--lib/efm32/tinygecko/vector.c92
5 files changed, 254 insertions, 0 deletions
diff --git a/lib/efm32/tinygecko/EFM32TG840F32.ld b/lib/efm32/tinygecko/EFM32TG840F32.ld
new file mode 100644
index 0000000..f7baa90
--- /dev/null
+++ b/lib/efm32/tinygecko/EFM32TG840F32.ld
@@ -0,0 +1,15 @@
+/* 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;
diff --git a/lib/efm32/tinygecko/Makefile b/lib/efm32/tinygecko/Makefile
new file mode 100644
index 0000000..b785d4d
--- /dev/null
+++ b/lib/efm32/tinygecko/Makefile
@@ -0,0 +1,59 @@
+##
+## 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)
+
diff --git a/lib/efm32/tinygecko/devicerevision.c b/lib/efm32/tinygecko/devicerevision.c
new file mode 100644
index 0000000..216ab1b
--- /dev/null
+++ b/lib/efm32/tinygecko/devicerevision.c
@@ -0,0 +1,10 @@
+#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);
+}
diff --git a/lib/efm32/tinygecko/tinygecko.ld b/lib/efm32/tinygecko/tinygecko.ld
new file mode 100644
index 0000000..db3b81f
--- /dev/null
+++ b/lib/efm32/tinygecko/tinygecko.ld
@@ -0,0 +1,78 @@
+/*
+ * 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));
+
diff --git a/lib/efm32/tinygecko/vector.c b/lib/efm32/tinygecko/vector.c
new file mode 100644
index 0000000..0a7c09f
--- /dev/null
+++ b/lib/efm32/tinygecko/vector.c
@@ -0,0 +1,92 @@
+/*
+ * 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