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Merge branch 'master' of github.com:insane-adding-machines/libopencm3-examples
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‎Makefile

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@@ -25,6 +25,7 @@ TARGETS += lpc/lpc13xx lpc/lpc17xx #lpc/lpc43xx
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TARGETS += tiva/lm3s tiva/lm4f
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TARGETS += efm32/efm32tg efm32/efm32g efm32/efm32lg efm32/efm32gg
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TARGETS += vf6xx
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TARGETS += qemu
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)

‎examples/qemu/Makefile.include

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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2016 Daniele Lacamera <[email protected]>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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LIBNAME = opencm3_lm3s
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DEFS += -DLM3S
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FP_FLAGS ?= -mfloat-abi=soft
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ARCH_FLAGS = -mthumb -mcpu=cortex-m3 $(FP_FLAGS)
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################################################################################
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# OpenOCD specific variables
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OOCD ?= openocd
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OOCD_BOARD ?= lm3s6965
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################################################################################
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# Black Magic Probe specific variables
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# Set the BMP_PORT to a serial port and then BMP is used for flashing
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BMP_PORT ?=
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################################################################################
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# texane/stlink specific variables
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#STLINK_PORT ?= :4242
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include ../../../Makefile.rules

‎examples/qemu/lm3s/lm3s6965-evb/Makefile

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##
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## This file is part of the libopencm3 project.
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##
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## Copyright (C) 2016 Daniele Lacamera <[email protected]>
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##
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## This library is free software: you can redistribute it and/or modify
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## it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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##
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## You should have received a copy of the GNU Lesser General Public License
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## along with this library. If not, see <http://www.gnu.org/licenses/>.
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##
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BINARY = qemu-lm3s
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LDSCRIPT = lm3s6965.ld
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include ../../Makefile.include
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‎examples/qemu/lm3s/lm3s6965-evb/README.md

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This project is used as a demonstrator on how to run a small baremetal application
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on a LM3S6965 board, which can be emulated on qemu as well (using qemu-system-arm
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with -M lm3s6965evb).
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For this reason, this application is not portable to other platforms at the moment.
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To execute in qemu run:
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`make qemu`
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To debug using gcc run:
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`make qemu-dbg`
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and then attach a gdb to localhost tcp port 3333.
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Requirements:
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qemu-system-arm
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openocd
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‎examples/qemu/lm3s/lm3s6965-evb/libopencm3_lm3s.ld

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/*
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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 <[email protected]>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Generic linker script for LM3S targets using libopencm3. */
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/* Memory regions must be defined in the ld script which includes this one. */
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/* Enforce emmition of the vector table. */
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EXTERN (vector_table)
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/* Define the entry point of the output file. */
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ENTRY(reset_handler)
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/* Define sections. */
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SECTIONS
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{
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.text : {
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*(.vectors) /* Vector table */
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*(.text*) /* Program code */
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. = ALIGN(4);
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*(.rodata*) /* Read-only data */
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. = ALIGN(4);
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} >rom
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/* C++ Static constructors/destructors, also used for __attribute__
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* ((constructor)) and the likes */
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.preinit_array : {
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. = ALIGN(4);
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__preinit_array_start = .;
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KEEP (*(.preinit_array))
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__preinit_array_end = .;
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} >rom
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.init_array : {
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. = ALIGN(4);
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__init_array_start = .;
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KEEP (*(SORT(.init_array.*)))
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KEEP (*(.init_array))
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__init_array_end = .;
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} >rom
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.fini_array : {
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. = ALIGN(4);
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__fini_array_start = .;
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KEEP (*(.fini_array))
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KEEP (*(SORT(.fini_array.*)))
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__fini_array_end = .;
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} >rom
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/*
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* Another section used by C++ stuff, appears when using newlib with
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* 64bit (long long) printf support
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*/
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.ARM.extab : {
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*(.ARM.extab*)
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} >rom
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.ARM.exidx : {
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__exidx_start = .;
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*(.ARM.exidx*)
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__exidx_end = .;
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} >rom
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. = ALIGN(4);
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_etext = .;
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.data : {
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_data = .;
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*(.data*) /* Read-write initialized data */
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. = ALIGN(4);
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_edata = .;
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} >ram AT >rom
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_data_loadaddr = LOADADDR(.data);
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.bss : {
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*(.bss*) /* Read-write zero initialized data */
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*(COMMON)
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. = ALIGN(4);
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_ebss = .;
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} >ram
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/*
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* The .eh_frame section appears to be used for C++ exception handling.
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* You may need to fix this if you're using C++.
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*/
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/DISCARD/ : { *(.eh_frame) }
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. = ALIGN(4);
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end = .;
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}
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PROVIDE(_stack = ORIGIN(ram) + LENGTH(ram));
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‎examples/qemu/lm3s/lm3s6965-evb/lm3s6965.ld

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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2016 Daniele Lacamera <[email protected]>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* Linker script for the LM3S6965 chip (256K flash, 64K RAM). */
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/* Define memory regions. */
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MEMORY
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{
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rom (rx) : ORIGIN = 0x00000000, LENGTH = 256K
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ram (rwx) : ORIGIN = 0x20000000, LENGTH = 64K
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}
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/* Include the common ld script. */
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INCLUDE libopencm3_lm3s.ld
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‎examples/qemu/lm3s/lm3s6965-evb/qemu-lm3s.c

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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2016 Daniele Lacamera <[email protected]>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser 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 library 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/cm3/systick.h>
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#include <libopencmsis/core_cm3.h>
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/* LM3S Specifics, usart and RCC */
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#include <libopencm3/lm3s/rcc.h>
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#include <libopencm3/lm3s/usart.h>
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static volatile uint32_t jiffies = 0u;
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static void printbanner(void)
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{
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char msg[] = "One second elapsed!\r\n";
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char *c = msg;
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while (*c != 0) {
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usart_send(USART0_BASE, (uint16_t )*c);
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c++;
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}
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}
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void sys_tick_handler(void)
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{
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jiffies++;
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}
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static inline uint32_t systick_app_config(uint32_t n_ticks)
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{
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/* constant from systick_set_reload -- as this returns something that's
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* * not void, this is the only possible error condition */
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if (n_ticks & ~0x00FFFFFF) {
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return 1;
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}
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systick_set_reload(n_ticks);
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systick_set_clocksource(1);
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systick_interrupt_enable();
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systick_counter_enable();
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return 0;
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}
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#define HZ 1000
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int main(void)
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{
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rcc_clock_setup_in_xtal_8mhz_out_50mhz();
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systick_app_config(HZ);
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nvic_set_priority(NVIC_SYSTICK_IRQ, 0);
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jiffies = 0;
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while(1) {
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if (jiffies > HZ) {
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printbanner();
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jiffies = 0;
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}
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}
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}

‎examples/qemu/lm3s/lm3s6965-evb/run.sh

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#!/bin/sh
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qemu-system-arm -semihosting -M lm3s6965evb --kernel ./qemu-lm3s.elf -serial stdio

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