Initial commit.
This commit is contained in:
Piotr Esden-Tempski
@@ -0,0 +1,143 @@
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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 <uwe@hermann-uwe.de>
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## Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
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## Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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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 undebipr 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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PREFIX ?= arm-none-eabi
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CC = $(PREFIX)-gcc
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LD = $(PREFIX)-gcc
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OBJCOPY = $(PREFIX)-objcopy
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OBJDUMP = $(PREFIX)-objdump
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TOOLCHAIN_DIR ?= ../../../..
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ifeq ($(wildcard ../../../../lib/libopencm3_lm4f.a),)
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ifneq ($(strip $(shell which $(CC))),)
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TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
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endif
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else
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ifeq ($(V),1)
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$(info We seem to be building the example in the source directory. Using local library!)
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endif
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endif
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ARCH_FLAGS = -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
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CFLAGS += -O0 -g3 \
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-Wall -Wextra -Wimplicit-function-declaration \
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-Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes \
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-Wundef -Wshadow \
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-I$(TOOLCHAIN_DIR)/include \
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-fno-common $(ARCH_FLAGS) -MD -DLM4F
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LDSCRIPT ?= $(BINARY).ld
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LDFLAGS += --static -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group \
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-L$(TOOLCHAIN_DIR)/lib \
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-T$(LDSCRIPT) -nostartfiles -Wl,--gc-sections \
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$(ARCH_FLAGS)
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OBJS += $(BINARY).o
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# Support for ICDI is not in any openocd release as of yet
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# A patch to add support for ICDI is under review
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OOCD ?= openocd
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OOCD_INTERFACE ?= ti-icdi
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# No official board.cfg for the stellaris launchpad
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OOCD_BOARD ?= stellaris_launchpad
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# Be silent per default, but 'make V=1' will show all compiler calls.
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ifneq ($(V),1)
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Q := @
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NULL := 2>/dev/null
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else
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LDFLAGS += -Wl,--print-gc-sections
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endif
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.SUFFIXES: .elf .bin .hex .srec .list .images
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.SECONDEXPANSION:
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.SECONDARY:
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all: images
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images: $(BINARY).images
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flash: $(BINARY).flash
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%.images: %.bin %.hex %.srec %.list
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@#echo "*** $* images generated ***"
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%.bin: %.elf
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@#printf " OBJCOPY $(*).bin\n"
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$(Q)$(OBJCOPY) -Obinary $(*).elf $(*).bin
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%.hex: %.elf
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@#printf " OBJCOPY $(*).hex\n"
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$(Q)$(OBJCOPY) -Oihex $(*).elf $(*).hex
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%.srec: %.elf
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@#printf " OBJCOPY $(*).srec\n"
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$(Q)$(OBJCOPY) -Osrec $(*).elf $(*).srec
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%.list: %.elf
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@#printf " OBJDUMP $(*).list\n"
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$(Q)$(OBJDUMP) -S $(*).elf > $(*).list
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%.elf: $(OBJS) $(LDSCRIPT) $(TOOLCHAIN_DIR)/lib/libopencm3_lm4f.a
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@#printf " LD $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(LD) -o $(*).elf $(OBJS) -lopencm3_lm4f $(LDFLAGS)
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%.o: %.c Makefile
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@#printf " CC $(subst $(shell pwd)/,,$(@))\n"
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$(Q)$(CC) $(CFLAGS) -o $@ -c $<
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clean:
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$(Q)rm -f *.o
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$(Q)rm -f *.d
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$(Q)rm -f *.elf
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$(Q)rm -f *.bin
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$(Q)rm -f *.hex
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$(Q)rm -f *.srec
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$(Q)rm -f *.list
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# FIXME: Replace STM32 stuff with proper Stellaris support.
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ifeq ($(OOCD_SERIAL),)
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%.flash: %.hex
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@printf " FLASH $<\n"
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@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
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$(Q)$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
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-f board/$(OOCD_BOARD).cfg \
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-c "init" -c "reset init" \
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-c "stm32x mass_erase 0" \
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-c "flash write_image $(*).hex" \
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-c "reset" \
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-c "shutdown" $(NULL)
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else
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%.flash: %.hex
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@printf " FLASH $<\n"
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@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
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$(Q)$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
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-f board/$(OOCD_BOARD).cfg \
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-c "ft2232_serial $(OOCD_SERIAL)" \
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-c "init" -c "reset init" \
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-c "stm32x mass_erase 0" \
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-c "flash write_image $(*).hex" \
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-c "reset" \
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-c "shutdown" $(NULL)
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endif
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.PHONY: images clean
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-include $(OBJS:.o=.d)
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@@ -0,0 +1,31 @@
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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) 2010 Uwe Hermann <uwe@hermann-uwe.de>
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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 TI Stellaris EX-LM4F120XL evaluation board. */
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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 = 32K
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}
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/* Include the common ld script. */
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INCLUDE libopencm3_lm4f.ld
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@@ -0,0 +1,25 @@
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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) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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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 = miniblink
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LDSCRIPT = ../ek-lm4f120xl.ld
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include ../../Makefile.include
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@@ -0,0 +1,22 @@
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------------------------------------------------------------------------------
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README
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------------------------------------------------------------------------------
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This example demonstrates the following:
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* Configuriong GPIO pins
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* Toggling GPIO pins
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* Setting up and using GPIO interrupts
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* Unlocking protected GPIO pins
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* Controlling the system clock
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* Changing the system clock on the fly
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Flashes the Red, Green and Blue diodes on the board, in order. The system clock
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starts at 80MHz.
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Pressing SW2 toggles the system clock between 80MHz, 57MHz, 40MHz ,20MHz, and
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16MHz by changing the PLL divisor.
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Pressing SW1 bypasses the PLL completely, and runs off the raw 16MHz clock
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provided by the external crystal oscillator.
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The LEDs will toggle at different speeds, depending on the system clock. The
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system clock changes are handled within the interrupt service routine.
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@@ -0,0 +1,217 @@
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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) 2011 Gareth McMullin <gareth@blacksphere.co.nz>
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* Copyright (C) 2012-2013 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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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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/**
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* \addtogroup Examples
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*
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* Flashes the Red, Green and Blue diodes on the board, in order.
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*
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* RED controlled by PF1
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* Green controlled by PF3
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* Blue controlled by PF2
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*/
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#include <libopencm3/cm3/nvic.h>
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#include <libopencm3/lm4f/systemcontrol.h>
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#include <libopencm3/lm4f/rcc.h>
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#include <libopencm3/lm4f/gpio.h>
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#include <libopencm3/lm4f/nvic.h>
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#include <stdbool.h>
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#include <stdio.h>
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/* This is how the RGB LED is connected on the stellaris launchpad */
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#define RGB_PORT GPIOF
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enum {
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LED_R = GPIO1,
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LED_G = GPIO3,
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LED_B = GPIO2,
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};
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/* This is how the user switches are connected to GPIOF */
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enum {
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USR_SW1 = GPIO4,
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USR_SW2 = GPIO0,
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};
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/* The divisors we loop through when the user presses SW2 */
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enum {
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PLL_DIV_80MHZ = 5,
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PLL_DIV_57MHZ = 7,
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PLL_DIV_40MHZ = 10,
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PLL_DIV_20MHZ = 20,
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PLL_DIV_16MHZ = 25,
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};
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static const u8 plldiv[] = {
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PLL_DIV_80MHZ,
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PLL_DIV_57MHZ,
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PLL_DIV_40MHZ,
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PLL_DIV_20MHZ,
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PLL_DIV_16MHZ,
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0
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};
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/* The PLL divisor we are currently on */
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static size_t ipll = 0;
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/* Are we bypassing the PLL, or not? */
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static bool bypass = false;
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/*
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* Clock setup:
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* Take the main crystal oscillator at 16MHz, run it through the PLL, and divide
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* the 400MHz PLL clock to get a system clock of 80MHz.
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*/
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static void clock_setup(void)
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{
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rcc_sysclk_config(OSCSRC_MOSC, XTAL_16M, PLL_DIV_80MHZ);
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}
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/*
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* GPIO setup:
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* Enable the pins driving the RGB LED as outputs.
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*/
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static void gpio_setup(void)
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{
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/*
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* Configure GPIOF
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* This port is used to control the RGB LED
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*/
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periph_clock_enable(RCC_GPIOF);
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const u32 outpins = (LED_R | LED_G | LED_B);
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GPIO_DIR(RGB_PORT) |= outpins; /* Configure outputs. */
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GPIO_DEN(RGB_PORT) |= outpins; /* Enable digital function on outputs. */
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/*
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* Now take care of our buttons
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*/
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const u32 btnpins = USR_SW1 | USR_SW2;
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/*
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* PF0 is locked by default. We need to unlock the GPIO_CR register,
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* then enable PF0 commit. After we do this, we can setup PF0. If we
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* don't do this, any configuration done to PF0 is lost, and we will not
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* have a PF0 interrupt.
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*/
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GPIO_LOCK(GPIOF) = 0x4C4F434B;
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GPIO_CR(GPIOF) |= USR_SW2;
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/* Configure pins as inputs. */
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GPIO_DIR(GPIOF) &= ~btnpins;
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/* Enable digital function on the pins. */
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GPIO_DEN(GPIOF) |= btnpins;
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/* Pull-up the pins. We don't have an external pull-up */
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GPIO_PUR(GPIOF) |= btnpins;
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}
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/*
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* IRQ setup:
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* Trigger an interrupt whenever a button is depressed.
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*/
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static void irq_setup(void)
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{
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const u32 btnpins = USR_SW1 | USR_SW2;
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/* Configure interrupt as edge-sensitive */
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GPIO_IS(GPIOF) &= ~btnpins;
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/* Interrupt only respond to rising or falling edge (single-edge) */
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GPIO_IBE(GPIOF) &= ~btnpins;
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/* Trigger interrupt on rising-edge (when button is depressed) */
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GPIO_IEV(GPIOF) |= btnpins;
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/* Finally, Enable interrupt */
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GPIO_IM(GPIOF) |= btnpins;
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/* Enable the interrupt in the NVIC as well */
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nvic_enable_irq(NVIC_GPIOF_IRQ);
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}
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#define FLASH_DELAY 800000
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static void delay(void)
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{
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int i;
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for (i = 0; i < FLASH_DELAY; i++) /* Wait a bit. */
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__asm__("nop");
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}
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int main(void)
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{
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clock_setup();
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gpio_setup();
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irq_setup();
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/* Blink each color of the RGB LED in order. */
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while (1) {
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/*
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* Flash the Red diode
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*/
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gpio_set(RGB_PORT, LED_R);
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delay(); /* Wait a bit. */
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gpio_clear(RGB_PORT, LED_R);
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delay(); /* Wait a bit. */
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/*
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* Flash the Green diode
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*/
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gpio_set(RGB_PORT, LED_G);
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delay(); /* Wait a bit. */
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gpio_clear(RGB_PORT, LED_G);
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delay(); /* Wait a bit. */
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/*
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* Flash the Blue diode
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*/
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gpio_set(RGB_PORT, LED_B);
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delay(); /* Wait a bit. */
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gpio_clear(RGB_PORT, LED_B);
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delay(); /* Wait a bit. */
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}
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return 0;
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}
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void gpiof_isr(void)
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{
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if (GPIO_RIS(GPIOF) & USR_SW1) {
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/* SW1 was just depressed */
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bypass = !bypass;
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if (bypass) {
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rcc_pll_bypass_enable();
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/*
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* The divisor is still applied to the raw clock.
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* Disable the divisor, or we'll divide the raw clock.
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*/
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SYSCTL_RCC &= ~SYSCTL_RCC_USESYSDIV;
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}
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else
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{
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rcc_change_pll_divisor(plldiv[ipll]);
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}
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/* Clear interrupt source */
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GPIO_ICR(GPIOF) = USR_SW1;
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}
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if (GPIO_RIS(GPIOF) & USR_SW2) {
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/* SW2 was just depressed */
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if (!bypass) {
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if (plldiv[++ipll] == 0)
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ipll = 0;
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rcc_change_pll_divisor(plldiv[ipll]);
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}
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/* Clear interrupt source */
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GPIO_ICR(GPIOF) = USR_SW2;
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}
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}
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Block a user