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‎.gitignore

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*.[oa]
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.*.d
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*~
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*.ld
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*.elf
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*.bin
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*.hex
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*.orig
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*.rej
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kswitch_v2*

‎COPYING

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This is free and unencumbered software released into the public domain.
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Anyone is free to copy, modify, publish, use, compile, sell, or
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distribute this software, either in source code form or as a compiled
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binary, for any purpose, commercial or non-commercial, and by any
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means.
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In jurisdictions that recognize copyright laws, the author or authors
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of this software dedicate any and all copyright interest in the
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software to the public domain. We make this dedication for the benefit
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of the public at large and to the detriment of our heirs and
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successors. We intend this dedication to be an overt act of
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relinquishment in perpetuity of all present and future rights to this
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software under copyright law.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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OTHER DEALINGS IN THE SOFTWARE.
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For more information, please refer to <http://unlicense.org/>

‎Makefile

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export FW_VER := 0.1a
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PROJ = FF_OSD
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VER := v$(FW_VER)
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SUBDIRS += src
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.PHONY: all clean dist flash start serial
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ifneq ($(RULES_MK),y)
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export ROOT := $(CURDIR)
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all:
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$(MAKE) -C src -f $(ROOT)/Rules.mk $(PROJ).elf $(PROJ).bin $(PROJ).hex
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clean:
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rm -rf $(PROJ)-$(VER)*
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$(MAKE) -f $(ROOT)/Rules.mk $@
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dist: all
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rm -rf $(PROJ)-$(VER)*
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mkdir -p $(PROJ)-$(VER)
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cp -a src/$(PROJ).elf $(PROJ)-$(VER)
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cp -a src/$(PROJ).bin $(PROJ)-$(VER)
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cp -a src/$(PROJ).hex $(PROJ)-$(VER)
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zip -r $(PROJ)-$(VER) $(PROJ)-$(VER)
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rm -rf $(PROJ)-$(VER)
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endif
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BAUD=921600
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flash: all
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sudo ~/stm32flash/stm32flash -b $(BAUD) \
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-vw src/$(PROJ).hex /dev/ttyUSB0
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start:
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sudo ~/stm32flash/stm32flash -b $(BAUD) -g 0 /dev/ttyUSB0
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serial:
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sudo miniterm.py /dev/ttyUSB0 115200

‎README.md

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# FF_OSD: On Screen Display for FlashFloppy
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An On Screen Display (OSD) which emulates the popular LCD I2C interface.
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Hence it can be connected to a range of hardware which targets this type
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of LCD display.
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Most specifically: [FlashFloppy][FF]!
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## Download
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- [**Download FF_OSD**][Downloads]
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## Documentation
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- [**Read the GitHub Wiki**](https://github.com/keirf/FF_OSD/wiki)
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## Redistribution
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FF_OSD source code, and all binary releases, are freely redistributable
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in any form. Please see the [license](COPYING).
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[FF]: https://github.com/keirf/FlashFloppy/wiki
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[Downloads]: https://github.com/keirf/FF_OSD/wiki/Downloads

‎Rules.mk

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TOOL_PREFIX = arm-none-eabi-
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CC = $(TOOL_PREFIX)gcc
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OBJCOPY = $(TOOL_PREFIX)objcopy
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LD = $(TOOL_PREFIX)ld
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ifneq ($(VERBOSE),1)
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TOOL_PREFIX := @$(TOOL_PREFIX)
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endif
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FLAGS = -g -Os -nostdlib -std=gnu99 -iquote $(ROOT)/inc
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FLAGS += -Wall -Werror -Wno-format -Wdeclaration-after-statement
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FLAGS += -Wstrict-prototypes -Wredundant-decls -Wnested-externs
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FLAGS += -fno-common -fno-exceptions -fno-strict-aliasing
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FLAGS += -mlittle-endian -mthumb -mcpu=cortex-m3 -mfloat-abi=soft
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FLAGS += -MMD -MF .$(@F).d
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DEPS = .*.d
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CFLAGS += $(FLAGS) -include decls.h
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AFLAGS += $(FLAGS) -D__ASSEMBLY__
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LDFLAGS += $(FLAGS) -Wl,--gc-sections
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RULES_MK := y
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include Makefile
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OBJS += $(patsubst %,%/build.o,$(SUBDIRS))
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# Force execution of pattern rules (for which PHONY cannot be directly used).
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.PHONY: FORCE
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FORCE:
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.PHONY: clean
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.SECONDARY:
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build.o: $(OBJS)
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$(LD) -r -o $@ $^
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%/build.o: FORCE
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$(MAKE) -f $(ROOT)/Rules.mk -C $* build.o
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%.o: %.c Makefile
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@echo CC $@
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$(CC) $(CFLAGS) -c $< -o $@
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%.o: %.S Makefile
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@echo AS $@
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$(CC) $(AFLAGS) -c $< -o $@
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%.ld: %.ld.S Makefile
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@echo CPP $@
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$(CC) -P -E $(AFLAGS) $< -o $@
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%.elf: $(OBJS) %.ld Makefile
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@echo LD $@
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$(CC) $(LDFLAGS) -T$(*F).ld $(OBJS) -o $@
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%.hex: %.elf
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@echo OBJCOPY $@
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$(OBJCOPY) -O ihex $< $@
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%.bin: %.elf
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@echo OBJCOPY $@
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$(OBJCOPY) -O binary $< $@
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clean:: $(addprefix _clean_,$(SUBDIRS))
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rm -f *~ *.o *.elf *.hex *.bin *.ld $(DEPS)
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_clean_%: FORCE
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$(MAKE) -f $(ROOT)/Rules.mk -C $* clean
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-include $(DEPS)

‎inc/cancellation.h

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/*
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* cancellation.h
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*
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* Asynchronously-cancellable function calls.
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*
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* Written & released by Keir Fraser <[email protected]>
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*
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* This is free and unencumbered software released into the public domain.
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* See the file COPYING for more details, or visit <http://unlicense.org>.
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*/
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struct cancellation {
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uint32_t *sp;
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};
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#define cancellation_is_active(c) ((c)->sp != NULL)
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/* Execute fn() in a wrapped cancellable environment. */
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int call_cancellable_fn(struct cancellation *c, int (*fn)(void *), void *arg);
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/* From IRQ content: stop running fn() and immediately return -1. */
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void cancel_call(struct cancellation *c);
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/*
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* Local variables:
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* mode: C
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* c-file-style: "Linux"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/

‎inc/decls.h

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/*
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* decls.h
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*
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* Pull in all other header files in an orderly fashion. Source files include
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* only this header, and only once.
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*
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* Written & released by Keir Fraser <[email protected]>
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*
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* This is free and unencumbered software released into the public domain.
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* See the file COPYING for more details, or visit <http://unlicense.org>.
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*/
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#include <stdint.h>
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#include <stdarg.h>
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#include <stddef.h>
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#include "util.h"
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#include "stm32f10x_regs.h"
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#include "stm32f10x.h"
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#include "intrinsics.h"
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#include "cancellation.h"
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#include "time.h"
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#include "timer.h"
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/*
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* Local variables:
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* mode: C
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* c-file-style: "Linux"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/

‎inc/intrinsics.h

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/*
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* intrinsics.h
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*
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* Compiler intrinsics for ARMv7-M core.
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*
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* Written & released by Keir Fraser <[email protected]>
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*
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* This is free and unencumbered software released into the public domain.
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* See the file COPYING for more details, or visit <http://unlicense.org>.
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*/
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struct exception_frame {
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uint32_t r0, r1, r2, r3, r12, lr, pc, psr;
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};
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#define _STR(x) #x
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#define STR(x) _STR(x)
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/* Force a compilation error if condition is true */
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#define BUILD_BUG_ON(cond) ({ _Static_assert(!(cond), "!(" #cond ")"); })
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#define __aligned(x) __attribute__((aligned(x)))
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#define __packed __attribute((packed))
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#define always_inline __inline__ __attribute__((always_inline))
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#define noinline __attribute__((noinline))
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#define likely(x) __builtin_expect(!!(x),1)
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#define unlikely(x) __builtin_expect(!!(x),0)
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#define illegal() asm volatile (".short 0xde00");
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#define barrier() asm volatile ("" ::: "memory")
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#define cpu_sync() asm volatile("dsb; isb" ::: "memory")
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#define cpu_relax() asm volatile ("nop" ::: "memory")
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#define cpu_wfi() asm volatile ("dsb; wfi" ::: "memory")
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#define sv_call(imm) asm volatile ( "svc %0" : : "i" (imm) )
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#define read_special(reg) ({ \
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uint32_t __x; \
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asm volatile ("mrs %0,"#reg : "=r" (__x) ::); \
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__x; \
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})
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#define write_special(reg,val) ({ \
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uint32_t __x = (uint32_t)(val); \
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asm volatile ("msr "#reg",%0" :: "r" (__x) :); \
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})
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/* CONTROL[1] == 0 => running on Master Stack (Exception Handler mode). */
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#define CONTROL_SPSEL 2
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#define in_exception() (!(read_special(control) & CONTROL_SPSEL))
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#define global_disable_exceptions() \
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asm volatile ("cpsid f; cpsid i" ::: "memory")
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#define global_enable_exceptions() \
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asm volatile ("cpsie f; cpsie i" ::: "memory")
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/* NB. IRQ disable via CPSID/MSR is self-synchronising. No barrier needed. */
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#define IRQ_global_disable() asm volatile ("cpsid i" ::: "memory")
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#define IRQ_global_enable() asm volatile ("cpsie i" ::: "memory")
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/* Save/restore IRQ priority levels.
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* NB. IRQ disable via MSR is self-synchronising. I have confirmed this on
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* Cortex-M3: any pending IRQs are handled before they are disabled by
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* a BASEPRI update. Hence no barrier is needed here. */
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#define IRQ_save(newpri) ({ \
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uint8_t __newpri = (newpri)<<4; \
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uint8_t __oldpri = read_special(basepri); \
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if (!__oldpri || (__oldpri > __newpri)) \
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write_special(basepri, __newpri); \
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__oldpri; })
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/* NB. Same as CPSIE, any pending IRQ enabled by this BASEPRI update may
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* execute a couple of instructions after the MSR instruction. This has been
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* confirmed on Cortex-M3. */
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#define IRQ_restore(oldpri) write_special(basepri, (oldpri))
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static inline uint16_t _rev16(uint16_t x)
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{
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uint16_t result;
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asm volatile ("rev16 %0,%1" : "=r" (result) : "r" (x));
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return result;
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}
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static inline uint32_t _rev32(uint32_t x)
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{
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uint32_t result;
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asm volatile ("rev %0,%1" : "=r" (result) : "r" (x));
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return result;
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}
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static inline uint32_t _rbit32(uint32_t x)
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{
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uint32_t result;
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asm volatile ("rbit %0,%1" : "=r" (result) : "r" (x));
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return result;
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}
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/*
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* Local variables:
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* mode: C
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* c-file-style: "Linux"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/

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