The minimum operating system for avr microcontroller AVRX, all the assembly code is written in the code only 1k bytes

avrx
....\avrx-ctoasm.inc
....\avrx-io.h
....\avrx-signal.h
....\avrx.a
....\avrx.h
....\avrx.inc
....\avrx.xlb
....\avrx_canceltimer.o
....\avrx_canceltimer.s
....\avrx_canceltimermessage.o
....\avrx_canceltimermessage.s
....\avrx_eeprom.o
....\avrx_eeprom.s
....\avrx_generatesinglestepinterrupt.o
....\avrx_generatesinglestepinterrupt.s
....\avrx_halt.o
....\avrx_halt.s
....\avrx_iar_vect.s
....\avrx_message.o
....\avrx_message.s
....\avrx_notes.txt
....\avrx_priority.o
....\avrx_priority.s
....\avrx_recvmessage.o
....\avrx_recvmessage.s
....\avrx_reschedule.s
....\avrx_resetsemaphore.o
....\avrx_resetsemaphore.s
....\avrx_semaphores.o
....\avrx_semaphores.s
....\avrx_singlestep.o
....\avrx_singlestep.s
....\avrx_starttimermessage.o
....\avrx_starttimermessage.s
....\avrx_suspend.o
....\avrx_suspend.s
....\avrx_tasking.o
....\avrx_tasking.s
....\avrx_terminate.o
....\avrx_terminate.s
....\avrx_testsemaphore.o
....\avrx_testsemaphore.s
....\avrx_timequeue.o
....\avrx_timequeue.s
....\io-avr.h
....\ioavr.h
....\makefile
....\monitor.o
....\monitor.s
....\README.txt
....\serialio.h
....\serialio.s
....\vssver.scc
makefile
ADCDrv.c
ButterflyOS.c
ForStack.c
LCDDrv.c
NumStack.c
ProgQueue.c
SerialioDrv.c
classfolders.dcf
ButterflyOS.dev
ButterflyOS.elf
ADCDrv.h
avrx.h
avrx-io.h
avrx-signal.h
ButterflyOS.h
ButterflyOS_private.h
ForStack.h
hardware.h
interrupt.h
io.h
LCDDrv.h
NumStack.h
ProgQueue.h
SerialioDrv.h
ButterflyOS.hex
ButterflyOS.layout
NumStack.layout
ADCDrv.lst
ButterflyOS.lst
ForStack.lst
LCDDrv.lst
ProgQueue.lst
SerialioDrv.lst
ButterflyOS.map
ADCDrv.o
ButterflyOS.o
ForStack.o
LCDDrv.o
ProgQueue.o
SerialioDrv.o
ButterflyOS.obj
ADCDrv.c.orig
ADCDrv.h.orig
ButterflyOS.c.orig
ButterflyOS.h.orig

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