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Bare metal emulators and launcher for retroflag GPI v1

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# gpiemu
Bare metal emulators and launcher for retroflag GPI v1

Bare metal environment provided by the circle-stdlib project.

https://github.com/smuehlst/circle-stdlib

## GPi Case Configuration

Your GPi Case must be in "Hat" input mode for correct operation.

If you're not able to navigate menus, set the input mode by holding **Up** on the D-Pad and **Select** for around five seconds, until the power LED flashes purple. Depending on your exact model of GPi Case, you may need to hold **Up** and **Start** instead.

## Build Instructions

1st follow setup instructions for circle-stdlib, see https://github.com/smuehlst/circle-stdlib 
 
You should now have a toolchain and circle-stdlib installed. 
 
Generate environment variables below, these are used by the makefiles in the various projects.
Alter the values to match your local installation of circle-stdlib and the toolchain
 
export CIRCLE_STDLIB=/home/dave/Documents/projects/circle-stdlib 
export CIRCLE_TOOLCHAIN=/home/dave/Toolchain/arm-gnu-toolchain-12.2.rel1-x86_64-arm-none-eabi 
 
Need to configure Circle lib, we need to enable some additional settings. 
Update the following file 
$(CIRCLE_STDLIB)/libs/circle/include/circle/sysconfig.h 
 
Need to increase max kernel size otherwise NES emulator will halt on startup 
#define KERNEL_MAX_SIZE		(3 * MEGABYTE) 
 
uncomment the following defines to enable PWM sound on the pi zero 
 
USE_PWM_AUDIO_ON_ZERO 
USE_GPIO18_FOR_LEFT_PWM_ON_ZERO 
USE_GPIO19_FOR_RIGHT_PWM_ON_ZERO 
 
and add a define for NO_USB_SOF_INTR - reduces USB overhead 
#define NO_USB_SOF_INTR 
 
Need to patch the libgloss io code to support file type properties in dirent.h. 
Need to patch some of the USB code as well as circle struggles to init the USB fully. 
 
See circle-patches folders 
copy files to correct location 
$(CIRCLE_STDLIB)/libs/circle-newlib/libgloss/circle/io.cpp 
$(CIRCLE_STDLIB)/libs/circle-newlib/newlib/libc/sys/circle/sys/dirent.h 
$(CIRCLE_STDLIB)/libs/circle/lib/usb/dwhcidevice.cpp 
$(CIRCLE_STDLIB)/libs/circle/lib/usb/usbdevice.cpp 
 
You should clean and rebuild circle-stdlib after this change 
ie 
make clean 
make 
 
Delete assert.h - causes conflicts, doesn't appear to be required..not in my code anyway. 
$(CIRCLE_STDLIB)/install/arm-none-circle/include/assert.h 
 
$(GPIEMU) = where ever you extracted the gpiemu repo to on your machine 
 
Build Zlib 
 cd $(GPIEMU)/zlib123 
 make -f makefile.gpi clean 
 make -f makefile.gpi 
 make -f makefile.gpi install 
 
Build libpng 
 cd $(GPIEMU)/lpng1626 
 make -f makefile.gpi clean 
 make -f makefile.gpi 
 make -f makefile.gpi install 
 
Build GB emulator 
 cd $(GPIEMU)/DingooGB 
 make -f makefile.gpi.gb clean 
 make -f makefile.gpi.gb 
 
Build GBC emulator 
 cd $(GPIEMU)/DingooGB 
 make -f makefile.gpi.gbc clean 
 make -f makefile.gpi.gbc 
 
Build NES emulator 
 cd $(GPIEMU)/DingooNES 
 make -f makefile.gpi clean 
 make -f makefile.gpi

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