for anyone who might find this useful

[danielditlev]

These are the files that I have had to fetch to make it build and the order needed to make it run.

echo "Setting up the aarch64 compiler"
wget https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-aarch64-aarch64-none-elf.tar.xz
tar -xvf gcc-arm-10.3-2021.07-aarch64-aarch64-none-elf.tar.xz
export PATH="$PWD/gcc-arm-10.3-2021.07-aarch64-aarch64-none-elf/bin/:$PATH"

echo "Fetching the december 2021 circle-stdlib version"
wget https://github.com/smuehlst/circle-stdlib/archive/refs/tags/v15.10.tar.gz
tar -xvf v15.10.tar.gz 
mv circle-stdlib-15.10 circle-stdlib

echo "Fetching the december 2021 circle-newlib version"
wget https://github.com/smuehlst/circle-newlib/archive/6fe4bb7350b47e199093f5460226dec53506ccaf.tar.gz
tar -xvf 6fe4bb7350b47e199093f5460226dec53506ccaf.tar.gz
mv circle-newlib-6fe4bb7350b47e199093f5460226dec53506ccaf circle-newlib
mv circle-newlib circle-stdlib/libs/

echo "Fetching the december 2021 circle version"
wget https://github.com/rsta2/circle/archive/refs/tags/Step44.3.tar.gz
tar -xvf Step44.3.tar.gz
mv circle-Step44.3 circle
mv circle circle-stdlib/libs/

cd circle-stdlib/

echo "making backups of the org Rules.mk and sysconfig.h files in the circle lib"
cd libs
mv circle/Rules.mk circle/Rules.org.mk
mv circle/include/circle/sysconfig.h circle/include/circle/sysconfig.org.h
cd ../

echo "Fecthing RAD to get the right Rules.mk and sysconfig.h for the circle lib"
git clone https://github.com/frntc/RAD.git
cp RAD/Source/Firmware/Circle/Rules.mk libs/circle/
cp RAD/Source/Firmware/Circle/sysconfig.h libs/circle/include/circle/sysconfig.h

./configure -r 3 -p aarch64-none-elf-

make all
make newlib

echo "Fecthing RAD-Doom which is why we are here"
git clone https://github.com/frntc/RAD-Doom.git

cd RAD-Doom/Source/

echo "renaming 'Doom' -> 'doom' as it was needed in one of my dockers. if not needed it is just ignored"
mv Doom doom

make clean
make

Not sure what versions of the libs and compiler was originally used but I think these versions are the right ones based on the comments in circle Step44.3 which was mentioned in the RAD repository.

[danielditlev]

Got the Unit today \o/ . Doom runs like a dream and the sound was way better than I had expected it. Been looking through the code and it is beautiful ! ( updated the above script to make it actually run on the device )

[danielditlev]

Awesome project you have made! My big hands couldn't play in keyboard mode for more than a few minutes before they gave up so I have added joystick support to it, which gave me a chance better understand what/why you did when you set the DDR register and also learn why you had to SPEEK twice afterwards to be sure to read the correct values. I don't understand why you set the MSB during your mouse reading but I am sure there must be a reason.

	SPEEK( 0xdc00, tmp00 );
	tmp00 = ( tmp00 & 0b00111111 ) | 0b10000000;
	SPOKE( 0xdc00, tmp00 );

I will probably make a PR but for anyone interested these a the bits and pieces needed for the joystick support

in doom_generic_rad.c

extern void blitScreenDOOM( uint8_t *koalaData, uint32_t *kbEvents, uint8_t *nEvents, uint8_t *mouseData, uint8_t *joyData, uint32_t *mouseControlActive );

	uint8_t joyData[ 5 ];
	blitScreenDOOM( koalaData,  kbEvents, &nEvents, mouseData, joyData, &mouseControlActive );

#define NUM_JOY_KEYS 5
const unsigned char VK_CODES_JOY[NUM_JOY_KEYS] = { VK_UP, VK_DOWN, VK_LEFT, VK_RIGHT, VK_COMMODORE };
uint8_t joyDataPrev[ NUM_JOY_KEYS ] = { 0,0,0,0,0 };

	uint8_t joyData[ 5 ];
	blitScreenDOOM( koalaData, kbEvents, &nEvents, mouseData, joyData, &mouseControlActive );

	if (!mouseControlActive) {
		// Process joystick input by converting joystick state to key presses
		for (int i = 0; i < NUM_JOY_KEYS; ++i) {
			if (joyData[i] == 1 && joyDataPrev[i] == 0) {
				addKeyToQueue(1, VK_CODES_JOY[i]); // key down
			} else if (joyData[i] == 0 && joyDataPrev[i] == 1) {
				addKeyToQueue(0, VK_CODES_JOY[i]); // key up
			}
		}

		// Update previous joystick data
		memcpy(joyDataPrev, joyData, NUM_JOY_KEYS);		
	} else {
		// todo: activate mouse by pressing button
		handleMouseUpdate( mouseData );
	}

In rad_doom_hijack.cpp

extern "C" void blitScreenDOOM( unsigned char *koalaData, unsigned int *kbEvents, unsigned char *nEvents, unsigned char *mouseData, unsigned char *joyData, int *mouseControlActive )

void readJoystick(unsigned char *joyData) {
	unsigned char joyState;

	// Update the DDR to let the CIA know we want to read the joystick
	SPOKE(0xdc02, 0xe0);

	// It takes 2 syncs to be SURE that the register is updated after setting the DDR ( https://www.c64-wiki.com/wiki/Paddle )
	SPEEK(0xdc00, joyState);
	SPEEK(0xdc00, joyState);

	// Invert `joyState` since an activation is represented by a 0
	joyState = ~joyState;

	// Directly assign button states to joyData elements using bitwise AND and logical shift right operations.
	for (int i = 0; i < 5; ++i) {
		joyData[i] = (joyState >> i) & 1;
	}
}

	// Read joydata if needed
	if (!(*mouseControlActive)) readJoystick( joyData );