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Server

worldwide contains an HTTP server, and the user can give various instructions to it through HTTP requests.

Start

Normal execution will not start the HTTP server. You can start the HTTP server by running it with the port option specified.

go run ./cmd -p 8888 ./PM_PRISM.gbc # start HTTP server on localhost:8888

Note: On this API server, GET method changes emulator's state!

Commands

pause

Pause emulator

curl localhost:8888/pause

continue

Continue emulator from pause state

curl localhost:8888/continue

reset

Reset emulator. Debug information(e.g. breakpoints, history-mode) is not reset.

curl localhost:8888/reset

quit

Quit emulator. Exitcode is 0 and savefile is written.

curl localhost:8888/quit

mute

Mute emulator(toggle)

curl localhost:8888/mute

Debug commands

debug/register(GET)

Get value from CPU-registers and other important registers

curl localhost:8888/debug/register
// application/json
{
    "A":"0x00", "F":"0xa0",
    "B":"0x00", "C":"0x00",
    "D":"0x00", "E":"0x04",
    "H":"0xff", "L":"0xfe",
    "PC":"0x4a10","SP":"0xc0f8",
    "IE":"0x0f", "IF":"0xe1", "IME":"0x01",
    "Halt":"true", "DoubleSpeed":"true"
}

debug/register(POST)

Set a value into register

# target: register's name (a, b, c, d, e, h, l, f, sp, pc, ime)
# value: hex value (e.g. 0x0486)
curl -X POST -d '{"target":"ime", "value":"0x1"}' -H "Content-Type: application/json" localhost:8888/debug/register

debug/break(POST)

Set a breakpoint

curl -X POST -d '{"addr":"0x0486"}' -H "Content-Type: application/json" localhost:8888/debug/break

debug/break(GET)

List breakpoints

curl localhost:8888/debug/break
[0x0486, 0x0490] # text/plain

debug/break(DELETE)

Delete a breakpoint

curl -X DELETE "localhost:8888/debug/break?addr=0x0486"

debug/read1

Read a byte from memory

curl "localhost:8888/debug/read1?addr=0x0150"
0x12 # text/plain

debug/read2

Read two bytes from memory

curl "localhost:8888/debug/read2?addr=0x0150"
0x1411 # text/plain

debug/history(POST)

Start recording the history of the executed instructions.

Specify how many past histories to record in the history parameter.(Max 100)

The larger the number, the greater the load on the emulator CPU.

curl -X POST -d '{"history":"0x20"}' -H "Content-Type: application/json" localhost:8888/debug/history

debug/history(GET)

Displays the history of records started by POST requests.

curl localhost:8888/debug/history
# text/plain
0x0048: JP a16
0xcda1: PUSH AF
0xcda2: PUSH HL
...
0x048a: JR NZ r8
0x0485: HALT
0x0486: LD A (a16)

debug/cartridge

Get cartridge info

curl localhost:8888/debug/cartridge
// application/json
{
    "title":"PM_PRISM",
    "cartridge_type":"MBC3+TIMER+RAM+BATTERY",
    "rom_size":"2MB",
    "ram_size":"32KB"
}

debug/disasm

Disassemble instructions

curl localhost:8888/debug/disasm
// application/json
{
    "pc":"0x0486",
    "mnemonic":"LD A (a16)"
}

debug/trace

Trace a number of instructions

curl "localhost:8888/debug/trace?step=20" # trace 20 instructions
# text/plain
0x16cf: INC L
0x16d0: LD (HL) D
0x16d1: INC L
0x16d2: POP DE
0x16d3: LD (HL) E
...
0x16dd: LD (HL) E
0x16de: INC L
0x16df: LD (HL) D
0x16e0: INC L
0x16e1: POP DE
0x16e2: LD (HL) E

debug/io(Websocket)

Get IO registers(0xff00-0xffff) at 100-milisecond intervals using Websocket.

IO registers is sent in arraybuffer. Please refer to io.html for how to display it.

wscat -c ws://localhost:8888/debug/io

debug/tileview/bank0(Websocket)

Get tile data at 100-milisecond intervals using Websocket.

Tile data is sent in binary format. Please refer to tileview.html for how to display it.

wscat -c ws://localhost:8888/debug/tileview/bank0 # or ws://localhost:8888/debug/tileview/bank1

debug/sprview(Websocket)

Get sprite data at 100-milisecond intervals using Websocket.

Sprite data is sent in binary format. Please refer to sprview.html for how to display it.

wscat -c ws://localhost:8888/debug/sprview