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| author | user <user@clank> | 2026-07-17 01:28:23 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 01:28:23 +0200 |
| commit | b5544e84232b80351e7c58501c1632080a354d12 (patch) | |
| tree | a4087d5c9df0589b613bcb6696962825099ce8b7 /c/gbos.h | |
| parent | pipe: PIPE_MAX 2->4 (5-stage pipelines) + fix cross-yield byte corruption (diff) | |
| download | gbos-b5544e84232b80351e7c58501c1632080a354d12.tar.gz gbos-b5544e84232b80351e7c58501c1632080a354d12.tar.xz gbos-b5544e84232b80351e7c58501c1632080a354d12.zip | |
net: SLIP framing over the link port + a host gateway (echo round-trip)
First step of link-port networking. The LCD terminal + OSK freed the serial
port from console duty, so it can be the network link.
Kernel (src/net.asm): raw link-port serial that bypasses the console/
terminal - sys_ssend (transmit, GB drives the clock) and sys_srecv (receive,
GB slave, blocks by yielding). Syscalls 29/30.
Userland: libc ssend()/srecv(); c/necho.c does SLIP (RFC 1055) framing over
them - send a packet, receive the reply, print it.
Host: tools/gateway.py wraps the emulator, owns its link serial, speaks SLIP,
and (for now) echoes every frame back - the "link cable adapter". Console
(ASCII) bytes on the same channel are printed for visibility.
Verified: `necho` sends a SLIP frame, the gateway decodes+echoes it, and gbos
prints the reply - a real framed round-trip over the Game Boy link port.
Next: swap the echo for actual network ops (DNS/HTTP or IRC/chat).
Diffstat (limited to 'c/gbos.h')
| -rw-r--r-- | c/gbos.h | 2 |
1 files changed, 2 insertions, 0 deletions
@@ -13,6 +13,8 @@ char readc(void); /* one input byte, EOF at end */ void sexit(unsigned char code); unsigned char getpid(void); unsigned char pipe(void); /* -> read fd; write end is read+1 */ +void ssend(unsigned char b); /* link-port: transmit one byte */ +unsigned char srecv(void); /* link-port: receive one byte (blocks) */ /* helpers (c/libc.c) */ void putu(unsigned int n); /* print decimal */ |