Software › Hello UART (serial)

Hello UART (serial)

An original public-domain (CC0) program, hand-authored in Xtensa LX106 assembly (CALL0 ABI). It brings up UART0 (0x60000000), prints a banner, makes one nested CALL0 subroutine call (saving a0 on the stack — the LX106 has no register windows), then streams tick 0, tick 1, ... forever (decimal printing uses the Xtensa 32-bit multiply). On-board only: just UART0. Real Xtensa machine code, so every instruction single-steps in the debugger.

Download ↓ Original source ↗

Format: Raw ESP8266 flash image (Xtensa LX106), base64  ·  By: emulators.org  ·  Licence: Public domain (CC0)