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Hello UART (serial)

An original public-domain (CC0) program, hand-authored in Xtensa LX6 assembly. It brings up UART0 (0x3FF40000), prints a banner, makes one windowed subroutine call (CALL4 -> ENTRY -> RETW.N, which visibly rotates WINDOWBASE in the debugger), 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 ESP32 flash image (Xtensa LX6), base64  ·  By: emulators.org  ·  Licence: Public domain (CC0)