I'm starting over.
This is a bare-minimum memory editor which fits entirely within the 256-byte boot sector of the Raspberry Pi Pico's on-board flash. Most of the space is dedicated to setting up the clocks, GPIO, and UART.
To use, enter a series of octal halfwords over UART then press G to jump to the beginning of SRAM and begin executing them as instructions. This is the first step in bootstrapping the whole system.
A more robust and user-friendly memory editor, which uses hexadecimal instead of octal, validates input characters, and displays the address and contents of the halfword currently being edited.
The machine code for this editor can be keyed in using octedit as a series of 16-bit octal halfwords.
This is a single-pass assembler supporting most of the ARMv6-M instruction set using a simplified instruction syntax in which there are no labels, only octal literals, and unambiguous instruction mnemonics.
It does not allow the user to type invalid instructions.
Goals:
- A subset of GNU
assyntax - Reasonably extensible
- Small code size
A LISP interpreter for the Raspberry Pi Pico.