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https://github.com/wa1tnr/camelforth-rp2350-a-ms-u

CamelForth for RP2350 - port of existing RP2040 verion - Dr Brad Rodriguez upstream
https://github.com/wa1tnr/camelforth-rp2350-a-ms-u

assembly c camelforth forth interpreter rp2350

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CamelForth for RP2350 - port of existing RP2040 verion - Dr Brad Rodriguez upstream

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# camelforth-rp2040-b-MS-U   UNSTABLE   0.1.7-pre-alpha   Wed Apr 14 14:43:13 UTC 2021



#### Sat  9 Nov 21:37:16 UTC 2024

#### templated for rp2030 - non-working version 9 Nov 21:37z



CamelForth in C, by Dr. Brad Rodriguez



UNSTABLE version - with mass storage support QSPI flashROM



NEOPIX support added (pio) 11 May.

Feather target configured for that. Edit source for others.



Stores forth source code in QSPI flash, and plays it

back during COLD (player piano).



# NEWS

## 4 November 2022 - inquiry received



> Begin forwarded message:



> Date: Mon, 14 Nov 2022 15:03:24 +0000 



> From: D.V. 



> Subject: [CamelForth] Camelforth for Pico 



>> Wondering whether the implementor will continue to develop the Pico implementation and/or 'entertain' questions about the implementation.



>> I didn't see any contact information on this site or the 'github' material.  Thank you!



The one open [issue](https://github.com/wa1tnr/camelforth-rp2040-b-MS-U/issues/2) already invites contact through the issue mechanism.



Work is only done on this repository when a specific operational

difficulty arises, such as an update to pico-sdk that changes

how (or if) the program continues to compile correctly.



Not noticed ordinarily, as the project is essentially mothballed.



In its current state it should be able to read and write to

on-board (external, QSPI) flashROM 'raw'.  This amounts to a

player piano situation; it plays back the Forth source code

(in ascii representation, as with any ascii plaintext file)

.. upon a cold boot.



Which, in turn, amounts to an extended Forth dictionary.



## 14 April 2021 - three targets supported.



RPi Pico RP2040, Adafruit Feather and ItsyBitsy RP2040

(three targets) all supported.



Use a different shell script to build each.



see pico-examples/build for those scripts.



Added brief documentation (see immediately, below!)



# BRIEF DOCO



The program will stores your Forth source code, in

QSPI flash.



It will then play it back, during COLD (player piano).



There is a new 'flaccept' (flash accept) word/thread

that does the play-back during COLD; 'rewind' is used

to reset the pointer to the flashROM address where

flaccept (& friends) reads in the simulated keystrokes.



'rewind' word controls what happens the next time COLD

is called.  'rewind' allows the source to be read back

into the interpreter; failure to use 'rewind' leaves

the generic camelforth kernel, only, without the update

to the forth dictionary provided by this mechanism.



'reflash' simply starts the target such that the USB

mass storage is visible to the host PC.



'reading' accepts ascii upload of forth source code;

terminate with ESC (press it after the upload, the

interpreter will see your keypress of ESC and stop

the upload, and mark the buffer termination).



Max size supported is 4096 bytes (leave off a few

bytes for proper termination of the buffer).



Short uploads are not detected - press ESC as

detailed, above.



'reading' puts out its own address onto TOS.



'buf2flash' takes that address and uses it to find

what you've just ascii-uploaded (into SRAM).



It writes that block of SRAM into QSPI flashROM.



Nominally, at 0x10040000 per the SDK example program.



'erase' takes an address and erases the QSPI flashROM

at that address.  Should be a multiple of 0x1000 as

that's the size erased.



# OLDER



 new feature: no-error getKey()



     improved: rp2040_pico_getkey_usb.inc



Reasonably well debugged - functional Forth interpreter.



There was one bug where it crashes unexpectedly, after

a decently long runtime.  'getchar()' in the upstream

pico-sdk now has a bug report filed.



Port: rp2040, Raspberry Pi Pico target board, February, 2021.



older entries in this README.md, follows (from prior to 17 Feb Wed 16:29 UTC).



# PARENT was camelforth-rp2040-a    0.1.1-pre-alpha   Tue Feb 9 05:28:31 UTC 2021



commit 6cd03e97f38784f3f7fe8baf68416657af9469a7



    CamelForth in C by Brad Rodriguez



# About



CamelForth



A Forth in C by Dr Brad Rodriguez



Forth interpreter for the

RP2040 and Raspberry Pi Pico.



UNSTABLE version.  Look for changes and improvements here.



New feature: the blink word.  Use once per blink.



Requires pico-sdk and is modeled on pico-examples.



The /dev/ttyACM0 is the primary interface (USB).



(Reference host PC is Linux Debian amd64)



Using CP2104 USB-to-USART bridge, the secondary

interface (in Linux host PC) is /dev/ttyUSB0, but

that is arbitrary (you can bridge using other

methods and chips).



Connected to UART0 on the pico.



# Topics



# camelforth

# rp2040

# raspberry-pi-pico



# rpi-pico-pio



# forth

# c



## old branches:



BUILD ENVIRONMENT - bare bones text interpreter



no Forth functionality at all - not even base code.



Just keyboard echo loop.



END.