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https://github.com/BleuLlama/TinyBasicPlus

A C implementation of Tiny Basic, with a focus on support for Arduino
https://github.com/BleuLlama/TinyBasicPlus

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A C implementation of Tiny Basic, with a focus on support for Arduino

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README 

        
TinyBasic Plus

==============



A C implementation of Tiny Basic, with a focus on support for

Arduino.  It was originally written by Gordon Brandly in the form

of "68000 Tiny Basic", and then ported to C by Michael Field as

"Arduino Basic", though still called "Tiny Basic" in the source

files.



TinyBasic Plus is an extension and modification upon the original

"Tiny Basic" by adding support for a few more devices, configurable

at build time.  It is designed for use on the Arduino, although

builds will soon be easily possible for other platforms through

command line makefiles.  Provided is a makefile that builds for 

unix-ey type OSes.  It has only been tested for Darwin (OS X).



Features added include support for fileio (SD Library), autorunning

a program from the SD card, smaller footprint (PROGMEM), support

for pin data IO, and support for the on-chip EEProm storage for your

program. 



# Full list of supported statements and functions



## System

- BYE		- *exits Basic, soft reboot on Arduino*

- END 		- *stops execution from the program, also "STOP"*

- MEM		- *displays memory usage statistics*

- NEW		- *clears the current program*

- RUN		- *executes the current program*



## File IO/SD Card

- FILES		- 	*lists the files on the SD card*

- LOAD filename.bas	- *loads a file from the SD card*

- CHAIN filename.bas - *equivalent of: new, load filename.bas, run*

- SAVE filename.bas	- *saves the current program to the SD card, overwriting*



## EEProm - nonvolatile on-chip storage

- EFORMAT	- clears the EEProm memory

- ELOAD		- load the program in from EEProm

- ESAVE		- save the current program to the EEProm

- ELIST		- print out the contents of EEProm

- ECHAIN	- load the program from EEProm and run it



## IO, Documentation

- INPUT variable	- *let the user input an expression (number or variable name*

- PEEK( address )	- *get a value in memory* (unimplemented)

- POKE address		- *set a value in memory* (unimplemented)

- PRINT expression	- *print out the expression, also "?"*

- REM stuff		- *remark/comment, also "'"*



## Expressions, Math

- A=V, LET A=V	- *assign value to a variable*

- +, -, \*, / - *Math*

- <,<=,=,<>,!=,>=,> - *Comparisons*

- ABS( expression )  - *returns the absolute value of the expression*

- RSEED( v ) - *sets the random seed to v*

- RND( m ) - *returns a random number from 0 to m*



## Control

- IF expression statement - *perform statement if expression is true*

- FOR variable = start TO end	- *start for block*

- FOR variable = start TO end STEP value - *start for block with step*

- NEXT - *end of for block*

- GOTO linenumber - *continue execution at this line number*

- GOSUB linenumber - *call a subroutine at this line number*

- RETURN	- *return from a subroutine*



## Pin IO 

- DELAY	timems*- wait (in milliseconds)*

- DWRITE pin,value - *set pin with a value (HIGH,HI,LOW,LO)*

- AWRITE pin,value - *set pin with analog value (pwm) 0..255*

- DREAD( pin ) - *get the value of the pin* 

- AREAD( analogPin ) - *get the value of the analog pin*



NOTE: "PINMODE" command removed as of version 0.11



## Sound - Piezo wired with red/+ on pin 5 and black/- to ground

- TONE freq,timems - play "freq" for "timems" milleseconds (1000 = 1 second)

- TONEW freq,timems - same as above, but also waits for it to finish

- NOTONE - stop playback of all playing tones



NOTE: TONE commands are by default disabled



# Example programs



Here are a few example programs to get you started...



## User Input



Let a user enter a new value for a variable, enter a number like '33' or '42',

or a varaible like 'b'.



	10 A=0

	15 B=999

	20 PRINT "A is ", A

	30 PRINT "Enter a new value ";

	40 INPUT A

	50 PRINT "A is now ", A



## Blink



hook up an LED between pin 3 and ground



	10 FOR A=0 TO 10

	20 DWRITE 3, HIGH

	30 DELAY 250

	40 DWRITE 3, LOW

	50 DELAY 250

	60 NEXT A



## Fade



hook up an LED between pin 3 and ground



	10 FOR A=0 TO 10

	20 FOR B=0 TO 255

	30 AWRITE 3, B

	40 DELAY 10

	50 NEXT B

	60 FOR B=255 TO 0 STEP -1

	70 AWRITE 3, B

	80 DELAY 10

	90 NEXT B

	100 NEXT A



## LED KNOB



hook up a potentiometeter between analog 2 and ground, led from digital 3 and ground.  If knob is at 0, it stops



	10 A = AREAD( 2 )

	20 PRINT A

	30 B = A / 4

	40 AWRITE 3, B

	50 IF A == 0 GOTO 100

	60 GOTO 10

	100 PRINT "Done."



## ECHAIN example



Write a small program, store it in EEPROM.  We'll show that variables don't

get erased when chaining happens



	EFORMAT

	10 A = A + 2

	20 PRINT A

	30 PRINT "From eeprom!"

	40 IF A = 12 GOTO 100

	50 PRINT "Shouldn't be here."

	60 END

	100 PRINT "Hi!"



Then store it in EEProm



	ESAVE



Now, create a new program in main memory and run it



	NEW

	10 A = 10

	20 PRINT A

	30 PRINT "From RAM!"

	40 ECHAIN



List both, and run



	ELIST

	LIST

	RUN

	



# Device Support

## Current

- Arduino - ATMega 168 (~100 bytes available)

- Arduino - ATMega 368 (~1100 bytes available)

- SD cards (via SD Library, for FILES, LOAD, SAVE commands, uses 9k of ROM)

- EEProm (via EEProm Library, uses 500 bytes of ROM)

- Serial IO - command console



## Future

- PS2 Keyboard for standalone use (maybe)

- Graphics support via common function names and ANSI/ReGIS escape codes



# Known Quirks and Limitations

- If LOAD or SAVE are called, FILES fails subsequent listings

- SD cards are not hot-swappable. A reset is required between swaps.



# Authors and Contributors



- Tiny Basic 68k - Gordon Brandly [Project Page (via archive.org)](https://web.archive.org/web/20170306113457/http://members.shaw.ca:80/gbrandly/68ktinyb.html)

- Arduino Basic / Tiny Basic C - Michael Field [Project Page](http://hamsterworks.co.nz/mediawiki/index.php/Arduino_Basic)

- Tiny Basic Plus - Scott Lawrence  [Github Page](http://github.com/BleuLlama/TinyBasicPlus)



- Jurg Wullschleger - Fix for unary operations and whitespace in expressions



# Links

- [Arduino Microcontroller](http://arduino.cc)



# Licensing



Mike Field based his C port of Tiny Basic on the 68000 Tiny BASIC which carried 

the following license:



~~~

******************************************************************

*                                                                *

*               Tiny BASIC for the Motorola MC68000              *

*                                                                *

* Derived from Palo Alto Tiny BASIC as published in the May 1976 *

* issue of Dr. Dobb's Journal.  Adapted to the 68000 by:         *

*       Gordon Brandly                                           *

*       12147 - 51 Street                                        *

*       Edmonton AB  T5W 3G8                                     *

*       Canada                                                   *

*       (updated mailing address for 1996)                       *

*                                                                *

* This version is for MEX68KECB Educational Computer Board I/O.  *

*                                                                *

******************************************************************

*    Copyright (C) 1984 by Gordon Brandly. This program may be   *

*    freely distributed for personal use only. All commercial    *

*                      rights are reserved.                      *

******************************************************************

~~~



However, Mike did not include a license of his own for his

 version of this. From discussions with him, I felt that the MIT license is

the most applicable to his intent.



I am in the process of further determining what should be done wrt licensing 

further.  This entire header will likely change with the next version 0.16, 

which will hopefully nail down the whole thing so we can get back to 

implementing features instead of licenses.  Thank you for your time.



# MIT License



Copyright (c) 2012-2013



Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:



The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.



THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.