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matherp
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Posted: 03:28pm 20 Dec 2022

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Version 5.07.06b5

https://geoffg.net/Downloads/picomite/PicoMite_Beta.zip

Support for a full file system on the Pico's flash which will always be available. All SD file commands are supported. Flash drive is "A:" An SDcard if configured is drive "B:"
By default the system restarts with the active drive as drive "A:" even if the SDcard is configured
Use the command:
"DRIVE drive$" to change drive, drive$ can be "A:" or "B:"
In general file commands can specify the disk irrespective of the active disk

e.g "OPEN "B:/mydir/myfile.dat" or "PLAY WAV "A:mywav.wav"

exceptions are MKDIR, CHDIR, RMDIR and RENAME which operate on the active disk

On first installation the firmware will automatically create the flash drive. The firmware reads the size of the flash and uses this to determine the drive size. Flash chips > 2Mb are fully supported
The disk size will be 806916bytes == 788Kb with the PicoMiteVGA firmware on a standard Raspberry Pi Pico and 692Kb with the PicoMite firmware.

Use DRIVE "A:/FORMAT" to re-initialise it if required
Use mm.info(drive) to get the current active drive - returns A: or B:
Use mm.info(free space) to see how much space is left on the active drive
Use mm.info(disk size) to see the size of the active drive

New functions
MATH(CRC8 array(), length, [polynome,] [startmask,] [endmask,] [reverseIn,] [reverseOut]
MATH(CRC12 array(), length, [polynome,] [startmask,] [endmask,] [reverseIn,] [reverseOut]
MATH(CRC16 array(), length, [polynome,] [startmask,] [endmask,] [reverseIn,] [reverseOut]
MATH(CRC32 array(), length, [polynome,] [startmask,] [endmask,] [reverseIn,] [reverseOut]
defaults for startmask, endmask reverseIn, and reversOut are all zero
defaults for polynomes are CRC8=&H07, CRC12=&H80D, CRC16=&H1021, crc32=&H04C11DB7

e.g.
for crc16_CCITT use MATH(CRC16 array(), n,, &HFFFF)
so:
DIM a%(8)=(49,50,51,52,53,54,55,56,57)
PRINT HEX$(MATH(CRC16 a%(),9,,&HFFFF)) gives &H29B1

Changed commands:
SPI command now takes the channel e.g. "SPI 1 OPEN 1000000,3" or "SPI 2 OPEN 50000,0"
the SPI2 command is deprecated
The firmware will automatically convert old style commands to the new format which will show when the program is listed and saved

The maximum program size for the PicoMite is now 116Kb (down from 120kB)
The maximum program size for the PicoMiteVGA remains 100Kb
The number of flash slots in both versions is now 5

Installing this version will clear all current options and flash slots. Clearing all the flash before installation is recommended

Volhout
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Joined: 05/03/2018
Location: Netherlands
Posts: 4854

Posted: 03:52pm 20 Dec 2022

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Thanks Peter,

I will try tonight !!

Volhout

EDIT: 300ms for pico at 126MHz. This is GREAT !!!!
Edited 2022-12-21 02:05 by Volhout

PicomiteVGA PETSCII ROBOTS

matherp
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Posts: 10067

Posted: 03:54pm 20 Dec 2022

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Next beta will also allow strings and not just numerical arrays as input to the CRC calcs

Volhout
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Posts: 4854

Posted: 04:05pm 20 Dec 2022

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Sorry... 300us of coarse !!!

PicomiteVGA PETSCII ROBOTS

matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10067

Posted: 04:09pm 20 Dec 2022

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@126MHz

Edited 2022-12-21 02:10 by matherp

Tinine
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Joined: 30/03/2016
Location: United Kingdom
Posts: 1646

Posted: 04:59pm 20 Dec 2022

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This is insane....matherp must be an AI construct of some sort

Craig

JohnS
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Joined: 18/11/2011
Location: United Kingdom
Posts: 3998

Posted: 06:23pm 20 Dec 2022

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Nah, they're not that good!

John

Volhout
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Posted: 06:41pm 20 Dec 2022

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Looks like the algorithm is solid. All tested outputs so far match exactly.

'MATH CRC evaluation

option base 1

'determine timer set/read time
timer=0
tr=timer

? tr*1000;" us"

'test string
a$="123456789"
l%=len(a$)

'convert test string to array (needed in V50706b5)
dim b%(l%)
for i=1 to l% : b%(i)=asc(mid$(a$,i,1)) : next i

'perform CRC validation
dim CRC%

'check CCITT CRC16
timer=0
CRC% = math (crc16 b%(),l%,,&hffff)
t=timer
? "CRC16-CCITT �";(t-tr)*1000;" us, CRC = &h"; hex$(CRC%)

'check MODBUS CRC16
timer=0
CRC% = math (crc16 b%(),l%,&h8005,&hffff,0,1,1)
t=timer
? "CRC16-MODBUS ";(t-tr)*1000;" us, CRC = &h"; hex$(CRC%)

'check XMODEM CRC16
timer=0
CRC% = math (crc16 b%(),l%)
t=timer
? "CRC16-XMODEM ";(t-tr)*1000;" us, CRC = &h"; hex$(CRC%)

'check MAXIM CRC8 (used in DALLAS signle wire devices)
timer=0
CRC% = math (crc8 b%(),l%,&h31,,,1,1)
t=timer
? "CRC8-MAXIM � ";(t-tr)*1000;" us, CRC = &h"; hex$(CRC%)

'check standard CRC32
timer=0
CRC% = math (crc32 b%(),l%,,&hffffffff,&hffffffff,1,1)
t=timer
? "CRC32 � � � �";(t-tr)*1000;" us, CRC = &h"; hex$(CRC%)

And it really fast....

RUN
48 us
CRC16-CCITT 199 us, CRC = &h29B1
CRC16-MODBUS 208 us, CRC = &h4B37
CRC16-XMODEM 137 us, CRC = &h31C3
CRC8-MAXIM 224 us, CRC = &hA1
CRC32 259 us, CRC = &hCBF43926

Edited 2022-12-21 04:44 by Volhout

PicomiteVGA PETSCII ROBOTS

Tinine
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Posts: 1646

Posted: 06:47pm 20 Dec 2022

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JohnS said Nah, they're not that good!

John

Tinine
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Joined: 30/03/2016
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Posted: 06:51pm 20 Dec 2022

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These developments are all very well but they inspire (really good) feature creep for my machine controller.

No turkey for this guy (again). More like a chicken butty while I type.

Turbo46

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Joined: 24/12/2017
Location: Australia
Posts: 1636

Posted: 09:48pm 20 Dec 2022

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Thank you for your work on the CRCs Peter and thank you Voulhout for raising it again. It's great to see the CRC getting some TLC at last.

I hope that now they can be more widely used and appreciated.

Now is it possible for it to migrate to other 'mites when the dust settles?

A CSUB or CFUNCTION for the good old MX170 where the speed gain would be most appreciated?

Bill

Keep safe. Live long and prosper.

Volhout
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Location: Netherlands
Posts: 4854

Posted: 01:33pm 21 Dec 2022

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Hi Peter,

I found a flaw in the 50706b5 (but probably also in earlier).

SETPIN gp8,FIN

When you run this code WHILE a input signal is present the pico locks up (USB stops communicating).

At 100kHz and higher the pico locks up
Below 10kHz the pico works

This is on the normal pico, not VGA (VGA uses gp8 for keyboard).
Maybe a small delay in in the init will solve this ?
I assume the pin interrupt is enabled, before the interrupt handler is active. Maybe due to installing the handler in RAM.

Regards,

Volhout
Edited 2022-12-21 23:57 by Volhout

PicomiteVGA PETSCII ROBOTS

matherp
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Joined: 11/12/2012
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Posts: 10067

Posted: 02:41pm 21 Dec 2022

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Version 5.07.06b6

https://geoffg.net/Downloads/picomite/PicoMite_Beta.zip

Fixes bug in setpin fin,per,cin when fast signal is established before the setpin
Changes the priority of the CIN,FIN,PER interrupt to improve accuracy - tests accurate at 500KHz with CPU speed of 378MHz and 200KHz at default CPU speed

MATH(CRCn �function now accepts a string as the input

e.g.

a$="123456789"
? math(crc16 a$,9,,&H1021)
Edited 2022-12-22 00:47 by matherp

Volhout
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Location: Netherlands
Posts: 4854

Posted: 07:53pm 21 Dec 2022

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Hi Peter,

- Counter FIN/CIN improved dramatically ! Thanks
- Strings in MATH CRC: works great (and again faster), Thanks !!

Volhout

PicomiteVGA PETSCII ROBOTS

phil99

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Joined: 11/02/2018
Location: Australia
Posts: 2417

Posted: 07:19am 22 Dec 2022

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If FIN is working I must be doing something wrong.
Measured 333 Hz on gp14 and gp6.

> option list
PicoMiteVGA MMBasic Version 5.07.06b6
OPTION SYSTEM I2C GP4,GP5
OPTION COLOURCODE ON
OPTION KEYBOARD US
OPTION SDCARD GP13, GP10, GP11, GP12
OPTION RTC AUTO ENABLE
OPTION COUNT GP6,GP7,GP14,GP15

>setpin gp0, pwm
> setpin gp14,fin
> pwm 0,333,50
> do :pause 1000 :? pin(gp14):loop
0
0
0
0
0
0
0
0
> setpin gp6,fin
> do :pause 1000 :? pin(gp6):loop
0
0
0
0
0
0

matherp
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Posts: 10067

Posted: 07:54am 22 Dec 2022

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Are you connecting the correct pins?

Edited 2022-12-22 17:59 by matherp

Volhout
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Posts: 4854

Posted: 09:11am 22 Dec 2022

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@Peter,

On the standard picomite it works. I can cionfirm.

Phil is running the VGA version, not using the default configuration
Default: gp6,gp7=audio, gp14,gp15=I2C
Phils board: gp6,gp7,gp14,gp15 = COUNT

Maybe there is something not going well becuase this different pin assignment.

I have used Phils OPTION LIST (no RTC AUTO, since I have no RTC) on a bare picomite prograqmmed with the VGA firmware, and see the same.

Regards,

Volhout
Edited 2022-12-22 19:13 by Volhout

PicomiteVGA PETSCII ROBOTS

matherp
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Posts: 10067

Posted: 10:12am 22 Dec 2022

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OK found the cause. It happened between 5.07.05RC6 and RC7 and is to do with a change I made to the keyboard handling. The problem only arises when OPTION KEYBOARD is set (default on the VGA version) hence seeing it on the VGA version. Can replicate on the ordinary version by setting OPTION KEYBOARD UK
Now just need to fix

UPDATE: I've replaced the firmware in the latest download, please re-download and test
Edited 2022-12-22 20:45 by matherp

phil99

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Posted: 11:04am 22 Dec 2022

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Thank you for the updated version. Perfect.

Mixtel90

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Posts: 7505

Posted: 11:51am 22 Dec 2022

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Crikey, Peter, you're on a roll at the moment aren't you? :) Nice work!

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

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