Dryos Basic scripting

reyalp

14117

Re: Dryos Basic scripting

« Reply #20 on: 14 / August / 2010, 20:50:57 »

Advertisements

function syntax

Code: [Select]

private function twoplus(arg)
	twoplus = arg + 2
end function

...
	if twoplus(2) = 4 then
		LCDMsg_SetStr(b, "twoplus(2) = 4")
	end if
...

On another note:
The StartRedirectUART() function mentioned in the PDF is quite useful.

I found (on D10) that the first Printf line didn't get sent to the log unless I put a Wait(10) after the StartRedirectUART()

edit:
There also appears to be an "extern" keyword.

edit:
I've updated the wiki page with adapted versions of Alfredo and Orens original PDF documentation, as well as some additional observations.

« Last Edit: 14 / August / 2010, 23:42:14 by reyalp »

Logged

Don't forget what the H stands for.

reyalp

14117

Re: Dryos Basic scripting

« Reply #21 on: 15 / August / 2010, 00:01:23 »

Quote from: ewavr on 14 / August / 2010, 02:03:01

@reyalp, multiply(*) is working in your D10?
It seems that a=2*2 crashes my a710, but a=2+2 works

Looks like they use space to decide if it's a pointer dereference or multiplication.

Code: [Select]

	StartRedirectUART(1)
	Wait(10)
	a = 2 * 2
	b = &a
	Printf("%d %08X\n",a,b)
	*b = 42
	Printf("%d %08X\n",a,b)

output:

Code: [Select]

4 0034E414
42 0034E414

If I change it to 2*2 with no space, it asserts.

edit:
The same applies to & which can be bitwise and or "address of"

The C bitwise operators << >> | & all seem to produce the expected results.

!, % and ~ all appear to assert.

edit: Some more oddities
Why is there peek and poke if you can just do *ptr ? I guess MMIO might require actual byte or halfword access.

There don't seem to be any logical operators, e.g I don't see any way to say
if x = 1 and y = 3 ....
& and | have their regular bitwise meanings in conditionals. The C style && || don't work, and neither do the english AND OR.

« Last Edit: 15 / August / 2010, 01:12:50 by reyalp »

Logged

Don't forget what the H stands for.

c10ud

245

Re: Dryos Basic scripting

« Reply #22 on: 15 / August / 2010, 12:52:44 »

very interesting stuff!

just tried the firmware dumper with a SX200 and it worked great altrough the screen isn't showing any message.. i'll now make some more tests, too bad i don't own a 2010 camera

edit: uartredirect seems working too

« Last Edit: 15 / August / 2010, 12:58:44 by c10ud »

Logged

reyalp

14117

Re: Dryos Basic scripting

« Reply #23 on: 15 / August / 2010, 14:23:23 »

Quote from: c10ud on 15 / August / 2010, 12:52:44

very interesting stuff!

just tried the firmware dumper with a SX200 and it worked great altrough the screen isn't showing any message..

Was the upper left of the screen black or very dark ? The default text color is black, so you won't see the messages if there are no images on the camera, or that part of the image is dark. In my experience, the camera will shut down if you try to call a non-existent function.

Logged

Don't forget what the H stands for.

c10ud

245

Re: Dryos Basic scripting

« Reply #24 on: 15 / August / 2010, 15:04:36 »

i checked the firmware's strings and they indeed exist and don't crash the camera, since i didn't have any pic i guess it's just black on black then

Logged

fe50

3152
IXUS50 & 860, SX10 Star WARs-Star RAWs

Re: Dryos Basic scripting

« Reply #25 on: 15 / August / 2010, 16:00:00 »

Quote from: reyalp on 15 / August / 2010, 14:23:23

Was the upper left of the screen black or very dark ?

LOL - the color palette also wasn't really friendly to me when i did a fast test on my SD870 yesterday - black on black !
...with a white image the text is visible, dark-red on this camera.

Logged

-->FIRMWARE DUMPS<-- * Manual * Lua * me

msl

1280
A720 IS, SX220 HS 1.01a

Re: Dryos Basic scripting

« Reply #26 on: 15 / August / 2010, 16:02:12 »

Good investigations - respect for your work.

"Hello world" and firmware dump script work properly for a720. But the text color is red!

msl

Logged

CHDK-DE: CHDK-DE links

reyalp

14117

Re: Dryos Basic scripting

« Reply #27 on: 15 / August / 2010, 20:38:15 »

StartRedirectUART() actually takes two arguments. The second is a file name. NULL gives you the auto generated filenames. If you specify a filename, output is appended to it.

I'm not completely sure what the first is, but it looks like it's a buffer size, which is rounded up to 8192.

Note also that this won't normally capture the camera log, but you can do ShowCameraLog() to record recent entries. Other functions that print to the camera console, such as ShowAllTaskInfo will also get logged.

Logged

Don't forget what the H stands for.

aortega

6

Re: Dryos Basic scripting

« Reply #28 on: 16 / August / 2010, 00:54:42 »

Excellent info reyalp.

One procedure that we couldn't make work was drysh(), it actually spawns a shell (Yes! a shell!) and connects it's output to stdout and stdin. I could see the shell output via StartRedirectUART() but sadly couldn't redirect stdin to it in any way. It would be great to issue commands to this "shell".

Logged

reyalp

14117

Re: Dryos Basic scripting

« Reply #29 on: 16 / August / 2010, 01:53:07 »

Quote from: aortega on 16 / August / 2010, 00:54:42

Excellent info reyalp.

One procedure that we couldn't make work was drysh(), it actually spawns a shell (Yes! a shell!) and connects it's output to stdout and stdin. I could see the shell output via StartRedirectUART() but sadly couldn't redirect stdin to it in any way. It would be great to issue commands to this "shell".

You'd have to hook up your own device driver. This is how output was camera console output was captured on vxworks cameras. (see generic/main.c console_init) This is easier on vxworks though, since complete documentation is readily available.

Or figure out how to physically wire up to the UART

Another oddity:
I tried to use PostLogicalEvent* to switch to rec mode (exact same sequence as CHDK uses) and shoot pictures, but the events to switch to rec mode only get processed after the script ends, even if you Wait().

Logged

Don't forget what the H stands for.