Reading and writing is too slow

MiniPOV4 and previous versions

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mschmidt
 
Posts: 17
Joined: Fri Jan 16, 2009 11:09 am

Reading and writing is too slow

Post by mschmidt »

I've soldered the MiniPOV3 today and everything works fine.

The only problem I have is that reprogramming the device takes too much time.

I use a Macbook Pro (Mac OS X 10.5.6) and a PL2303 UBS2Serial converter (I have downloaded the correct driver for the PL2303).

Here's the output I get when uploading the alt_leds example:

$ make program-alt_leds
avrdude -p attiny2313 -P /dev/cu.PL2303-0000101D -c dasa -U flash:w:alt_leds.hex

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 2.29s

avrdude: Device signature = 0x1e910a
avrdude: NOTE: FLASH memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "alt_leds.hex"
avrdude: input file alt_leds.hex auto detected as Intel Hex
avrdude: writing flash (166 bytes):

Writing | ################################################## | 100% 319.15s

avrdude: 166 bytes of flash written
avrdude: verifying flash memory against alt_leds.hex:
avrdude: load data flash data from input file alt_leds.hex:
avrdude: input file alt_leds.hex auto detected as Intel Hex
avrdude: input file alt_leds.hex contains 166 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 202.90s

avrdude: verifying ...
avrdude: 166 bytes of flash verified

avrdude: safemode: Fuses OK

avrdude done. Thank you.

All the other examples take several minutes, too. What am I doing wrong?

Cheers,

Maik

mtbf0
 
Posts: 1645
Joined: Sat Nov 10, 2007 12:59 am

Re: Reading and writing is too slow

Post by mtbf0 »

you're not doing anything wrong. that's the way it works. try going to the bathroom, grabbing a snack, playing with the cat. usb-serial converters tend to slow things down. use the opportunity to refresh yourself so your head doesn't explode when you discover your next silly programming error.

adafruit
 
Posts: 12151
Joined: Thu Apr 06, 2006 4:21 pm

Re: Reading and writing is too slow

Post by adafruit »

usb-serial converters are slow. they work, but they're slow. :(

sparr
 
Posts: 196
Joined: Tue Nov 04, 2008 5:21 pm

Re: Reading and writing is too slow

Post by sparr »

It takes 1-4 seconds to perform such operations for me with a real serial port. Has anyone considered a parallel->serial bit bang solution here?

magician13134
 
Posts: 1119
Joined: Wed Jun 13, 2007 9:17 am

Re: Reading and writing is too slow

Post by magician13134 »

I would recommend getting a USBTiny if it's that slow! It takes ~4 seconds max using that. You'll need to build a target board and it's a little less convenient, but you can use it for many, many projects.

treepour
 
Posts: 1
Joined: Wed Apr 22, 2009 12:14 am

Re: Reading and writing is too slow

Post by treepour »

magician13134 wrote:I would recommend getting a USBTiny if it's that slow! It takes ~4 seconds max using that. You'll need to build a target board and it's a little less convenient, but you can use it for many, many projects.
I'm kinda new to this, so sorry if it's a dumb question. I'm having the same S-L-O-W problem, but I built a USBTiny for another project (Mignonette), and would love to use it instead. The problem is that the MiniPOV only has a serial port, and the USBTiny only has 6 and 10 pin connectors. Do I need to modify one of them (and if so, how?), or am I not getting something obvious?

Thanks!

mtbf0
 
Posts: 1645
Joined: Sat Nov 10, 2007 12:59 am

Re: Reading and writing is too slow

Post by mtbf0 »

you'll have to pop the chip out and stick it in a breaboard and program it there. this will save you a little time at the expense of a lot of hassle.

i like to review my code during downloads to the minipov and see if i can anticipate the next idiot mistake i've made. that, or wander off to the can.

xor
 
Posts: 6
Joined: Mon Nov 23, 2009 8:29 am

Re: Reading and writing is too slow

Post by xor »


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