Objective Development Forums

That's about what I can get. Using a 16 bit message size might help, but I have yet to try it.

That's a bit of a suspicious result I think.
According to http://forums.obdev.at/viewtopic.php?t=19&postdays=0&postorder=asc&start=0, the theoretical limit is 24kbps and no one got above 7kbps.

Can you post more details and double check your results?

Hi. The sample rate is variable and is set by the host (from 1.1 kHz - >10 kHz), and from my testing it is quite accurate. I built a small circuit using an ATTINY85 with a diode and BJT to reduce the 5V USB supply down to ~3.6 V. I used the 16.5 MHz RC module, which is good enough for me. My softwar...

Sorry I haven't had a chance to post this until now or to clean up my code, but here it is: http://www.megaupload.com/?d=EXUBE3WX

usbtest.c is the main program.

I can almost guarantee there are lots of bugs, so good luck

Sure, happy to share. Here is the most relevant code: volatile uint8_t adcbuff[250]; // must be multiple of 5 for 10 bit mode volatile uint8_t end = 0; volatile uint8_t start = 0, bytes_ready; volatile uint8_t adc_10bit_mode = 0; #define ADCBufferSize() ((end - start + DAC_BUFF_SIZE&...

Thanks, I got it working using a circular buffer and using usbFunctionRead() to send the data.

Is it possible to do this? I'm not familiar with the driver code so I'm not sure what else will need changing in the header file: /* ----------------------- Optional MCU Description ------------------------ */ /* The following configurations have working defaults in usbdrv.h. You * usually don't nee...

I've made some progress and have something that works, but I still need to work out the best way to send the ADC output back to the host. So far I've only tried the default control endpoint, and I can get about 300 bytes/s sending back the ADC contents when requested by the host. FYI the code is som...

I'm able to get at least 7230 bytes/s (tested with pyUSB) using usbFunctionRead() and sending 254 bytes at a time.

Hi, I'm new to USB programming and would like some advice on how I should proceed. I'm trying to write a program that will continuously (and preferably uniformly) sample a voltage via the integrated ADC on an AVR, and send the values over USB. I'll either use an ADC resolution of 8 or 10 bits and I'...

Thanks Christian, I got EasyLogger working with a ATTINY45 and some diodes I salvaged.

I have a couple 1N4729A 3.6V, 1W zener diodes. Will these work with a 20 MHz clock? I didn't even think about the low power requirement when I bought them.

Thanks,
Roger