Timeline for Scanalogic DIY Logic Analyzer, Extending Sample Time
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Dec 26, 2012 at 18:20 | comment | added | Oli Glaser | Just to note, UART can be run at over 1MHz (e.g. betweeen micros on the same PCB), but PCs generally don't go this high. It would be better if it used e.g. high speed USB which can do a few MB per second easily. | |
| Dec 26, 2012 at 18:14 | comment | added | Oli Glaser | @capcom - yes, you are right about both there - it would be possible to read/send continuously using a buffer, but it would be limited by the maximum speed of the UART connection. Unfortunately also the firmware/software would have to be written this way (i.e. if the sample rate drops below a certain rate the data is sent continuously - this is what I would do if I was writing it, using a FIFO/circular buffer to synchronise the data rate) | |
| Dec 26, 2012 at 14:35 | comment | added | capcom | @OliGlaser Maybe I will ask. I was wondering, however, if it would be possible for it to run continuously. So it just keeps transmitting the logic signals it picks up, and doesn't have to reach the capacity of its memory. Is this possible? I was thinking that the problem would be that UART speed is too slow, and unreliable at high enough speeds to match, say, even 1 MHz. | |
| Dec 26, 2012 at 13:07 | comment | added | Oli Glaser | I was thinking of this also but noticed it's only provided in hex format, which is a shame as this would have been the best option (maybe asking the author to provide an option for a higher spec ATmega might be an idea?). | |
| Dec 26, 2012 at 4:05 | comment | added | Gustavo Litovsky | I didn't realize it's closed source. Then there is really no way to add more memory unless you somehow hack the code. Upgrading the device as I suggesting is simpler in all cases to adding external SRAM (which is likely to be much more work and might not be worth it, or eve possible). I suggest you contact the developers and inquire about the source code. Or even better, build one yourself! | |
| Dec 26, 2012 at 3:58 | comment | added | capcom | But it's not open source, so I can't play around with the code. Is there any way to attach external memory to my current setup? | |
| Dec 26, 2012 at 2:56 | history | answered | Gustavo Litovsky | CC BY-SA 3.0 |