AVR Downloader/UploaDEr - Bugs: bug #55884, ft232r communication fails on...
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bug #55884: ft232r communication fails on programmed part if miso line toggles
Submitter: | Klaus Syttkus <mumpel> | ||
Submitted: | Mon 11 Mar 2019 11:43:09 AM UTC | ||
Category: | None | Severity: | 3 - Normal |
Priority: | 5 - Normal | Item Group: | None |
Status: | Works For Me | Privacy: | Public |
Assigned to: | None | Originator Name: | Klaus Syttkus |
Open/Closed: | Open | Release: | 6.3 |
Programmer hardware: | ft232r | Device type: | t85 |
Sun 28 Nov 2021 10:34:37 PM UTC, comment #1: |
Joerg Wunsch <joerg_wunsch>![]() |
Mon 11 Mar 2019 11:43:09 AM UTC, original submission:
I use the miso line for UART emulation on my ATtiny, so that I can use the FT232R in ftdi_sio mode for communication.
|
Klaus Syttkus <mumpel> |
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Follow 2 latest changes.
Date | Changed by | Updated Field | Previous Value | => | Replaced by |
---|---|---|---|---|---|
2021-11-28 | joerg_wunsch | Status | None | ![]() |
Works For Me |
2019-03-11 | mumpel | Carbon-Copy | - | ![]() |
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Well, I tried to reproduce the problem. I wrote a firmware that toggles MOSI each 100 µs (on an ATmega16 but I don't think that matters much). I can connect to the target without any problems using both, the ft232r as well as the ft245r programmer.
When adding your suggested patch, the ft232r programmer still works, but the ft245r programmer breaks, and cannot connect anymore.
So seems we need some more analysis.
Can you upload a (simplified) firmware that triggers the bug, together with the avrdude commandline used?