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hosted: Update Readme.md

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Uwe Bonnes 2020-09-01 12:35:57 +02:00 committed by UweBonnes
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src/platforms/hosted/Readme.md
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@ -73,7 +73,7 @@ REMOTE_BMP is a "normal" BMP usb connected
## Device matching ## Device matching
As other USB dongles already connected to the host PC may use FTDI chips, As other USB dongles already connected to the host PC may use FTDI chips,
cable descriptions are provided to match with the dongle. cable descriptions must be provided to match with the dongle.
To match the dongle, at least USB VID/PID that must match. To match the dongle, at least USB VID/PID that must match.
If a description is given, the USB device must provide that string. If a If a description is given, the USB device must provide that string. If a
serial number string is given on the command line, that number must match serial number string is given on the command line, that number must match
@ -125,6 +125,11 @@ together with the 'r' argument.
As the FTDI has more pins, these pins may be used to control As the FTDI has more pins, these pins may be used to control
enables of buffers and multiplexer selection in many variants. enables of buffers and multiplexer selection in many variants.
### FTDI SWD speed
SWD read needs two USB round trip, one for the acknowledge and one
round-trip after the data phase, while JTAG only needs one round-trip.
For that, SWD read speed is about half the JTAG read speed.
### Reset, Target voltage readback etc ### Reset, Target voltage readback etc
The additional pins may also control Reset functionality, provide The additional pins may also control Reset functionality, provide
information if target voltage is applied. etc. information if target voltage is applied. etc.
@ -139,11 +144,3 @@ is welcome.
### Discussions on Discord. ### Discussions on Discord.
You can find the Discord link here: https://1bitsquared.com/pages/chat You can find the Discord link here: https://1bitsquared.com/pages/chat
### Blackmagic mailing list http://sourceforge.net/mail/?group_id=407419 ### Blackmagic mailing list http://sourceforge.net/mail/?group_id=407419
## Known deficiencies
### For REMOTE_BMP
#### On windows, the device node must be given on the command line
Finding the device from USB VID/PID/Serial in not yet implemented
### FTDI MPSSE
#### No auto detection
Cable description must be given on the command line