Take a look at the source for the black magic probe... IIRC it provides two ACM devices.
Daniel. On March 26, 2017 2:25:53 AM GMT+01:00, Jason Kotzin <jasonkot...@gmail.com> wrote: >Yes, this is possible. You just need an descriptor for a composite >device that has two ACM devices. > >Not a feature of libopencm3, but a feature of the USB spec. > >I believe there are multiple examples of combined devices in >libopencm3. > >But they would show up as COM1 / COM2 or /dev/ttyUSB0 and /devttyUSB1 >respectively and you would handle each of the data on them >independently in the firmware. > >Sincerely, >Jason Kotzin > >> On Mar 25, 2017, at 2:56 PM, kristoff <krist...@skypro.be> wrote: >> >> Hi, >> >> >> To continue the "USB"-related threads here, a question. >> >> I would like to use a mapple-mini clone (STM32F103) with libopencm3 >to >> make a programmmer for the olimex ice40HX1K fpga board (*) >> >> In fact, it is actually a programmer for the winbond 2MB >flash-memory. >> There is already an arduino sketch for this and the linux-based >> "flashrom" tool also works (tested it on a RPi), so it should be >doable. >> >> >> >> An interesting thing is that the programming-connector on dev-board >not >> only provides access to the flash-memory to program that chip, but >also >> to two ports on the fpga itself. These can be used as as UART >connection >> back between the fpga and (say) a PC. >> >> >> >> The arduino sketch only has one single serial connection, so both >> applications are multiplex on that one link. >> >> However, the the mapple mini-clone STM32F103 has a USB interface, and > >> you can do ACM (serial-over-usb) in software on the STM32F1, so I was > >> wondering if it not possible to provide two serial virtual >connections >> on that USB link: one for the programming interface and one for the >> serial UART connection directly towards the FPGA. >> >> >> I know it is possible to define multiple services over USB, and set >up >> multiple endpoints; but how would you configure two ACM interfaces >over >> one single USB connection? >> >> >> >> Any ideas? >> >> >> Cheerio! Kr. Bonne. >> >> >> >> >> >> >> (*) >> >https://www.olimex.com/Products/FPGA/iCE40/iCE40HX1K-EVB/open-source-hardware >> >> >> >------------------------------------------------------------------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> libopencm3-devel mailing list >> libopencm3-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/libopencm3-devel > > >------------------------------------------------------------------------------ >Check out the vibrant tech community on one of the world's most >engaging tech sites, Slashdot.org! http://sdm.link/slashdot >_______________________________________________ >libopencm3-devel mailing list >libopencm3-devel@lists.sourceforge.net >https://lists.sourceforge.net/lists/listinfo/libopencm3-devel -- Sent using a tiny, tiny keyboard. Pleasw excise any spelkinh nistajes. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ libopencm3-devel mailing list libopencm3-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/libopencm3-devel
