RISC OS Open: Forum: Connecting to RPi PicoMite via USB

Jul 19, 2023 12:21am

Hello,

I’d like to connect a Raspberry Pi 3+ running RISC OS with a PicoMite via USB to program it.

A PicoMite is a Raspberry Pi Pico microcontroller board running the MMBasic interpreter. The PicoMite creates a virtual serial port over it’s USB connection using the CDC protocol. Connected to a Windows or Linux PC, you use a VT 100 terminal emulation to issue MMBasic commands to be executed on the PicoMite. Please visit geoffg.net for more details.

On the Raspberry Pi 3+ running RISC OS 5.28, I’ve installed the SerialUSB module from Colin Granville and the BlockDrivers from X-Ample Technology. I expected this would allow me to connect to the PicoMite using the modified HearSay 2.24, but the virtual serial port is not recognised.

Before plugging in the PicoMite, *Filer_OpenDir Devices.$ shows nine icons named Serial1 and USB1 to USB8. After plugging in the PicoMite, an additional USB9 icon shows up.

As I understand it, the SerialUSB module does not recognise the PicoMite’s implementation of a virtual serial port or the CDC protocol, and without this “mapping” I can’t use HearSay.

Can I do anything else to have SerialUSB recognise the PicoMite, or is there another way to exchange data? I’d be happy to experiment with BASIC or the BASIC Assembler.

I’ve added some USB related CLI commands with results below. I would appreciate any help.

*SerialUSBDevices
This command gives no output at all.


*USBDevices
No. Bus Dev Class Description
  9   1   9 EF/ 2 Raspberry Pi Pico


*USBDevInfo 9
USB release     : 0200
Device class    : EF
Device subclass : 02
Device protocol : 01
Max packet size : 40
Vendor ID       : 2E8A
Product ID      : 000A
Device ID       : 0100
# of configs    : 1
Manufacturer    : 'Raspberry Pi'
Product         : 'Pico'
Serial number   : 'E6605838836B12D'
Speed           : Full


*show USB$Device*2E8A_000A*
USB$Device_02_02_00_2E8A_000A_01_01_0100_USB9 : 9 0 0
USB$Device_0A_00_00_2E8A_000A_01_01_0100_USB9 : 9 1 0
USB$Device_EF_02_01_2E8A_000A_-1_-1_0100_USB9 : 9


*usbdescriptors USB9
USBDescriptors v1.08 (05-Apr-2021)

=============================================
 Device USB9
=============================================
:  0 :  2 : total size of ServiceCall block : 127
:  2 :  2 : offset to descriptor list       : 0x20
:  4 : 20 : name                            : USB9
: 24 :  1 : bus number                      : 1
: 25 :  1 : device address                  : 9
: 26 :  1 : host address                    : 5
: 27 :  1 : host port                       : 3
: 28 :  1 : speed                           : 2 full speed
---------------------------------------------

 Standard Device Descriptor
+----+----+---------------------------+----------+------------+
:Off :Sz  :Name                       :Value hex :Value dec   :
+----+----+---------------------------+----------+------------+
:  0 :  1 : bLength                   :       12 :         18 :
:  1 :  1 : bDescriptorType           :        1 :          1 :
:  2 :  2 : bcdUSB                    :      200 :        512 :
:  4 :  1 : bDeviceClass              :       ef :        239 : Miscellaneous
:  5 :  1 : bDeviceSubClass           :        2 :          2 :
:  6 :  1 : bDeviceProtocol           :        1 :          1 :
:  7 :  1 : bMaxPacketSize            :       40 :         64 :
:  8 :  2 : idVendor                  :     2e8a :      11914 :
: 10 :  2 : idProduct                 :        a :         10 :
: 12 :  2 : bcdDevice                 :      100 :        256 :
: 14 :  1 : iManufacturer             :        1 :          1 : 'Raspberry Pi'
: 15 :  1 : iProduct                  :        2 :          2 : 'Pico'
: 16 :  1 : iSerialNumber             :        3 :          3 : 'E6605838836BC12D'
: 17 :  1 : bNumConfigurations        :        1 :          1 :
+----+----+---------------------------+----------+------------+

 Standard Configuration Descriptor
+----+----+---------------------------+----------+------------+
:Off :Sz  :Name                       :Value hex :Value dec   :
+----+----+---------------------------+----------+------------+
:  0 :  1 : bLength                   :        9 :          9 :
:  1 :  1 : bDescriptorType           :        2 :          2 :
:  2 :  2 : wTotalLength              :       4b :         75 :
:  4 :  1 : bNumInterfaces            :        2 :          2 :
:  5 :  1 : bConfigurationValue       :        1 :          1 :
:  6 :  1 : iConfiguration            :        0 :          0 : ''
:  7 :  1 : bmAttributes              :       80 :        128 : (bit7) USB 1.0 bus powered (bit6) Bus powered, (bit5) No remote wakeup
:  8 :  1 : bMaxPower                 :       7d :        125 : 250mA
+----+----+---------------------------+----------+------------+

Standard Interface Association Descriptor
+----+----+---------------------------+----------+------------+
:Off :Sz  :Name                       :Value hex :Value dec   :
+----+----+---------------------------+----------+------------+
:  0 :  1 : bLength                   :        8 :          8 :
:  1 :  1 : bDescriptorType           :        b :         11 :
:  2 :  1 : bFirstInterface           :        0 :          0 :
:  3 :  1 : bInterfaceCount           :        2 :          2 :
:  4 :  1 : bFunctionClass            :        2 :          2 : Communications and CDC Control
:  5 :  1 : bFunctionSubClass         :        2 :          2 :
:  6 :  1 : bFunctionProtocol         :        0 :          0 :
:  7 :  1 : iFunction                 :        0 :          0 : ''
+----+----+---------------------------+----------+------------+

     Standard Interface Descriptor
    +----+----+---------------------------+----------+------------+
    :Off :Sz  :Name                       :Value hex :Value dec   :
    +----+----+---------------------------+----------+------------+
    :  0 :  1 : bLength                   :        9 :          9 :
    :  1 :  1 : bDescriptorType           :        4 :          4 :
    :  2 :  1 : bInterfaceNumber          :        0 :          0 :
    :  3 :  1 : bAlternateSetting         :        0 :          0 :
    :  4 :  1 : bNumEndpoints             :        1 :          1 :
    :  5 :  1 : bInterfaceClass           :        2 :          2 : Communications and CDC Control
    :  6 :  1 : bInterfaceSubClass        :        2 :          2 :
    :  7 :  1 : bInterfaceProtocol        :        0 :          0 :
    :  8 :  1 : iInterface                :        4 :          4 : 'Board CDC'
    +----+----+---------------------------+----------+------------+

*** Unknown Descriptor ***
bLength:          5
bDescriptorType:  0x24 (36)
Byte   2:  0x00 (0)
Byte   3:  0x20 (32)
Byte   4:  0x01 (1)

*** Unknown Descriptor ***
bLength:          5
bDescriptorType:  0x24 (36)
Byte   2:  0x01 (1)
Byte   3:  0x00 (0)
Byte   4:  0x01 (1)

*** Unknown Descriptor ***
bLength:          4
bDescriptorType:  0x24 (36)
Byte   2:  0x02 (2)
Byte   3:  0x02 (2)

*** Unknown Descriptor ***
bLength:          5
bDescriptorType:  0x24 (36)
Byte   2:  0x06 (6)
Byte   3:  0x00 (0)
Byte   4:  0x01 (1)

         Standard Endpoint Descriptor
        +----+----+---------------------------+----------+------------+
        :Off :Sz  :Name                       :Value hex :Value dec   :
        +----+----+---------------------------+----------+------------+
        :  0 :  1 : bLength                   :        7 :          7 :
        :  1 :  1 : bDescriptorType           :        5 :          5 :
        :  2 :  1 : bEndpointAddress          :       81 :        129 : Endpoint 1 - IN
        :  3 :  1 : bmAttributes              :        3 :          3 : Interrupt
        :  4 :  2 : wMaxPacketSize            :        8 :          8 : 1 x 8 byte max packets
        :  6 :  1 : bInterval                 :       10 :         16 :
        +----+----+---------------------------+----------+------------+

     Standard Interface Descriptor
    +----+----+---------------------------+----------+------------+
    :Off :Sz  :Name                       :Value hex :Value dec   :
    +----+----+---------------------------+----------+------------+
    :  0 :  1 : bLength                   :        9 :          9 :
    :  1 :  1 : bDescriptorType           :        4 :          4 :
    :  2 :  1 : bInterfaceNumber          :        1 :          1 :
    :  3 :  1 : bAlternateSetting         :        0 :          0 :
    :  4 :  1 : bNumEndpoints             :        2 :          2 :
    :  5 :  1 : bInterfaceClass           :        a :         10 : CDC Data
    :  6 :  1 : bInterfaceSubClass        :        0 :          0 :
    :  7 :  1 : bInterfaceProtocol        :        0 :          0 :
    :  8 :  1 : iInterface                :        0 :          0 : ''
    +----+----+---------------------------+----------+------------+

         Standard Endpoint Descriptor
        +----+----+---------------------------+----------+------------+
        :Off :Sz  :Name                       :Value hex :Value dec   :
        +----+----+---------------------------+----------+------------+
        :  0 :  1 : bLength                   :        7 :          7 :
        :  1 :  1 : bDescriptorType           :        5 :          5 :
        :  2 :  1 : bEndpointAddress          :        2 :          2 : Endpoint 2 - OUT
        :  3 :  1 : bmAttributes              :        2 :          2 : Bulk
        :  4 :  2 : wMaxPacketSize            :       40 :         64 : 1 x 64 byte max packets
        :  6 :  1 : bInterval                 :        0 :          0 :
        +----+----+---------------------------+----------+------------+

         Standard Endpoint Descriptor
        +----+----+---------------------------+----------+------------+
        :Off :Sz  :Name                       :Value hex :Value dec   :
        +----+----+---------------------------+----------+------------+
        :  0 :  1 : bLength                   :        7 :          7 :
        :  1 :  1 : bDescriptorType           :        5 :          5 :
        :  2 :  1 : bEndpointAddress          :       82 :        130 : Endpoint 2 - IN
        :  3 :  1 : bmAttributes              :        2 :          2 : Bulk
        :  4 :  2 : wMaxPacketSize            :       40 :         64 : 1 x 64 byte max packets
        :  6 :  1 : bInterval                 :        0 :          0 :
        +----+----+---------------------------+----------+------------+

---------Raw-Data-Start---------
0x7f 0x00 0x20 0x00 0x55 0x53 0x42 0x39
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x01 0x09 0x05 0x03 0x02 0x00 0x00 0x00
0x12 0x01 0x00 0x02 0xef 0x02 0x01 0x40
0x8a 0x2e 0x0a 0x00 0x00 0x01 0x01 0x02
0x03 0x01 0x09 0x02 0x4b 0x00 0x02 0x01
0x00 0x80 0x7d 0x08 0x0b 0x00 0x02 0x02
0x02 0x00 0x00 0x09 0x04 0x00 0x00 0x01
0x02 0x02 0x00 0x04 0x05 0x24 0x00 0x20
0x01 0x05 0x24 0x01 0x00 0x01 0x04 0x24
0x02 0x02 0x05 0x24 0x06 0x00 0x01 0x07
0x05 0x81 0x03 0x08 0x00 0x10 0x09 0x04
0x01 0x00 0x02 0x0a 0x00 0x00 0x00 0x07
0x05 0x02 0x02 0x40 0x00 0x00 0x07 0x05
0x82 0x02 0x40 0x00 0x00 0x00 0x00
----------Raw-Data-End----------

xxx

Jul 19, 2023 3:49am

Chris Hall (132) 3554 posts

or is there another way to exchange data?

I was using BASIC to read GPS data from the UART serial port using SYS “OS_SerialOp” but had the same trouble if I tried to use Serial_USB and the block drivers to read from a USB-connected GPS unit which had a non-supported serial port implementation. I also wanted to make it work even if the unit was unplugged and replugged (which re-enumaerates it). The lines below might help, as reported in Archive 26:3.

Simply replace this line:
2370 SYS “OS_SerialOp”,4,-1 TO ,r1% ;r2%
2380 if%+=1
2390 IF (r2% AND 2)=0 THEN
which sets bit 1 of r2% if a character is received in r1% from the UART
with these lines:
2361 SYS “XOS_ReadVarVal”,“USB$Device_02_00_00*”,,-1 TO ,,usbdev%
2362 IF usbdev% THEN
2363 r4%=-1
2364 SYS “XOS_ReadVarVal”,“USB$Device_02_00_00*”,qbuf%,256,0 TO ,,r2%,r3%,r4%
2365 IF r4%=0 THEN qbuf%?r2%=13:tusb%=VAL($qbuf%) ELSE tusb%=-1
2366 IF nusb%<>tusb% THEN
2367 REM close prev stream
2368 IF fusb% THEN CLOSE#fusb%:fusb%=0
2369 IF tusb%>0 THEN
2370 REM open new stream
2371 fusb%=OPENIN(“USB”+STR$(tusb%)+“#baud=9600;data=8;stop=1;noparity;
nohandshake;noblock:”)
2372 nusb%=tusb%
2373 ENDIF
2374 ENDIF
2375 IF nusb%=tusb% THEN
2376 REM read bytes -trap errors
2377 LOCAL ERROR
2378 ON ERROR LOCAL CLOSE#fusb%:fusb%=0:r1%=0:r2%=2
2379 IF fusb% THEN
2380 SYS “OS_GBPB”,4,fusb%,ssbuf%,1 TO ,,fend%
2381 IF ssbuf%=fend% THEN r1%=0:r2%=2 ELSE r1%=?ssbuf%:r2%=0
2382 ELSE
2383 r1%=0:r2%=2:serialOK%=FALSE
2384 ENDIF
2385 RESTORE ERROR
2386 ENDIF
2391 ELSE
2392 SYS “OS_SerialOp”,4,-1 TO ,r1% ;r2%
2393 ENDIF
2394 if%+=1
2395 IF (r2% AND 2)=0 THEN
which does the same but uses a USB-connected GPS unit if present

Jul 19, 2023 10:50am

Jean-Michel BRUCK (3009) 351 posts

From Colin Granville SerialUSB module specification:
It supports the following USB serial devices:
CH340
CP210x
PL2303
FTDI
changes
CP2102N device added.
CDC device added.

The pico cannot be recognized as a serial interface, I think? And more, the use of a virtual port with the CDC protocol? This is a question for Colin who has already done a lot for the use of USB under Risc OS.

Jul 23, 2023 12:59am

Detlef Froehlich (9715) 4 posts

Thanks for your information and code examples! I’m just testing a version of the SerialUSB module Colin Granville has kindly adapted to recognize the virtual serial interface used by PicoMite.

Aug 2, 2023 10:45pm

Detlef Froehlich (9715) 4 posts

A quick update on this topic: Colin Granville is putting a lot of work into customizing and testing SerialUSB and Hearsay to make the PicoMite usable under RISC OS. The current state is already excellent.

Connecting to RPi PicoMite via USB

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Jul 19, 2023 12:21am Detlef Froehlich (9715) 4 posts	Hello, I’d like to connect a Raspberry Pi 3+ running RISC OS with a PicoMite via USB to program it. A PicoMite is a Raspberry Pi Pico microcontroller board running the MMBasic interpreter. The PicoMite creates a virtual serial port over it’s USB connection using the CDC protocol. Connected to a Windows or Linux PC, you use a VT 100 terminal emulation to issue MMBasic commands to be executed on the PicoMite. Please visit geoffg.net for more details. On the Raspberry Pi 3+ running RISC OS 5.28, I’ve installed the SerialUSB module from Colin Granville and the BlockDrivers from X-Ample Technology. I expected this would allow me to connect to the PicoMite using the modified HearSay 2.24, but the virtual serial port is not recognised. Before plugging in the PicoMite, `Filer_OpenDir Devices.$` shows nine icons named Serial1 and USB1 to USB8. After plugging in the PicoMite, an additional USB9 icon shows up. As I understand it, the SerialUSB module does not recognise the PicoMite’s implementation of a virtual serial port or the CDC protocol, and without this “mapping” I can’t use HearSay. Can I do anything else to have SerialUSB recognise the PicoMite, or is there another way to exchange data? I’d be happy to experiment with BASIC or the BASIC Assembler. I’ve added some USB related CLI commands with results below. I would appreciate any help. `SerialUSBDevices This command gives no output at all.` `USBDevices No. Bus Dev Class Description 9 1 9 EF/ 2 Raspberry Pi Pico` `USBDevInfo 9 USB release : 0200 Device class : EF Device subclass : 02 Device protocol : 01 Max packet size : 40 Vendor ID : 2E8A Product ID : 000A Device ID : 0100 # of configs : 1 Manufacturer : 'Raspberry Pi' Product : 'Pico' Serial number : 'E6605838836B12D' Speed : Full` `show USB$Device2E8A_000A* USB$Device_02_02_00_2E8A_000A_01_01_0100_USB9 : 9 0 0 USB$Device_0A_00_00_2E8A_000A_01_01_0100_USB9 : 9 1 0 USB$Device_EF_02_01_2E8A_000A_-1_-1_0100_USB9 : 9` `usbdescriptors USB9 USBDescriptors v1.08 (05-Apr-2021)` `============================================= Device USB9 ============================================= : 0 : 2 : total size of ServiceCall block : 127 : 2 : 2 : offset to descriptor list : 0x20 : 4 : 20 : name : USB9 : 24 : 1 : bus number : 1 : 25 : 1 : device address : 9 : 26 : 1 : host address : 5 : 27 : 1 : host port : 3 : 28 : 1 : speed : 2 full speed ---------------------------------------------` Standard Device Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 12 : 18 : : 1 : 1 : bDescriptorType : 1 : 1 : : 2 : 2 : bcdUSB : 200 : 512 : : 4 : 1 : bDeviceClass : ef : 239 : Miscellaneous : 5 : 1 : bDeviceSubClass : 2 : 2 : : 6 : 1 : bDeviceProtocol : 1 : 1 : : 7 : 1 : bMaxPacketSize : 40 : 64 : : 8 : 2 : idVendor : 2e8a : 11914 : : 10 : 2 : idProduct : a : 10 : : 12 : 2 : bcdDevice : 100 : 256 : : 14 : 1 : iManufacturer : 1 : 1 : 'Raspberry Pi' : 15 : 1 : iProduct : 2 : 2 : 'Pico' : 16 : 1 : iSerialNumber : 3 : 3 : 'E6605838836BC12D' : 17 : 1 : bNumConfigurations : 1 : 1 : +----+----+---------------------------+----------+------------+ Standard Configuration Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 9 : 9 : : 1 : 1 : bDescriptorType : 2 : 2 : : 2 : 2 : wTotalLength : 4b : 75 : : 4 : 1 : bNumInterfaces : 2 : 2 : : 5 : 1 : bConfigurationValue : 1 : 1 : : 6 : 1 : iConfiguration : 0 : 0 : '' : 7 : 1 : bmAttributes : 80 : 128 : (bit7) USB 1.0 bus powered (bit6) Bus powered, (bit5) No remote wakeup : 8 : 1 : bMaxPower : 7d : 125 : 250mA +----+----+---------------------------+----------+------------+ Standard Interface Association Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 8 : 8 : : 1 : 1 : bDescriptorType : b : 11 : : 2 : 1 : bFirstInterface : 0 : 0 : : 3 : 1 : bInterfaceCount : 2 : 2 : : 4 : 1 : bFunctionClass : 2 : 2 : Communications and CDC Control : 5 : 1 : bFunctionSubClass : 2 : 2 : : 6 : 1 : bFunctionProtocol : 0 : 0 : : 7 : 1 : iFunction : 0 : 0 : '' +----+----+---------------------------+----------+------------+ Standard Interface Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 9 : 9 : : 1 : 1 : bDescriptorType : 4 : 4 : : 2 : 1 : bInterfaceNumber : 0 : 0 : : 3 : 1 : bAlternateSetting : 0 : 0 : : 4 : 1 : bNumEndpoints : 1 : 1 : : 5 : 1 : bInterfaceClass : 2 : 2 : Communications and CDC Control : 6 : 1 : bInterfaceSubClass : 2 : 2 : : 7 : 1 : bInterfaceProtocol : 0 : 0 : : 8 : 1 : iInterface : 4 : 4 : 'Board CDC' +----+----+---------------------------+----------+------------+ ` Unknown Descriptor * bLength: 5 bDescriptorType: 0x24 (36) Byte 2: 0x00 (0) Byte 3: 0x20 (32) Byte 4: 0x01 (1)` `* Unknown Descriptor * bLength: 5 bDescriptorType: 0x24 (36) Byte 2: 0x01 (1) Byte 3: 0x00 (0) Byte 4: 0x01 (1)` `* Unknown Descriptor * bLength: 4 bDescriptorType: 0x24 (36) Byte 2: 0x02 (2) Byte 3: 0x02 (2)` `* Unknown Descriptor * bLength: 5 bDescriptorType: 0x24 (36) Byte 2: 0x06 (6) Byte 3: 0x00 (0) Byte 4: 0x01 (1)` Standard Endpoint Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 7 : 7 : : 1 : 1 : bDescriptorType : 5 : 5 : : 2 : 1 : bEndpointAddress : 81 : 129 : Endpoint 1 - IN : 3 : 1 : bmAttributes : 3 : 3 : Interrupt : 4 : 2 : wMaxPacketSize : 8 : 8 : 1 x 8 byte max packets : 6 : 1 : bInterval : 10 : 16 : +----+----+---------------------------+----------+------------+ Standard Interface Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 9 : 9 : : 1 : 1 : bDescriptorType : 4 : 4 : : 2 : 1 : bInterfaceNumber : 1 : 1 : : 3 : 1 : bAlternateSetting : 0 : 0 : : 4 : 1 : bNumEndpoints : 2 : 2 : : 5 : 1 : bInterfaceClass : a : 10 : CDC Data : 6 : 1 : bInterfaceSubClass : 0 : 0 : : 7 : 1 : bInterfaceProtocol : 0 : 0 : : 8 : 1 : iInterface : 0 : 0 : '' +----+----+---------------------------+----------+------------+ Standard Endpoint Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 7 : 7 : : 1 : 1 : bDescriptorType : 5 : 5 : : 2 : 1 : bEndpointAddress : 2 : 2 : Endpoint 2 - OUT : 3 : 1 : bmAttributes : 2 : 2 : Bulk : 4 : 2 : wMaxPacketSize : 40 : 64 : 1 x 64 byte max packets : 6 : 1 : bInterval : 0 : 0 : +----+----+---------------------------+----------+------------+ Standard Endpoint Descriptor +----+----+---------------------------+----------+------------+ :Off :Sz :Name :Value hex :Value dec : +----+----+---------------------------+----------+------------+ : 0 : 1 : bLength : 7 : 7 : : 1 : 1 : bDescriptorType : 5 : 5 : : 2 : 1 : bEndpointAddress : 82 : 130 : Endpoint 2 - IN : 3 : 1 : bmAttributes : 2 : 2 : Bulk : 4 : 2 : wMaxPacketSize : 40 : 64 : 1 x 64 byte max packets : 6 : 1 : bInterval : 0 : 0 : +----+----+---------------------------+----------+------------+ ---------Raw-Data-Start--------- 0x7f 0x00 0x20 0x00 0x55 0x53 0x42 0x39 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x09 0x05 0x03 0x02 0x00 0x00 0x00 0x12 0x01 0x00 0x02 0xef 0x02 0x01 0x40 0x8a 0x2e 0x0a 0x00 0x00 0x01 0x01 0x02 0x03 0x01 0x09 0x02 0x4b 0x00 0x02 0x01 0x00 0x80 0x7d 0x08 0x0b 0x00 0x02 0x02 0x02 0x00 0x00 0x09 0x04 0x00 0x00 0x01 0x02 0x02 0x00 0x04 0x05 0x24 0x00 0x20 0x01 0x05 0x24 0x01 0x00 0x01 0x04 0x24 0x02 0x02 0x05 0x24 0x06 0x00 0x01 0x07 0x05 0x81 0x03 0x08 0x00 0x10 0x09 0x04 0x01 0x00 0x02 0x0a 0x00 0x00 0x00 0x07 0x05 0x02 0x02 0x40 0x00 0x00 0x07 0x05 0x82 0x02 0x40 0x00 0x00 0x00 0x00 ----------Raw-Data-End---------- xxx

Jul 19, 2023 3:49am Chris Hall (132) 3554 posts	or is there another way to exchange data? I was using BASIC to read GPS data from the UART serial port using SYS “OS_SerialOp” but had the same trouble if I tried to use Serial_USB and the block drivers to read from a USB-connected GPS unit which had a non-supported serial port implementation. I also wanted to make it work even if the unit was unplugged and replugged (which re-enumaerates it). The lines below might help, as reported in Archive 26:3. Simply replace this line: 2370 SYS “OS_SerialOp”,4,-1 TO ,r1% ;r2% 2380 if%+=1 2390 IF (r2% AND 2)=0 THEN which sets bit 1 of r2% if a character is received in r1% from the UART with these lines: 2361 SYS “XOS_ReadVarVal”,“USB$Device_02_00_00”,,-1 TO ,,usbdev% 2362 IF usbdev% THEN 2363 r4%=-1 2364 SYS “XOS_ReadVarVal”,“USB$Device_02_00_00”,qbuf%,256,0 TO ,,r2%,r3%,r4% 2365 IF r4%=0 THEN qbuf%?r2%=13:tusb%=VAL($qbuf%) ELSE tusb%=-1 2366 IF nusb%<>tusb% THEN 2367 REM close prev stream 2368 IF fusb% THEN CLOSE#fusb%:fusb%=0 2369 IF tusb%>0 THEN 2370 REM open new stream 2371 fusb%=OPENIN(“USB”+STR$(tusb%)+“#baud=9600;data=8;stop=1;noparity; nohandshake;noblock:”) 2372 nusb%=tusb% 2373 ENDIF 2374 ENDIF 2375 IF nusb%=tusb% THEN 2376 REM read bytes -trap errors 2377 LOCAL ERROR 2378 ON ERROR LOCAL CLOSE#fusb%:fusb%=0:r1%=0:r2%=2 2379 IF fusb% THEN 2380 SYS “OS_GBPB”,4,fusb%,ssbuf%,1 TO ,,fend% 2381 IF ssbuf%=fend% THEN r1%=0:r2%=2 ELSE r1%=?ssbuf%:r2%=0 2382 ELSE 2383 r1%=0:r2%=2:serialOK%=FALSE 2384 ENDIF 2385 RESTORE ERROR 2386 ENDIF 2391 ELSE 2392 SYS “OS_SerialOp”,4,-1 TO ,r1% ;r2% 2393 ENDIF 2394 if%+=1 2395 IF (r2% AND 2)=0 THEN which does the same but uses a USB-connected GPS unit if present

Jul 19, 2023 10:50am Jean-Michel BRUCK (3009) 351 posts	From Colin Granville SerialUSB module specification: It supports the following USB serial devices: CH340 CP210x PL2303 FTDI changes CP2102N device added. CDC device added. The pico cannot be recognized as a serial interface, I think? And more, the use of a virtual port with the CDC protocol? This is a question for Colin who has already done a lot for the use of USB under Risc OS.

Jul 23, 2023 12:59am Detlef Froehlich (9715) 4 posts	Thanks for your information and code examples! I’m just testing a version of the SerialUSB module Colin Granville has kindly adapted to recognize the virtual serial interface used by PicoMite.

Aug 2, 2023 10:45pm Detlef Froehlich (9715) 4 posts	A quick update on this topic: Colin Granville is putting a lot of work into customizing and testing SerialUSB and Hearsay to make the PicoMite usable under RISC OS. The current state is already excellent.