La connexion d’un pyboard via USB donne "Impossible de saisir le port (tty / ttyACM0)"
Lorsque je connecte un micropython (carte de microprocesseur de type Arduino) via USB, cela fonctionne très bien comme système de fichiers USB, mais je ne peux pas l'utiliser comme TTY.
J'utilise Ubuntu 14.4 64 bits.
Lorsque je branche le périphérique, je reçois ceci dans syslog:
Jun 20 22:01:24 halob ModemManager[801]: <info> Creating modem with plugin 'Generic' and '1' ports
Jun 20 22:01:24 halob ModemManager[801]: <warn> Could not grab port (tty/ttyACM0): 'Cannot add port 'tty/ttyACM0', unhandled serial type'
Jun 20 22:01:24 halob ModemManager[801]: <warn> Couldn't create modem for device at '/sys/devices/pci0000:00/0000:00:1c.3/0000:04:00.0/usb3/3-2': Failed to find primary AT port
la sortie de lusb -v ressemble à ceci:
Bus 003 Device 050: ID f055:9800
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0xf055
idProduct 0x9800
bcdDevice 2.00
iManufacturer 1 Micro Python
iProduct 2 Pyboard Virtual Comm Port in FS Mode
iSerial 3 000000000011
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 98
bNumInterfaces 3
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 1
bInterfaceCount 2
bFunctionClass 0 (Defined at Interface level)
bFunctionSubClass 0
bFunctionProtocol 0
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2 Communications
bInterfaceSubClass 2 Abstract (modem)
bInterfaceProtocol 1 AT-commands (v.25ter)
iInterface 0
CDC Header:
bcdCDC 1.10
CDC Call Management:
bmCapabilities 0x00
bDataInterface 2
CDC ACM:
bmCapabilities 0x02
line coding and serial state
CDC Union:
bMasterInterface 1
bSlaveInterface 2
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 32
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 10 CDC Data
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 8 Mass Storage
bInterfaceSubClass 6 SCSI
bInterfaceProtocol 80 Bulk-Only
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
J'ai créé un fichier /etc/udev/rules.d/49-micropython.rules avec le contenu suivant:
# f055:9800 - MicroPython board
ATTRS{idVendor}=="f055", ATTRS{idProduct}=="9800", ENV{ID_MM_DEVICE_IGNORE}="1"
ATTRS{idVendor}=="f055", ATTRS{idProduct}=="9800", ENV{MTP_NO_PROBE}="1"
SUBSYSTEMS=="usb", ATTRS{idVendor}=="f055", ATTRS{idProduct}=="9800", MODE:="0666"
KERNEL=="ttyACM*", ATTRS{idVendor}=="f055", ATTRS{idProduct}=="9800", MODE:="0666"
et puis j'ai exécuté:
Sudo udevadm control --reload-rules
puis débranché et rebranché le câble USB allant à la carte Micropython.
Cela fonctionne pour moi sous 14.04