EG915U with Linux version 4.1.15

robert77 · July 12, 2024, 2:45pm

Hi,

I have a USB communication problem with the EG915 module, it is connected, I see the USB ports but I am unable to launch the AT commands with minicom on any of the 7 USB ports

dmesg
[ 2.108956] usb 1-1.3: new high-speed USB device number 3 using ci_hdrc
[ 2.240226] usb 1-1.3: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 32, changing to 9
[ 2.255356] option 1-1.3:1.0: GSM modem (1-port) converter detected
[ 2.263131] option 1-1.3:1.1: GSM modem (1-port) converter detected
[ 2.270905] option 1-1.3:1.2: GSM modem (1-port) converter detected
[ 2.277691] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB2
[ 2.286682] option 1-1.3:1.3: GSM modem (1-port) converter detected
[ 2.293428] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB3
[ 2.301897] option 1-1.3:1.4: GSM modem (1-port) converter detected
[ 2.307751] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB4
[ 2.315084] option 1-1.3:1.5: GSM modem (1-port) converter detected
[ 2.321017] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB5
[ 2.328323] option 1-1.3:1.6: GSM modem (1-port) converter detected
[ 2.334312] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB6
[ 2.341702] option 1-1.3:1.7: GSM modem (1-port) converter detected
[ 2.347560] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB7
[ 2.355077] option 1-1.3:1.8: GSM modem (1-port) converter detected
[ 2.361054] usb 1-1.3: GSM modem (1-port) converter now attached to ttyUSB8

and

lsusb -v

Bus 001 Device 003: ID 2c7c:0901
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x2c7c
idProduct 0x0901
bcdDevice 3.18
iManufacturer 1 Android
iProduct 2 Android
iSerial 3
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 263
bNumInterfaces 9
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 400mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 2
bFunctionClass 2
bFunctionSubClass 6
bFunctionProtocol 0
iFunction 4 CDC Ethernet Control Modle (ECM)
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 2
bInterfaceSubClass 6
bInterfaceProtocol 0
iInterface 6 CDC ECM
CDC Header:
bcdCDC 1.10
CDC Union:
bMasterInterface 0
bSlaveInterface 1
CDC Ethernet:
iMacAddress 7 024bb3b9ebe5
bmEthernetStatistics 0x00000000
wMaxSegmentSize 1514
wNumberMCFilters 0x0000
bNumberPowerFilters 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0010 1x 16 bytes
bInterval 32
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 10
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 10
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 5 CDC Ethernet Data
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 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 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 16
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x85 EP 5 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 4
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x86 EP 6 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 5
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x87 EP 7 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 6
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x88 EP 8 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 7
bAlternateSetting 0
bNumEndpoints 3
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8a EP 10 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x07 EP 7 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x89 EP 9 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 16
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 8
bAlternateSetting 0
bNumEndpoints 2
bInterfaceClass 255
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 8 Mobile Generic Serial
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x8b EP 11 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x08 EP 8 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
can’t get debug descriptor: Resource temporarily unavailable

Thank you
R.

Bean.Wang-Q · July 12, 2024, 3:07pm

You can send AT command via ttyUSB2 and ttyUSB7.

robert77 · July 12, 2024, 3:14pm

Hi,
with minicom /dev/ttyUSB2 /dev/ttyUSB7 115200 8N1
I have no answer
I only after a while: random: nonblocking pool is initialized
Thank you
R.

robert77 · July 12, 2024, 3:25pm

Hi,
i managed to communicate, can you tell me the USB port for PPP?
Thank you
R.

Bean.Wang-Q · July 13, 2024, 7:32am

Is it Ubuntu?
Yes it support PPP and can use the AT port.

robert77 · July 13, 2024, 9:27am

Hi,
Linux Yocto

I need 2 usb ports, one for diagnostics with AT commands and the other for PPP, currently we use EG912Y in this way, we have changed the hardware design to use EG915 and also EG916Y

Bean.Wang-Q · July 13, 2024, 12:25pm

EG915U also has two usb port for AT command and one of them can be used for ppp.