MartinM

Hello, we are using a PMD-1208LS together with a compute module 4 (Raspberry Pi 4). It works, we can do measurement based on the example test-usb1208LS.py. We are using only DA and AD ports. We are using single ended measurements. From time to time the measurement returns a value -1024=-0x400, which is then converted to -10 Volts. We are reading values from multiple channels and all of them return the same value, again and again (even when we restart the test program). When we reboot the Raspberry Pi, the values are correct again. When we disconnect and re-connect the PMD-1208LS, it is also working again. This is what we are using: test@test:/usr/local/bin $ uname -a Linux test 5.15.76-v7l+ #1597 SMP Fri Nov 4 12:14:58 GMT 2022 armv7l GNU/Linux test@test:/usr/local/bin $ Bus 001 Device 006: ID 09db:007a Measurement Computing Corp. PMD-1208LS Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x09db Measurement Computing Corp. idProduct 0x007a PMD-1208LS bcdDevice 1.02 iManufacturer 1 MCC iProduct 2 USB-1208LS iSerial 3 020A93B3 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x0029 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 4 Cfg1 bmAttributes 0x80 (Bus Powered) MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 bInterfaceProtocol 0 iInterface 5 EP1 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.10 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 36 Report Descriptor: (length is 36) Item(Global): Usage Page, data= [ 0x00 0xff ] 65280 (null) Item(Local ): Usage, data= [ 0x01 ] 1 (null) Item(Global): Logical Minimum, data= [ 0x00 ] 0 Item(Global): Logical Maximum, data= [ 0xff 0x00 ] 255 Item(Global): Report Size, data= [ 0x08 ] 8 Item(Main ): Collection, data= [ 0x01 ] 1 Application Item(Local ): Usage, data= [ 0x01 ] 1 (null) Item(Global): Report Count, data= [ 0x08 ] 8 Item(Main ): Input, data= [ 0x02 0x01 ] 258 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Buffered Bytes Item(Local ): Usage, data= [ 0x01 ] 1 (null) Item(Global): Report Count, data= [ 0x08 ] 8 Item(Main ): Output, data= [ 0x02 0x01 ] 258 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Buffered Bytes Item(Local ): Usage, data= [ 0x01 ] 1 (null) Item(Global): Report Count, data= [ 0x68 ] 104 Item(Main ): Feature, data= [ 0x02 0x01 ] 258 Data Variable Absolute No_Wrap Linear Preferred_State No_Null_Position Non_Volatile Buffered Bytes Item(Main ): End Collection, data=none Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x01 EP 1 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 can't get debug descriptor: Resource temporarily unavailable Device Status: 0x0000 (Bus Powered) Any idea what it could be? Is there perhaps a firmware version we can check and perhaps update the firmware? Or can I try something out, when I next time reach this situation? Is there some way to reset the part which could make this problems? We already tried #!/bin/bash for X in /sys/bus/usb/devices/*; do if [ -f $X/idVendor ] && [ $(cat "$X/idVendor") == "09db" ] ; then echo "Resetting device" echo 0 > $X/authorized sleep 1 echo 1 > $X/authorized fi done but this has not helped. Many thanks! Best regards, Martin