Posts by daniel.guedel@schurter.com

  • Boot issue after power on

    Good morning,


    We have been having problems starting up the PicoCoreMX8MM on some devices for some time. As it looks at the moment, the peripherals are not initialized properly and the Linux crashes near when initializing the SDHCI (see bootlog in the attachment). Since the PicoCoreMX8MM only needs 5V and generates the 3.3V itself I have the question how it looks like with the 3.3V supply of the external peripherals.


    Are there any specifications regarding the power-on sequence between 5V and external generated 3.3V? The circuit of the power supply was largely taken from the PicoCoreBBDSI (see figure below).




    Many thanks for your answer.


    Kind regards,

    Daniel

    Files

    • bootlog.txt

      (13.75 kB, downloaded 173 times, last: )

  • USB overvoltage protection

    Hello,


    make it sense to leave the VDD pin of the protection circuit open? How will the positive overvoltage discharge without breaking one of the diodes?




    In my opinion the circuit should be something like this.



    Thank you for reply.


    Best regards,

    Daniel

  • Ethernet LED

    Hello,

    how are the ethernet LEDs linked on your new revision of PicoCore MX8MM-V5-LIN to the KSZ9893R ethernet switch?




    With your reference LED1_0 and LED1_1 it seems to be that both LEDs are linked to port 2. I know there is an issue in revision 1.1 but how is it wired physically on Rev. 1.2?


    Thank you for reply.


    Best regards,

    Daniel

  • Voltage VDD_SNVS

    Dear support team,¨


    I'm wondering that I can measure about 4.6V on the power domain VDD_SNVS. This power supply uses a 3.3V LDO regular (as seen in your baseboard schematic). This means that the PicoCoreMX8MM will push the domain with a voltage higher than 3.3V. Is this higher voltage allowed on the output of your LDO regulator? If yes, what type is it and what is the circuit on PicoCoreMX8MM for understanding this issue? My used regulator allows only higher voltages about VDD + 0.3V whereat VDD is not referred anymore in datasheet.






    Thank you for reply.


    Best regards,

    Daniel

  • Signal USB_HOST_PWR

    Hellor,


    I really don't understand this issue. In the documentation of PicoCore MX8MN the pin Signal USB_PWR_A is mentioned as bidirectional.




    I I assume that this signal means VBUS.


    Further on the baseboard schematic, why the USB_HOST_PWR signal is not inverted as the signal USB_OTG_PWR because VBUS_DET pin of the usb hub USB2514 seems to be high-active.






    Thank you for reply.


    Best regards,

    Daniel

  • Connecting RGMII Interface

    Hello,


    connecting an ethernet switch or PHY to PicoCore MX8MM over RGMII poseses some questions. I assume that connection will be equal like documented in PicoCore MX8MN hardware documentation. I guess that connection has to be 1:1 meaning TX and RX lines are not crossed. I guess too that ETH_SW_RST will be an output to reset the ethernet switch and ETH_SW_INTn will be an input to receive interrupt requests from the ethernet switch. Below my understanding of the RGMII interface of MX8MM.



    Thank you for reply.


    Best regards,

    Daniel

  • Is Pin J2-56 SD_A_RST Input or Output?

    Hello,


    In the documentation of PicoCoreMX8MM pin J2-56 in chapter 3.1 is mentioned as input. Below in chapter 4.3 the same pin is mentionend as output. What is the function of this pin?

    The schematic of the baseboard allows interpretation of both, input or output.



    forum.fs-net.de/wcf/index.php?attachment/440/


    In the documentation of PicoCoreMX8MN the same issue but in different chapters.


    Thank you for reply.


    Best regards,

    Daniel

  • Ethernet LED

    Hello,


    what do the ethernet LEDs LED00 and LED01 on PicoCore MX8MN with onboard switch realy indicate? Does Blinker mean link/activity? I cannot find any information about Intel GSW120 ethernet switch on the internet.


    Thank you for quick reply.


    Best regards,

    Daniel



  • PWM Channels

    Hello,




    in the documentation of PicoCore MX8MM or MX8MN are mentioned up to 8 PWM channels. In the GPIO Reference Card I can see only 2 channels PWM1 and PWM2 and PWM2 is reserved for backlight dimming. Where are the other channels mapped to? I need 3 additional pwm channels for brightness control of a RGB LED. This also can be controlled by software PWM.


    Thank you for quick reply.


    Best regards,

    Daniel

  • Change Touch sensitivity for FT5426

    Hello,


    I started with the TFT module MI0700AJT-54CP from the Eval board and I've got a good usability of the PCAP touch panel.


    Now I'm working with a compatible module which uses the same touch controller FT5426 from FocalTech. This module comes with a 3mm cover glass and the sensitivity is programmed by the manufacturer. Normally the usability is good without changge of any parameters by the driver. But with the Eval board the usability is not acceptable. I suppose that the Linux driver writes some for the module MI0700AJT-54CP optimized parameters to the touch controller.


    Can you confirm this and is it possible to write other or no parameters to the touch controller?


    Thank you for help.


    Best regards,

    Daniel

  • Changing the display parameters without building a new kernel

    Dear support team,


    is it possible to change the display settings wihout building a new kernel?


    I've got a custom specific kernel built from F&S for the Endrich TFT (MI0700AJT-54CP) and should connect the efusA9 with a customer specific module with following parameters below.




    In my opinion it could work without change anything. If not, in which file can I change the display parameters?


    Thank you for help.


    Best regards,

    Daniel