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RM48L952: RM48L952ZWT USB device

Anila Soomro
Intellectual 570 points

Part Number: RM48L952

Hi

I am using RM48L952ZWT as a USB device.

I want to ask what should be the packet size in bytes while transferring data from RM48 to a host PC.

On PC, the device appears as a virtual COM port after installing the usb_cdc_example driver, what should be the baud rate for VCP? Can it be changed?

What should be the Rx packet size in bytes on RM48?

Regards

Anila

  • 0
    TI__Guru**** 199286 points

    Hello Anila,

    The micro (or mini) USB connector on HDK or launchpad is used for JTAG and virtual COM. The baudrate and packet size should be defined by your code that transmits SCI data. If you use ymodem protocol, the packet size is 128Bytes or 1024Bytes.

  • 0 in reply to QJ Wang
    Intellectual 570 points

    Hi

    This is the link i am following

    Using this example, what should be the packet size in bytes on RM48?

    What should be the baud rate on pc windows7 for this device? Does the baud rate matter?

    Sending 70 bytes from pc to RM48 makes the device unattached after sending 25 packets, so i reduced the packet size on pc to 64 and it works fine.

    Regards

    Anila

  • 0 in reply to Anila Soomro
    TI__Guru**** 199286 points
    Hello Anila,

    It is a "virtual" COM. The packet size is up to 255 bytes. The MCU USB provides full speed (12mbps), but I didn't test the speed of virtual COM using the CDC driver.