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AMIC110: UART module reset

Raja Koteswara Rao
Intellectual 530 points

Part Number: AMIC110

Hello,

Is it compulsory to reset the UART module during initialisation ?

I checked UART driver code, the driver is not doing it , but when I checked bare metal examples they are resetting the UART module.

  • 0
    TI__Mastermind 29645 points

    Raja

    A software reset can be performed to clear the UART registers, the procedure is in the TRM (SPRUH73Q - Section 19.4.1.1.1). This is always a good idea so you have a consistent baseline before applying an application specific configuration. 

    I'm not a s/w expert, but it is possible that the Linux(?) driver resets the UART elsewhere.

    The bare metal code UART developer may have wanted to start from a known baseline configuration and hence the s/w reset before configuring. 

    --Paul 

  • 0 in reply to PaulM
    Intellectual 530 points

    Hello ,

    The UART driver I referred to was from pdk_am335x_1_0_17 (TI-RTOS) and Bare metal example provided by Starterware. The example code or UART APIs provided in the TI-RTOS doesn't perform UART module reset.

    Since, application will be using TI-RTOS provided APIs, we need confirmation from the TI-RTOS team on whether it should be performed or it's already taken care [may be I'm missing something]. Could you notify the TI-RTOS team for the same ?

    Thanks & Regards,

    Raja

  • 0 in reply to Raja Koteswara Rao
    TI__Mastermind 29645 points

    Raja

    I'll transfer the ticket to someone in the s/w team. 

    --Paul

  • 0 in reply to PaulM
    TI__Guru** 108960 points

    Hello Raja,

    The engineer who owns this thread is unable to reply this week due to the winter storms in Texas. They will give a response next week.

    Regards,

    Nick

  • 0 in reply to Raja Koteswara Rao
    TI__Mastermind 33590 points

    Hi Raja,

    The API UARTModuleReset in csl is doing the reset sequence required (similar to starterware).
    I am checking why driver doesn't do this or if it expects this operation to be done by some other component.

    Regards,
    Vishal