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Linux/TDA2: how to enable uart2 on linux os of ti sdk

Qingyun Dong
Prodigy 40 points
Part Number: TDA2

Tool/software: Linux

Hi, 

I'm newbie to use TI's tda2xx evm board with Vision SDK. I am using linux os with tda2xx_evm_linux_all config. After I added PlatformUART2SetPinMux() in Bsp_boardTda2xxInit(), I am able to send strings with uart2 by typing "echo 123 > /dev/ttyS1" in uart1 terminal. The correct waveform on uart2 tx can be seen on the oscilloscope. Then I connected uart2 rx to uart2 tx, sent a string by "echo 123 > /dev/ttyS1" , then "cat /dev/ttyS1": I got nothing. Seems nothing is recieved from uart2. 

Did I miss anything to use uart2 on linux? Is there documents about my issue?

thanks very much.

Dong

  • 0
    TI__Expert 8250 points
    Hi
    It is unclear where you want to control the UART instance from and the overall intent of what you are trying to implement
    Can you be more specific in terms of the resource usage from Linux vs BIOS
  • 0 in reply to Srirama Govindarajan
    Prodigy 40 points
    Hi,
    I want to verify UART2 function first in whichever method, so I take /dev/ttyS1 using Linux os. The final goal is to use LIN bus through UART2. The resource usage from Linux vs BIOS is not considered yet.
    Currently my problem is that UART2 data can't be received by "cat /dev/ttyS1".
    If TI has no support about UART2 on Linux os (tda2xx_evm_linux_all config), any other guide to quickly verify UART2 using Vision SDK(PROCESSOR_SDK_VISION_03_01_00_00) is appreciated.
  • 0 in reply to Qingyun Dong
    Prodigy 40 points
    It seems that the pin mux register setting of uart2 is not correct: the
    macro CTRL_CORE_PAD_UART2_RXD_UART2_RXD_MUXMODE_UART2_RXD_0 in PlatformUART2SetPinMux() function does not match what's described in tda2x manual about UART2_RXD_MUXMODE. (P5149, TDA2x SoC for Advanced Driver Assistance Systems (ADAS), Silicon Revision 2.0, 1.x Texas Instruments ADAS Family of Products, Technical Reference Manual)
    After I change CTRL_CORE_PAD_UART2_RXD_UART2_RXD_MUXMODE_UART2_RXD_0 to CTRL_CORE_PAD_UART2_RXD_UART2_RXD_MUXMODE_UART2_RXD_4, uart2 rx function is correct.
    Please fix this bug in TI VISION SDK in case other developers using uart2 are having the same problem. Thanks!