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GPIO as RS422

Vimal Gupta
Intellectual 450 points

Hi,

I want to use GPIO pins as RS422 but could not able to get idea to read Rs422 from GPIO pin.

Can u suggest me how can i read GPIO pin as Rs422 using C code.

I am using 8148 processor.

Regards,

Vimal

  • 0
    TI__Guru**** 170625 points

    Vimal,

    Please refer to the below wiki page:

    http://processors.wiki.ti.com/index.php/TI81XX_PSP_GPIO_Driver_User_Guide

    Regards,
    Pavel

  • 0 in reply to Pavel Botev
    Intellectual 450 points

    Hi Pavel,

    Thanks for the provided link, which has given me the useful information on gpio but still my question remain same.

    let me explain you in details about my query.

    I have connected an RS422 line on a gpio to receive the data transferred from other side say "ABCDEFGH" and also want to transfer the data to other side say "IJKLMNOPQ".

    How can i achieve it.

    I know that the toggling can be done by setting the value to 0 or 1 and same can be read from gpio, but how to read and write the data from/to gpio.

    a little bit of code snippet will be useful if provided.

    thanks.

  • 0 in reply to Vimal Gupta
    TI__Guru**** 170625 points

    Vimal,

    I would recommend you to check:

    DM814x TRM, chapter 10 GPIO, sections
    10.2.4.2 Set and Clear Instructions
    10.2.4.3 Data Input (Capture)/Output (Drive)

    Wiki page:
    http://processors.wiki.ti.com/index.php/General_Purpose_IO_%28GPIO%29_FAQ_for_C2000

    GPIO C test code from Mistral:

    http://www.mistralsolutions.com/pes-support/support-downloads/tmdxevm8148.html#

    Software -> Diagnostic Software -> Expansion I/O board

    IO_EXPANSION_BOARD_Rev_D.zip -> IO EXPANSION BOARD Rev D/src/CCS_Test_Code/IOExpansion_Application/

    lcd_interposer_touch/ocular_touch.c
    Bluetooth/bluetooth.c
    wlan/sdmmc.c
    UART0/uart_loopback_test.c

    ti-ezsdk_dm814x-evm_5_05_02_00/board-support/u-boot-2010.06-psp04.04.00.01/board/ti/ti8168/evm.c -> voltage_scale_init(void)

    Best Regards,
    Pavel