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LM3S6918

raminaann

i am working with LM3S6918 controller .i need to enable port D pin as input and make changes .I am not able to understand how to do it?

  • 0 Arm Employee Badge

    Hi,

    - download and read the programming manual
    - enable Clocks for Peripheral GPIO-D in APB2ENR (I think it's names SYSCTRL on LMI)
    - enable GPIO-D in GPIO Registers
    - set Data Direction to INPUT in GPIO Registers
    - read from GPIO data register

    Do not forget to wait a while between Peri Clock Enable and the first peripheral Reg. write. If the wait loop is too short and you write to the peripheral before it's Clock is stable you will run into a hard fault (it's a good idea to set a BP there to detect this problem).

    BR,
    /th.

  • 0 in reply to Thorsten de Buhr

    i have enable clock for peripheral GPIO-D register.By default all pins are inputs.After that if i change the input pin to 0/1 i am getting oxof.