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Why GPIO2 mot working?

Coder
Prodigy 140 points
Other Parts Discussed in Thread: AM3358

Hi,

I can control GPIO0 with __raw_writel(), but it doesn't work for GPIO2. When  I write

__raw_writel(0xFFFFFFBF, 0x481AC000+0x134);

The program hangs up. How can I output a high on GPIO2_6? I'm using AM3358. Thanks.

DL

 

  • 0
    TI__Intellectual 2725 points

    1 reason I can think of is that the clock for GPIO2 is not enabled. Or even if the pin-mux for GPIO2 is not properly set

  • 0
    TI__Expert 6655 points

    Hi Coder,

    I think, by default GPIO2 clock is not enabled in u-boot, add these lines to interface_clocks_enable function in "board/ti/am335x/pll.c" file to enable GPIO2 clock.

    /* GPIO2 */
    writel(PRCM_MOD_EN, CM_PER_GPIO2_CLKCTRL);
    while (readl(CM_PER_GPIO2_CLKCTRL) != PRCM_MOD_EN);

    Regards

    AnilKumar

    Please mark this Forum post as answered via the Verify Answer button below if it helps answer your question.  Thanks!

  • 0 in reply to Anil
    Prodigy 140 points

    Thank you, Gururaja and Anil,

    It's just like what you said. After the GPIO2 clock is enabled, the GPIO2 output works. I was totally on a wrong track. Time and time again I learned that most of the problems are in the first order. Don't jump quickly to higher orders.

    Thanks again,

    DL