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DM8148 GPIO peripheral registers

John Pruitt
Prodigy 190 points
Other Parts Discussed in Thread: TMS320DM8148

I am using a DM8148 on a mistral evm board. The documentation (http://focus.ti.com/lit/ds/symlink/tms320dm8148.pdf) indicates that the GPIO_REVISION register should be at 0x48032000. When I try to read this location, I get a bus error. Is the documented address of GPIO_REVISION incorrect? Is initialization needed before trying to read the GPIO_REVISION register?

 

Thanks.

 

  • 0
    Prodigy 190 points

    I received a suggestion that the PRCM may not be set up correctly. I tried this using address for the 8168 and got the address range for GPIO_0 and GPIO_1 to work. My question now is whether there is any documentation for the 8148 and prcm. Particularly for the GPIO and the DCAN peripherals.

    I think I want the user guide referred to in:

     

    For more details on the PRCM, see the TMS320DM814x Power, Reset and Clock Management (PRCM)
    Module User's Guide (Literature Number: TBD).

     

    Thanks.

     

  • 0 in reply to John Pruitt
    Prodigy 190 points

    GPIO_0 is the same as for the 8168. PRCM_BASE + 0x155c

     

    For the 8148, the DCANs (0 and 1) are turned on by PRCM_BASE+0x1618

  • 0 in reply to John Pruitt
    Intellectual 300 points

    Hi John,

    Did you manage to get the GPIO working on 8148? and how did you do it?

    Please help.

    Thank you in advance.

  • 0 in reply to Mohamed Osama
    Prodigy 190 points

     /* PRCM Base Address */
    #define PRCM_BASE            0x48180000  

    #define CM_ALWON_GPIO_0_CLKCTRL        (PRCM_BASE + 0x155c)
    #define CM_ALWON_GPIO_1_CLKCTRL        (PRCM_BASE + 0x1560)

    out32(CM_ALWON_GPIO_0_CLKCTRL, 2);
        out32(CM_ALWON_GPIO_1_CLKCTRL, 2);

    #define DM816X_GPIO0_BASE            0x48032000
    #define DM816X_GPIO1_BASE            0x4804C000

    Before doing this, the GPIO address ranges gave bus errors. After doing this, they worked as expected. It is has been a while but I think the gpio address ranges for the 814x are the same as for the 816x.

    Hope this helps.

     

  • 0 in reply to John Pruitt
    TI__Prodigy 700 points

    John,

    Did you get the "TMS320DM814x Power, Reset and Clock Management (PRCM) Module User's Guide"? Could you please share with us?

    Thanks,

    Bin

  • 0 in reply to Bin Zhou35352
    Prodigy 190 points

    Sorry I cannot help. I never received the manual. I was able to guess at what I needed and never got the full manual to find out if there was anything else I needed to know.