• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 97 subscribers
  • Views 204 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

addressing TMDXEVM8148 GPIO LEDs

Simon Barnes
Intellectual 360 points
Other Parts Discussed in Thread: TMS320DM8148

from the schematic I've traced the user LEDs to the PCF8575PWR I2C AND SMBus I/O EXPANDER chip on I2C0 of the processor, however the TMS320DM8148 data sheet describes a dizzying number of registers occupying a 4K address space for the I2C channel with no indication of how it actually works. Also the other pins on the chip control all sorts of other stuff which I wouldn't want to accidentally disturb.

I notice that addresses 0x48028000-8fff aren't mentioned in DM8148_EVM.gel so perhaps I can blast away at the port harmlessly once I've found out how to ?

PS it's a shame the leds are not mounted on the edge of the card so they're visible as now I'll have to buy a hand mirror to be able to see them from my desk :(

  • 0
    Intellectual 360 points

    it would appear there are 2 PDFs for the processor:

    a) TMS320DM814x DaVinci™ Digital Media Processors SPRS647C (2MB)

    b) TMS320DM814x DaVinci Digital Video Processors SPRUGZ8B (16MB)

    and they don't seem to agree on the base address for IC20, a says 0x48028000 b says 0x4802 9000 but I cannot be sure they're referring to the same thing as the latter says 64 bytes of address space, oh, peripheral and support registers...