• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 98 subscribers
  • Views 403 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.

C5515 External Bus Selection

Simon Attard
Intellectual 775 points
Other Parts Discussed in Thread: TMS320C5515

Hi all,

 

I am using C5515 DSP to interface to several external modules. Basically I need UART, SPI, I2S1, I2C and some GPIO pins. Specifically, I need GPIO 5 to act as an output pin. In order to obtain this functionality, I set the External Bus Selection Register (0x1C00) to 0x1600.

This means:

PPMODE = Mode 1 (SPI, GPIO, UART, and I2S2)

SP1MODE = Mode 1 (I2S1 and GP[11:10])

SP0MODE = Mode 2 (GP[5:0])

When I use these settings, I2S1 does not work properly. All the value received are 0. If I set SP0MODE = Mode 0, then everything works fine (except that I cannot use GPIO 5).

What am I missing here? Any help please?

Thanks.

Simon

P.S. I am using a TMS320C5515 EVM board.

  • 0
    TI__Mastermind 30140 points

    Hi Simon,

    Are you using the CSL?

    Once the problem is happening, check the state of PCGCR, EBSR, and peripheral registers... Are they set as expected?

    Regards,
    Mark

  • 0 in reply to Mark M
    Intellectual 775 points

    Hi Mark,

    I am using the CSL in some parts of the code, Eg. to initialise the I2S. But I am not using the CSL to change the EBSR.

    I have checked the state of PCGCR, EBSR and the I2S1 registers, and they are all set correctly.

    Can it be something to do specifically with the EVM board? I tried to find if there were some jumper settings to maybe disable the SD Card connector external circuitry, but I could not find anything relevant...

    Thanks a lot for your help so far.

     

    Simon

  • 0 in reply to Simon Attard
    TI__Mastermind 30140 points

    Simon,

    I quickly checked the C5515 EVM schematics, and the Serial Port 0 pins only go to the MMC/SD card connector and a couple of headers - anything attached to headers J13, P1, or P2?

    Is there an SD card present in the slot? MMC0.WP and MMC0.INS do connect to Serial Port 1 I2S1 pins...

    Do you have an external source driving data into I2S1? You said you get data on I2S1 when GP[5] is not routed from SP0... Is that external device dependent on any GPIO or other pin? The codec on the C5515 EVM is connected to I2S2 only.

    Regards,
    Mark

  • 0 in reply to Mark M
    Intellectual 775 points

    Hi Mark,

    Thanks to your points and questions, I managed to arrive to the solution. The problem I had was that GPIO 4 was connected to the Audio codec reset pin. In my code there was a toggle of GPIO 4 (which was not working when SP0MODE was MODE 0). When I set SP0MODE = 2, GPIO 4 was routed to SP0 and thus the Audio codec was being reset!

    Thank you once again for your help!

     

    Regards,

     

    Simon