• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 45 subscribers
  • Views 2772 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

Interfacing the ADS8364 to the TMS320F2812 DSP

PabloAC
Prodigy 20 points
Other Parts Discussed in Thread: ADS8364

Hi All,

I have the EZDSP F2812 and the ADS8364/65 EVM to use that with the example in the www.ti.com and improve the ADC conversion.

Checking the slaa163.pdf you can fin this:

 

and checking the table:

Questions:

-The "IS (NEGATIVE) PIN" in the C28XX (in this case F2812) doesn´t appear in the table and it doesn´t appear in the schematics documents.Could you tell me the name of the pin in the F2812 DSP?

-The IOPA4, IOPA2, IPOA3 don´t appear in the F2812 document, checking the pins in the table you can see it as GPIOA4,GPIOA2,GPIOA3... seems coherent.

- The EA12, EA14, EA15 in the figure associated with C28XX don´t appear in the F2812 document and it doesn´t appear in the table above. Could you tell me the pin´s?

Checking the slaa163.zip you can find the C program associated with this ADC interface and I found W17 (ADS8364_2812.h) as openned but in my case it should be W6 becasue I am not using this slau084.pdf. Could I have W6 jumper openned?

 

Thanks in advance,

 

Pablo

 

 

  • 0
    TI__Guru**** 173096 points

    Hi Pablo,

    PabloAC said:
    -The "IS (NEGATIVE) PIN" in the C28XX (in this case F2812) doesn´t appear in the table and it doesn´t appear in the schematics documents.Could you tell me the name of the pin in the F2812 DSP?

    There is another board in the mix here that makes this a little confusing.  The HPA-MCU Interface Board was providing the connections between the eZdsp and the ADS8364/65 EVM hardware.  The /OE in the figure above is derived from a 3-way jumper option on that board (W1) which connects to P2 pins 38, 39 or 40  on the TMS320F2812 eZdsp board.  These signals are XZCS2n, XZCS0AND1n and ISn as defined in the documentation from Spectrum Digital.  To make things even more confusing (unfortunately) the ISn signal on the F2812 eZdsp is connected to a pull up resistor.  This is actually a signal that was in the F24xx DSPs and it was carried over on the F2812 hardware to maintain some compatibility.

    PabloAC said:
    -The IOPA4, IOPA2, IPOA3 don´t appear in the F2812 document, checking the pins in the table you can see it as GPIOA4,GPIOA2,GPIOA3... seems coherent.

    This nomenclature actually came from the F2407eZdsp, which is where I started with the application note.  Thank you for pointing this out!  I will look into doing an update to that diagram.

    PabloAC said:
    - The EA12, EA14, EA15 in the figure associated with C28XX don´t appear in the F2812 document and it doesn´t appear in the table above. Could you tell me the pin´s?

    EA12, EA13, EA14 and EA15 would map to the address bus of the F2812 - pins XA12-XA15 respectively.

    PabloAC said:
    Checking the slaa163.zip you can find the C program associated with this ADC interface and I found W17 (ADS8364_2812.h) as openned but in my case it should be W6 becasue I am not using this slau084.pdf. Could I have W6 jumper openned?

    W17 from slau084 is actually associated with SW1B on the HPA-MCU Interface Card.  There is a 4-bit 1-of-2 MUX switch on that hardware that allows you to select address lines 12 through 15 or 2 through 5 of the F2812.  Jumper W6 on the ADS8364/65 board allows you to direct the address pins on the ADC to either the DSPs address bus or to the 'manual address' jumpers (W4) on the EVM.  If you remove W6, you can manually control the state of pins A0/A1/A2 with the jumper block W4 - leaving them all off for instance should put the ADC into FIFO mode.

    Hopefully that helps you out a little - please let me know if you need further assistance.