Multiple SPI problem

laeeq24laeeq24 pakistan
in Build-it-yourself
Dear OBCI Team;
As we are working on custom cyton board i.e TI ADS1299-EVM board with chipkit dp32 with the openbci bootloader. Now we are trying to record data in sd card and everything is working fine individually but when we attach the ADS1299 and sd card on the same line i.e combining MOSI, MISO, and SCK, we are unable to access the sd card.CS is high for ADS1299 for its high impedance mode but sd card is not working. I tried different SPI speeds but unable to get rid off.  
Kindly give me some suggestions to solve this problem.
Regards
Laeeq

Comments

  • wjcroftwjcroft Mount Shasta, CA
    Have you followed these recommendations?


    Does your SD card itself work on other systems? Are you using the almost identical card reader on the Cyton mainboard?

    Is it possible the EVM board has some odd logic associated with the SPI lines?
  • laeeq24laeeq24 pakistan
    Yes, we are using 10 class Kingston 8 GB card which is working fine alone, i checked it by sending a, L , S, A and it start creating the file according to HEX name in EEPROM. I checked the schematic of EVM board but there is nothing to connected.
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