Digispark Pro with SD card breakout board (SPI) - Transaction Functions

[yelleagle]

tl;dr: Current question: Is there a hardware reason the transaction functions for SPI is missing? Or would slight modifications of the Arduino SPISettings and transaction functions be able to solve the problem?

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Hi,

So I'm currently working on a project that records voltages from a potentiometer to an SD card. I have this SD card breakout board. adafruit.com/products/254 and am currently using the Digispark Pro. I followed the instructions in the adafruit tutorial and used the SD examples in the IDE to get a datalogger code written.

The code compiles if the board is set as the Arduino Uno, but not the Digispark Pro. The following error popped up:

In file included from C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/utility/Sd2Card.h:26:0,
                 from C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/utility/SdFat.h:29,
                 from C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/SD.h:20,
                 from sketch_apr04a.ino:2:
C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/utility/Sd2PinMap.h:300:5: error: 'DDRD' was not declared in this scope
   {&DDRD, &PIND, &PORTD, 0},  // D0  0
     ^
C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/utility/Sd2PinMap.h:300:12: error: 'PIND' was not declared in this scope
   {&DDRD, &PIND, &PORTD, 0},  // D0  0
            ^
C:\Program Files (x86)\Digistump_Arduino\libraries\SD\src/utility/Sd2PinMap.h:300:19: error: 'PORTD' was not declared in this scope
   {&DDRD, &PIND, &PORTD, 0},  // D0  0
                   ^

I went into the Sd2PinMap.h header file and realized it was a list of digital pin maps that didn't include the ATTiny167's pin map, but only the ATmegas. I also couldn't track down where the variables "DDRA," "DDRB," etc. were declared in even an Arduino Uno board. Would someone be able to point me to the right direction in terms of how to fix this error? Or maybe direct me to an easier way to program the SD card to write?

[defragster]

I don't see a wiki for the SD card on Pro - but that is an SPI device - like the nRF24 shield is.  If you compare your wiring to that you may find the needed pins.  I don't know the status of it working after that on the Pro's RAM and code space.

=spi]http://digistump.com/wiki/digispark/tutorials/pronrf?s[]=spi

[yelleagle]

Thanks for the response. I got the digita pin map working by modifying the library to match the pins of an ATTiny 167. However, SPI transaction errors popped up.

I'm currently referring to the SPI library for both an Arduino and the Digispark Pro, and the transaction functions (including the SPISettings and the begin/end transaction functions) are missing. Is there a reason in hardware-wise that that's so? And if yes, is there any specific modifications that the library need to get it through (instead of just copy and pasting)?

[defragster]

As I gathered from another forum: .begin and .end are new design SPI change for Arduino and the Pro port must have happened before that. Digistump/author of the Pro work would have to speak to SPI and if SD can work. 

I'd be surprised if it worked - at least in any conventional way - as the directory data and parsing alone would take more ram than the Pro has.

You should maybe start with logging to EEProm either onboard or: http://digistump.com/products/28

[digistump]

The newest release (coming out now) has the newest SPI libraries