[SOLVED] Help mapping pins in pins_arduino.h?

Using Arduino Programming Questions
1

Hi, I'm setting up an ATMEGA1284p and have produced/edited a pins_arduino.h file to corresond with my hardware connections. It all seems to work other than using the SD library, I have verified the hardware is working so I'm pretty sure I have made an error in the pins file.

Does anybody know their was around the pins_arduino.h structure and would be willing to take a look at what I have done?

Thanks

2

Whats the problem with using the pins_arduino.h thats part of the core ?

3

I'm just keen to learn how it all works, I've made the PCB and now very close to getting it working :slight_smile:

4

I have a 1284P PCB on the bench here, that has an SD card on it too, but I wont need to be changing the pins_arduino.h at all, I just use the Bobuino pinout in the IDE.

Its never occured to me to change the standard pinouts to suit a PCB.

5

I've never heard of bobuino, I will take a look - thanks.

6

So bobuino maps the SPI pins to D10,11,12,13 which does work with the SD library, my pins-arduino.h file maps the SPI pins to D4,5,6,7 which doesn't work - I'm now wondering if my maping file is right but there is something upstream in the SD library which isn't seeing the correct pins even though I have them defined as SS,MOSI,MISO and SCK as per usual and setting SS pin to D4 as expected - a bit odd?

7

Whatever number the Arduino IDE uses for the hardware SPI pins, SCK (PB7) MISO (PB6) , MOSI (PB5) makes no difference these pins are fixed on the ATmega1284P they cannot be mapped to other ATmega1284P pins.

And the IDE might assume a default for SS, but that makes no difference either, the SS pin can be defined as any other available pin.

8

Hmmm, its very odd - thanks for helping out. I have PB4, PB5, PB6, PB7 mapped to D4, D5, D6, D7 and defines as SS, MOSI, MISO and SCK but the SD library only works with the bobino pins_arduino.h map which defines the same pins as D10, D11, D12 and D13. If I uses the SdFat library it works with my pin mapping so I guess it must be somehting in the SD library code?

9

Hi, I've just tried the Adafruit branch of the SD library which works as expected so there must be something up with the original SD library - lots of hunting but got there in the end :slight_smile:

10

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