Reply To: SDconflict Gameduino2 and Sparkfun MP3 shield

[Michael P. Flaga]

Referring to http://excamera.com/sphinx/gameduino2/ and http://cdn.sparkfun.com/datasheets/Dev/Arduino/Shields/MP3%20Shield-v13.pdf

There are several pins that are attempting being used by both shields.

refer to http://www.billporter.info/forum/topic/host-running-less-than-16mhz/#post-3309 they had similiar pin conflicts

 

Gameduino2

11inSPI MOSI
12outSPI MISO
13inSPI SCK
8inGPU SEL*
9inSD SEL*
2outINTERRUPT*
A2outACCEL_Z
A1outACCEL_Y
A0outACCEL_X

 

vs the SFEMP3Shield

2  out MP3-DREQ*
3  in  MIDI RX
4  in  GPIO1
6  in  MP3-CS
7  in  MP3-DCS
8  in  MP3-RST*
9  in  SD-CS*
11inSPI MOSI
12outSPI MISO
13inSPI SCK

it is OK for MOSI,MISO and SCK to share.

But rest 2, 8 and 9 are problems you will need to over come.

 

In this case:

Both shields are Wired to use INT0 on D2. The MP3 uses it as an interrupt. Not sure if the G2 does. Its code is very extensive. and I see it is not well documented as to changing its pins.

Refer to https://www.youtube.com/watch?v=behMgV3tUr4 it explains how to move pins. Also refer to http://www.freetronics.com.au/pages/stacking-arduino-shields.

 

The SFEMP3 has all its pins defined in the SFEMP3ShieldConfig.h. You can easily specify any changes you make.

 

I would move the SFEMP3’s D2 to D3. Then make sure that SJ2 is open. MIDI-RX is not needed and we don’t want it to interfere. Then move SD-CS from D9 to D10 and move MP3-RST from D8 to A3.

Then update SFEMP3ShieldConfig.h correspondingly. That should remove any conflicts.