Arduino Due and HSMCI

Hardware Arduino Due
1

Hi

I'm trying to interface a sd card with the hsmci and my arduino due. Can't find any info on this subject that sheds enough light to see my way through.

My main problem seems to be interfacing the sd the actual arduino board. The hsmci pin out on 3x8e are as follows

PIO_PA20A_MCCDA MCCDA
PIO_PA19A_MCCK MCCK
PIO_PA21A_MCDA0 MCDA0
PIO_PA22A_MCDA1 MCDA1
PIO_PA23A_MCDA2 MCDA2
PIO_PA24A_MCDA3 MCDA3

Found all the needed pin outs bar this one, PIO_PA21A_MCDA0, this one is for LED TX on physical pin 107 so there is no way to connect MCDA0 from the sd card to PIO_PA21A_MCDA0 because the pin is not present.

Is there a solution, am I on the right track here, or is this a limitation of the arduino due?

2

Solder a cable to the PA21 pin from TX ?

An other solution is with a TAIJUINO board with all pins exposed.

3

Thanks ard_newbie. Poor design, I mean come on the designers were faced with either putting an tx led or a pin for hsmci and they decided a led was more important. lol

4

We have the same issue with the Ethernet pins...

This arduino DUE compatible board too has all the 144 pins exposed:

http://vi.raptor.ebaydesc.com/ws/eBayISAPI.dll?ViewItemDescV4&item=222791609560&category=175745&pm=1&ds=0&t=1520738403000&ver=0