RE: Portenta H7 - Expansion Port

Official Hardware Portenta Family Portenta H7
1

Hi @pert I understood the usage of high density connectors, but can I connect a sd module avoiding the usage o an external board?
I mean that I have a pololu microsd board (item 2587) And I connect it to an arduino uno :
SCLK on the MicroSD breakout board to SCK (pin 13) on the Arduino Uno.
DO on the MicroSD breakout board to MISO (pin 12) on the Arduino Uno.
DI on the MicroSD breakout board to MOSI (pin 11) on the Arduino Uno.
CS on the MicroSD breakout board to pin 4.
Vdd-5V, GND-GND
the library is Arduino SD library

I tried doing the same stuff with portenta using pins 7, 8, 9, and 10 as SPI pins CS, MOSI, SCK, and MISO, respectively, but the card is not found.

2

I don't know the pololu microsd. But if i look on the schematic, it seems that this module needs a 5V supply on VDD. But the Portenta doesn't provide a 5V output. How did you connect the module to the Portenta?

I get the schematic from here

grafik
grafik1200×830 51.8 KB

3

Thank you for your disponibility @eschi I thought yes honestly, but I can be wrong. Anyway I used 5V, GND, D10,D9,D8,D7 and it doesn't work (in Arduino it works)

Portenta
Portenta842×605 316 KB

4

Yes, you are right. And since the 5 volts are downconverted to 3.3V it should work fine. I think then I can't help you :sweat_smile: Maybe a problem in your code?