SD Card testing

Autonomo
1

I am using the sketches to test a 16gb Fat formatted SD card but the pins returned from the print routine seem different than the ones shown on the schematics of the Autonomo Rev.5

I have changed the sketch to print out the SS_2 and the result is

MOSI 44
MISO 42
SCK 45
SS 46
Initializing SD card...initialization failed!

According to the variant file the code is correct

// SPI
#define PIN_SPI_MISO         (42u)
#define PIN_SPI_SS           (43u)
#define PIN_SPI_MOSI         (44u)
#define PIN_SPI_SCK          (45u)
 
static const uint8_t MISO = PIN_SPI_MISO;
static const uint8_t SS   = PIN_SPI_SS ;
static const uint8_t SS_DFLASH  = PIN_SPI_SS ;
static const uint8_t MOSI = PIN_SPI_MOSI ;
static const uint8_t SCK  = PIN_SPI_SCK ;

// SPI1
#define PIN_SPI1_MISO        (53u)
#define PIN_SPI1_SS          (54u)
#define PIN_SPI1_MOSI        (55u)
#define PIN_SPI1_SCK         (56u)

static const uint8_t MISO1 = PIN_SPI1_MISO;
static const uint8_t SS1   = PIN_SPI1_SS;
static const uint8_t MOSI1 = PIN_SPI1_MOSI;
static const uint8_t SCK1  = PIN_SPI1 _SCK;

// SD Card CS/SS pin
static const uint8_t SS_2 = (46u);
static const uint8_t CS_SD = (46u);

Is the schematic outdated?
If thi is not a pin configuration error, do you have any other suggestions?

2

The schematic is correct, however, the numbers listed next to the MCU pins are the physical pin numbers. (See the datasheet pp.33-35: http://ww1.microchip.com/downloads/en/DeviceDoc/40001882A.pdf)

These numbers are not related to how they are referenced with the Ardunio system.

For example:

  • D11 (referenced as 11) is PA16 which is physical pin 35.
  • MISO (referenced as MISO or 42) is PA22 which is physical pin 43.
3

@GabrielNotman, sorry for the late reply on this but since the schematic is correct, do you see any other point where this might fail? I have indeed used multiple SD cards with no luck. What could I be missing; :slight_smile: