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Description
Hello,
Here the list of default pins for SPI for Arduino Zero seems to be misaligned with its default variant.h, variant.cpp and SPI.cpp.
The default SPI is:
SPIClassSAMD SPI (&PERIPH_SPI, PIN_SPI_MISO, PIN_SPI_SCK, PIN_SPI_MOSI, PAD_SPI_TX, PAD_SPI_RX);with
#define PIN_SPI_MISO (22u)
#define PIN_SPI_MOSI (23u)
#define PIN_SPI_SCK (24u)
#define PERIPH_SPI sercom4
#define PAD_SPI_TX SPI_PAD_2_SCK_3
#define PAD_SPI_RX SERCOM_RX_PAD_0which are, by default:
const PinDescription g_APinDescription[]=
{
/**...**/
// 22..24 - SPI pins (ICSP:MISO,SCK,MOSI)
// ----------------------
{ PORTA, 12, PIO_SERCOM_ALT, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_12 }, // MISO: SERCOM4/PAD[0]
{ PORTB, 10, PIO_SERCOM_ALT, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_10 }, // MOSI: SERCOM4/PAD[2]
{ PORTB, 11, PIO_SERCOM_ALT, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER, EXTERNAL_INT_11 }, // SCK: SERCOM4/PAD[3]
/**...**/
}As a result, the default pins should be the ones on the ICSP header:
22 (MISO)
23 (MOSI)
24 (SCK)
and no default Chip Select (CS) pin.
Please correct me if I'm wrong. Maybe other boards are also misaligned, could be something to check.