Hi,
I's setting up my 1st SPI on an Arduino M0. I wish to use SERCOM1 (not alt). I've read table 7.1 from the Atmel datasheet and believe I understand it.
I think I understand all the SPI initialization/creation parameters except for "PAD_SPI_TX" and "PAD_SPI_RX"
I've read the SERCOM.h for this board and see the enums (shown below) but for the life of me I cannot extract the meaning of these parameters ( PAD_SPI_TX, PAD_SPI_RX) which makes it hard to select a value to initialize the SPI.
Any help would be appreciated.
Thanks
John
Example I found:
SPIClass::SPIClass(
SERCOM *p_sercom,
uint8_t uc_pinMISO, (these appear to be the IC pin not the board pin)
uint8_t uc_pinSCK,
uint8_t uc_pinMOSI,
SercomSpiTXPad PadTx,
SercomRXPad PadRx)
: settings(SPISettings(0, MSBFIRST, SPI_MODE0))
SPIClass SPI (&PERIPH_SPI, PIN_SPI_MISO, PIN_SPI_SCK, PIN_SPI_MOSI, PAD_SPI_TX, PAD_SPI_RX);
#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_0
SPIClass SPI (&sercom4, 22, 24, 23, SPI_PAD_2_SCK_3, SERCOM_RX_PAD_0);
from SERCOM.h
typedef enum
{
SERCOM_RX_PAD_0 = 0,
SERCOM_RX_PAD_1,
SERCOM_RX_PAD_2,
SERCOM_RX_PAD_3
} SercomRXPad;
typedef enum
{
SPI_PAD_0_SCK_1 = 0,
SPI_PAD_2_SCK_3,
SPI_PAD_3_SCK_1,
SPI_PAD_0_SCK_3
} SercomSpiTXPad;
With the table you referenced I was able to understand the parameters. However I've not yet been able to get the SPI to work.