SDSPIMSP432_HWAttrs Struct Reference

SDSPIMSP432 Hardware attributes. More...

#include <SDSPIMSP432.h>

Data Fields
uint32_t	baseAddr
uint8_t	clockSource
uint8_t	portSCK
uint16_t	pinSCK
uint8_t	sckMode
uint8_t	portMISO
uint16_t	pinMISO
uint8_t	misoMode
uint8_t	portMOSI
uint16_t	pinMOSI
uint8_t	mosiMode
uint8_t	portCS
uint16_t	pinCS

Detailed Description

SDSPIMSP432 Hardware attributes.

The SDSPIMSP432 HWAttrs configuration structure contains SPI peripheral and GPIO Pin details required by the SDSPIMSP432 driver implementation.

The SDSPIMSP432 driver uses this information to:

• configure and reconfigure specific ports/pins to initialize the SD Card for SPI mode
• identify which SPI peripheral is used for data communications
• identify which GPIO port and pin is used for the SPI chip select mechanism
• identify which GPIO port and pin is concurrently located on the SPI's MOSI (TX) pin.

Remarks

To initialize the SD Card into SPI mode, the SDSPI driver changes the SPI's MOSI pin into a GPIO pin so it can kept driven HIGH while the SPI SCK pin can toggle. After the initialization, the TX pin is reverted back to the SPI MOSI mode.

These fields are used by driverlib APIs and therefore must be populated by driverlib macro definitions. For TivaWare these definitions are found in:

• spi.h

An example configuration structure could look as the following:

const SDSPIMSP432_HWAttrs sdspiMSP432HWAttrs[MSP_EXP432P401R_SDSPICOUNT] = {
    {
        .baseAddr = EUSCI_B0_BASE,
        .clockSource = EUSCI_B_SPI_CLOCKSOURCE_SMCLK,

        // CLK, MOSI & MISO ports & pins
        .portSCK = GPIO_PORT_P1,
        .pinSCK = GPIO_PIN5,
        .portMISO = GPIO_PORT_P1,
        .pinMISO = GPIO_PIN7,
        .portMOSI = GPIO_PORT_P1,
        .pinMOSI = GPIO_PIN6,

        // Chip select port & pin
        .portCS = GPIO_PORT_P4,
        .pinCS = GPIO_PIN6
    }
};

Field Documentation

uint32_t SDSPIMSP432_HWAttrs::baseAddr

SPI Peripheral's base address

uint8_t SDSPIMSP432_HWAttrs::clockSource

SPIUSCI Clock source

uint8_t SDSPIMSP432_HWAttrs::portSCK

SPI port for the SCK pin

uint16_t SDSPIMSP432_HWAttrs::pinSCK

SPI SCK pin

uint8_t SDSPIMSP432_HWAttrs::sckMode

GPIO mode to enable SCK pin

uint8_t SDSPIMSP432_HWAttrs::portMISO

SPI port for the MISO pin

uint16_t SDSPIMSP432_HWAttrs::pinMISO

SPI MISO pin

uint8_t SDSPIMSP432_HWAttrs::misoMode

GPIO mode to enable MISO pin

uint8_t SDSPIMSP432_HWAttrs::portMOSI

SPI port for the MOSI pin

uint16_t SDSPIMSP432_HWAttrs::pinMOSI

SPI MOSI pin

uint8_t SDSPIMSP432_HWAttrs::mosiMode

GPIO mode to enable MOSI pin

uint8_t SDSPIMSP432_HWAttrs::portCS

GPIO Port used for the chip select

uint16_t SDSPIMSP432_HWAttrs::pinCS

GPIO Pin used for the chip select

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The documentation for this struct was generated from the following file:

• SDSPIMSP432.h