SDSPIUSCIB_HWAttrs Struct Reference

SDSPIUSCIB Hardware attributes. More...

#include <SDSPIUSCIB.h>

Data Fields
uint32_t	baseAddr
uint8_t	clockSource
uint8_t	portSCK
uint32_t	pinSCK
uint8_t	portMISO
uint32_t	pinMISO
uint8_t	portMOSI
uint32_t	pinMOSI
uint8_t	portCS
uint32_t	pinCS

Detailed Description

SDSPIUSCIB Hardware attributes.

The SDSPIUSCIB configuration structure describes to the SDSPIUSCIB driver implementation hardware specifies on which SPI peripheral, GPIO Pins and Ports are to be used.

The SDSPIUSCIB 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:

• inc/hw_memmap.h
• usci_b_spi.h

An example configuration structure could look as the following:

const SDSPIUSCIB_HWAttrs sdspiUSCIBHWAttrs = {
    {
         .baseAddr = USCI_B0_BASE, // SPI Peripheral's base address
         .clockSource = USCI_B_SPI_CLOCKSOURCE_SMCLK, // Clock source

         .portSCK = GPIO_PORT_P3,  // SPI SCK PORT
         .pinSCK = GPIO_PIN2,      // SPI SCK PIN

         .portMISO = GPIO_PORT_P3, // SPI MISO PORT
         .pinMISO = GPIO_PIN1,     // SPI MIS0 PIN

         .portMOSI = GPIO_PORT_P3, // SPI MOSI PORT
         .pinMOSI = GPIO_PIN0,     // SPI MOSI PIN

         .portCS = GPIO_PORT_P2,   // GPIO Chip select port
         .pinCS = GPIO_PIN7,       // GPIO Chip select pin
     },
};

Field Documentation

uint32_t SDSPIUSCIB_HWAttrs::baseAddr

SPI Peripheral's base address

uint8_t SDSPIUSCIB_HWAttrs::clockSource

SPIUSCI Clock source

uint8_t SDSPIUSCIB_HWAttrs::portSCK

SPI port uses for the SCK, MISO, and MOSI pins

uint32_t SDSPIUSCIB_HWAttrs::pinSCK

SPI SCK pin

uint8_t SDSPIUSCIB_HWAttrs::portMISO

SPI port uses for the SCK, MISO, and MOSI pins

uint32_t SDSPIUSCIB_HWAttrs::pinMISO

SPI MISO pin

uint8_t SDSPIUSCIB_HWAttrs::portMOSI

SPI port uses for the SCK, MISO, and MOSI pins

uint32_t SDSPIUSCIB_HWAttrs::pinMOSI

SPI MOSI pin

uint8_t SDSPIUSCIB_HWAttrs::portCS

GPIO Port used for the chip select

uint32_t SDSPIUSCIB_HWAttrs::pinCS

GPIO Pin used for the chip select

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

• SDSPIUSCIB.h