neorv32_sdi.h File Reference

Serial data interface controller (SPPI) HW driver header file. More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	neorv32_sdi_t

Functions
Prototypes
int	neorv32_sdi_available (void)
void	neorv32_sdi_setup (uint32_t irq_mask)
void	neorv32_sdi_disable (void)
void	neorv32_sdi_enable (void)
int	neorv32_sdi_get_fifo_depth (void)
int	neorv32_sdi_put (uint8_t data)
int	neorv32_sdi_get (uint8_t *data)
int	neorv32_sdi_check_cs (void)

IO Device: Serial Data Interface (SDI)
#define	NEORV32_SDI   ((neorv32_sdi_t*) (NEORV32_SDI_BASE))
enum	NEORV32_SDI_CTRL_enum {   SDI_CTRL_EN = 0 , SDI_CTRL_FIFO_LSB = 4 , SDI_CTRL_FIFO_MSB = 7 , SDI_CTRL_IRQ_RX_AVAIL = 15 ,   SDI_CTRL_IRQ_RX_HALF = 16 , SDI_CTRL_IRQ_RX_FULL = 17 , SDI_CTRL_IRQ_TX_EMPTY = 18 , SDI_CTRL_IRQ_TX_NHALF = 19 ,   SDI_CTRL_RX_AVAIL = 23 , SDI_CTRL_RX_HALF = 24 , SDI_CTRL_RX_FULL = 25 , SDI_CTRL_TX_EMPTY = 26 ,   SDI_CTRL_TX_NHALF = 27 , SDI_CTRL_TX_FULL = 28 , SDI_CTRL_CS_ACTIVE = 31 }

Detailed Description

Serial data interface controller (SPPI) HW driver header file.

Note

These functions should only be used if the SDI unit was synthesized (IO_SDI_EN = true).

See also

https://stnolting.github.io/neorv32/sw/files.html

Macro Definition Documentation

NEORV32_SDI

#define NEORV32_SDI   ((neorv32_sdi_t*) (NEORV32_SDI_BASE))

SDI module hardware access (neorv32_sdi_t)

Enumeration Type Documentation

NEORV32_SDI_CTRL_enum

enum NEORV32_SDI_CTRL_enum

SDI control register bits

Enumerator
SDI_CTRL_EN	SDI control register(0) (r/w): SID module enable
SDI_CTRL_FIFO_LSB	SDI control register(4) (r/-): log2 of SDI FIFO size, LSB
SDI_CTRL_FIFO_MSB	SDI control register(7) (r/-): log2 of SDI FIFO size, MSB
SDI_CTRL_IRQ_RX_AVAIL	SDI control register(15) (r/w): IRQ when RX FIFO not empty
SDI_CTRL_IRQ_RX_HALF	SDI control register(16) (r/w): IRQ when RX FIFO at least half full
SDI_CTRL_IRQ_RX_FULL	SDI control register(17) (r/w): IRQ when RX FIFO full
SDI_CTRL_IRQ_TX_EMPTY	SDI control register(18) (r/w): IRQ when TX FIFO empty
SDI_CTRL_IRQ_TX_NHALF	SDI control register(19) (r/w): IRQ when TX FIFO not at least half full
SDI_CTRL_RX_AVAIL	SDI control register(23) (r/-): RX FIFO not empty
SDI_CTRL_RX_HALF	SDI control register(24) (r/-): RX FIFO at least half full
SDI_CTRL_RX_FULL	SDI control register(25) (r/-): RX FIFO full
SDI_CTRL_TX_EMPTY	SDI control register(26) (r/-): TX FIFO empty
SDI_CTRL_TX_NHALF	SDI control register(27) (r/-): TX FIFO not at least half full
SDI_CTRL_TX_FULL	SDI control register(28) (r/-): TX FIFO full
SDI_CTRL_CS_ACTIVE	SDI control register(31) (r/-): Chip-select is active when set

Function Documentation

neorv32_sdi_available()

int neorv32_sdi_available

(

void

)

Check if SDI unit was synthesized.

Returns

0 if SDI was not synthesized, 1 if SPI is available.

neorv32_sdi_check_cs()

int neorv32_sdi_check_cs

(

void

)

Get status of chip-select line.

Returns

1 if chip-select line is enabled/active (driven low), 0 otherwise.

neorv32_sdi_disable()

void neorv32_sdi_disable

(

void

)

Disable SDI controller.

neorv32_sdi_enable()

void neorv32_sdi_enable

(

void

)

Enable SDI controller.

neorv32_sdi_get()

int neorv32_sdi_get

(

uint8_t *

data

)

Get data from SDI input FIFO.

Parameters

[in,out]

Pointer

fro data byte read from RX FIFO.

Returns

-1 if RX FIFO is empty, 0 if success.

neorv32_sdi_get_fifo_depth()

int neorv32_sdi_get_fifo_depth

(

void

)

Get SDI FIFO depth.

Returns

FIFO depth (number of entries), 1 if no FIFO implemented

neorv32_sdi_put()

int neorv32_sdi_put

(

uint8_t

data

)

Push data to SDI output FIFO.

Parameters

[in]

data

Byte to push into TX FIFO.

Returns

-1 if TX FIFO is full, 0 if success.

neorv32_sdi_setup()

void neorv32_sdi_setup

(

uint32_t

irq_mask

)

Reset, enable and configure SDI controller. The SDI control register bits are listed in NEORV32_SDI_CTRL_enum.

Parameters

[in]

irq_mask

Interrupt configuration mask (CTRL's irq_* bits).