neorv32_slink.h File Reference

Stream Link Interface HW driver header file. More...

#include <stdint.h>

Go to the source code of this file.

Data Structures
struct	neorv32_slink_t

Functions
Prototypes
int	neorv32_slink_available (void)
void	neorv32_slink_setup (uint32_t irq)
void	neorv32_slink_rx_clear (void)
void	neorv32_slink_tx_clear (void)
int	neorv32_slink_get_rx_fifo_depth (void)
int	neorv32_slink_get_tx_fifo_depth (void)
uint32_t	neorv32_slink_get (void)
uint32_t	neorv32_slink_check_last (void)
void	neorv32_slink_set_dst (uint32_t dst)
uint32_t	neorv32_slink_get_src (void)
void	neorv32_slink_put (uint32_t tx_data)
void	neorv32_slink_put_last (uint32_t tx_data)
int	neorv32_slink_rx_status (void)
int	neorv32_slink_tx_status (void)

IO Device: Stream Link Interface (SLINK)
#define	NEORV32_SLINK   ((neorv32_slink_t*) (NEORV32_SLINK_BASE))
enum	NEORV32_SLINK_CTRL_enum {   SLINK_CTRL_EN = 0 , SLINK_CTRL_RX_CLR = 1 , SLINK_CTRL_TX_CLR = 2 , SLINK_CTRL_RX_LAST = 4 ,   SLINK_CTRL_RX_EMPTY = 8 , SLINK_CTRL_RX_HALF = 9 , SLINK_CTRL_RX_FULL = 10 , SLINK_CTRL_TX_EMPTY = 11 ,   SLINK_CTRL_TX_HALF = 12 , SLINK_CTRL_TX_FULL = 13 , SLINK_CTRL_IRQ_RX_NEMPTY = 16 , SLINK_CTRL_IRQ_RX_HALF = 17 ,   SLINK_CTRL_IRQ_RX_FULL = 18 , SLINK_CTRL_IRQ_TX_EMPTY = 19 , SLINK_CTRL_IRQ_TX_NHALF = 20 , SLINK_CTRL_IRQ_TX_NFULL = 21 ,   SLINK_CTRL_RX_FIFO_LSB = 24 , SLINK_CTRL_RX_FIFO_MSB = 27 , SLINK_CTRL_TX_FIFO_LSB = 28 , SLINK_CTRL_TX_FIFO_MSB = 31 }
enum	NEORV32_SLINK_ROUTE_enum { SLINK_ROUTE_DST_LSB = 0 , SLINK_ROUTE_DST_MSB = 3 , SLINK_ROUTE_SRC_LSB = 4 , SLINK_ROUTE_SRC_MSB = 7 }
enum	NEORV32_SLINK_STATUS_enum { SLINK_FIFO_EMPTY = 0 , SLINK_FIFO_HALF = 1 , SLINK_FIFO_FULL = 2 }

Detailed Description

Stream Link Interface HW driver header file.

Macro Definition Documentation

NEORV32_SLINK

#define NEORV32_SLINK   ((neorv32_slink_t*) (NEORV32_SLINK_BASE))

SLINK module hardware handle (neorv32_slink_t)

Enumeration Type Documentation

NEORV32_SLINK_CTRL_enum

enum NEORV32_SLINK_CTRL_enum

SLINK control register bits

Enumerator
SLINK_CTRL_EN	SLINK control register(0) (r/w): SLINK unit enable
SLINK_CTRL_RX_CLR	SLINK control register(1) (-/w): Clear RX FIFO, auto-clears
SLINK_CTRL_TX_CLR	SLINK control register(2) (-/w): Clear TX FIFO, auto-clears
SLINK_CTRL_RX_LAST	SLINK control register(4) (r/-): RX end-of-stream delimiter
SLINK_CTRL_RX_EMPTY	SLINK control register(8) (r/-): RX FIFO empty
SLINK_CTRL_RX_HALF	SLINK control register(9) (r/-): RX FIFO at least half full
SLINK_CTRL_RX_FULL	SLINK control register(10) (r/-): RX FIFO full
SLINK_CTRL_TX_EMPTY	SLINK control register(11) (r/-): TX FIFO empty
SLINK_CTRL_TX_HALF	SLINK control register(12) (r/-): TX FIFO at least half full
SLINK_CTRL_TX_FULL	SLINK control register(13) (r/-): TX FIFO full
SLINK_CTRL_IRQ_RX_NEMPTY	SLINK control register(16) (r/w): interrupt if RX FIFO not empty
SLINK_CTRL_IRQ_RX_HALF	SLINK control register(17) (r/w): interrupt if RX FIFO at least half full
SLINK_CTRL_IRQ_RX_FULL	SLINK control register(18) (r/w): interrupt if RX FIFO full
SLINK_CTRL_IRQ_TX_EMPTY	SLINK control register(19) (r/w): interrupt if TX FIFO empty
SLINK_CTRL_IRQ_TX_NHALF	SLINK control register(20) (r/w): interrupt if TX FIFO not at least half full
SLINK_CTRL_IRQ_TX_NFULL	SLINK control register(21) (r/w): interrupt if TX FIFO not full
SLINK_CTRL_RX_FIFO_LSB	SLINK control register(24) (r/-): log2(RX FIFO size) LSB
SLINK_CTRL_RX_FIFO_MSB	SLINK control register(27) (r/-): log2(RX FIFO size) MSB
SLINK_CTRL_TX_FIFO_LSB	SLINK control register(28) (r/-): log2(TX FIFO size) LSB
SLINK_CTRL_TX_FIFO_MSB	SLINK control register(31) (r/-): log2(TX FIFO size) MSB

NEORV32_SLINK_ROUTE_enum

enum NEORV32_SLINK_ROUTE_enum

ROUTE register bits

Enumerator
SLINK_ROUTE_DST_LSB	SLINK routing register(0) (r/w): Destination routing information LSB
SLINK_ROUTE_DST_MSB	SLINK routing register(3) (r/w): Destination routing information MSB
SLINK_ROUTE_SRC_LSB	SLINK routing register(4) (r/-): Source routing information LSB
SLINK_ROUTE_SRC_MSB	SLINK routing register(7) (r/-): Source routing information MSB

NEORV32_SLINK_STATUS_enum

enum NEORV32_SLINK_STATUS_enum

SLINK module hardware handle (neorv32_slink_t)

Enumerator
SLINK_FIFO_EMPTY	FIFO is empty
SLINK_FIFO_HALF	FIFO is at least half full
SLINK_FIFO_FULL	FIFO is full

Function Documentation

neorv32_slink_available()

int neorv32_slink_available

(

void

)

Check if stream link interface was synthesized.

Returns

0 if SLINK was not synthesized, non-zero if SLINK is available.

neorv32_slink_check_last()

uint32_t neorv32_slink_check_last ( void )

inline

Check if last RX word has "end-of-stream" delimiter.

Note

This needs has to be called AFTER reading the actual data word using neorv32_slink_get(void).

Returns

0 if not end of stream, !=0 if end of stream.

neorv32_slink_get()

uint32_t neorv32_slink_get ( void )

inline

Read data from RX link (non-blocking)

Returns

Data received from link.

neorv32_slink_get_rx_fifo_depth()

int neorv32_slink_get_rx_fifo_depth

(

void

)

Get FIFO depth of RX link.

Returns

FIFO depth of RX link (1..32768).

neorv32_slink_get_src()

uint32_t neorv32_slink_get_src ( void )

inline

Get RX link routing source

Note

This needs has to be called AFTER reading the actual data word using neorv32_slink_get(void).

Returns

4-bit source routing ID.

neorv32_slink_get_tx_fifo_depth()

int neorv32_slink_get_tx_fifo_depth

(

void

)

Get FIFO depth of TX link.

Returns

FIFO depth of TX link (1..32768).

neorv32_slink_put()

void neorv32_slink_put ( uint32_t tx_data )

inline

Write data to TX link (non-blocking)

Parameters

[in]

tx_data

Data to send to link.

neorv32_slink_put_last()

void neorv32_slink_put_last ( uint32_t tx_data )

inline

Write data to TX link (non-blocking) and set "last" (end-of-stream) delimiter.

Parameters

[in]

tx_data

Data to send to link.

neorv32_slink_rx_clear()

void neorv32_slink_rx_clear

(

void

)

Clear RX FIFO.

neorv32_slink_rx_status()

int neorv32_slink_rx_status

(

void

)

Get RX link FIFO status.

Returns

FIFO status NEORV32_SLINK_STATUS_enum.

neorv32_slink_set_dst()

void neorv32_slink_set_dst ( uint32_t dst )

inline

Set TX link routing destination

Parameters

[in]

dst

Routing destination ID (4-bit, LSB-aligned).

neorv32_slink_setup()

void neorv32_slink_setup

(

uint32_t

irq

)

Reset, enable and configure SLINK.

Parameters

[in]

irq

Interrupt conditions (NEORV32_SLINK_CTRL_enum).

neorv32_slink_tx_clear()

void neorv32_slink_tx_clear

(

void

)

Clear TX FIFO.

neorv32_slink_tx_status()

int neorv32_slink_tx_status

(

void

)

Get TX link FIFO status.

Returns

FIFO status NEORV32_SLINK_STATUS_enum.