neorv32_uart.h File Reference

Universal asynchronous receiver/transmitter (UART0/UART1) HW driver header file. More...

#include <stdarg.h>

Go to the source code of this file.

Data Structures
struct	neorv32_uart_t

Functions
Prototypes
int	neorv32_uart_available (neorv32_uart_t *UARTx)
int	neorv32_uart_get_rx_fifo_depth (neorv32_uart_t *UARTx)
int	neorv32_uart_get_tx_fifo_depth (neorv32_uart_t *UARTx)
void	neorv32_uart_setup (neorv32_uart_t *UARTx, uint32_t baudrate, uint32_t irq_mask)
void	neorv32_uart_enable (neorv32_uart_t *UARTx)
void	neorv32_uart_disable (neorv32_uart_t *UARTx)
void	neorv32_uart_rtscts_enable (neorv32_uart_t *UARTx)
void	neorv32_uart_rtscts_disable (neorv32_uart_t *UARTx)
void	neorv32_uart_putc (neorv32_uart_t *UARTx, char c)
int	neorv32_uart_tx_busy (neorv32_uart_t *UARTx)
char	neorv32_uart_getc (neorv32_uart_t *UARTx)
int	neorv32_uart_char_received (neorv32_uart_t *UARTx)
char	neorv32_uart_char_received_get (neorv32_uart_t *UARTx)
void	neorv32_uart_puts (neorv32_uart_t *UARTx, const char *s)
void	neorv32_uart_vprintf (neorv32_uart_t *UARTx, const char *format, va_list args)
void	neorv32_uart_printf (neorv32_uart_t *UARTx, const char *format,...)
int	neorv32_uart_scan (neorv32_uart_t *UARTx, char *buffer, int max_size, int echo)

IO Device: Primary/Secondary Universal Asynchronous Receiver and Transmitter (UART0 / UART1)
#define	NEORV32_UART0   ((neorv32_uart_t*) (NEORV32_UART0_BASE))
#define	NEORV32_UART1   ((neorv32_uart_t*) (NEORV32_UART1_BASE))
enum	NEORV32_UART_CTRL_enum {   UART_CTRL_EN = 0 , UART_CTRL_SIM_MODE = 1 , UART_CTRL_HWFC_EN = 2 , UART_CTRL_PRSC0 = 3 ,   UART_CTRL_PRSC1 = 4 , UART_CTRL_PRSC2 = 5 , UART_CTRL_BAUD0 = 6 , UART_CTRL_BAUD1 = 7 ,   UART_CTRL_BAUD2 = 8 , UART_CTRL_BAUD3 = 9 , UART_CTRL_BAUD4 = 10 , UART_CTRL_BAUD5 = 11 ,   UART_CTRL_BAUD6 = 12 , UART_CTRL_BAUD7 = 13 , UART_CTRL_BAUD8 = 14 , UART_CTRL_BAUD9 = 15 ,   UART_CTRL_RX_NEMPTY = 16 , UART_CTRL_RX_HALF = 17 , UART_CTRL_RX_FULL = 18 , UART_CTRL_TX_EMPTY = 19 ,   UART_CTRL_TX_NHALF = 20 , UART_CTRL_TX_FULL = 21 , UART_CTRL_IRQ_RX_NEMPTY = 22 , UART_CTRL_IRQ_RX_HALF = 23 ,   UART_CTRL_IRQ_RX_FULL = 24 , UART_CTRL_IRQ_TX_EMPTY = 25 , UART_CTRL_IRQ_TX_NHALF = 26 , UART_CTRL_RX_OVER = 30 ,   UART_CTRL_TX_BUSY = 31 }
enum	NEORV32_UART_DATA_enum {   UART_DATA_RTX_LSB = 0 , UART_DATA_RTX_MSB = 7 , UART_DATA_RX_FIFO_SIZE_LSB = 8 , UART_DATA_RX_FIFO_SIZE_MSB = 11 ,   UART_DATA_TX_FIFO_SIZE_LSB = 12 , UART_DATA_TX_FIFO_SIZE_MSB = 15 }

Detailed Description

Universal asynchronous receiver/transmitter (UART0/UART1) HW driver header file.

Macro Definition Documentation

NEORV32_UART0

#define NEORV32_UART0   ((neorv32_uart_t*) (NEORV32_UART0_BASE))

UART0 module hardware access (neorv32_uart_t)

NEORV32_UART1

#define NEORV32_UART1   ((neorv32_uart_t*) (NEORV32_UART1_BASE))

UART1 module hardware access (neorv32_uart_t)

Enumeration Type Documentation

NEORV32_UART_CTRL_enum

enum NEORV32_UART_CTRL_enum

UART control register bits

Enumerator
UART_CTRL_EN	UART control register(0) (r/w): UART global enable
UART_CTRL_SIM_MODE	UART control register(1) (r/w): Simulation output override enable
UART_CTRL_HWFC_EN	UART control register(2) (r/w): Enable RTS/CTS hardware flow-control
UART_CTRL_PRSC0	UART control register(3) (r/w): clock prescaler select bit 0
UART_CTRL_PRSC1	UART control register(4) (r/w): clock prescaler select bit 1
UART_CTRL_PRSC2	UART control register(5) (r/w): clock prescaler select bit 2
UART_CTRL_BAUD0	UART control register(6) (r/w): BAUD rate divisor, bit 0
UART_CTRL_BAUD1	UART control register(7) (r/w): BAUD rate divisor, bit 1
UART_CTRL_BAUD2	UART control register(8) (r/w): BAUD rate divisor, bit 2
UART_CTRL_BAUD3	UART control register(9) (r/w): BAUD rate divisor, bit 3
UART_CTRL_BAUD4	UART control register(10) (r/w): BAUD rate divisor, bit 4
UART_CTRL_BAUD5	UART control register(11) (r/w): BAUD rate divisor, bit 5
UART_CTRL_BAUD6	UART control register(12) (r/w): BAUD rate divisor, bit 6
UART_CTRL_BAUD7	UART control register(13) (r/w): BAUD rate divisor, bit 7
UART_CTRL_BAUD8	UART control register(14) (r/w): BAUD rate divisor, bit 8
UART_CTRL_BAUD9	UART control register(15) (r/w): BAUD rate divisor, bit 9
UART_CTRL_RX_NEMPTY	UART control register(16) (r/-): RX FIFO not empty
UART_CTRL_RX_HALF	UART control register(17) (r/-): RX FIFO at least half-full
UART_CTRL_RX_FULL	UART control register(18) (r/-): RX FIFO full
UART_CTRL_TX_EMPTY	UART control register(19) (r/-): TX FIFO empty
UART_CTRL_TX_NHALF	UART control register(20) (r/-): TX FIFO not at least half-full
UART_CTRL_TX_FULL	UART control register(21) (r/-): TX FIFO full
UART_CTRL_IRQ_RX_NEMPTY	UART control register(22) (r/w): Fire IRQ if RX FIFO not empty
UART_CTRL_IRQ_RX_HALF	UART control register(23) (r/w): Fire IRQ if RX FIFO at least half-full
UART_CTRL_IRQ_RX_FULL	UART control register(24) (r/w): Fire IRQ if RX FIFO full
UART_CTRL_IRQ_TX_EMPTY	UART control register(25) (r/w): Fire IRQ if TX FIFO empty
UART_CTRL_IRQ_TX_NHALF	UART control register(26) (r/w): Fire IRQ if TX FIFO not at least half-full
UART_CTRL_RX_OVER	UART control register(30) (r/-): RX FIFO overflow
UART_CTRL_TX_BUSY	UART control register(31) (r/-): Transmitter busy or TX FIFO not empty

NEORV32_UART_DATA_enum

enum NEORV32_UART_DATA_enum

UART data register bits

Enumerator
UART_DATA_RTX_LSB	UART data register(0) (r/w): UART receive/transmit data, LSB
UART_DATA_RTX_MSB	UART data register(7) (r/w): UART receive/transmit data, MSB
UART_DATA_RX_FIFO_SIZE_LSB	UART data register(8) (r/-): log2(RX FIFO size), LSB
UART_DATA_RX_FIFO_SIZE_MSB	UART data register(11) (r/-): log2(RX FIFO size), MSB
UART_DATA_TX_FIFO_SIZE_LSB	UART data register(12) (r/-): log2(RX FIFO size), LSB
UART_DATA_TX_FIFO_SIZE_MSB	UART data register(15) (r/-): log2(RX FIFO size), MSB

Function Documentation

neorv32_uart_available()

int neorv32_uart_available

(

neorv32_uart_t *

UARTx

)

Check if UART unit was synthesized.

Parameters

[in,out]

Hardware

handle to UART register struct, neorv32_uart_t.

Returns

0 if UART0/1 was not synthesized, 1 if UART0/1 is available.

neorv32_uart_char_received()

int neorv32_uart_char_received

(

neorv32_uart_t *

UARTx

)

Check if UART has received a char.

Note

This function is non-blocking.

Use neorv32_uart_char_received_get(void) to get the char.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

1 when a char has been received, 0 otherwise.

neorv32_uart_char_received_get()

char neorv32_uart_char_received_get

(

neorv32_uart_t *

UARTx

)

Get a received char from UART.

Note

This function is non-blocking.

Should only be used in combination with neorv32_uart_char_received(void).

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

Received char.

neorv32_uart_disable()

void neorv32_uart_disable

(

neorv32_uart_t *

UARTx

)

Disable UART.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

neorv32_uart_enable()

void neorv32_uart_enable

(

neorv32_uart_t *

UARTx

)

Enable UART.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

neorv32_uart_get_rx_fifo_depth()

int neorv32_uart_get_rx_fifo_depth

(

neorv32_uart_t *

UARTx

)

Get UART RX FIFO depth.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

FIFO depth (number of entries)

neorv32_uart_get_tx_fifo_depth()

int neorv32_uart_get_tx_fifo_depth

(

neorv32_uart_t *

UARTx

)

Get UART TX FIFO depth.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

FIFO depth (number of entries)

neorv32_uart_getc()

char neorv32_uart_getc

(

neorv32_uart_t *

UARTx

)

Get char from UART.

Note

This function is blocking.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

Received char.

neorv32_uart_printf()

void neorv32_uart_printf	(	neorv32_uart_t *	UARTx,
		const char *	format,
			... )

Custom version of 'printf' printing to UART.

Note

This function is blocking.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in]	format	Pointer to format string. See neorv32_uart_vprintf.

neorv32_uart_putc()

void neorv32_uart_putc	(	neorv32_uart_t *	UARTx,
		char	c )

Send single char via UART.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in]	c	Char to be send.

neorv32_uart_puts()

void neorv32_uart_puts	(	neorv32_uart_t *	UARTx,
		const char *	s )

Print string (zero-terminated) via UART. Print full line break "\r\n" for every '
'.

Note

This function is blocking.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in]	s	Pointer to string.

neorv32_uart_rtscts_disable()

void neorv32_uart_rtscts_disable

(

neorv32_uart_t *

UARTx

)

Disable RTS/CTS hardware flow-control.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

neorv32_uart_rtscts_enable()

void neorv32_uart_rtscts_enable

(

neorv32_uart_t *

UARTx

)

Enable RTS/CTS hardware flow-control.

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

neorv32_uart_scan()

int neorv32_uart_scan	(	neorv32_uart_t *	UARTx,
		char *	buffer,
		int	max_size,
		int	echo )

Simplified custom version of 'scanf' reading from UART.

Note

This function is blocking.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in,out]	buffer	Pointer to array of chars to store string.
[in]	max_size	Maximum number of chars to sample.
[in]	echo	Echo UART input when 1.

Returns

Number of chars read.

neorv32_uart_setup()

void neorv32_uart_setup	(	neorv32_uart_t *	UARTx,
		uint32_t	baudrate,
		uint32_t	irq_mask )

Reset, configure and enable UART.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in]	baudrate	Targeted BAUD rate (e.g. 19200).
[in]	irq_mask	Interrupt configuration mask (CTRL's irq_* bits).

neorv32_uart_tx_busy()

int neorv32_uart_tx_busy

(

neorv32_uart_t *

UARTx

)

Check if UART TX is busy (transmitter busy or data left in TX buffer).

Parameters

[in,out]

UARTx

Hardware handle to UART register struct, neorv32_uart_t.

Returns

0 if idle, 1 if busy

neorv32_uart_vprintf()

void neorv32_uart_vprintf	(	neorv32_uart_t *	UARTx,
		const char *	format,
		va_list	args )

Custom version of 'vprintf' printing to UART.

Note

This function is blocking.

Parameters

[in,out]	UARTx	Hardware handle to UART register struct, neorv32_uart_t.
[in]	format	Pointer to format string.
[in]	args	A value identifying a variable arguments list.

s	String (array of chars, zero-terminated)
c	Single char
d/i	32-bit signed number, printed as decimal
u	32-bit unsigned number, printed as decimal
x	32-bit number, printed as 8-char hexadecimal - lower-case
X	32-bit number, printed as 8-char hexadecimal - upper-case
p	32-bit pointer, printed as 8-char hexadecimal - lower-case