buffered_uart_ultra.h File Reference

SAM D21 UART API Declaration Implementations.

Copyright (c) 2019 Microchip Technology Inc. and its subsidiaries.

#include "compiler.h"
#include "status_codes.h"

Macros
#define	HOST_SERCOM_MUX_SETTING   USART_RX_1_TX_0_XCK_1
#define	HOST_SERCOM_PINMUX_PAD0   PINMUX_PA22C_SERCOM3_PAD0
#define	HOST_SERCOM_PINMUX_PAD1   PINMUX_PA23C_SERCOM3_PAD1
#define	HOST_SERCOM_PINMUX_PAD2   PINMUX_UNUSED
#define	HOST_SERCOM_PINMUX_PAD3   SERCOM3_DMAC_ID_RX
#define	SERIAL_RX_BUF_SIZE_HOST   256
#define	USART_HOST   SERCOM3
	UART Interface. More...
#define	USART_HOST_BAUDRATE   115200
	Baudrate setting. More...
#define	USART_HOST_RX_ISR_ENABLE()

Functions
uint8_t	buffered_uart_getchar (void)
	This function performs a blocking character receive functionality. More...
int	buffered_uart_getchar_nowait (void)
	This function performs a non-blocking character receive functionality. More...
void	buffered_uart_init (uint32_t baudrate)
	Initializes the Buffered Serial IO Module. More...
int	buffered_uart_is_empty (void)
	check if the uart buffer is empty or not. More...
void	buffered_uart_putchar (uint8_t)
	This function prints the character to the host. More...
uint8_t	buffered_uart_rx (uint8_t *data, uint8_t max_length)
	Receives data from UART. More...
void	buffered_uart_term (void)
	Terminate the Buffered Serial IO Module. More...
uint8_t	buffered_uart_tx (uint8_t *data, uint32_t length)
	Transmits data via UART. More...
void	USART_HOST_ISR_VECT (void)

#define HOST_SERCOM_MUX_SETTING   USART_RX_1_TX_0_XCK_1

Referenced by buffered_uart_init().

#define HOST_SERCOM_PINMUX_PAD0   PINMUX_PA22C_SERCOM3_PAD0

Referenced by buffered_uart_init().

#define HOST_SERCOM_PINMUX_PAD1   PINMUX_PA23C_SERCOM3_PAD1

Referenced by buffered_uart_init().

#define HOST_SERCOM_PINMUX_PAD2   PINMUX_UNUSED

Referenced by buffered_uart_init().

#define HOST_SERCOM_PINMUX_PAD3   SERCOM3_DMAC_ID_RX

Referenced by buffered_uart_init().

#define SERIAL_RX_BUF_SIZE_HOST   256

Referenced by buffered_uart_getchar_nowait(), buffered_uart_rx(), and USART_HOST_ISR_VECT().

#define USART_HOST   SERCOM3

UART Interface.

Referenced by buffered_uart_init(), buffered_uart_putchar(), and USART_HOST_ISR_VECT().

#define USART_HOST_BAUDRATE   115200

Baudrate setting.

#define USART_HOST_RX_ISR_ENABLE

(

)

Value:

do {                           \
	_sercom_set_handler(3, USART_HOST_ISR_VECT);\
	USART_HOST->USART.INTENSET.reg  = SERCOM_USART_INTENSET_RXC;\
    NVIC_EnableIRQ(SERCOM3_IRQn);\
} while (0)

Referenced by buffered_uart_init().

uint8_t buffered_uart_getchar

(

void

)

This function performs a blocking character receive functionality.

Returns

returns the data which is received

References buffered_uart_getchar_nowait().

int buffered_uart_getchar_nowait

(

void

)

This function performs a non-blocking character receive functionality.

Returns

'-1' if no data is received or returns the data if a character is received

References cpu_irq_disable, cpu_irq_enable, serial_rx_buf, serial_rx_buf_head, SERIAL_RX_BUF_SIZE_HOST, and serial_rx_buf_tail.

Referenced by buffered_uart_getchar().

void buffered_uart_init

(

uint32_t

baudrate

)

Initializes the Buffered Serial IO Module.

Returns

STATUS_OK for successful initialization and FAILURE in case the IO is not initialized

References usart_config::baudrate, HOST_SERCOM_MUX_SETTING, HOST_SERCOM_PINMUX_PAD0, HOST_SERCOM_PINMUX_PAD1, HOST_SERCOM_PINMUX_PAD2, HOST_SERCOM_PINMUX_PAD3, host_uart_module, usart_config::mux_setting, usart_config::pinmux_pad0, usart_config::pinmux_pad1, usart_config::pinmux_pad2, usart_config::pinmux_pad3, serial_rx_buf_head, serial_rx_buf_tail, usart_enable(), usart_get_config_defaults(), USART_HOST, and USART_HOST_RX_ISR_ENABLE.

Referenced by main(), and serial_bridge_process_reconfigure().

int buffered_uart_is_empty

(

void

)

check if the uart buffer is empty or not.

Returns

non zero if empy. not initialized

void buffered_uart_putchar

(

uint8_t

)

This function prints the character to the host.

Returns

void

References USART_HOST.

Referenced by buffered_uart_tx(), serial_bridge_process_frame(), serial_bridge_process_read_block(), serial_bridge_process_read_reg_with_ret(), serial_bridge_process_reconfigure(), serial_bridge_process_sync_cmd(), serial_bridge_process_write_block(), and serial_bridge_process_write_reg().

uint8_t buffered_uart_rx	(	uint8_t *	data,
		uint8_t	max_length
	)

Receives data from UART.

Parameters

data	pointer to the buffer where the received data is to be stored
max_length	maximum length of data to be received

Returns

actual number of bytes received

References cpu_irq_disable, cpu_irq_enable, serial_rx_buf, serial_rx_buf_head, SERIAL_RX_BUF_SIZE_HOST, and serial_rx_buf_tail.

Referenced by enter_wifi_firmware_download(), and serial_bridge_frame_receive().

void buffered_uart_term

(

void

)

Terminate the Buffered Serial IO Module.

Returns

STATUS_OK for successful initialization and FAILURE in case the IO is not initialized

References host_uart_module, and usart_disable().

Referenced by serial_bridge_process_reconfigure().

uint8_t buffered_uart_tx	(	uint8_t *	data,
		uint32_t	length
	)

Transmits data via UART.

Parameters

data	Pointer to the buffer where the data to be transmitted is present
length	Number of bytes to be transmitted

Returns

Number of bytes actually transmitted

References buffered_uart_putchar(), and STATUS_OK.

Referenced by serial_bridge_process_read_block().

void USART_HOST_ISR_VECT

(

void

)

References serial_rx_buf, SERIAL_RX_BUF_SIZE_HOST, serial_rx_buf_tail, and USART_HOST.