usart_sam_ba.c File Reference

USART functions for SAM-BA on SAM0.

Copyright (c) 2015-2018 Microchip Technology Inc. and its subsidiaries.

#include <asf.h>
#include "usart_sam_ba.h"
#include "conf_board.h"
#include "conf_clocks.h"
#include "conf_bootloader.h"

Functions
unsigned short	add_crc (char ptr, unsigned short crc)
	Compute the CRC. More...
static uint16_t	getbytes (uint8_t *ptr_data, uint16_t length)
uint8_t	getPacket (uint8_t *ptr_data, uint8_t sno)
	Used by Xdown to retrieve packets. More...
static int	putPacket (uint8_t *tmppkt, uint8_t sno)
	Used by Xup to send packets. More...
void	usart_close (void)
	Close the given USART. More...
int	usart_getc (void)
	Waits and gets a value on usart line. More...
uint32_t	usart_getdata (void *data, uint32_t length)
	Get data from com device. More...
uint32_t	usart_getdata_xmd (void *data, uint32_t length)
	Called when a transfer from host to target is being made (considered an download). More...
bool	usart_is_rx_ready (void)
	This function checks if a character has been received on the usart line. More...
void	usart_open ()
	Open the given USART. More...
int	usart_putc (int value)
	Puts a byte on usart line The type int is used to support printf redirection from compiler LIB. More...
uint32_t	usart_putdata (void const *data, uint32_t length)
	Send given data (polling) More...
uint32_t	usart_putdata_xmd (void const *data, uint32_t length)
	Called when a transfer from target to host is being made(considered an upload). More...
int	usart_readc (void)
	Gets a value on usart line. More...
int	usart_sharp_received (void)
	Returns true if the SAM-BA Uart received the sharp char. More...

Variables
volatile uint8_t	b_sharp_received
volatile uint8_t	buffer_rx_usart [USART_BUFFER_SIZE]
volatile uint8_t	buffer_tx_usart [USART_BUFFER_SIZE]
uint8_t	error_timeout
volatile uint8_t	idx_rx_read
volatile uint8_t	idx_rx_write
volatile uint8_t	idx_tx_read
volatile uint8_t	idx_tx_write
uint8_t	mode_of_transfer
uint16_t	size_of_data
struct usart_module	usart_sam_ba

unsigned short add_crc	(	char	ptr,
		unsigned short	crc
	)

Compute the CRC.

Gets data from usart line using Xmodem protocol.

References CRC16POLY.

Referenced by getbytes(), and putPacket().

static uint16_t getbytes ( uint8_t *  ptr_data, uint16_t  length  )

static

References add_crc(), error_timeout, length, mode_of_transfer, PKTLEN_128, size_of_data, and usart_getc().

Referenced by getPacket().

uint8_t getPacket	(	uint8_t *	ptr_data,
		uint8_t	sno
	)

Used by Xdown to retrieve packets.

References ACK, CAN, error_timeout, getbytes(), PKTLEN_128, usart_getc(), and usart_putc().

Referenced by usart_getdata_xmd().

static int putPacket ( uint8_t *  tmppkt, uint8_t  sno  )

static

Used by Xup to send packets.

References add_crc(), data, i, mode_of_transfer, PKTLEN_128, size_of_data, SOH, usart_getc(), and usart_putc().

Referenced by usart_putdata_xmd().

void usart_close

(

void

)

Close the given USART.

Stops the USART.

References usart_disable(), usart_disable_transceiver(), usart_sam_ba, USART_TRANSCEIVER_RX, and USART_TRANSCEIVER_TX.

int usart_getc

(

void

)

Waits and gets a value on usart line.

Returns

value read on usart line

References usart_is_rx_ready(), usart_read_wait(), and usart_sam_ba.

Referenced by getbytes(), getPacket(), putPacket(), usart_getdata(), usart_getdata_xmd(), usart_putdata_xmd(), and usart_sharp_received().

uint32_t usart_getdata	(	void *	data,
		uint32_t	length
	)

Get data from com device.

Gets data from usart line.

References usart_getc().

uint32_t usart_getdata_xmd	(	void *	data,
		uint32_t	length
	)

Called when a transfer from host to target is being made (considered an download).

Gets data from usart line using Xmodem protocol.

References ACK, CAN, CONF_CLOCK_GCLK_0_CLOCK_SOURCE, EOT, error_timeout, ESC, getPacket(), length, mode_of_transfer, PKTLEN_128, ptr_data, size_of_data, SOH, system_clock_source_get_hz(), usart_getc(), usart_is_rx_ready(), and usart_putc().

bool usart_is_rx_ready

(

void

)

This function checks if a character has been received on the usart line.

Returns

1 if a byte is ready to be read.

References BOOT_USART_MODULE.

Referenced by usart_getc(), usart_getdata_xmd(), and usart_sharp_received().

void usart_open

(

void

)

Open the given USART.

References b_sharp_received, usart_config::baudrate, BOOT_USART_BAUDRATE, BOOT_USART_GCLK_SOURCE, BOOT_USART_MODULE, BOOT_USART_MUX_SETTINGS, BOOT_USART_PAD2, BOOT_USART_PAD3, error_timeout, usart_config::generator_source, idx_rx_read, idx_rx_write, idx_tx_read, idx_tx_write, usart_config::mux_setting, usart_config::pinmux_pad0, usart_config::pinmux_pad1, usart_config::pinmux_pad2, usart_config::pinmux_pad3, STATUS_OK, usart_enable(), usart_enable_transceiver(), usart_get_config_defaults(), usart_init(), usart_sam_ba, USART_TRANSCEIVER_RX, and USART_TRANSCEIVER_TX.

Referenced by main().

int usart_putc

(

int

value

)

Puts a byte on usart line The type int is used to support printf redirection from compiler LIB.

Puts a byte on usart line.

Parameters

value

Value to put

Returns

1 if function was successfully done, otherwise 0.

References usart_sam_ba, and usart_write_wait().

Referenced by getPacket(), putPacket(), usart_getdata_xmd(), usart_putdata(), and usart_putdata_xmd().

uint32_t usart_putdata	(	void const *	data,
		uint32_t	length
	)

Send given data (polling)

Send buffer on usart line.

References i, length, and usart_putc().

uint32_t usart_putdata_xmd	(	void const *	data,
		uint32_t	length
	)

Called when a transfer from target to host is being made(considered an upload).

Send buffer on usart line using Xmodem protocol.

References ACK, CAN, EOT, error_timeout, length, mode_of_transfer, NAK, PKTLEN_128, ptr_data, putPacket(), size_of_data, usart_getc(), and usart_putc().

int usart_readc

(

void

)

Gets a value on usart line.

Returns

value read on usart line

References buffer_rx_usart, idx_rx_read, and USART_BUFFER_SIZE.

int usart_sharp_received

(

void

)

Returns true if the SAM-BA Uart received the sharp char.

Returns

Returns true if the SAM-BA Uart received the sharp char

References SHARP_CHARACTER, usart_getc(), and usart_is_rx_ready().

Referenced by main().

volatile uint8_t b_sharp_received

Referenced by usart_open().

volatile uint8_t buffer_rx_usart[USART_BUFFER_SIZE]

Referenced by usart_readc().

volatile uint8_t buffer_tx_usart[USART_BUFFER_SIZE]

uint8_t error_timeout

Referenced by getbytes(), getPacket(), usart_getdata_xmd(), usart_open(), and usart_putdata_xmd().

volatile uint8_t idx_rx_read

Referenced by usart_open(), and usart_readc().

volatile uint8_t idx_rx_write

Referenced by usart_open().

volatile uint8_t idx_tx_read

Referenced by usart_open().

volatile uint8_t idx_tx_write

Referenced by usart_open().

uint8_t mode_of_transfer

Referenced by getbytes(), putPacket(), usart_getdata_xmd(), and usart_putdata_xmd().

uint16_t size_of_data

Referenced by getbytes(), putPacket(), usart_getdata_xmd(), and usart_putdata_xmd().

struct usart_module usart_sam_ba

Referenced by usart_close(), usart_getc(), usart_open(), and usart_putc().