USART Serial example for SAM.

#include <string.h>
#include "asf.h"
#include "stdio_serial.h"
#include "conf_board.h"
#include "conf_clock.h"
#include "conf_example.h"

Macros
#define	ALL_INTERRUPT_MASK 0xffffffff
	All interrupt mask. More...

#define	BUFFER_SIZE 100
	Size of the receive buffer used by the PDC, in bytes. More...

#define	BYTE_TRANSFER 0
	USART FIFO transfer type definition. More...

#define	MAX_BUF_NUM 1
	Max buffer number. More...

#define	PDC_TRANSFER 1
	USART PDC transfer type definition. More...

#define	STRING_EOL "\r"

#define	STRING_HEADER

#define	TC_FREQ 1
	Timer counter frequency in Hz. More...

Functions
static void	configure_console (void)
	Configure UART for debug message output. More...

static void	configure_tc (void)
	Configure Timer Counter 0 (TC0) to generate an interrupt every 200ms. More...

static void	configure_usart (void)
	Configure USART in normal (serial rs232) mode, asynchronous, 8 bits, 1 stop bit, no parity, 115200 bauds and enable its transmitter and receiver. More...

static void	display_main_menu (void)
	Display main menu. More...

int	main (void)
	Application entry point for usart_serial example. More...

void	TC0_Handler (void)
	Interrupt handler for TC0. More...

static void	usart_clear (void)
	Reset the TX & RX, and clear the PDC counter. More...

void	USART_Handler (void)
	Interrupt handler for USART. More...

Variables
Pdc *	g_p_pdc
	Pointer to PDC register base. More...

pdc_packet_t	g_st_nextpacket

pdc_packet_t	g_st_packet
	PDC data packet. More...

static uint8_t	g_uc_transend_flag = 0
	Flag of one transfer end. More...

static uint8_t	gs_puc_buffer [2][BUFFER_SIZE]
	Receive buffer. More...

static uint8_t	gs_puc_nextbuffer [2][BUFFER_SIZE]
	Next Receive buffer. More...

static uint8_t	gs_uc_buf_num = 0
	Buffer number in use. More...

static uint8_t	gs_uc_trans_mode = PDC_TRANSFER
	Current transfer mode. More...

static uint32_t	gs_ul_read_buffer = 0
	Byte mode read buffer. More...

static uint32_t	gs_ul_size_buffer = BUFFER_SIZE
	Current bytes in buffer. More...

static uint32_t	gs_ul_size_nextbuffer = BUFFER_SIZE
	Current bytes in next buffer. More...

#define ALL_INTERRUPT_MASK 0xffffffff

All interrupt mask.

Referenced by configure_usart().

#define BUFFER_SIZE 100

Size of the receive buffer used by the PDC, in bytes.

Referenced by main(), TC0_Handler(), and USART_Handler().

#define BYTE_TRANSFER 0

USART FIFO transfer type definition.

Referenced by main().

#define MAX_BUF_NUM 1

Max buffer number.

Referenced by USART_Handler().

#define PDC_TRANSFER 1

USART PDC transfer type definition.

Referenced by main(), TC0_Handler(), and USART_Handler().

#define STRING_EOL "\r"

#define STRING_HEADER

Value:

"-- USART Serial Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

#define TC_FREQ 1

Timer counter frequency in Hz.

Referenced by configure_tc().

static void configure_console ( void )

static

Configure UART for debug message output.

References uart_rs232_options::baudrate, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

static void configure_tc ( void )

static

Configure Timer Counter 0 (TC0) to generate an interrupt every 200ms.

This interrupt will be used to flush USART input and echo back.

References pmc_enable_periph_clk(), sysclk_get_cpu_hz(), tc_enable_interrupt(), tc_find_mck_divisor(), TC_FREQ, tc_init(), and tc_write_rc().

Referenced by main().

static void configure_usart ( void )

static

Configure USART in normal (serial rs232) mode, asynchronous, 8 bits, 1 stop bit, no parity, 115200 bauds and enable its transmitter and receiver.

References ALL_INTERRUPT_MASK, SAM4L, sysclk_enable_peripheral_clock(), sysclk_get_peripheral_hz(), usart_disable_interrupt(), usart_enable_rx(), usart_enable_tx(), and usart_init_rs232().

Referenced by main().

static void display_main_menu ( void )

static

Display main menu.

Referenced by main().

int main ( void )

Application entry point for usart_serial example.

Returns: Unused (ANSI-C compatibility).

References board_init(), BUFFER_SIZE, BYTE_TRANSFER, configure_console(), configure_tc(), configure_usart(), display_main_menu(), g_p_pdc, gs_puc_buffer, gs_puc_nextbuffer, gs_uc_buf_num, gs_uc_trans_mode, gs_ul_size_buffer, gs_ul_size_nextbuffer, pdc_disable_transfer(), pdc_enable_transfer(), pdc_rx_init(), PDC_TRANSFER, STRING_HEADER, sysclk_init(), tc_start(), uart_read(), pdc_packet::ul_addr, pdc_packet::ul_size, usart_clear(), usart_disable_interrupt(), usart_enable_interrupt(), and usart_get_pdc_base().

void TC0_Handler ( void )

Interrupt handler for TC0.

Record the number of bytes received, and then restart a read transfer on the USART if the transfer was stopped.

References BUFFER_SIZE, g_p_pdc, g_uc_transend_flag, gs_uc_trans_mode, gs_ul_size_buffer, gs_ul_size_nextbuffer, pdc_read_rx_counter(), pdc_read_rx_next_counter(), pdc_rx_clear_cnt(), PDC_TRANSFER, and tc_get_status().

static void usart_clear ( void )

static

Reset the TX & RX, and clear the PDC counter.

References g_p_pdc, pdc_rx_init(), pdc_packet::ul_addr, pdc_packet::ul_size, usart_enable_rx(), usart_enable_tx(), usart_reset_rx(), and usart_reset_tx().

Referenced by main().

void USART_Handler ( void )

Interrupt handler for USART.

Echo the bytes received and start the next receive.

References BUFFER_SIZE, g_p_pdc, g_uc_transend_flag, gs_puc_buffer, gs_puc_nextbuffer, gs_uc_buf_num, gs_uc_trans_mode, gs_ul_read_buffer, gs_ul_size_buffer, gs_ul_size_nextbuffer, MAX_BUF_NUM, pdc_rx_init(), PDC_TRANSFER, pdc_tx_init(), tc_start(), tc_stop(), pdc_packet::ul_addr, pdc_packet::ul_size, usart_get_status(), usart_getchar(), and usart_write().

Pdc* g_p_pdc

Pointer to PDC register base.

pdc_packet_t g_st_nextpacket

pdc_packet_t g_st_packet

PDC data packet.

uint8_t g_uc_transend_flag = 0

static

Flag of one transfer end.

Referenced by TC0_Handler(), and USART_Handler().

uint8_t gs_puc_buffer[2][BUFFER_SIZE]

static

Receive buffer.

Referenced by main(), and USART_Handler().

uint8_t gs_puc_nextbuffer[2][BUFFER_SIZE]

static

Next Receive buffer.

Referenced by main(), and USART_Handler().

uint8_t gs_uc_buf_num = 0

static

Buffer number in use.

Referenced by main(), and USART_Handler().

uint8_t gs_uc_trans_mode = PDC_TRANSFER

static

Current transfer mode.

Referenced by main(), TC0_Handler(), and USART_Handler().

uint32_t gs_ul_read_buffer = 0

static

Byte mode read buffer.

Referenced by USART_Handler().

uint32_t gs_ul_size_buffer = BUFFER_SIZE

static

Current bytes in buffer.

Referenced by main(), TC0_Handler(), and USART_Handler().

uint32_t gs_ul_size_nextbuffer = BUFFER_SIZE

static

Current bytes in next buffer.

Referenced by main(), TC0_Handler(), and USART_Handler().

Microchip® Advanced Software Framework

Macros

Functions

Variables