USART hardware handshaking 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 125
	Size of the receive buffer used by the PDC, in bytes. More...

#define	MAX_BPS 500
	Maximum Bytes Per Second (BPS) rate that will be forced using the CTS pin. 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 to generate an interrupt every second. More...

static void	configure_usart (void)
	Configure board USART communication with PC or other terminal. More...

int	main (void)
	usart_hard_handshaking_example application entry point. More...

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

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

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

uint8_t	g_puc_string [BUFFER_SIZE]
	String g_uc_buffer. More...

pdc_packet_t	g_st_nextpacket

pdc_packet_t	g_st_packet
	PDC data packet. More...

uint8_t	g_uc_buffer
	Receive buffer. More...

volatile uint32_t	g_ul_bytes_received = 0
	Number of bytes received between two timer ticks. More...

static uint8_t	gs_dump_buffer [BUFFER_SIZE]
	Dump buffer. More...

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

static uint8_t	gs_puc_nextbuffer [BUFFER_SIZE]

#define ALL_INTERRUPT_MASK 0xffffffff

All interrupt mask.

Referenced by configure_usart().

#define BUFFER_SIZE 125

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

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

#define MAX_BPS 500

Maximum Bytes Per Second (BPS) rate that will be forced using the CTS pin.

Referenced by USART_Handler().

#define STRING_EOL "\r"

#define STRING_HEADER

Value:

"--USART Hardware Handshaking 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 to generate an interrupt every second.

Configure TC for a 1Hz frequency and trigger on RC compare.

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 board USART communication with PC or other terminal.

References ALL_INTERRUPT_MASK, NULL, sysclk_enable_peripheral_clock(), sysclk_get_peripheral_hz(), usart_disable_interrupt(), usart_enable_rx(), usart_enable_tx(), and usart_init_hw_handshaking().

Referenced by main().

int main ( void )

usart_hard_handshaking_example application entry point.

Returns: Unused (ANSI-C compatibility).

References board_init(), BUFFER_SIZE, configure_console(), configure_tc(), configure_usart(), g_p_pdc, gs_dump_buffer, gs_puc_buffer, gs_puc_nextbuffer, pdc_enable_transfer(), pdc_rx_init(), STRING_HEADER, sysclk_init(), tc_start(), uart_read(), pdc_packet::ul_addr, pdc_packet::ul_size, usart_enable_interrupt(), usart_get_pdc_base(), and usart_write_line().

void TC0_Handler ( void )

Interrupt handler for TC0.

Display the number of bytes received during the last second and the total number of bytes received, and then restart a read transfer on the USART if it was stopped.

References BUFFER_SIZE, g_p_pdc, g_puc_string, g_ul_bytes_received, gs_dump_buffer, gs_puc_buffer, gs_puc_nextbuffer, pdc_read_rx_counter(), pdc_read_rx_next_counter(), pdc_rx_init(), tc_get_status(), pdc_packet::ul_addr, pdc_packet::ul_size, usart_enable_interrupt(), and usart_write_line().