wdt_example.c File Reference

Watchdog Timer (WDT) example for SAM.

Copyright (c) 2011-2018 Microchip Technology Inc. and its subsidiaries.

#include "asf.h"
#include "conf_board.h"
#include "led.h"
#include <stdio.h>

Macros
#define	BLINK_PERIOD   300
	LED blink time 300ms. More...
#define	PUSHBUTTON_FILTER_GLITCH_VAULE   10
	PIO debounce filter parameters 10 Hz. More...
#define	STRING_EOL   "\r"
#define	STRING_HEADER
#define	WDT_PERIOD   3000
	Watchdog period 3000ms. More...
#define	WDT_RESTART_PERIOD   2000
	Watchdog restart 2000ms. More...

Functions
static void	button_handler (uint32_t id, uint32_t mask)
	Handler for Button 1 rising edge interrupt. More...
static void	configure_button (void)
	Configure the Pushbutton. More...
static void	configure_console (void)
	Configure the Console UART. More...
static void	configure_led (void)
	Configure LED. More...
int	main (void)
	Application entry point for WDT example. More...
void	SysTick_Handler (void)
	Handler for System Tick interrupt. More...
void	WDT_Handler (void)
	Handler for watchdog interrupt. More...

Variables
volatile bool	g_b_button_event = false
	Pushbutton event flag. More...
volatile bool	g_b_systick_event = false
	System Tick event flag. More...
volatile uint32_t	g_ul_ms_ticks = 0
	System tick increased by 1 every millisecond. More...

#define BLINK_PERIOD   300

LED blink time 300ms.

Referenced by main().

#define PUSHBUTTON_FILTER_GLITCH_VAULE   10

PIO debounce filter parameters 10 Hz.

Referenced by configure_button().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"--Watchdog with IRQ Interrupt Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

#define WDT_PERIOD   3000

Watchdog period 3000ms.

Referenced by main().

#define WDT_RESTART_PERIOD   2000

Watchdog restart 2000ms.

Referenced by main().

static void button_handler ( uint32_t  id, uint32_t  mask  )

static

Handler for Button 1 rising edge interrupt.

Referenced by configure_button().

static void configure_button ( void  )

static

Configure the Pushbutton.

References button_handler(), pio_configure(), pio_set_debounce_filter(), pmc_enable_periph_clk(), and PUSHBUTTON_FILTER_GLITCH_VAULE.

Referenced by main().

static void configure_console ( void  )

static

Configure the Console UART.

References uart_rs232_options::baudrate, CONF_UART, CONF_UART_BAUDRATE, CONF_UART_CHAR_LENGTH, CONF_UART_PARITY, CONF_UART_STOP_BITS, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

static void configure_led ( void  )

static

Configure LED.

References pio_configure().

Referenced by main().

int main

(

void

)

Application entry point for WDT example.

Returns

Unused (ANSI-C compatibility).

References BLINK_PERIOD, BOARD_FREQ_SLCK_XTAL, board_init(), configure_button(), configure_console(), configure_led(), pio_enable_interrupt(), STRING_HEADER, sysclk_get_cpu_hz(), sysclk_init(), wdt_get_timeout_value(), wdt_get_us_timeout_period(), wdt_init(), WDT_INVALID_ARGUMENT, WDT_PERIOD, wdt_restart(), and WDT_RESTART_PERIOD.

void SysTick_Handler

(

void

)

Handler for System Tick interrupt.

void WDT_Handler

(

void

)

Handler for watchdog interrupt.

References wdt_get_status(), and wdt_restart().

volatile bool g_b_button_event = false

Pushbutton event flag.

volatile bool g_b_systick_event = false

System Tick event flag.

volatile uint32_t g_ul_ms_ticks = 0

System tick increased by 1 every millisecond.