sam/utils/cmsis/cm4_nvic_example/main.c File Reference

NVIC Example.

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

#include "asf.h"
#include "conf_board.h"
#include "stdio_serial.h"

Macros
#define	INT_PRIOR_HIGH   4
	Define interrupt priority (0-15). More...
#define	INT_PRIOR_LOW   6
#define	STRING_EOL   "\r"
#define	STRING_HEADER

Functions
static void	configure_buttons (void)
	Configure the push buttons. More...
static void	configure_console (void)
	Configure the Console UART. More...
static __INLINE void	delay_ticks (uint32_t ul_dly_ticks)
	Delay number of tick Systicks (happens roughly every 1 ms). More...
static void	display_menu (void)
	Display menu. More...
static void	Int1Handler (uint32_t ul_id, uint32_t ul_mask)
	Handler for INT1, rising edge interrupt. More...
static void	Int2Handler (uint32_t ul_id, uint32_t ul_mask)
	Handler for INT2, rising edge interrupt. More...
static __INLINE void	led_config (void)
	Configure LED pins. More...
int	main (void)
	Application entry point. More...
static void	set_interrupt_priority (uint8_t int1Prior, uint8_t int2Prior)
	Set interrupt priority of INT1 and INT2. More...

Variables
volatile uint32_t	g_ul_ms_ticks = 0

#define INT_PRIOR_HIGH   4

Define interrupt priority (0-15).

A higher level corresponds to a lower priority, so level 0 is the highest interrupt priority.

Referenced by main().

#define INT_PRIOR_LOW   6

Referenced by main().

#define STRING_EOL   "\r"

#define STRING_HEADER

Value:

"-- Cortex-M4 NVIC Example --\r\n" \
        "-- "BOARD_NAME" --\r\n" \
        "-- Compiled: "__DATE__" "__TIME__" --"STRING_EOL

Referenced by main().

static void configure_buttons ( void  )

static

Configure the push buttons.

Configure the PIOs as inputs and generate corresponding interrupt when the push buttons are pressed or released.

References Int1Handler(), Int2Handler(), pio_enable_interrupt(), and pio_set_debounce_filter().

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_PARITY, stdio_serial_init(), and sysclk_enable_peripheral_clock().

Referenced by main().

static __INLINE void delay_ticks ( uint32_t  ul_dly_ticks )

static

Delay number of tick Systicks (happens roughly every 1 ms).

Note: As the systick has the lowest priority, lower than the PIO, the systick is not used here.

Referenced by Int1Handler(), and Int2Handler().

static void display_menu ( void  )

static

Display menu.

Referenced by main().

static void Int1Handler ( uint32_t  ul_id, uint32_t  ul_mask  )

static

Handler for INT1, rising edge interrupt.

In INT1, it will trigger INT2.

References delay_ticks(), gpio_set_pin_high, gpio_set_pin_low, pio_disable_interrupt(), and pio_enable_interrupt().

Referenced by configure_buttons().

static void Int2Handler ( uint32_t  ul_id, uint32_t  ul_mask  )

static

Handler for INT2, rising edge interrupt.

References delay_ticks(), gpio_set_pin_high, gpio_set_pin_low, pio_disable_interrupt(), and pio_enable_interrupt().

Referenced by configure_buttons().

static __INLINE void led_config ( void  )

static

Configure LED pins.

References gpio_set_pin_high.

Referenced by main().

int main

(

void

)

Application entry point.

Returns

Unused (ANSI-C compatibility).

References board_init(), configure_buttons(), configure_console(), display_menu(), INT_PRIOR_HIGH, INT_PRIOR_LOW, led_config(), pmc_enable_periph_clk(), set_interrupt_priority(), STRING_HEADER, sysclk_init(), and uart_read().

static void set_interrupt_priority ( uint8_t  int1Prior, uint8_t  int2Prior  )

static

Set interrupt priority of INT1 and INT2.

Parameters

int1Prior	Priority of interrupt 1.
int2Prior	Priority of interrupt 2.

Steps to change the IRQ priority:

1. Disable the interrupt service handler.
2. Clear the pending interrupt service handler.
3. Set the new priority.
4. Enable the interrupt service handler.

Referenced by main().

volatile uint32_t g_ul_ms_ticks = 0