System configuration procedures. More...

#include <avr/interrupt.h>
#include <avr/io.h>
#include <avr/wdt.h>
#include <util/delay.h>
#include "system.h"
#include "leds.h"

Include dependency graph for system.c:

Functions
void	configure_system_clock (void)
	Configures the system clock. More...

void	enable_usb_pll (void)
	Configures the PLL for USB operation. More...

void	panic (uint16_t delay_red_ms, uint16_t delay_green_ms)
	Stops program execution and blinks the on-board LEDs. More...

void	wdt_reenable (void)
	Re-enables the watchdog. More...

Detailed Description

System configuration procedures.

Function Documentation

void configure_system_clock ( void )

Configures the system clock.

Activates and selects the internal 32 MHz RC oscillator as system clock source.

void enable_usb_pll ( void )

Configures the PLL for USB operation.

Sets the PLL output frequency to 48 MHz, enables the PLL and waits until it has successfully locked.

Stops program execution and blinks the on-board LEDs.

Disables interrupts and watchdog and traps the program in an endless loop.

Parameters

delay_red_ms	blink interval of the red LED in [ms]
delay_green_ms	blink interval of the red LED in [ms]

void wdt_reenable ( void )

Re-enables the watchdog.