cycle_counter_example.c File Reference

CPU Cycle Counter Example application for AVR UC3.

Copyright (c) 2013-2018 Microchip Technology Inc. and its subsidiaries.

#include <stdint.h>
#include <stdbool.h>
#include <asf.h>

Macros
#define	_ASSERT_ENABLE_
Example configuration
#define	EXAMPLE_DELAY_MS   100
	Delay period between COMPARE interrupts given in milliseconds. More...

Functions
int	main (void)
	Application main loop. More...
	Set_sys_compare (Get_sys_count()+delay_clock_cycles)

Variables
static volatile bool	compare_isr_fired = true
	Flag to indicate that the ISR has fired. More...
static volatile uint32_t	delay_clock_cycles
	Number of clock cycles representing the EXAMPLE_DELAY_MS. More...
static volatile uint32_t	number_of_compares = 0
	Counter to store the number for COMPARE interrupts. More...

#define _ASSERT_ENABLE_

#define EXAMPLE_DELAY_MS   100

Delay period between COMPARE interrupts given in milliseconds.

Note

Example delay -> 100 ms in this example.

Referenced by main().

int main

(

void

)

Application main loop.

Main function sets the COMPARE register and enables the interrupt for COMPARE match. On every COMPARE match interrupt, a message is displayed and LEDS are switched ON alternatively.

References Assert, AVR32_CORE_COMPARE_IRQ, compare_isr_fired, cpu_irq_disable, cpu_irq_enable, cpu_ms_2_cy(), delay_clock_cycles, EXAMPLE_DELAY_MS, Get_sys_compare, Get_sys_count, init_dbg_rs232(), irq_initialize_vectors, irq_register_handler, LED0, LED1, LED2, LED3, LED_Display_Field(), LED_Toggle(), max, number_of_compares, print_dbg(), print_dbg_ulong(), Set_sys_compare(), sysclk_get_cpu_hz(), sysclk_get_pba_hz(), and sysclk_init().

Set_sys_compare

(

Get_sys_count()+

delay_clock_cycles

)

Referenced by main().

compare_isr_fired = true

static

Flag to indicate that the ISR has fired.

COUNT/COMPARE match interrupt handler.

Interrupt handler to set a flag on COUNT COMPARE match and reloads the COMPARE register.

Referenced by main().

volatile uint32_t delay_clock_cycles

static

Number of clock cycles representing the EXAMPLE_DELAY_MS.

Referenced by main().

volatile uint32_t number_of_compares = 0

static

Counter to store the number for COMPARE interrupts.

Referenced by main().