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_
#define	EXAMPLE_TOGGLE_PIN   AVR32_PIN_PA03
	Toggle PA03 GPIO in the example upon COMPARE interrupts. More...
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 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...
static volatile bool	toggle_gpio = false
	Flag to indicate that the GPIO line should be toggled. More...

#define _ASSERT_ENABLE_

#define EXAMPLE_DELAY_MS   100

Delay period between COMPARE interrupts given in milliseconds.

Example delay period between COMPARE interrupts given in milliseconds.

Referenced by main().

#define EXAMPLE_TOGGLE_PIN   AVR32_PIN_PA03

Toggle PA03 GPIO in the example upon COMPARE interrupts.

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 the GPIO line is toggled.

Note

Use No compiler optimization to visualize the variable updates using Watch Window

References Assert, AVR32_CORE_COMPARE_IRQ, cpu_irq_disable, cpu_irq_enable, cpu_ms_2_cy(), delay_clock_cycles, EXAMPLE_DELAY_MS, EXAMPLE_TOGGLE_PIN, Get_sys_compare, Get_sys_count, gpio_tgl_gpio_pin(), irq_initialize_vectors, irq_register_handler, Set_sys_compare(), sysclk_get_cpu_hz(), sysclk_init(), and toggle_gpio.

Set_sys_compare

(

Get_sys_count()+

delay_clock_cycles

)

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.

toggle_gpio = false

static

Flag to indicate that the GPIO line should be toggled.

COUNT/COMPARE match interrupt handler.

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

Referenced by main().