clock_masking_example.c File Reference

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Detailed Description

Clock masking example for the AVR32 UC3.

• Compiler: IAR EWAVR32 and GNU GCC for AVR32
• Supported devices: All AVR32 devices with a power manager.
• AppNote:

Author:

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Definition in file clock_masking_example.c.

#include <avr32/io.h>
#include "board.h"
#include "pm.h"
#include "gpio.h"

Include dependency graph for clock_masking_example.c:

Go to the source code of this file.

Defines
#define	CLOCK_DIV_OFF   0
#define	CLOCK_DIV_ON   1
#define	DIV_FOURTH   1
#define	DIV_HALF   0
Functions
int	main (void)
	main function : Disable/enable module clocks according to pressed button

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Define Documentation

#define CLOCK_DIV_OFF   0

Definition at line 89 of file clock_masking_example.c.

Referenced by main().

#define CLOCK_DIV_ON   1

Introduction

This example demonstrates the clock masking feature of AVR32 devices. Operating mode: Press button 0 to enable all clocks in the clock mask Press button 1 to disable all clocks on the PBB bus Press button 2 to turn off all modules on PBA exept PM/RTC/EIC and GPIO because we need them to enable the modules again (PM) and to signal the state with LEDs.

The LED signal following situations: LED0 = PBB clocks are active LED1 = All modules on PBA are clocked

Main Files

• pm.c: power manager driver;
• pm.h: power manager driver header file;
• gpio.c: gpio controller driver;
• gpio.h: gpio controller driver header file;
• clock_masking_example.c: Clock masking example application.

Compilation Information

This software is written for GNU GCC for AVR32 and for IAR Embedded Workbench for Atmel AVR32. Other compilers may or may not work.

Device Information

All AVR32 devices with GPIO controller.

Configuration Information

This example has been tested with the following configuration:

• EVK1100 evaluation kit;
• CPU clock: 12 MHz from oscillator 0;

Contact Information

For further information, visit Atmel AVR32.
Support and FAQ: http://support.atmel.no/

Definition at line 88 of file clock_masking_example.c.

Referenced by main().

#define DIV_FOURTH   1

Definition at line 91 of file clock_masking_example.c.

Referenced by main().

#define DIV_HALF   0

Definition at line 90 of file clock_masking_example.c.

Referenced by main().

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Function Documentation

int main

(

void

)

main function : Disable/enable module clocks according to pressed button

Definition at line 96 of file clock_masking_example.c.

References FOSC0, gpio_clr_gpio_pin(), gpio_get_pin_value(), GPIO_PUSH_BUTTON_0, GPIO_PUSH_BUTTON_1, GPIO_PUSH_BUTTON_2, gpio_set_gpio_pin(), LED0_GPIO, LED1_GPIO, OSC0_STARTUP, and pm_switch_to_osc0().

               {
        volatile avr32_pm_t *pm = &AVR32_PM;
        
        // set synchronous clock source to external oscillator 0
        pm_switch_to_osc0(&AVR32_PM, FOSC0, OSC0_STARTUP);
        
        gpio_clr_gpio_pin(LED0_GPIO);
        gpio_clr_gpio_pin(LED1_GPIO);
        
        while(1){
                
                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_0) == 0) {
                        // enable all module clocks on the different clock domains
                        pm->cpumask = 0xFFFFFFFF;
                        pm->hsbmask = 0xFFFFFFFF;
                        pm->pbamask = 0xFFFFFFFF;
                        pm->pbbmask = 0xFFFFFFFF;
                        
                        // Wait for ckrdy bit. Actually not needed here because no write or
                        // read action is performed to any module which clock was disabled
                        // before. 
                        while (!(pm->poscsr & AVR32_PM_POSCSR_CKRDY_MASK));
                        
                        gpio_clr_gpio_pin(LED0_GPIO);
                        gpio_clr_gpio_pin(LED1_GPIO);
                }
                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_1) == 0){
                        // turn off all modules on PBB
                        pm->pbbmask = 0x0;
                        gpio_set_gpio_pin(LED0_GPIO);
                }
                if(gpio_get_pin_value(GPIO_PUSH_BUTTON_2) == 0){
                        // turn off all modules on PBA exept PM/RTC/EIC and GPIO
                        // because we need them to enable the modules again (PM) and to signal
                        // the state withe LEDs
                        pm->pbamask = 0x0000000A;
                        gpio_set_gpio_pin(LED1_GPIO);
                }
                                
        }
        return 0;
}

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