Example to illustrate the Sleepwalking feature with the ADCIFB module in AT32UC3L series.

#include <stdint.h>
#include "compiler.h"
#include "board.h"
#include "conf_example.h"
#include "adcifb.h"
#include "gpio.h"
#include "ast.h"
#include "scif_uc3l.h"
#include "pm_uc3l.h"
#include "intc.h"
#include "sysclk.h"
#include "sleepmgr.h"
#include "delay.h"
#include "status_codes.h"

Macros
APPLICATION SPECIFIC CONFIGURATION
#define	DEBUG_MESSAGES DISABLE
	Enable Trace messages through USART terminal. More...

#define	STATUS_LED LED1_GPIO
	LED1_GPIO is used as status LED. More...

#define	ERROR_LED LED0_GPIO
	LED0_GPIO is used as error status LED. More...

#define	LED_DELAY 10
	Delay in ms for LED blinking. More...

#define	POWER_SUPPLY_MODE_1_8V false
	Enable when operated in 1.8V VDDIN. More...

#define	ADC &AVR32_ADCIFB
	ADCIFB Module is used. More...

#define	ADC_FREQUENCY 250000
	ADCIFB Clock Frequency - 1 MHz. More...

#define	ADC_INTERRUPT_PRIORITY 1
	ADCIFB interrupt priority is set to 1. More...

#define	ADC_SAMPLE_HOLD_TIME 4
	ADCIFB sample & hold time configuration - 0 Sample & Hold Time = (ADC_SAMPLE_HOLD_TIME + 3)* Tclk_adc. More...

#define	ADC_COMPARE_VALUE 0x200
	ADCIFB compare value in Analog Compare Mode - 1.5V. More...

#define	ADC_STARTUP_TIME 0
	ADCIFB startup time configuration - 0 Tstartup = (ADC_STARTUP_TIME + 1) * 8 * Tclk_adc (assuming Tstartup ~ 15us max) -> 1 * 8 * 1/250000 = 32us. More...

#define	AST_CLOCK_SOURCE AST_OSC_32KHZ
	32KHz external oscillator is used as AST source More...

#define	AST_PRESCALER AST_PSEL_32KHZ_1HZ
	Prescaler is set to AST_PSEL_32KHZ_1HZ to run at 1Hz. More...

#define	AST_TRIGGER_PRESCALER 13
	Periodic interrupt prescaler is set to 12 for trigger in every 250ms. More...

#define	NB_GPIO_USED_PINS 5

Functions
static status_code_t	adc_init (void)
	Initializes the ADCIFB module with trigger. More...

static status_code_t	ast_init (void)
	Initialize Asynchronous Timer to trigger ADCIFB module at regular intervals. More...

	ISR (ADCIFB_interrupt_handler, AVR32_ADCIFB_IRQ_GROUP, ADC_INTERRUPT_PRIORITY)
	ADCIFB ISR Routine. More...

int	main (void)
	Main Application Routine. More...

static void	power_save_measures_init (void)
	Initializes the power saving measures to reduce power consumption. More...

Variables
static uint32_t	adc_output
	Static variable to store the ADCIFB output value. More...

volatile avr32_adcifb_t *	adcifb = ADC
	Global variable to Store the ADCIFB module address. More...

static volatile unsigned int	cycle_cnt

uint32_t	gpio_used_pins [NB_GPIO_USED_PINS]
	Array to hold the used GPIO pins. More...

#define ADC &AVR32_ADCIFB

ADCIFB Module is used.

#define ADC_COMPARE_VALUE 0x200

ADCIFB compare value in Analog Compare Mode - 1.5V.

Referenced by adc_init().

#define ADC_FREQUENCY 250000

ADCIFB Clock Frequency - 1 MHz.

Referenced by adc_init().

#define ADC_INTERRUPT_PRIORITY 1

ADCIFB interrupt priority is set to 1.

Referenced by adc_init().

#define ADC_SAMPLE_HOLD_TIME 4

ADCIFB sample & hold time configuration - 0 Sample & Hold Time = (ADC_SAMPLE_HOLD_TIME + 3)* Tclk_adc.

Referenced by adc_init().

#define ADC_STARTUP_TIME 0

ADCIFB startup time configuration - 0 Tstartup = (ADC_STARTUP_TIME + 1) * 8 * Tclk_adc (assuming Tstartup ~ 15us max) -> 1 * 8 * 1/250000 = 32us.

Referenced by adc_init().

#define AST_CLOCK_SOURCE AST_OSC_32KHZ

32KHz external oscillator is used as AST source

Referenced by ast_init().

#define AST_PRESCALER AST_PSEL_32KHZ_1HZ

Prescaler is set to AST_PSEL_32KHZ_1HZ to run at 1Hz.

Referenced by ast_init().

#define AST_TRIGGER_PRESCALER 13

Periodic interrupt prescaler is set to 12 for trigger in every 250ms.

Referenced by ast_init().

#define DEBUG_MESSAGES DISABLE

Enable Trace messages through USART terminal.

#define ERROR_LED LED0_GPIO

LED0_GPIO is used as error status LED.

Referenced by main().

#define LED_DELAY 10

Delay in ms for LED blinking.

Referenced by main().

#define NB_GPIO_USED_PINS 5

#define POWER_SUPPLY_MODE_1_8V false

Enable when operated in 1.8V VDDIN.

#define STATUS_LED LED1_GPIO

LED1_GPIO is used as status LED.

Referenced by main().

static status_code_t adc_init ( )

static

Initializes the ADCIFB module with trigger.

Initialize the trigger mode & compare interrupts for ADCIFB

Return values

STATUS_OK	Configuration OK
ERR_TIMEOUT	Timeout on configuring ADCIFB module
ERR_BUSY	ADCIFB module unable to configure the trigger

References ADC_COMPARE_VALUE, ADC_FREQUENCY, ADC_INTERRUPT_PRIORITY, ADC_SAMPLE_HOLD_TIME, ADC_STARTUP_TIME, adcifb, adcifb_channels_enable(), adcifb_configure(), adcifb_configure_trigger(), adcifb_enable_analog_compare_mode(), adcifb_enable_compare_gt_interrupt(), adcifb_set_high_compare_value(), cpu_irq_disable, ERR_BUSY, ERR_TIMEOUT, EXAMPLE_ADCIFB_CHANNEL, EXAMPLE_ADCIFB_FUNCTION, EXAMPLE_ADCIFB_PIN, gpio_disable_pin_pull_up(), gpio_enable_module(), irq_initialize_vectors, irq_register_handler, adcifb_opt_t::resolution, STATUS_OK, SYSCLK_ADCIFB, sysclk_enable_pba_module(), and sysclk_get_pba_hz().

Referenced by main().

static status_code_t ast_init ( )

static

Initialize Asynchronous Timer to trigger ADCIFB module at regular intervals.

Asynchronous Timer Initialization.

Start the 32KHz Oscillator
Initializes the AST module with periodic trigger events

Return values

STATUS_OK	Configuration OK
ERR_TIMEOUT	Error in configuring the AST module

References ast_clear_all_status_flags(), AST_CLOCK_SOURCE, ast_enable(), ast_enable_periodic0(), ast_init_counter(), AST_PRESCALER, ast_set_periodic0_value(), AST_TRIGGER_PRESCALER, BOARD_OSC32_PINSEL, ERR_TIMEOUT, scif_osc32_opt_t::mode, OSC32_STARTUP_8192, SCIF_OSC_MODE_2PIN_CRYSTAL_HICUR, scif_start_osc32(), STATUS_OK, SYSCLK_AST, sysclk_disable_pba_module(), sysclk_enable_hsb_module(), sysclk_enable_pba_module(), and SYSCLK_EVENT.

Referenced by main().

ISR	(	ADCIFB_interrupt_handler	,
		AVR32_ADCIFB_IRQ_GROUP	,
		ADC_INTERRUPT_PRIORITY
	)

ADCIFB ISR Routine.

References adc_output, adcifb, adcifb_clear_compare_gt_interrupt_flag(), and adcifb_get_last_data().

int main ( void )

Main Application Routine.

Initialize the system clocks
Initialize the sleep manager
Initialize the power save measures
Initialize the ADCIFB module
Initialize the AST to trigger ADCIFB at regular intervals
Go to STATIC sleep mode and wake up on a touch status change

References adc_init(), adc_output, ast_clear_all_status_flags(), ast_init(), DBG_USART, delay_init, delay_ms, ERROR_LED, gpio_clr_gpio_pin(), gpio_set_gpio_pin(), gpio_tgl_gpio_pin(), init_dbg_rs232(), LED_DELAY, pm_asyn_wake_up_disable(), pm_asyn_wake_up_enable(), power_save_measures_init(), print_dbg(), print_dbg_hex(), sleepmgr_enter_sleep(), sleepmgr_init(), sleepmgr_lock_mode(), SLEEPMGR_STATIC, STATUS_LED, STATUS_OK, sysclk_disable_pba_module(), sysclk_enable_pba_module(), sysclk_enable_peripheral_clock(), sysclk_get_cpu_hz(), sysclk_get_pba_hz(), SYSCLK_GPIO, and sysclk_init().

static void power_save_measures_init ( )

static

Initializes the power saving measures to reduce power consumption.

Low Power Configuration Initializes the power saving measures to reduce power consumption.

Enable pullups on GPIO pins
Disable the clocks to unused modules
Disable internal voltage regulator when in 1.8V supply mode

References gpio_configure_group(), GPIO_DIR_INPUT, GPIO_PULL_UP, gpio_used_pins, sysclk_disable_cpu_module(), and SYSCLK_OCD.

Referenced by main().

uint32_t adc_output

static

Static variable to store the ADCIFB output value.

Referenced by ISR(), and main().

volatile avr32_adcifb_t* adcifb = ADC

Global variable to Store the ADCIFB module address.

Referenced by adc_init(), and ISR().

volatile unsigned int cycle_cnt

static

uint32_t gpio_used_pins[NB_GPIO_USED_PINS]

Initial value:

= {
    EXAMPLE_ADCIFB_PIN,
    STATUS_LED,
    ERROR_LED,
    AVR32_SCIF_XIN32_0_PIN,
    AVR32_SCIF_XOUT32_0_PIN
}

Array to hold the used GPIO pins.

Referenced by power_save_measures_init().

Microchip® Advanced Software Framework

Macros

Functions

Variables