自学教程：C++ wdt_disable函数代码示例

static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg){	void __user *argp = (void __user *)arg;	int __user *p = argp;	int new_timeout;	static const struct watchdog_info ident = {		.options =		WDIOF_KEEPALIVEPING |					WDIOF_SETTIMEOUT |					WDIOF_MAGICCLOSE,		.firmware_version =	1,		.identity =		"W83697UG WDT",	};	switch (cmd) {	case WDIOC_GETSUPPORT:		if (copy_to_user(argp, &ident, sizeof(ident)))			return -EFAULT;		break;	case WDIOC_GETSTATUS:	case WDIOC_GETBOOTSTATUS:		return put_user(0, p);	case WDIOC_SETOPTIONS:	{		int options, retval = -EINVAL;		if (get_user(options, p))			return -EFAULT;		if (options & WDIOS_DISABLECARD) {			wdt_disable();			retval = 0;		}		if (options & WDIOS_ENABLECARD) {			wdt_ping();			retval = 0;		}		return retval;	}	case WDIOC_KEEPALIVE:		wdt_ping();		break;	case WDIOC_SETTIMEOUT:		if (get_user(new_timeout, p))			return -EFAULT;		if (wdt_set_heartbeat(new_timeout))			return -EINVAL;		wdt_ping();		/* Fall */	case WDIOC_GETTIMEOUT:		return put_user(timeout, p);	default:		return -ENOTTY;	}	return 0;}static int wdt_open(struct inode *inode, struct file *file){	if (test_and_set_bit(0, &wdt_is_open))		return -EBUSY;	/*	 *	Activate	 */	wdt_ping();	return nonseekable_open(inode, file);}static int wdt_close(struct inode *inode, struct file *file){	if (expect_close == 42)		wdt_disable();	else {		printk(KERN_CRIT PFX			"Unexpected close, not stopping watchdog!/n");		wdt_ping();	}	expect_close = 0;	clear_bit(0, &wdt_is_open);	return 0;}/* *	Notifier for system down */static int wdt_notify_sys(struct notifier_block *this, unsigned long code,	void *unused){	if (code == SYS_DOWN || code == SYS_HALT)		wdt_disable();	/* Turn the WDT off *///.........这里部分代码省略.........

	_start(void){	/*	 * Depending on the config parameter, enable or disable the WDT.	 */#if !defined(CONFIG_HW_WATCHDOG)#if !defined(CONFIG_SYS_M2S)	wdt_disable();#endif#else	wdt_enable();#endif	/*	 * Make sure interrupts are disabled.	 */	__disable_irq();#ifdef CONFIG_LPC18XX_NORFLASH_BOOTSTRAP_WORKAROUND	/*	 * Reload the whole U-Boot image from NOR flash.	 * The Boot ROM on LPC4350 parts cannot load more than 32KBytes	 * from NOR flash when booting.	 */	lpc18xx_bootstrap_from_norflash();#endif /* CONFIG_LPC18XX_NORFLASH_BOOTSTRAP_WORKAROUND */	/*	 * Copy data and initialize BSS	 * This is in lieu of the U-boot "conventional" relocation	 * of code & data from Flash to RAM.	 * With Cortex-M3, we execute from NVRAM (internal Flash),	 * having relocated data to internal RAM (and having cleared the BSS	 * area in internal RAM as well)	 * Stack grows downwards; the stack base is set-up by the first	 * value in the first word in the vectors.	 */	memcpy(&_data_start, &_data_lma_start, &_data_end - &_data_start);	memset(&_bss_start, 0, &_bss_end - &_bss_start);	/*	 * Copy RAMCODE separately, if it is separated	 */#if defined(CONFIG_MEM_RAMCODE_BASE) && defined(CONFIG_MEM_RAMCODE_LEN)	memcpy(&_ramcode_start, &_ramcode_lma_start,		&_ramcode_end - &_ramcode_start);#endif	/*	 * In U-boot (armboot) lingvo, "go to the C code" -	 * in fact, with M3, we are at the C code from the very beginning.	 * In actuality, this is the jump to the ARM generic start code.	 * ...	 * Note initialization of _armboot_start below. The ARM generic	 * code expects that this variable is set to the upper boundary of	 * the malloc pool area.	 * For Cortex-M3, where we do not relocate the code to RAM, I set	 * the malloc pool right behind the stack. See how armboot_start	 * is defined in the CPU specific .lds file.	 */	_armboot_start = (unsigned long)&_mem_stack_base;	start_armboot();}

static void __exit avila_wdt_exit(void){	misc_deregister(&avila_wdt_miscdev);	del_timer(&wdt_timer);	wdt_disable();}

int main(void) {    /* Watchdog */    wdt_reset();    wdt_disable();    /* Ports */    DDRB = _BV(PINB0) | _BV(PINB2) | _BV(PINB3) | _BV(PINB5);    DDRD = _BV(PIND5) | _BV(PIND7);    PORTB = 0xff; //& (_BV(PINB0));    PORTC = 0xff;    PORTD = 0xff;// & (_BV(PIND5) | _BV(PIND6) | _BV(PIND7));    /* Power saving */    set_sleep_mode(SLEEP_MODE_IDLE);    //b = fifoCreate(255);    vs1002Reset();    DDRD |= _BV(DDD1);    UCSR0B = _BV(TXEN0) | _BV(RXEN0); // | _BV(RXCIE0);    UBRR0L = 9;    /* SPI */    SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR1) | _BV(SPR0);    //SPSR = _BV(SPI2X);    // 0x8000 + 6144 = 0x9800, 12.288MHz XTAL + clk-doubling    /* Clock */    vs1002cmd_s();    SPDR = 0x02;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x03;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x98;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    vs1002cmd_e();    /* Mode: TEST */    vs1002cmd_s();    SPDR = 0x02;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x08;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x20; // Test    loop_until_bit_is_set(SPSR, SPIF);    vs1002cmd_e();    /* Volume */    vs1002cmd_s();    SPDR = 0x02;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x0b;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    vs1002cmd_e();    /* Test 1.500kHz sine */    vs1002data_s();    SPDR = 0x53;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0xef;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x6e;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x28;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x00;    loop_until_bit_is_set(SPSR, SPIF);    vs1002data_e();    uint8_t t;    for (t = 0; t < 125; t++) {        _delay_ms(2);    }    /* End test */    vs1002data_s();    SPDR = 0x45;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x78;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x69;    loop_until_bit_is_set(SPSR, SPIF);    SPDR = 0x74;    loop_until_bit_is_set(SPSR, SPIF);//.........这里部分代码省略.........

void WatchdogAVR::disable() {    // Disable the watchdog and clear any saved watchdog timer value.    wdt_disable();    _wdto = -1;}

int main(){ 	wdt_disable(); // no watchdog, just because I'm lazy    	// Configure I/O PORTS - All Digital Inputs (ARCADE)	DDRB = 0;	DDRC = 0;	DDRD = 0;	// Configure Pullups except for Pins PD2 and PD3	PORTB = 0xff;	PORTC = 0xff;	PORTD = 0xf3;      // 1 1 1 1 0 0 1 1		// Configure ADC	    ADMUX = (1<<REFS0 | 1<<ADLAR );  // AREF = AVcc, Left Justified    // 12000000/128 = 93750Hz      ADCSRA = (1<<ADEN)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);  // ADC Enable and prescaler of 128		 	// Configure timer 		TCCR1B = _BV(CS12) | _BV(CS11); // timer is initialized, used to keep track of idle period		// Start the show!	usbInit(); // start v-usb    usbDeviceDisconnect(); // enforce USB re-enumeration, do this while interrupts are disabled!	_delay_ms(250);    usbDeviceConnect();	    sei(); // enable interrupts		uint8_t to_send = 1; // boolean, true for first time		while (1)	{		usbPoll();				// Initialize the report IDs //		gamepad_report_1.report_id = 1;  // no ID is sent. All data shall be within 8 bytes				// Initialize report. No buttons pressed, directional at center		gamepad_report_1.buttons8_1=0;		gamepad_report_1.buttons12_9=0;				gamepad_report_1.vXaxis=0;		gamepad_report_1.vYaxis=0;				gamepad_report_1.vZaxis=0;		gamepad_report_1.vRXaxis=0;		gamepad_report_1.vRYaxis=0;				gamepad_report_1.vRZaxis=0;		 						// Populate Analog Axes         ADMUX = (ADMUX & 0xF8) | Xaxis; // Select X axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vXaxis = 127-ADCH;	        ADMUX = (ADMUX & 0xF8) | Yaxis; // Select Y axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vYaxis = 127-ADCH;		        ADMUX = (ADMUX & 0xF8) | Zaxis; // Select Z axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vZaxis = 127-ADCH;		        ADMUX = (ADMUX & 0xF8) | RXaxis; // Select RX axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vRXaxis = 127-ADCH;		        ADMUX = (ADMUX & 0xF8) | RYaxis; // Select RY axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vRYaxis = 127-ADCH;		        ADMUX = (ADMUX & 0xF8) | RZaxis; // Select RZ axis 		ADCSRA |= (1<<ADSC); // start single convertion		while(ADCSRA & (1<<ADSC)); // wait for conversion to complete				gamepad_report_1.vRZaxis = 127-ADCH;		// Populate buttons 1-7		if ( B3 ) gamepad_report_1.buttons8_1	+= 1;			if ( B4 ) gamepad_report_1.buttons8_1	+= 2;				if ( B5 ) gamepad_report_1.buttons8_1	+= 4;			if ( B6 ) gamepad_report_1.buttons8_1	+= 8;				if ( B7 ) gamepad_report_1.buttons8_1	+= 16;			if ( B8 ) gamepad_report_1.buttons8_1	+= 32;			if ( B9 ) gamepad_report_1.buttons8_1	+= 64;			if ( A9 ) gamepad_report_1.buttons8_1	+= 128;		// Populate buttons 12-9		if ( A8 ) gamepad_report_1.buttons12_9	+= 1;			if ( A7 ) gamepad_report_1.buttons12_9	+= 2;				if ( A6 ) gamepad_report_1.buttons12_9	+= 4;			if ( A5 ) gamepad_report_1.buttons12_9	+= 8;//.........这里部分代码省略.........

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