C++ BV函数代码示例

/* Encrypt at most 16 bytes of data. */
static void
cipher16(uint8_t *data, int len)
{
  uint8_t status;

  len = MIN(len, MAX_DATALEN);

  CC2420_WRITE_RAM(data, CC2420RAM_SABUF, len);
  CC2420_STROBE(CC2420_SAES);
  /* Wait for the encryption to finish */
  do {
    CC2420_GET_STATUS(status);
  } while(status & BV(CC2420_ENC_BUSY));
  CC2420_READ_RAM(data, CC2420RAM_SABUF, len);
}

/*
 * \brief Read contents of PHY register.
 *
 * \param reg PHY register number.
 *
 * \return Contents of the specified register.
 */
static uint16_t phy_hw_read(uint8_t phy_addr, reg8_t reg)
{
	// PHY read command.
	EMAC_MAN = EMAC_SOF | EMAC_RW_READ
		| ((phy_addr << EMAC_PHYA_SHIFT) & EMAC_PHYA)
		| ((reg  << EMAC_REGA_SHIFT) & EMAC_REGA)
		| EMAC_CODE;

	// Wait until PHY logic completed.
	while (!(EMAC_NSR & BV(EMAC_IDLE)))
		cpu_relax();

	// Get data from PHY maintenance register.
	return (uint16_t)(EMAC_MAN & EMAC_DATA);
}

/*
 * Initialize SPI bus.
 */
void
spi_init(void)
{
  static unsigned char spi_inited = 0;

  if (spi_inited)
    return;

  /* Initalize ports for communication with SPI units. */
  /* CSN=SS and must be output when master! */
  DDRB  |= BV(MOSI) | BV(SCK) | BV(CSN);
  PORTB |= BV(MOSI) | BV(SCK);

  /* Enables SPI, selects "master", clock rate FCK / 2, and SPI mode 0 */
  SPCR = BV(SPE) | BV(MSTR);
  SPSR = BV(SPI2X);
}

/**************************************************************************************************
 *
 * @fn      timer_start_timerEx
 *
 * @brief   Modeled after OSAL_start_timerEx.
 * 			To stop timer call with same threadId, and event, and
 * 			set timeout to 0.
 *
 * @param   threadId - Id of the thread to call at the event.
 * @param	event - event bitmask
 * @param	timeout - number of milliseconds to count down
 *
 * @return  void
 */
uint8 timer_start_timerEx(uint8 threadId, uint32 event, uint32 timeout)
{
	uint8 i;
	if (event == 0)
	{
		// No event requested, just return
		return -1;
	}
	for (i = 0; i < 32; i++)
	{
		if (event & BV(i))
			break;
	}

	LOG_DEBUG_TIMER("[TIMER] timer_start_timerEx(%d, 0x%.8X, %d)... \n", threadId, event, timeout);
	fflush(LOG_DESTINATION_FP);
	// To avoid race conditions we cannot update timerThreadTbl without mutex lock
	pthread_mutex_lock(&timerMutex);
	LOG_DEBUG_TIMER("lock (line: %d)\n", __LINE__);

	// Value is stored in us for better precision
	timerThreadTbl[threadId].timeoutValue[i] = timeout * 1000;
	// Use a 0 value of timeout to disable timer
	if (timeout)
	{
		// Enable event
		timerThreadTbl[threadId].timerEnabled |= event;
		// We also need to make sure the timer update does not decrement now.
		timerThreadTbl[threadId].justKicked |= event;
	}
	else
	{
		timerThreadTbl[threadId].timerEnabled &= ~event;
		// Clear event in case it just fired.
		timer_clear_event(threadId, event);
	}

	LOG_DEBUG_TIMER("[TIMER] Timer started for %dus, for event 0x%.8X and thread %d\n",
			(int)timerThreadTbl[threadId].timeoutValue[i], event, threadId);

	// Unlock mutex before notifying timer thread
	pthread_mutex_unlock(&timerMutex);

	// Notify timer thread that timer has been set
	pthread_cond_signal(&timerSetCond);

	return 1;
}

void NRF24L01_Initialize(uint8_t baseConfig)
{
    standbyConfig = BV(NRF24L01_00_CONFIG_PWR_UP) | baseConfig;
    NRF24_CE_LO();
    // nRF24L01+ needs 100 milliseconds settling time from PowerOnReset to PowerDown mode
    static const uint32_t settlingTimeUs = 100000;
    const uint32_t currentTimeUs = micros();
    if (currentTimeUs < settlingTimeUs) {
        delayMicroseconds(settlingTimeUs - currentTimeUs);
    }
    // now in PowerDown mode
    NRF24L01_WriteReg(NRF24L01_00_CONFIG, standbyConfig); // set PWR_UP to enter Standby mode
    // nRF24L01+ needs 4500 microseconds from PowerDown mode to Standby mode, for crystal oscillator startup
    delayMicroseconds(4500);
    // now in Standby mode
}

void
cc2420_off(void)
{
  u8_t spiStatusByte;

  if (receive_on == 0)
    return;
  receive_on = 0;
  /* Wait for transmission to end before turning radio off. */
  do {
    spiStatusByte = cc2420_status();
  } while (spiStatusByte & BV(CC2420_TX_ACTIVE));

  cc2420_strobe(CC2420_SRFOFF);
  DISABLE_FIFOP_INT();
}

static void
on(void)
{
  if(completely_off) {
    completely_off = 0;
    powerup();
    configure();
  }
  CC2420_ENABLE_FIFOP_INT();
  strobe(CC2420_SRXON);

  BUSYWAIT_UNTIL(status() & (BV(CC2420_XOSC16M_STABLE)), RTIMER_SECOND / 100);

  ENERGEST_ON(ENERGEST_TYPE_LISTEN);
  receive_on = 1;
}

int
compile_preamble(int *instructions, struct local *s)
{
    int *instp;
    int len;
    int extra_regs, i, j, t, disp;

    extra_regs = s->maxreg - INITIAL_NSCRATCHREGS;
    if (extra_regs > 0) {
	len = extra_regs * 2 + 4;
	/* stw rp | (n-1) * stw | bl | stw | ldw rp | (n-1) * ldw | bv | ldw */
    } else
	return 0;
    if (instructions == NULL)
	return len;
    instp = instructions;
    /* Generate a wrapper function to save the callee-saves registers
       before invoking the filter code we have generated.  It would be
       marginally better to have the filter branch directly to the
       postamble code on return, but the difference is trivial and it
       is easier to have it always branch to (rp).  */
#define FRAME_SIZE 128	/* This is plenty without being excessive. */
    *instp++ = STW_NEG(REG_RTN, 20, REG_SP);		/* stw rp,-20(sp) */
    i = INITIAL_NSCRATCHREGS;
    t = STWM(scratchregs[i], FRAME_SIZE, REG_SP);	/* stwm r3,128(sp) */
    j = FRAME_SIZE;
    while (++i < s->maxreg) {
	*instp++ = t;
	j -= sizeof (int);
	t = STW_NEG(scratchregs[i], j, REG_SP);		/* stw r4,-124(sp) &c */
    }
    disp = extra_regs + 2;	/* n * ldw | bv | ldw rp */
    *instp++ = BL(disp, REG_RTN);			/* bl filter,rp */
    *instp++ = t;					/* stw in delay slot */
    *instp++ = LDW_NEG(FRAME_SIZE + 20, REG_SP, REG_RTN);
							/* ldw -148(sp),rp */
    while (--i > INITIAL_NSCRATCHREGS) {
	*instp++ = LDW_NEG(j, REG_SP, scratchregs[i]);	/* ldw -124(sp),r4 &c */
	j += sizeof (int);
    }
    *instp++ = BV(0, REG_RTN);				/* bv (rp) */
    *instp++ = LDWM_NEG(FRAME_SIZE, REG_SP, scratchregs[i]);
							/* ldwm -128(sp),r3
							   in delay slot */
    assert(instp - instructions == len);
    return len;
}

void adc_init (void)
{
	adc_ch = 0;
	adc_ports[0] = ADC_VOLT;

	ADCSRA = BV(ADEN); /* enable ADC conversion */
	ADCSRA |= (BV(ADPS2) | BV(ADPS1) | BV(ADPS0)); /* div by 128 presc. */
	ADCSRA |= BV(ADIE); /* interrupt enable */
	ADMUX = adc_ports[adc_ch]; /* Voltage reference is AREF) */
	ADCSRA |= BV(ADSC); /* request ADC conversion */
}

void delegateSetCellStatus(uint8_t xCol){
	// Col -> set only one port as output low and all others as input full up
	DDRCOLUMNS  = BV(xCol);	// 해당 col을 출력으로 설정, 나머지 입력
	PORTCOLUMNS = ~BV(xCol);	// 해당 col output low, 나머지 컬럼을 풀업 저항

	/*
	DDR을 1로 설정하면 출력, 0이면 입력
	입력중, PORT가 1이면 풀업(풀업 상태는  high 상태);

	출력 상태의 PORT가 0이면 output low(0v);

	스위치를 on하면 0, off하면 1이 PIN에 저장;
	row는 내부 풀업 저항 상태 이기 때문에 1값이 기본값
	*/
				
	_delay_us(5);
}

//.........这里部分代码省略.........
    0xef,    //Normal maximum
    0xab,    //Normal minimum
    0xff,    //Sensor Maximum reading
    0x00,    //Sensor Minimum reading
    0xf7,    //Upper non-recoverable Threshold
    0xf2,    //Upper critical Threshold
    0xe9,    //Upper non critical Threshold
    //Byte 40
    0xa2,    //Lower non-recoverable Threshold
    0xa7,    //Lower critical Threshold
    0xab,    //Lower non-critical Threshold
    0x02,    //positive going Threshold hysteresis value
    0x02,    //negative going Threshold hysteresis value
    0x00,    //reserved
    0x00,    //reserved
    0x00,    //OEM reserved
    //Byte 48
    0xc3,    //8 bit ASCII, number of bytes
    '1', '2', 'V' //sensor string
};

u08 SDR7[] =
{
    //sensor record header
    0x05,       //record number, LSB  - filled by SDR_Init()
    0x00,       //record number, MSB  - filled by SDR_Init()
    0x51,       //IPMI protocol version
    0x02,       //record type: compact sensor
    0x23,       //record length: remaining bytes, SDR_Init

    //record key bytes
    0x00,       //i2c address, filled by SDR_Init
    0x00,       //sensor owner LUN
    FPGA_SLAVE, //sensor number

    //record body bytes
    //Byte 8
    0xc1,       //entity id: MCH
    0x00,       //entity instance, SDR_Init
    0x03,       //init: events + scanning enabled
    0xc2,       //capabilities: auto re-arm, global disable
    0x07,       //type: Power Supply(DC-to-DC converter)
    0x0a,       //sensor discrete event/read
    0x01,       //LSB assert event mask: 1 bit value
    0x00,       //MSB assert event mask
    0x01,       //LSB deassert event mask: 1 bit value
    0x00,       //MSB deassert event mask
    0x01,       //LSB read event mask: 1 bit value
    0x00,       //MSB read event mask
    0xc0,       //sensor units 1
    0x00,       //sensor units 2
    0x00,       //sensor units 3
    0x01,       //sharing: 1 sensor
    0x00,       //no entity instance string
    0x00,       //no positive threshold hysteresis
    0x00,       //no negative threshold hysteresis
    0x00,       //reserved
    0x00,       //reserved
    0x00,       //reserved
    0x00,       //OEM reserved
    0xca,       //8 bit ASCII, number of bytes
    'F', 'P', 'G', 'A', '_', 'S', 'L', 'A', 'V', 'E' //sensor string
};

u08 *sdrPtr[NUM_SDR] = {SDR0, SDR1, SDR2, SDR3, SDR4, SDR5, SDR6, SDR7};
u08 sdrLen[NUM_SDR] =  {sizeof(SDR0), sizeof(SDR1), sizeof(SDR2), sizeof(SDR3), sizeof(SDR4), sizeof(SDR5), sizeof(SDR6), sizeof(SDR7)};

sensor_t sens[NUM_SENSOR];

//******************/
void leds_init_user()    //Called from leds_init in led.c
//******************/
{
    led[USER_LED].local_cntr_fnc   = LED_OFF;
    led[USER_LED].fnc_off          = LED_OFF;
    led[USER_LED].on_duration      = 0;
    led[USER_LED].color            = RED;
    led[USER_LED].control_state    = LOCAL_CONTROL_STATE;
    local_led_control_user(USER_LED, LED_OFF);
}


//**************************/
u08 state_led_user(u08 led_n)   //Called from state_led in led.c
//**************************/
{
    if (led[led_n].control_state == OVERRIDE_STATE)
        return (0); //MJ: 0 = LED_OFF. Is this what we want in mmc_main.c? What is OVERRIDE_STATE used for?

    switch (led_n)
    {
    case USER_LED:
        if (inb(LED_USER_IN) & BV(LED_USER_PIN))    return LED_OFF;
        else                                        return LED_ON;
        break;
    default:
        break;
    }
    return (0xff); //MJ: mmc_main.c does not process this error. How could it react?
}

void spi_set_speed(spi_speed_t speed) {
  /* Wait until TX fifo is empty */
  while (!BITBAND(SSP_REGS->SR, 0)) ;

  /* Disable SSP (FIXME: Is this required?) */
  SSP_REGS->CR1 = 0;

  /* Change clock divisor */
  if (speed == SPI_SPEED_FAST) {
    SSP_REGS->CPSR = SSP_CLK_DIVISOR_FAST;
  } else {
    SSP_REGS->CPSR = SSP_CLK_DIVISOR_SLOW;
  }

  /* Enable SSP */
  SSP_REGS->CR1 = BV(1);
}

/*************************************************************
 * @fn        I2c_Read_Byte
 *
 * @brief     This func for read byte
 *            Make i2c data wire to be input
 * 
 * @param     none
 *
 * @return    uint8 
 */
uint8 I2c_Read_Byte( void )
{
  uint8 Num, Recv = 0;
  I2C_DAT = 1;
  P0DIR &= ~BV(0);    // Make i2c data wire to be input
  for(Num = 0; Num < 8; Num++)
  {
    I2C_CLK = 0; 
    delay_us(2);
    I2C_CLK = 1;
    Recv = (Recv << 1) | I2C_DAT;// delay_us(2);
   // I2C_CLK = 1; 
    delay_us(2);
  }
  P0DIR |= BV(0);     // Restore i2c data wire direction
  return Recv;
}

 void HalSPIWrite(uint32 addr, uint8 *pBuf, uint16 len)
{
  uint8 cnt;
  uint8 shdw = P1DIR;
  P1DIR |= BV(3);
  while (len)
  {
    XNV_SPI_BEGIN();
    do {
      xnvSPIWrite(XNV_STAT_CMD);
    } while (XNV_SPI_RX() & XNV_STAT_WIP);
    XNV_SPI_END();
    asm("NOP"); asm("NOP");

    XNV_SPI_BEGIN();
    xnvSPIWrite(XNV_WREN_CMD);
    XNV_SPI_END();
    asm("NOP"); asm("NOP");

    XNV_SPI_BEGIN();
    xnvSPIWrite(XNV_WRPG_CMD);
    xnvSPIWrite(addr >> 16);
    xnvSPIWrite(addr >> 8);
    xnvSPIWrite(addr);

    // Can only write within any one page boundary, so prepare for next page write if bytes remain.
    cnt = 0 - (uint8)addr;
    if (cnt)
    {
      addr += cnt;
    }
    else
    {
      addr += 256;
    }

    do
    {
      xnvSPIWrite(*pBuf++);
      cnt--;
      len--;
    } while (len && cnt);
    XNV_SPI_END();
  }
  P1DIR = shdw;
}

static void
off(void)
{
  /*  PRINTF("off\n");*/
  receive_on = 0;

  /* Wait for transmission to end before turning radio off. */
  BUSYWAIT_UNTIL(!(status() & BV(CC2520_TX_ACTIVE)), RTIMER_SECOND / 10);

  ENERGEST_OFF(ENERGEST_TYPE_LISTEN);
  strobe(CC2520_INS_SRFOFF);
  CC2520_DISABLE_FIFOP_INT();

  if(!CC2520_FIFOP_IS_1) {
    flushrx();
  }
}