cc1000pic.c

CC1000/CC1050的接口说明和源代码

  PALE=1;
  
  Data=addr<<1;
  PALE=0;
    
  // Send address bits
  for (BitCounter=0;BitCounter<7;BitCounter++)
  {
    PCLK=1;
    PDATA_OUT=MSB;
    Data=Data<<1;
    PCLK=0;
  }
  // Send read/write bit 
  // Ignore bit in data, always use 0 
  
  PCLK=1;
  PDATA_OUT=0;
  PCLK=0;
 
 
  PCLK=1;
  PALE=1;
    
  // Receive data bits 
  
  PDATA_OUT=1;
   
  TRISC|=0x20; // Set up PDATA as an input
    
  for (BitCounter=0;BitCounter<8;BitCounter++)
  {
    PCLK=0;
    Data=Data<<1;
    LSB=PDATA_IN;
    PCLK=1;
  }
  
  
  TRISC&=~0x20; // Set up PDATA as an output again
  
  return Data;
}

#endif
  
/****************************************************************************/
/*  This routine resets the CC1000, clearing all registers.                 */
/****************************************************************************/  

void ResetCC1000(void)
{
  char MainValue;
  
  MainValue=ReadFromCC1000Register(CC1000_MAIN);
  WriteToCC1000Register(CC1000_MAIN,MainValue & 0xFE);         // Reset CC1000
  WriteToCC1000Register(CC1000_MAIN,MainValue | 0x01);         // Bring CC1000 out of reset
}


/****************************************************************************/
/*  This routine calibrates the CC1000                                      */
/*  Returns 0 if calibration fails, non-zero otherwise. Checks the LOCK     */
/*  to check for success.                                                   */
/****************************************************************************/

char CalibrateCC1000(void)
{
  int TimeOutCounter;

  WriteToCC1000Register(CC1000_PA_POW,0x00); // Turn off PA to avoid spurs
                                             // during calibration in TX mode
  WriteToCC1000Register(CC1000_CAL,0xA6); // Start calibration
  
  // Wait for calibration complete
  for(TimeOutCounter=CAL_TIMEOUT; ((ReadFromCC1000Register(CC1000_CAL)&0x08)==0)&&(TimeOutCounter>0); TimeOutCounter--);

  WriteToCC1000Register(CC1000_CAL,0x26); /* End calibration */
  WriteToCC1000Register(CC1000_PA_POW,PA_VALUE); /* Restore PA setting */

  // Wait for lock
  for(TimeOutCounter=LOCK_TIMEOUT; ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==0)&&(TimeOutCounter>0); TimeOutCounter--);

  return ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==1);
}

/****************************************************************************/
/*  This routine puts the CC1000 into RX mode (from TX). When switching to  */
/*  RX from PD, use WakeupC1000ToRX first                                   */
/****************************************************************************/


char SetupCC1000RX(char RXCurrent,char RXPLL)
{
  int i;
  char lock_status;

  WriteToCC1000Register(CC1000_MAIN,0x11);    // Switch into RX, switch to freq. reg A
  WriteToCC1000Register(CC1000_PLL,RXPLL);   // Use RX refdiv setting
  WriteToCC1000Register(CC1000_CURRENT,RXCurrent); // Program VCO current for RX

  // Wait 250us before monitoring LOCK
  for (i=0;i<0x1000;i++);

  // Wait for lock
  for(i=LOCK_TIMEOUT; ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==0)&&(i>0); i--);

  // If PLL in lock
  if ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==0x01){
    // Indicate PLL in LOCK
    lock_status = LOCK_OK;
  // Else (PLL out of LOCK)
  }else{
    // If recalibration ok
    if(CalibrateCC1000()){
      // Indicate PLL in LOCK
      lock_status = LOCK_RECAL_OK;
    // Else (recalibration failed)
    }else{
      // Reset frequency syncthesizer (ref.: Errata Note 01)
      ResetFreqSynth();
      // Indicate PLL out of LOCK
      lock_status = LOCK_NOK;
    }
  }

  // Return LOCK status to application
  return (lock_status);
}

/****************************************************************************/
/*  This routine puts the CC1000 into TX mode (from RX). When switching to  */
/*  TX from PD, use WakeupCC1000ToTX first                                  */
/****************************************************************************/

char SetupCC1000TX(char TXCurrent, char TXPLL)
{
  int i;
  char lock_status;

  WriteToCC1000Register(CC1000_PA_POW,0x00);   // Turn off PA to avoid frequency splatter

  WriteToCC1000Register(CC1000_MAIN,0xE1);    // Switch into TX, switch to freq. reg B
  WriteToCC1000Register(CC1000_PLL,TXPLL);   // Use TX refdiv setting
  WriteToCC1000Register(CC1000_CURRENT,TXCurrent); // Program VCO current for TX

  // Wait 250us before monitoring LOCK
  for (i=0;i<0x1000;i++);
 
  // Wait for lock
  for(i=LOCK_TIMEOUT; ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==0x00)&&(i>0); i--);

  // If PLL in lock
  if ((ReadFromCC1000Register(CC1000_LOCK)&0x01)==0x01){
    // Indicate PLL in LOCK
    lock_status = LOCK_OK;
  // Else (PLL out of LOCK)
  }else{
    // If recalibration ok
    if(CalibrateCC1000()){
      // Indicate PLL in LOCK
      lock_status = LOCK_RECAL_OK;
    // Else (recalibration failed)
    }else{
      // Reset frequency syncthesizer (ref.: Errata Note 01)
      ResetFreqSynth();
      // Indicate PLL out of LOCK
      lock_status = LOCK_NOK;
    }
  }

  // Increase output power
  WriteToCC1000Register(CC1000_PA_POW,PA_VALUE); // Restore PA setting

  // Return LOCK status to application
  return (lock_status);
}

/****************************************************************************/
/*  This routine puts the CC1000 into power down mode. Use WakeUpCC1000ToRX */
/*  followed by SetupCC1000RX or WakeupCC1000ToTX followed by SetupCC1000TX */
/*  to wake up from power down                                              */
/****************************************************************************/

void SetupCC1000PD(void)
{
  WriteToCC1000Register(CC1000_MAIN,0x3F);    // Put CC1000 into power-down
  WriteToCC1000Register(CC1000_PA_POW,0x00);  // Turn off PA to minimise current draw
}

/****************************************************************************/
/*  This routine wakes the CC1000 up from PD mode to RX mode, call          */
/*  SetupCC1000RX after this routine is finished.                           */
/****************************************************************************/

void WakeUpCC1000ToRX(char RXCurrent, char RXPLL)
{
  int i;
  
  
  WriteToCC1000Register(CC1000_MAIN,0x3B);  // Turn on xtal oscillator core
  WriteToCC1000Register(CC1000_CURRENT,RXCurrent); // Program VCO current for RX 
  WriteToCC1000Register(CC1000_PLL,RXPLL); // Use RX refdiv setting
  
  // Insert wait routine here, must wait for xtal oscillator to stabilise, 
  // typically takes 2-5ms.
  for (i=0;i<0x7FFE;i++);
  
  WriteToCC1000Register(CC1000_MAIN,0x39);  // Turn on bias generator
  // Wait for 250us, insert wait loop here
  WriteToCC1000Register(CC1000_MAIN,0x31);  // Turn on frequency synthesiser
}

/****************************************************************************/
/*  This routine wakes the CC1000 up from PD mode to TX mode, call          */
/*  SetupCC1000TX after this routine is finished.                           */
/****************************************************************************/

void WakeUpCC1000ToTX(char TXCurrent,char TXPLL)
{
  int i;

  WriteToCC1000Register(CC1000_MAIN,0xFB);  // Turn on xtal oscillator core
  WriteToCC1000Register(CC1000_CURRENT,TXCurrent); // Program VCO current for TX
  WriteToCC1000Register(CC1000_PLL,TXPLL); // Use TX refdiv setting
  
  // Insert wait routine here, must wait for xtal oscillator to stabilise, 
  // typically takes 2-5ms. 
  for (i=0;i<0x7FFE;i++);
  
  WriteToCC1000Register(CC1000_MAIN,0xF9);  // Turn on bias generator
  // Wait for 250us, insert wait loop here
  WriteToCC1000Register(CC1000_PA_POW,PA_VALUE); // Turn on PA
  WriteToCC1000Register(CC1000_MAIN,0xF1);  // Turn on frequency synthesiser
}

/****************************************************************************/
/*  This routine locks the averaging filter of the CC1000                   */
/****************************************************************************/

void AverageManualLockCC1000(void)
{
  WriteToCC1000Register(CC1000_MODEM1,0x19);
}

/****************************************************************************/
/*  This routine unlocks the averaging filter of the CC1000                 */
/****************************************************************************/

void AverageFreeRunCC1000(void)
{
  WriteToCC1000Register(CC1000_MODEM1,0x09);
}

/****************************************************************************/
/*  This routine sets up the averaging filter of the CC1000 for automatic   */
/*  lock. This can be used in polled receivers.                             */
/****************************************************************************/

void AverageAutoLockCC1000(void)
{
  WriteToCC1000Register(CC1000_MODEM1,0x01);
}

/****************************************************************************/
/*  This routine reads the current calibration values from the CC1000       */
/****************************************************************************/

void ReadCurrentCalibration(char *val1, char *val2)
{
  *val1=ReadFromCC1000Register(CC1000_TEST0);
  *val2=ReadFromCC1000Register(CC1000_TEST2);
}

/****************************************************************************/
/*  This routine overrides the current calibration of the CC1000            */
/****************************************************************************/

void OverrideCurrentCalibration(char val1, char val2)
{
  WriteToCC1000Register(CC1000_TEST5,(val1&0x0F)|0x10);
  WriteToCC1000Register(CC1000_TEST6,(val2&0x1F)|0x20);
}

/****************************************************************************/
/*  This routine stops override of the CC1000 calibration values            */
/****************************************************************************/

void StopOverridingCalibration(void)
{
  WriteToCC1000Register(CC1000_TEST5,0x00);
  WriteToCC1000Register(CC1000_TEST6,0x00);
}

/****************************************************************************/
/*  This routine resets the CC1000 frequency synthesizer                    */
/****************************************************************************/
void ResetFreqSynth(void)
{
  char modem1_value;
  modem1_value = ReadFromCC1000Register(CC1000_MODEM1)&~0x01;
  WriteToCC1000Register(CC1000_MODEM1,modem1_value);
  WriteToCC1000Register(CC1000_MODEM1,modem1_value|0x01);
}