How can I use the ADC of CC2530?

HI Peder,

Thank you for replying my post. I think I found the code and examples of the ADC and GPIO.

Thank you for your help

HI Banharn,

Could you please share the code examples? I am having the same question about using the ADC to sample other signals other than voltage and temperature. 

Thanks,

Yanfeng

This code is copied from hal_adc.c, You can also install the latest Z-STACK.

 

/**************************************************************************************************

  Filename:       hal_adc.c

  Revised:        $Date: 2010-03-19 20:18:21 -0700 (Fri, 19 Mar 2010) $

  Revision:       $Revision: 21954 $

 

  Description:    This file contains the interface to the HAL ADC.

 

 

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**************************************************************************************************/

 

/**************************************************************************************************

 *                                           INCLUDES

 **************************************************************************************************/

 

#include  "hal_adc.h"

#include  "hal_defs.h"

#include  "hal_mcu.h"

#include  "hal_types.h"

 

/**************************************************************************************************

 *                                            CONSTANTS

 **************************************************************************************************/

#define HAL_ADC_EOC         0x80    /* End of Conversion bit */

#define HAL_ADC_START       0x40    /* Starts Conversion */

 

#define HAL_ADC_STSEL_EXT   0x00    /* External Trigger */

#define HAL_ADC_STSEL_FULL  0x10    /* Full Speed, No Trigger */

#define HAL_ADC_STSEL_T1C0  0x20    /* Timer1, Channel 0 Compare Event Trigger */

#define HAL_ADC_STSEL_ST    0x30    /* ADCCON1.ST =1 Trigger */

 

#define HAL_ADC_RAND_NORM   0x00    /* Normal Operation */

#define HAL_ADC_RAND_LFSR   0x04    /* Clock LFSR */

#define HAL_ADC_RAND_SEED   0x08    /* Seed Modulator */

#define HAL_ADC_RAND_STOP   0x0c    /* Stop Random Generator */

#define HAL_ADC_RAND_BITS   0x0c    /* Bits [3:2] */

 

#define HAL_ADC_DEC_064     0x00    /* Decimate by 64 : 8-bit resolution */

#define HAL_ADC_DEC_128     0x10    /* Decimate by 128 : 10-bit resolution */

#define HAL_ADC_DEC_256     0x20    /* Decimate by 256 : 12-bit resolution */

#define HAL_ADC_DEC_512     0x30    /* Decimate by 512 : 14-bit resolution */

#define HAL_ADC_DEC_BITS    0x30    /* Bits [5:4] */

 

#define HAL_ADC_STSEL       HAL_ADC_STSEL_ST

#define HAL_ADC_RAND_GEN    HAL_ADC_RAND_STOP

#define HAL_ADC_REF_VOLT    HAL_ADC_REF_AVDD

#define HAL_ADC_DEC_RATE    HAL_ADC_DEC_064

#define HAL_ADC_SCHN        HAL_ADC_CHN_VDD3

#define HAL_ADC_ECHN        HAL_ADC_CHN_GND

 

/* ------------------------------------------------------------------------------------------------

 *                                       Local Variables

 * ------------------------------------------------------------------------------------------------

 */

 

#if (HAL_ADC == TRUE)

static uint8 adcRef;

#endif

 

/**************************************************************************************************

 * @fn      HalAdcInit

 *

 * @brief   Initialize ADC Service

 *

 * @param   None

 *

 * @return  None

 **************************************************************************************************/

void HalAdcInit (void)

{

#if (HAL_ADC == TRUE)

  adcRef = HAL_ADC_REF_VOLT;

#endif

}

 

/**************************************************************************************************

 * @fn      HalAdcRead

 *

 * @brief   Read the ADC based on given channel and resolution

 *

 * @param   channel - channel where ADC will be read

 * @param   resolution - the resolution of the value

 *

 * @return  16 bit value of the ADC in offset binary format.

 *

 *          Note that the ADC is "bipolar", which means the GND (0V) level is mid-scale.

 *          Note2: This function assumes that ADCCON3 contains the voltage reference.

 **************************************************************************************************/

uint16 HalAdcRead (uint8 channel, uint8 resolution)

{

  int16  reading = 0;

 

#if (HAL_ADC == TRUE)

  uint8   i, resbits;

  uint8  adcChannel = 1;

 

  /*

   * If Analog input channel is AIN0..AIN7, make sure corresponing P0 I/O pin is enabled.  The code

   * does NOT disable the pin at the end of this function.  I think it is better to leave the pin

   * enabled because the results will be more accurate.  Because of the inherent capacitance on the

   * pin, it takes time for the voltage on the pin to charge up to its steady-state level.  If

   * HalAdcRead() has to turn on the pin for every conversion, the results may show a lower voltage

   * than actuality because the pin did not have time to fully charge.

   */

  if (channel < 8)

  {

    for (i=0; i < channel; i++)

    {

      adcChannel <<= 1;

    }

  }

 

  /* Enable channel */

  ADCCFG |= adcChannel;

 

  /* Convert resolution to decimation rate */

  switch (resolution)

  {

    case HAL_ADC_RESOLUTION_8:

      resbits = HAL_ADC_DEC_064;

      break;

    case HAL_ADC_RESOLUTION_10:

      resbits = HAL_ADC_DEC_128;

      break;

    case HAL_ADC_RESOLUTION_12:

      resbits = HAL_ADC_DEC_256;

      break;

    case HAL_ADC_RESOLUTION_14:

    default:

      resbits = HAL_ADC_DEC_512;

      break;

  }

 

  /* writing to this register starts the extra conversion */

  ADCCON3 = channel | resbits | adcRef;

 

  /* Wait for the conversion to be done */

  while (!(ADCCON1 & HAL_ADC_EOC));

 

  /* Disable channel after done conversion */

  ADCCFG &= (adcChannel ^ 0xFF);

 

  /* Read the result */

  reading = (int16) (ADCL);

  reading |= (int16) (ADCH << 8);

 

  /* Treat small negative as 0 */

  if (reading < 0)

    reading = 0;

 

  switch (resolution)

  {

    case HAL_ADC_RESOLUTION_8:

      reading >>= 8;

      break;

    case HAL_ADC_RESOLUTION_10:

      reading >>= 6;

      break;

    case HAL_ADC_RESOLUTION_12:

      reading >>= 4;

      break;

    case HAL_ADC_RESOLUTION_14:

    default:

      reading >>= 2;

    break;

  }

#else

  // unused arguments

  (void) channel;

  (void) resolution;

#endif

 

  return ((uint16)reading);

}

 

/**************************************************************************************************

 * @fn      HalAdcSetReference

 *

 * @brief   Sets the reference voltage for the ADC and initializes the service

 *

 * @param   reference - the reference voltage to be used by the ADC

 *

 * @return  none

 *

 **************************************************************************************************/

void HalAdcSetReference ( uint8 reference )

{

#if (HAL_ADC == TRUE)

  adcRef = reference;

#endif

}

 

/*********************************************************************

 * @fn      HalAdcCheckVdd

 *

 * @brief   Check for minimum Vdd specified.

 *

 * @param   vdd - The board-specific Vdd reading to check for.

 *

 * @return  TRUE if the Vdd measured is greater than the 'vdd' minimum parameter;

 *          FALSE if not.

 *

 *********************************************************************/

bool HalAdcCheckVdd(uint8 vdd)

{

  ADCCON3 = 0x0F;

  while (!(ADCCON1 & 0x80));

  return (ADCH > vdd);

}

 

/**************************************************************************************************

**************************************************************************************************/