adc.c

ti-Chipcon CC2430 zigbee Soc应用开发源码实例。包括rf,powermodes,clockmodes底层驱动源码。有了这些实例,包括误码率测试等。对你更好的理解和应用这颗芯片

/******************************************************************************
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Filename:     adc.c
Target:       cc2430
Author:       KJA
Revised:      16/12-2005
Revision:     1.0

Description:
    This application shows how to use the AD-converter (single sample mode).

    When the potmeter at the Evaluation Board is turned, the output voltage is
    sampled, converted and written to LCD. The blinking speed of the green and
    yellow LEDs is adjusted according to the voltage.
    The direction of the joystick is shown on the LCD.

******************************************************************************/
#include "stdio.h"
#include "lcd.h"
// Prototypes
void initAdc(void);
void adc_main(void);
void updateVoltageLCD(int8 potVoltage, int8 adc_value);
void updateJoystickDirectionLCD(JOYSTICK_DIRECTION direction);
void updateCounter(int8 delay);
int8 scaleValue(int8 adc_value);


/******************************************************************************
* @fn  initAdc
*
* @brief
*      Initializes components for use with the ADC application example (e.g.
*      LEDs, PotMeter, Joystick).
*
* Parameters:
*
* @param  void
*
* @return void
*
******************************************************************************/
void initAdc(void)
{
   initLcd();

   SET_MAIN_CLOCK_SOURCE(CRYSTAL);

   //init LEDs
   INIT_GLED();
   INIT_YLED();

   INIT_POT();
   INIT_JOYSTICK();
}


/******************************************************************************
* @fn  adc_main
*
* @brief
*      Main function of the ADC application example.
*
* Parameters:
*
* @param  void
*
* @return void
*
******************************************************************************/
void main(void){
   int8  adc_value;
   uint8 potVoltage = 0;
   bool updateLCD = TRUE;

   initAdc();

   while(1){

      ADC_ENABLE_CHANNEL(7);
      ADC_SINGLE_CONVERSION(ADC_REF_AVDD | ADC_8_BIT | ADC_AIN7);
      ADC_SAMPLE_SINGLE();

      while(!ADC_SAMPLE_READY());

      ADC_DISABLE_CHANNEL(7);

      adc_value = ADCH;

      if (potVoltage != scaleValue(adc_value)){
         //potVoltage changed since last sample
         potVoltage = scaleValue(adc_value);
         updateLCD = TRUE;
      }

      if (updateLCD){
         updateVoltageLCD(potVoltage, adc_value);
         updateLCD = FALSE;
      }
      updateCounter(adc_value);
   }
}


/******************************************************************************
* @fn  updateCounter
*
* @brief
*      Function for updating counting speed for binary counter
*
* Parameters:
*
* @param  int8  delay
*         New counting delay
*
* @return void
*
******************************************************************************/
void updateCounter(int8 delay)
{
   static uint8 counter = 0;
   uint16 i = 0;

   i = ((delay > 0) ? 0x7F - delay : 0x7F);
   halWait( i );

   counter++;

   SET_LED_MASK( (byte)counter );
}


/******************************************************************************
* @fn  scaleValue
*
* @brief
*      Function for scaling ADC value according to current VDD
*
* Parameters:
*
* @param  int8  adc_value
*         Sampled ADC value
*
* @return int8
*         Scaled value (output voltage)
*
******************************************************************************/
#define VDD 33
// return 10 times sampled voltage
int8 scaleValue(int8 adc_value)
{
   //0x0000 = 0V and 0x0F = 3.3V
   float v;

   adc_value = (adc_value > 0 ? adc_value : 0);
   v = ((float)adc_value / (float)0x7F);
   v *= VDD;
   return (int8)v;
}


/******************************************************************************
* @fn  updateVoltageLCD
*
* @brief
*      Function for printing PotVoltage and sampled ADC value to LCD.
*
* Parameters:
*
* @param  int8  potVoltage
*         Potmeter voltage
*
*         int8 adc_value
*         Sampled ADC value
*
* @return void
*
******************************************************************************/
void updateVoltageLCD(int8 potVoltage, int8 adc_value)
{
   char s[16];
   // potVoltage is 10 times correct voltage
   // print dc value on LCD
   sprintf(s, (char*)"%d.%d Volt (%d)",  ((int16)(potVoltage / 10)), ((int16)(potVoltage % 10)), adc_value);
   lcdUpdate((char*)"Voltage is:", s);
}