ADC

#include "adc.h"

/* 
** CC2541 ADC引脚分别是P0.0~P07
*/
unsigned int Read_Vddvalue(unsigned char channel)
{
  unsigned int value;

  
  ADCCFG |= BV(channel);
  
  ADCCON3 = (channel|HAL_ADC_DEC_064|HAL_ADC_REF_AVDD);
  while (!(ADCCON1 & HAL_ADC_EOC));
  
  ADCCFG &= (BV(channel) ^ 0xFF);
  value = ADCL;
  value |= ((unsigned int)ADCH)<<8;

  return (value>>8);
  
}

//头文件===================================================
#ifndef __ADC_H__
#define __ADC_H__

#include "all.h"


/* Resolution */
#define HAL_ADC_RESOLUTION_8       0x01
#define HAL_ADC_RESOLUTION_10      0x02
#define HAL_ADC_RESOLUTION_12      0x03
#define HAL_ADC_RESOLUTION_14      0x04

/* Channels */
#define HAL_ADC_CHANNEL_0          0x00
#define HAL_ADC_CHANNEL_1          0x01
#define HAL_ADC_CHANNEL_2          0x02
#define HAL_ADC_CHANNEL_3          0x03
#define HAL_ADC_CHANNEL_4          0x04
#define HAL_ADC_CHANNEL_5          0x05
#define HAL_ADC_CHANNEL_6          0x06
#define HAL_ADC_CHANNEL_7          0x07

#define HAL_ADC_CHN_AIN0    0x00    /* AIN0 */
#define HAL_ADC_CHN_AIN1    0x01    /* AIN1 */
#define HAL_ADC_CHN_AIN2    0x02    /* AIN2 */
#define HAL_ADC_CHN_AIN3    0x03    /* AIN3 */
#define HAL_ADC_CHN_AIN4    0x04    /* AIN4 */
#define HAL_ADC_CHN_AIN5    0x05    /* AIN5 */
#define HAL_ADC_CHN_AIN6    0x06    /* AIN6 */
#define HAL_ADC_CHN_AIN7    0x07    /* AIN7 */
#define HAL_ADC_CHN_A0A1    0x08    /* AIN0,AIN1 */
#define HAL_ADC_CHN_A2A3    0x09    /* AIN2,AIN3 */
#define HAL_ADC_CHN_A4A5    0x0a    /* AIN4,AIN5 */
#define HAL_ADC_CHN_A6A7    0x0b    /* AIN6,AIN7 */
#define HAL_ADC_CHN_GND     0x0c    /* GND */
#define HAL_ADC_CHN_VREF    0x0d    /* Positive voltage reference */
#define HAL_ADC_CHN_TEMP    0x0e    /* Temperature sensor */
#define HAL_ADC_CHN_VDD3    0x0f    /* VDD/3 */
#define HAL_ADC_CHN_BITS    0x0f    /* Bits [3:0] */

#define HAL_ADC_CHANNEL_TEMP       HAL_ADC_CHN_TEMP
#define HAL_ADC_CHANNEL_VDD        HAL_ADC_CHN_VDD3   /* channel VDD divided by 3 */

/* Vdd Limits */
#define HAL_ADC_VDD_LIMIT_0        0x00
#define HAL_ADC_VDD_LIMIT_1        0x01
#define HAL_ADC_VDD_LIMIT_2        0x02
#define HAL_ADC_VDD_LIMIT_3        0x03
#define HAL_ADC_VDD_LIMIT_4        0x04
#define HAL_ADC_VDD_LIMIT_5        0x05
#define HAL_ADC_VDD_LIMIT_6        0x06
#define HAL_ADC_VDD_LIMIT_7        0x07

/* Reference Voltages */
#define HAL_ADC_REF_125V          0x00    /* Internal Reference (1.25V-CC2430)(1.15V-CC2540) */
#define HAL_ADC_REF_AIN7          0x40    /* AIN7 Reference */
#define HAL_ADC_REF_AVDD          0x80    /* AVDD_SOC Pin Reference */
#define HAL_ADC_REF_DIFF          0xc0    /* AIN7,AIN6 Differential Reference */
#define HAL_ADC_REF_BITS          0xc0    /* Bits [7:6] */


#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

unsigned int Read_Vddvalue(unsigned char channel);


#endif

//例子==========================================
void DelayMS(uint16 msec)
{ 
    uint16 i,j;
    
    for (i=0; i<msec; i++)
        for (j=0; j<536; j++);
}
void main(void)
{   
  char p_buf[]="hello world\r\n";
  char buf[30];
  unsigned int data;
  CLKCONCMD &= ~0x40;               //设置系统时钟源为32MHZ晶振
  while(CLKCONSTA & 0x40);          //等待晶振稳定
  CLKCONCMD &= ~0x47;               //设置系统主时钟频率为32MHZ   

  InitGPIO();
  Uart_Init(UART_BAUDRATE_115200);
  Uart_String(p_buf);
  while(1)                     //死循环
  {
    data = Read_Vddvalue(HAL_ADC_CHANNEL_7);
    sprintf(buf,"v=%d\r\n",data);
    Uart_String(buf);
    DelayMS(1000);
  }    
}

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