upsd3300_adc.lst

增强型8位单片机upsd33xx系列芯片PWM结合ADC例程

C51 COMPILER V7.50   UPSD3300_ADC                                                          07/11/2005 15:30:33 PAGE 1   


C51 COMPILER V7.50, COMPILATION OF MODULE UPSD3300_ADC
OBJECT MODULE PLACED IN upsd3300_adc.OBJ
COMPILER INVOKED BY: C:\keil\C51\BIN\C51.EXE upsd3300_adc.c OPTIMIZE(9,SIZE) BROWSE DEBUG OBJECTEXTEND

line level    source

   1          /*------------------------------------------------------------------------------
   2          upsd3300_adc.c
   3          
   4          Version:
   5          August 2004 Version 2.0 - Updated include file names, modified comments, and 
   6          removed Turbo from function names.
   7          
   8          Dependencies: None.
   9          
  10          Description:
  11          The uPSD3300 ADC device driver is intended to provide functions to initialize
  12          and read the analog to digital converter for the uPSD family.
  13          See uPSD3300_adc.h for function proto types.
  14          
  15          
  16          Copyright (c) 2004 STMicroelectronics Inc.
  17          
  18          This example demo code is provided as is and has no warranty,
  19          implied or otherwise.  You are free to use/modify any of the provided
  20          code at your own risk in your applications with the expressed limitation
  21          of liability (see below) so long as your product using the code contains
  22          at least one uPSD product (device).
  23          
  24          LIMITATION OF LIABILITY:   NEITHER STMicroelectronics NOR ITS VENDORS OR 
  25          AGENTS SHALL BE LIABLE FOR ANY LOSS OF PROFITS, LOSS OF USE, LOSS OF DATA,
  26          INTERRUPTION OF BUSINESS, NOR FOR INDIRECT, SPECIAL, INCIDENTAL OR
  27          CONSEQUENTIAL DAMAGES OF ANY KIND WHETHER UNDER THIS AGREEMENT OR
  28          OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  29          ------------------------------------------------------------------------------*/
  30          
  31          #include <intrins.h>
  32          
  33          #include "upsd3300.h"
  34          #include "upsd3300_hardware.h"
  35          #include "upsd3300_adc.h"
  36          
  37          #if (FREQ_OSC > 20000)                      // Set up ADC Prescaler Divider
  38                #define ADC_CLOCK_DIVIDER 1
  39          #else 
                    #define ADC_CLOCK_DIVIDER 0
              #endif
  42          
  43          
  44          /*------------------------------------------------------------------------------
  45          ADC_EnableAll()
  46          
  47          This function enables all the ADC channels and sets the ADC Clock frequency.
  48          ------------------------------------------------------------------------------*/
  49          void ADC_EnableAll() 
  50          {
  51   1          ACON = 0;                           // Turn off ADC
  52   1      
  53   1          P1SFS0 = 0xFF;
  54   1          P1SFS1 = 0xFF;                      // Setup P1 Port corresponding pin as AD input
  55   1      
C51 COMPILER V7.50   UPSD3300_ADC                                                          07/11/2005 15:30:33 PAGE 2   

  56   1          ADCPS =(0x08 + ADC_CLOCK_DIVIDER);  // Enable ADC clock, setup ADC clock freq
  57   1          _nop_();
  58   1          ACON = 0x20;                        // Enable ADC
  59   1      
  60   1          // NOTE: USER CODE MUST WAIT AT LEAST 20 MS before calling ADC_Read (Using the ADC)
  61   1      }
  62          
  63          
  64          
  65          /*------------------------------------------------------------------------------
  66          ADC_Init(channel)
  67          
  68          channel - unsigned char
  69                  - ADC channel to initialize (0 to 7)
  70          
  71          This function enables the specified ADC channel, initializes the ADC clock, and
  72          disables the ADC interrupt.  It must be called when the ADC channel is changed.
  73          ------------------------------------------------------------------------------*/
  74          void ADC_Init (unsigned char channel) 
  75          {
  76   1          unsigned char temp;
  77   1          ACON = 0;                           // Turn off ADC
  78   1      
  79   1          temp = (0x01) << channel;           // create channel bit pattern
  80   1          P1SFS0 |= temp;         
  81   1          P1SFS1 |= temp;                     // Setup P1 Port corresponding pin as AD input
  82   1      
  83   1          ADCPS =(0x08 + ADC_CLOCK_DIVIDER);  // Enable ADC clock, setup ADC clock freq
  84   1          _nop_();
  85   1          ACON = 0x20;                        // Enable ADC
  86   1      
  87   1          // NOTE: USER CODE MUST WAIT AT LEAST 20 MS before calling ADC_Read (Using the ADC)
  88   1      }
  89          
  90          /*------------------------------------------------------------------------------
  91          ADC_Read(channel)
  92          
  93          This function reads the specified ADC channel and returns the result.  The ADC
  94          must be initialization first with ADC_Init() before calling this function.
  95          
  96          channel - unsigned char
  97                  - ADC channel to read (0 to 7)
  98          
  99          Returns:
 100          ADC result. 
 101          -------------------------------------------------------------------------------*/
 102          unsigned int ADC_Read( unsigned char channel )
 103          {
 104   1          unsigned int  temp_ADC_result;  
 105   1          ACON &= 0xE0;                           //Clears the input channels ~(00101110B) = (11010001B)
 106   1      
 107   1          ACON |= (channel<<2);                   //Setup Channel 
 108   1          _nop_ ();
 109   1          _nop_ ();   
 110   1      
 111   1          ACON |= 0x02;                           //Start ADC conversion
 112   1          _nop_ ();                               //delay 1 machine cycle: ADST: 1->0
 113   1      
 114   1          while( (ACON & 0x01) != 1 );            //Waits for Conversion complish
 115   1      
 116   1            // Note: For increased ADC accuracy, the while loop above should be
 117   1            //       replaced with code that puts the MCU into Idle mode via PCON
C51 COMPILER V7.50   UPSD3300_ADC                                                          07/11/2005 15:30:33 PAGE 3   

 118   1            //       and makes use of the ADC interrupt to exit the Idle mode.
 119   1            //       The user would need to enable the ADC int and define the ADC ISR.
 120   1      
 121   1          temp_ADC_result = (ADAT1<<8)+ADAT0;     //Calculate ADC conversion result
 122   1      
 123   1          return (temp_ADC_result);
 124   1      }
 125          
 126          
 127          
 128          
 129          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     80    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)