pwm_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   PWM_ADC                                                               07/11/2005 15:30:31 PAGE 1   


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

line level    source

   1          /*------------------------------------------------------------------------------
   2          pwm_adc.c
   3          
   4          Version:
   5          August 2004 Version 2.0 - Updated include file names, modified comments.
   6          
   7          Description:
   8          This code demonstrates use of the PWM and ADC function blocks within the 
   9          uPSD3300 device.  A pulse width modulated signal output from the PWM circuit is
  10          tied to an RC circuit resulting in a DC voltage that is proportional to the 
  11          pulse width.  This DC voltage is input to an ADC channel and is read after each 
  12          time the pulse width out of the PWM is changed.  The PWM setting and the ADC
  13          value read is displayed on the LCD.
  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 "upsd3300.h"
  32          #include "upsd3300_hardware.h"
  33          #include "upsd3300_adc.h"
  34          #include "upsd3300_timer.h"
  35          #include "upsd3300_lcd.h"
  36          #include "upsd3300_pca-pwm.h"
  37          
  38          
  39          unsigned char idata  msg_buff[20];              // Buffer for LCD message
  40          xdata PSD_REGS PSD_reg _at_ PSD_REG_ADDR;       // Access PSD regs at CSIOP addr
  41          
  42          // Copy character string in code space to data space
  43          void init_msgbuff(unsigned char *dataptr, unsigned char *buffptr)
  44          {
  45   1          unsigned char i;
  46   1          unsigned char code * temp_addr;
  47   1          unsigned char * dest_addr;
  48   1      
  49   1          temp_addr =  (unsigned char code *) (dataptr);    // get text message addr from code space
  50   1          dest_addr = (unsigned char *) (buffptr);          // get data space buffer address
  51   1      
  52   1          for (i=0; i<20; i++)
  53   1          {
  54   2              * dest_addr++ =  * temp_addr++;  // copy the byte from code space to data space
  55   2          }
C51 COMPILER V7.50   PWM_ADC                                                               07/11/2005 15:30:31 PAGE 2   

  56   1      }
  57          
  58          
  59          
  60          main()
  61          {
  62   1          unsigned char k, ADC_channel;
  63   1          unsigned int ADC_result;
  64   1      
  65   1          //-----Enable peripheral I/O function-------------
  66   1          PSD_reg.VM |= 0x80;           //Enable peripheral I/O for DK3300 board
  67   1      
  68   1          //-----Initialize Timer 0-------------
  69   1          timer0_init(); 
  70   1      
  71   1          //-----Show demo information on LCD-------------
  72   1          lcd_init();
  73   1      
  74   1          PSD_reg.OMCMASK_AB = 0xF0;    // Mask off upper nibble of Output MacroCell register.
  75   1                                        // This allows writing a byte to OMC register to load 
  76   1                                        // 4-bit initial count to down-counter in PLD without
  77   1                                        // disturbing the upper 4-bits of OMC register
  78   1      
  79   1          PSD_reg.OMC_AB = 0x08;        // Load initial count of eight into down-counter in PLD.
  80   1                                        // This 4-bit counter will pulse pin PB4 each time 8 counts of
  81   1                                        // 8032 ALE pulses occur per logic equations. 
  82   1          printfLCD("PWM to ADC DEMO");//PWM to ADC DEMO
  83   1          delay_1sec();
  84   1          init_msgbuff("\nPWM=XX ADC=XXX\n", &msg_buff);  // Load msg_buff with text message
  85   1      
  86   1          k=0xf;                        // Init k to initial value
  87   1          ADC_channel=7;                // Select ADC channel 7
  88   1      
  89   1      
  90   1          ADC_Init(ADC_channel);        // Init ADC channel  
  91   1      
  92   1          delay_10ms();                 // Wait for ADC Auto Calibration
  93   1          delay_10ms();
  94   1      
  95   1      
  96   1      // Main loop to output PWM value and read/display ADC value
  97   1      
  98   1          while(1)
  99   1          {
 100   2              if (k == 0) k = 0xff;   // Fix overflow to 0 -> 0xFF
 101   2              if (k == 0xf) k = 0;    // Fix overflow to 0xF -> 0
 102   2      
 103   2              PWM_Mode1_Init(0, k);   //Set to PWM channel 0 output with k pulse width
 104   2      
 105   2              delay_1sec();           // wait for voltage to settle and user to read display
 106   2      
 107   2              ADC_result = ADC_Read(ADC_channel);
 108   2      
 109   2              msg_buff[5] = htoa_hi(k);                 // Display PWM pulse width value
 110   2              msg_buff[6] = htoa_lo(k);
 111   2      
 112   2              msg_buff[12] = htoa_lo(ADC_result>>8);    // Convert to ASCII hex to display
 113   2              msg_buff[13] = htoa_hi(ADC_result);
 114   2              msg_buff[14] = htoa_lo(ADC_result);
 115   2      
 116   2              printfLCD(msg_buff);                      //Display ADC channel and value on LCD
 117   2              k = k + 0x10;
C51 COMPILER V7.50   PWM_ADC                                                               07/11/2005 15:30:31 PAGE 3   

 118   2          }
 119   1      }
 120          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    224    ----
   CONSTANT SIZE    =     33    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----      15
   IDATA SIZE       =     20    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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