main.lst

AT89S8252, AT89S53 SPI Program, This program shows how to configure and use the SPI in master mode

C51 COMPILER V7.06   MAIN                                                                  05/30/2003 18:02:52 PAGE 1   


C51 COMPILER V7.06, COMPILATION OF MODULE MAIN
OBJECT MODULE PLACED IN main.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE main.c BROWSE DEBUG OBJECTEXTEND

stmt level    source

   1          #include <AT898252.H>
   2          #include <stdio.h>
   3          
   4          /*-----------------------------------------------------------------------------
   5          -----------------------------------------------------------------------------*/
   6          #define AT250X0_WREN_OPCODE     (0x06)
   7          #define AT250X0_WRDI_OPCODE     (0x04)
   8          #define AT250X0_RDSR_OPCODE     (0x05)
   9          #define AT250X0_WRSR_OPCODE     (0x01)
  10          #define AT250X0_READ_OPCODE(a)  ((((a) & 0x0100) >> 0x05) | 0x03)
  11          #define AT250X0_WRITE_OPCODE(a) ((((a) & 0x0100) >> 0x05) | 0x02)
  12          
  13          #define AT250X0_ADDRESS_LSB(a)  ((a) & 0x00FF)
  14          
  15          #define AT250X0_CS      P1_0
  16          
  17          #define AT250X0_STAT_BUSY       0x01
  18          #define AT250X0_STAT_WREN       0x02
  19          
  20          /*-----------------------------------------------------------------------------
  21          -----------------------------------------------------------------------------*/
  22          unsigned char read_status (void)
  23          {
  24   1      unsigned char stat;
  25   1      
  26   1      AT250X0_CS = 0;
  27   1      
  28   1      SPDR = AT250X0_RDSR_OPCODE;
  29   1      while ((SPSR & 0x80) == 0);
  30   1      
  31   1      SPDR = 0xFF;
  32   1      while ((SPSR & 0x80) == 0);
  33   1      stat = SPDR;
  34   1      
  35   1      AT250X0_CS = 1;
  36   1      
  37   1      return (stat);
  38   1      }
  39          
  40          /*-----------------------------------------------------------------------------
  41          -----------------------------------------------------------------------------*/
  42          void write_enable (
  43            unsigned char flag)
  44          {
  45   1      AT250X0_CS = 0;
  46   1      
  47   1      SPDR = (flag == 0) ? AT250X0_WRDI_OPCODE : AT250X0_WREN_OPCODE;
  48   1      while ((SPSR & 0x80) == 0);
  49   1      
  50   1      AT250X0_CS = 1;
  51   1      }
  52          
  53          /*-----------------------------------------------------------------------------
  54          -----------------------------------------------------------------------------*/
  55          void read_at250x0 (
C51 COMPILER V7.06   MAIN                                                                  05/30/2003 18:02:52 PAGE 2   

  56            unsigned address,
  57            unsigned char *buf,
  58            unsigned length)
  59          {
  60   1      AT250X0_CS = 0;
  61   1      
  62   1      SPDR = AT250X0_READ_OPCODE(address);
  63   1      while ((SPSR & 0x80) == 0);
  64   1      
  65   1      SPDR = AT250X0_ADDRESS_LSB(address);
  66   1      while ((SPSR & 0x80) == 0);
  67   1      
  68   1      while (length--)
  69   1        {
  70   2        SPDR = 0xFF;
  71   2        while ((SPSR & 0x80) == 0);
  72   2        *buf++ = SPDR;
  73   2        }
  74   1      
  75   1      AT250X0_CS = 1;
  76   1      }
  77          
  78          /*-----------------------------------------------------------------------------
  79          -----------------------------------------------------------------------------*/
  80          void write_at250x0 (
  81            unsigned address,
  82            unsigned char *buf,
  83            unsigned length)
  84          {
  85   1      write_enable (1);
  86   1      
  87   1      for (; length--; address++)
  88   1        {
  89   2        while (read_status () & AT250X0_STAT_BUSY);
  90   2      
  91   2        AT250X0_CS = 0;
  92   2      
  93   2        SPDR = AT250X0_WRITE_OPCODE(address);
  94   2        while ((SPSR & 0x80) == 0);
  95   2      
  96   2        SPDR = AT250X0_ADDRESS_LSB(address);
  97   2        while ((SPSR & 0x80) == 0);
  98   2      
  99   2        SPDR = *buf++;
 100   2        while ((SPSR & 0x80) == 0);
 101   2      
 102   2        AT250X0_CS = 1;
 103   2        }
 104   1      
 105   1      write_enable (0);
 106   1      }
 107          
 108          /*-----------------------------------------------------------------------------
 109          -----------------------------------------------------------------------------*/
 110          void main (void)
 111          {
 112   1      unsigned i;
 113   1      static unsigned char xdata buffer [20];
 114   1      
 115   1      /*-----------------------------------------------
 116   1      Initialize the serial port.
 117   1      -----------------------------------------------*/
C51 COMPILER V7.06   MAIN                                                                  05/30/2003 18:02:52 PAGE 3   

 118   1      SCON  = 0x50;
 119   1      TMOD |= 0x20;
 120   1      TH1   = 221;
 121   1      TR1   = 1;
 122   1      TI    = 1;
 123   1      
 124   1      /*-----------------------------------------------
 125   1      -----------------------------------------------*/
 126   1      SPCR = 0x53;   /* 01010011 */
 127   1      
 128   1      /*-----------------------------------------------
 129   1      -----------------------------------------------*/
 130   1      while (1)
 131   1        {
 132   2        write_at250x0 (0, "This is a test", 15);
 133   2        read_at250x0 (0, buffer, sizeof(buffer));
 134   2      
 135   2        for (i = 0; i < sizeof(buffer); i++)
 136   2          printf ("Buffer[%u]=%2.2X\n", (unsigned) i, (unsigned) buffer[i]);
 137   2        }
 138   1      
 139   1      /*-----------------------------------------------
 140   1      -----------------------------------------------*/
 141   1      }
 142          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    346    ----
   CONSTANT SIZE    =     33    ----
   XDATA SIZE       =     20    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----      16
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


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