spi_slave_no_ss.lst

我要做一个avr作为主控芯片的读卡器

C51 COMPILER V7.10   SPI_SLAVE_NO_SS                                                       04/30/2004 14:21:11 PAGE 1   


C51 COMPILER V7.10, COMPILATION OF MODULE SPI_SLAVE_NO_SS
OBJECT MODULE PLACED IN spi_slave_no_ss.OBJ
COMPILER INVOKED BY: C:\KEIL\C51\BIN\C51.EXE spi_slave_no_ss.c BROWSE DEBUG OBJECTEXTEND TABS(3)

line level    source

   1          /**
   2           * @file $RCSfile: spi_slave_no_ss.c,v $
   3           *
   4           * Copyright (c) 2004 Atmel.
   5           *
   6           * Please read file license.txt for copyright notice.
   7           *
   8           * @brief This file is an example to use spi in slave mode.
   9           *
  10           * This file can be parsed by Doxygen for automatic documentation
  11           * generation.
  12           * Put here the functional description of this file within the software
  13           * architecture of your program.
  14           *
  15           * @version $Revision: 1.0 $ $Name:  $
  16           */
  17          
  18          /* @section  I N C L U D E S */
  19          #include "reg_c51.h"
  20          
  21          bit transmit_completed;
  22          char serial_data;
  23          
  24          /**
  25           * FUNCTION_PURPOSE: This file set up spi in slave mode with 
  26           * Fclk Periph/128 as baud rate and without slave select pin.
  27           * FUNCTION_INPUTS: P1.5(MISO) serial input  
  28           * FUNCTION_OUTPUTS: P1.7(MOSI) serial output
  29           *                   P1.1
  30           */
  31          void main(void)
  32          {
  33   1      SPCON |= 0x82;                /* Fclk Periph/128 */
  34   1      SPCON |= 0x20;                /* P1.1 is available as standard I/O pin */
  35   1      /* SPCON.5(SSDIS) has no effect if CPHA=0 in slave mode then P1.1 is used to slave select */ 
  36   1      SPCON &= ~0x10;               /* slave mode */
  37   1      SPCON &= ~0x08;               /* CPOL=0; transmit mode example*/
  38   1      SPCON |= 0x04;                /* CPHA=1; transmit mode example*/
  39   1      IEN1 |= 0x04;                 /* enable spi interrupt */
  40   1      SPCON |= 0x40;                /* spi run */
  41   1      transmit_completed = 0;       /* clear software transfert flag */
  42   1      EA=1;                         /* enable interrupts */
  43   1      
  44   1      while(1)                      /* endless  */
  45   1      {
  46   2      P1_1=~P1_1;                   /* P1.1 is available as standard I/O pin */
  47   2      if(transmit_completed)
  48   2         {
  49   3         SPDAT = serial_data;       /* echo data to master */
  50   3         transmit_completed = 0;    /* clear software transfert flag */
  51   3         }
  52   2      }
  53   1      
  54   1      
  55   1      }
C51 COMPILER V7.10   SPI_SLAVE_NO_SS                                                       04/30/2004 14:21:11 PAGE 2   

  56          
  57          
  58          /**
  59           * FUNCTION_PURPOSE: spi interrupt, receive data to master
  60           * FUNCTION_INPUTS: void
  61           * FUNCTION_OUTPUTS: void
  62           */
  63          void it_SPI(void) interrupt 9 /* interrupt address is 0x004B */
  64          {
  65   1         switch   ( SPSTA )         /* read and clear spi status register */
  66   1         {
  67   2            case 0x80:
  68   2               serial_data=SPDAT;   /* read receive data */
  69   2               transmit_completed=1;/* set software flag */
  70   2            break;
  71   2      
  72   2            case 0x10:
  73   2               /* put here for mode fault tasking */  
  74   2            break;
  75   2         
  76   2            case 0x40:
  77   2               /* put here for overrun tasking */  
  78   2            break;
  79   2         }
  80   1         SPDAT=serial_data;         /* needed to complete clearing sequence */
  81   1      }
  82          
  83          
  84          


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =     68    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =   ----    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =      1    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =      1    ----
END OF MODULE INFORMATION.


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