spi.lst

This is example of using Atmel at89c5131 MCU with at49db11(spi dataflash) and epson s1d1335 graphic

C51 COMPILER V8.00   SPI                                                                   04/09/2009 08:55:38 PAGE 1   


C51 COMPILER V8.00, COMPILATION OF MODULE SPI
OBJECT MODULE PLACED IN spi.OBJ
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE spi.c LARGE BROWSE DEBUG OBJECTEXTEND

line level    source

   1          #include "spi.h"
   2          #include <Atmel/at89c5131.h>
   3          
   4          
   5          
   6          unsigned char serial_data;
   7          bit transmit_completed = 0;
   8          bit overrun = 0;
   9          bit fault_tasking = 0;
  10          char SpiErrorCode = 0;
  11          /**
  12           * FUNCTION_PURPOSE: This file set up spi in master mode with
  13           * Fclk Periph/128 as baud rate  and without slave select pin
  14           * FUNCTION_INPUTS: P1.5(MISO) serial input
  15           * FUNCTION_OUTPUTS: P1.7(MOSI) serial output
  16           *                   P1.1
  17           */
  18          //----------------------------------------------------------------------------
  19          void InitSpi()
  20          {
  21   1              //CS_SPI = 1;
  22   1              EA = 0;
  23   1              SPCON |= 0x10;                /* Master mode */
  24   1              SPCON |= 0x80;                /* Fclk Periph/128 */
  25   1              SPCON |= 0x20;                /* P1.1 is available as standard I/O pin */
  26   1              SPCON |= 0x08;               /* CPOL=0; transmit mode example */
  27   1              SPCON |= 0x04;                /* CPHA=0; transmit mode example */
  28   1              IEN1 |= 0x04;                 /* enable spi interrupt */
  29   1              SPCON |= 0x40;                /* run spi */
  30   1              EA = 1;                                                 /* enable interrupts */
  31   1      }
  32          
  33          
  34          //----------------------------------------------------------------------------
  35          void it_SPI(void) interrupt 9 /* interrupt address is 0x004B */
  36          {
  37   1              switch(SPSTA)         /* read and clear spi status register */
  38   1              {
  39   2                      case 0x80:
  40   2                      serial_data = SPDAT;   /* read receive data */
  41   2                              SpiErrorCode = 0;
  42   2                      transmit_completed = 1;/* set software flag */
  43   2                              break;
  44   2      
  45   2                      case 0x10:
  46   2                      /* put here for mode fault tasking */
  47   2                              SpiErrorCode = SPI_ERROR_MODF;
  48   2                              transmit_completed = 1;
  49   2                              break;
  50   2      
  51   2                      case 0x40:
  52   2                      /* put here for overrun tasking */
  53   2                              SpiErrorCode = SPI_ERROR_OVERRUN;
  54   2                              transmit_completed = 1;
  55   2                              break;
C51 COMPILER V8.00   SPI                                                                   04/09/2009 08:55:38 PAGE 2   

  56   2              }
  57   1      }
  58          //----------------------------------------------------------------------------
  59          
  60          /*******************************************************
  61          *       玎镨覃忄弪 徉轵 潆