spi.lst

p89lpc915程序

C51 COMPILER V8.08   SPI                                                                   07/26/2007 15:52:32 PAGE 1   


C51 COMPILER V8.08, COMPILATION OF MODULE SPI
OBJECT MODULE PLACED IN .\obj\SPI.obj
COMPILER INVOKED BY: C:\Keil\C51\BIN\C51.EXE SRC\SPI.C BROWSE DEBUG OBJECTEXTEND PRINT(.\lst\SPI.lst) OBJECT(.\obj\SPI.o
                    -bj)

line level    source

   1          #ifdef PH_932
              
              
              #include <reg915.h>
              #include "spi.h"
              #include "message.h"
              
              // flag to indicate if SPI is currently involved in a transfer or not
              // stops a write to the SPI bus while a write is in progress
              #define INFORMATION_CNT 4
              #define DISC_TYPE_POSI  0
              #define INPUT_MODE_POSI 1
              #define SAMPLE_FREQ_POSI        2
              #define WORD_LENGTH_POSI        3
              
              static bit mspibusy;
              bit spi_valid = 0;
              char information[INFORMATION_CNT];
              char spi_cnt = 0;
              unsigned char spi_cmd = 0;
              /***********************************************************************
              DESC:    SPI Interrupt Service Routine
                       Called when byte transmitted and/or byte received
                       or if mode changed to slave by Slave Select pin
              RETURNS: Nothing
              ************************************************************************/
              void spi_isr () interrupt 9 using 3
              {
                // clear SPIF bit by writing 1 to it
                SPSTAT |= 0x80;
                spi_cmd = SPDAT;
              /*  spi_valid = 1;*/
              /*
                      while(RI == 1);
                      SBUF = SPDAT;
                      while(TI == 0);
                      TI = 0;
              */
                // SPI not busy
                mspibusy = 0;
              } // spi_isr
              
              /***********************************************************************
              DESC:    Initializes the SPI peripheral
                       SPI Clock frequency = 250 kHz
                       Set EA to 1 after calling
              RETURNS: Nothing
              ************************************************************************/
              void spi_init()
              {
                // set MOSI, MISO, /SS and SPICLK as quasi-bidirectional
                P2M1 &= 0xC3;
                P2M2 &= 0xC3;
              
C51 COMPILER V8.08   SPI                                                                   07/26/2007 15:52:32 PAGE 2   

                // configure SPI
                SPCTL = 0x4C;
              
                // SPI initially not busy
                mspibusy = 0;
              
                // set SPI interrupt priority to 0
                IP1 &= ~0x08;
                IP1H &= ~0x08;
              
                // enable SPI interrupt
                ESPI = 1;
              } // spi_init
              
              
              #endif


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =   ----    ----
   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)