main.c

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/**************** (c) 1998  SGS-Thomson Microelectronics **********************
     
PROJECT  : ST72101
COMPILER : ST7 HICROSS C (HIWARE)

MODULE  :  main.c
VERSION :  V 2.0

CREATION DATE :  03/07/98

AUTHOR : PPG 8-bit Micro Application team 

-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

DESCRIPTION :   Main Routine
                Example of how to use the HIWARE tool chain 
              
-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-

MODIFICATIONS :

******************************************************************************/

// Include files
 
#include "hidef.h"      // Hiware library.
#include "map72101.h"   // ST72101 memory and registers mapping   
#include "lib_bits.h"   // Predifined libraries working at bit level
#include "variable.h"   // Define your global variables here
#include "init.h"       // ST72101 initialization routine for the application
#include "function.h"   // All functions used in the application can be defined
                        // here for a good project management.


//-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
                                                  
void    main(void)
{ 
char var;               // Example of how to declare local variables 
char i,j;               // All variables are defined as char or unsigned
char ram_array[10];     // char for a Byte coding.

    Init_Ports();       // Call to the Init_Ports subroutine declared in 
                        // init.h file.                                
    Gen_PWM();          // Call the routine which generates a PWM signal
                        // Subroutines declared in the function.c.
                        // The output signal can be visualized on PB1 pin.
    
while(1)                        // never ending loop. (<=> jra assembler instruction)
  {                     
    i=j=0;
    var= addition(data1,data2); // var will be the result of the addition's subroutine 
                                // declared in the function.h file                               
    data3 = var;                // store returned value in memory (ram).
    if (!ValBit(data3,ZERO))    // example of how to use the lib_bits library.
        {                       // One test bit 0 of data3 and branch according to
                                // the if condition
        ramloc3 = data2;
        PADR = ONE;
        }
    else
        {            
        ramloc2 = data2;               
        PADR = ZERO;
        }
    data1 = data1 + 1;          // increment data1 value
    while (i!=10)               // Example of a while instruction
        {
        ram_array[i] = table[i];// copy of a rom array declared in variable.h file
                                // into a ram array. A direct indexed addressing mode 
        i = i+1;                // is used.
        }            
  
    for (j=0;j<10;j++)          // you can also use the for condition. However, using
        {                       // ST7 decoder, you can see the assembler code generated
        ram_array[j] = table[j];// an compare the two instructions.                
        }                       // In this case, the code generated is more optimized
                                // for the while loop.

    asm                         // You can also insert assembler code in your C program.
        {
        nop                     // No instruction is performed but a machine cycle is lost.
        }                       // in the main program.

  } // while(1) loop                            

} // main loop

/*** (c) 1998  SGS-Thomson Microelectronics ****************** END OF FILE ***/