Code Change ASM to C Code

michaellee — Mon, 13 Jun 2016 01:00:36 GMT

Dear All

Below I want to change the ASM to C code.

Core is S12P.

Asm ANDCC # 0x7Fu;  // Logical AND with CCR

Asm JSR Send_Command;  Jump to Subroutine Send_Command Function

Asm SEI;  Set interrupt bit

Asm CLI  Clear Interrupt bit

Asm STOP  STOP

Thank BR

Re: Cord Change ASM to C Cord

RadekS — Mon, 13 Jun 2016 08:50:30 GMT

Hi Michael,

The asm CLI; and asm SEI; commands are defined in hidef.h file as EnableInterrupts; and DisableInterrupts; commands.

The same format might be used for other commands. For example:

#define ClearSbit {__asm ANDCC # 0x7Fu;}

#define StopMode {__asm STOP;}

The code for flash command with wait loop in RAM might be defined as an array of opcodes. For example:

static byte Send_Command[]=
{
  0x14, 0x10, 0x1C, 0x01, 0x06, 0x80, 0x1F, 0x01, 0x06, 0x80, 0xFB, 0x10, 0xEF, 0x3D
};

And the command for execution will be

asm JSR Send_Command;

or you may directly write C code and let linker to place it into RAM. For example:

#pragma CODE_SEG __NEAR_SEG MY_RAM
void Send_Command2(void)
{
DisableInterrupts;      //start critical section
  FSTAT_CCIF = 1;        //launch command
  while(FSTAT_CCIF == 0); //wait for done
EnableInterrupts;      //end critical section
}
#pragma CODE_SEG DEFAULT

And the command for execution will be

Send_Command2();

Note: In CW5.1, the MY_RAM must be a user segment defined in prm file. Placing this code into DEFAULT_RAM doesn’t work. For example:

SEGMENTS

//..

RAM_ROUTINE = READ_WRITE 0x3FF0 TO 0x3FFF; //space for flash routine

//..

END

PLACEMENT

//..

MY_RAM INTO RAM_ROUTINE;

//..

END

I hope it helps you.

Have a great day,
Radek

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