Inline Assembly & Interrupt Functions

"1) I want to place assembly code in my C code. The problem with using SRC is that I would have to rename the file MyAsm.SRC to MyAsm.A51 and then (remove C code from project) include A51 code in the project... before finally recompiling the whole project. Is there any way to just add assembly code without using SRC?"

No you don't!
You need to re-read the manual and follow the instructions carefully:
You just need to check the 'Generate Assembler SRC' and 'Assemble SRC' options - that's all!

"How do I disable this feature so I can manually do the PUSHing and POPing?"

You shouldn't be doing that sort of thing in 'C'!
If this is really what you need to do, then this a job for assembler, not 'C'.

Hi Ken,

that SRC thing is just a help for you to build the structure of a function. You just do it once, just typing in the function with its parameters and return value, use the parameters in the function in a simple (dummy) way, then you get assembly code, that declares the segments etc. and shows you where you will find your parameters. This is done once. You "steal" that assembly code mand do all the programming in assembler, never use the SRC pragma again.

For example, if you want to write an assembly module that handles an LCD display, you first set up a "Prototyping C-source" lcd_prot.c that looks like this:

#pragma SRC

bit lcd_busy( void ) {
  return 1;
}

void lcd_out( unsigned char out_byte, unsigned char ram ) {
  if (ram) {
    out_byte++;
  }
}

void lcd_outchar( unsigned char out_byte ) {
  out_byte++;
}

void lcd_outinstr( unsigned char out_byte ) {
  out_byte++;
} 
 
void lcd_clear( void ) {
  unsigned char byte;
  
  byte++;
}

void lcd_init( void ) {
  unsigned char byte;
  
  byte++;
}

; c:\c51\proj\Test\lcd.SRC generated from: c:\c51\proj\Test\lcd.c


NAME	LCD

?PR?lcd_busy?LCD     SEGMENT CODE 
?PR?_lcd_out?LCD     SEGMENT CODE 
?PR?_lcd_outchar?LCD SEGMENT CODE 
?PR?_lcd_outinstr?LCD                    SEGMENT CODE 
?PR?lcd_clear?LCD    SEGMENT CODE 
?XD?lcd_clear?LCD    SEGMENT XDATA OVERLAYABLE 
?PR?lcd_init?LCD     SEGMENT CODE 
?XD?lcd_init?LCD     SEGMENT XDATA OVERLAYABLE 
?PR?_lcd_gotoxy?LCD  SEGMENT CODE 
?PR?lcd_clreol?LCD   SEGMENT CODE 
?XD?lcd_clreol?LCD   SEGMENT XDATA OVERLAYABLE 
	PUBLIC	lcd_clreol
	PUBLIC	_lcd_gotoxy
	PUBLIC	lcd_init
	PUBLIC	lcd_clear
	PUBLIC	_lcd_outinstr
	PUBLIC	_lcd_outchar
	PUBLIC	_lcd_out
	PUBLIC	lcd_busy

	RSEG  ?XD?lcd_clreol?LCD
       byte?545:   DS   1
; #pragma SRC
; #pragma LARGE
; 
; bit lcd_busy( void ) {

	RSEG  ?PR?lcd_busy?LCD
lcd_busy:
			; SOURCE LINE # 4
;   return 1;
			; SOURCE LINE # 5
	SETB 	C
; }
			; SOURCE LINE # 6
?C0001:
	RET  	
; END OF lcd_busy
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