flash.c

ADuC7020/26是ADI模拟公司开发的ARM7TDMI内核

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

 Author        : ADI - Apps            www.analog.com/MicroConverter

 Date          : Sept. 2005

 File          : Flash.c , RAM.c

 Hardware      : Applicable to ADuC702x rev H or I silicon
                 Currently targetting ADuC7026.

 Description   : This example demonstrate how to place functions in RAM.
 				 The UART is configured, the current PC location printed
				 to a termainl ( 9600-8-N-1 ), the program then jumps to
				 the RAM function and prints the current PC location to
				 the termainl. The example includes a function that has 
				 code written in assembly that allows us access the 
				 Program Counter

 Note			: The files syscalls.c and serial.c are required.
		
*********************************************************************/


#include <ADuC7026.h>
#include<stdio.h>

//	Function Prototypes
extern void Ram_Function(void);
int getPC (void);


int main(void)
{
	register unsigned int PC;

	GP1CON = 0x011;			// Setup tx & rx pins on P1.0 and P1.1

   	// Set UART to 9600bps 8-N-1 (CD=0)
	COMCON0 = 0x80;			// Setting DLAB
	COMDIV0 = 0x88;			
   	COMDIV1 = 0x00;
   	COMCON0 = 0x07;			// Clearing DLAB
	

	//Print current program counter address ... currently executing from FLASH!!
	printf("This is the main Flash Function.\n");
	PC = getPC();		// Getting current locatin of Program Counter  (Register R15)
	printf("The Current location of the Program Counter is : 0x%08X\n",PC);
    
	Ram_Function();

	return 0;
}



int getPC (void) {		 // Function to return the current location of the Program Counter
  						 
  int RetVal;
  __asm {				  // __asm attribute defines code as assembly code
     MOV     R0,LR              
     STAV    R0,R1,RetVal
  }
  return (RetVal);
}