main.c

Jtag调试驱动的例子程序

#include <windows.h>
#include <stdio.h>


#include "types.h"
#include "tool.h"
#include "jtag.h"
#include "xjerr.h"
#include "tapctrl.h"
#include "./arm7tdmi/arm7tdmi.h"

/* 
 * This array is a bin file of an executable program. The source code 
 * comes with this program. Please check the source code under directory
 * ADS Example.
 * The RO_BASE = 0x00200000
 */

u8 ads[100]=
{68,0,159,229,255,16,160,227,0,16,128,229,60,0,159,229,
126,16,160,227,125,32,160,227,123,48,160,227,119,64,160,227,
238,80,160,227,222,96,160,227,190,112,160,227,0,16,128,229,
0,32,128,229,0,48,128,229,0,64,128,229,0,80,128,229,
0,96,128,229,0,112,128,229,254,255,255,234,0,80,255,3,
8,80,255,3};


int main()
{
	int status;
	int i;
	u32 pc;

	//Init ...
	jtag_init();
	tapctrl_init();
	arm7tdmi_init();

/**************************TESTING****************************/
	
	/*
	 * Enter DEBUG state by force to download debug program
	 */
	status = arm7tdmi_enter_dbgstat(&pc);	
	if(status != XJ_OK)
		printf("Failed to enter DEBUG state\n");

	//Write the program to memory location 0x200000
	status = arm7tdmi_mem_wri32(0x200000, (u32*)ads, 25);	
	if(status != XJ_OK)
		printf("Failed to download program\n");	

	//Before start, set a breakpt @ 0x200000
	status = arm7tdmi_set_breakpt(0x200000);
	if(status != XJ_OK)
		printf("Failed to set breakpt\n");	

	//Exit from DEBUG state and and start the program at 0x200000
	status = arm7tdmi_exit_dbgstat(0x200000);
	if(status != XJ_OK)
		printf("Failed to resume the program\n");	


	//Single step debug...
	for(i = 0; i < 5; ){
		Sleep(500);

		//Enter DEBUG state?
		status = arm7tdmi_check_dbgstat(&pc);  

		if(status == XJ_OK){					//Enter DEBUG state by breakpt
			i++;
			arm7tdmi_clr_breakpt(pc);			//Clear the breakpt first
			if(i != 5)
				arm7tdmi_set_breakpt(pc + 4);	//Set a new breakpt 
			arm7tdmi_exit_dbgstat(pc);			//Resume the program
		}
	}

	return 0;
}