ram_test.c

此文档为采用FPGA实现的以太网MAC层

#include "excalibur.h"
#include "sys.h"



void ram_loop()
{
	Uint8 *charptr;
	Uint32 y;

	while (1)
	{
		for (y=0,charptr = na_sram;y<na_sram_size;y++)
		{
			*charptr = 0;
			*charptr = 0xFF;
			*charptr = 0x0;
			*charptr = 0x55;
			*charptr = 0x0;
			*charptr++ = 0xAA;
		}
		
		
		//printf("Checking bytes\n");
		
		
		for (charptr=na_sram,y=0;y<na_sram_size;y++)
		{
			na_led_port->np_piodata = y >> 12;
			if (*charptr != 0xAA)
			{
				printf("Error found (stress): Read back %X, should be 0xAA at offset %X\n",*charptr,y);
				return;
			}

			*charptr++;
			//*charptr++ = 0;
			
		}
		
	}
}

void ram_test()
{
	volatile Uint8 *charptr;
	volatile Uint16 *intptr;
	volatile Uint32 *longptr;
	volatile Uint32 x;
	volatile Uint32 y;

	
	volatile Uint8 data[257];

	printf("Code is executing from %X\n",nasys_program_mem);

	/* Execute ram test only if executing from onchip ram */
	if ((Uint32) nasys_program_mem == na_onchip_ram_base)
	
	{
		printf("Executing from onchip ram, starting ram test\n");
	}
	else
	{
		printf("Executing from SRAM, no ram test required\n");
		return;
	}

	/***************** START RAM TESTING **********************/
	
	//Fill up data array
	
	printf("Filling up 257 byte data array with 0x55 0xAA 0xFF\n");


	for (x=0;x<257;x++)
	{
		if (x == 0) data[x]=0x55;
		
		else if (data[x-1] == 0x55) data[x]=0xAA;
		
		else if (data[x-1] == 0xAA) data[x]=0xFF;
	}
	
	

	
	
	printf("Byte-wide, single-write RAM test\n");
	
	//Writing bytes
	
	printf("Writing bytes to RAM\n");
	
	charptr = na_sram;
	
	for (x=0,y=0;y<na_sram_size;y++)
	{
		*charptr++ = data[x++];
		if (x==257) x=0;
	}
	
	printf("Checking bytes\n");
	
	charptr = na_sram;
	for (x=0,y=0;y<na_sram_size;y++,x++)
	{
		if (x==257) x=0;
		
		if (data[x] != *charptr)
		{
			printf("Error found (byte): Read back %X, should be %X at offset %X\n",*charptr,data[x],y);
			//return 0;
		}
		
		*charptr++;
		
	}
	
	
	//////////////////////////////////////////////
	
	printf("Filling up 257 byte data array with 0xFF 0x55 0xAA\n");
	
	for (x=0;x<257;x++)
	{
		if (x == 0) data[x]=0xFF;
		
		else if (data[x-1] == 0xFF) data[x]=0x55;
		
		else if (data[x-1] == 0xAA) data[x]=0xAA;
	}
	
	
	
	printf("Int-wide, single-write RAM test\n");
	
	printf("Writing bytes to RAM\n");
	
	intptr = na_sram;
	
	for (x=0,y=0;y<na_sram_size;y+=2)
	{
		*intptr++ = (Uint16) data[x++];
		if (x>=257) x=0;
	}
	
	printf("Checking bytes\n");
	
	intptr = na_sram;
	for (x=0,y=0;y<na_sram_size;y+=2,x++)
	{
		if (x>=257) x=0;
		
		if ((Uint16) data[x] != *intptr)
		{
			printf("Error found (int): Read back %X, should be %X at offset %X\n",*intptr,(short int) data[x],y);
			exit(0);
			return;
		}
		
		*intptr++;
		
	}
	
	
	///////////////////////////////////////////////
	
	printf("Filling up 257 byte data array with 0xAA 0xFF 0x55\n");
	
	for (x=0;x<257;x++)
	{
		if (x == 0) data[x]=0xAA;
		
		else if (data[x-1] == 0xAA) data[x]=0xFF;
		
		else if (data[x-1] == 0xFF) data[x]=0x55;
	}
	
	
	
	printf("Long-wide, single-write RAM test\n");
	
	printf("Writing bytes to RAM\n");
	
	longptr = na_sram;
	
	for (x=0,y=0;y<na_sram_size;y+=4)
	{
		*longptr++ = (Uint32) data[x++];
		if (x>=257) x=0;
	}
	
	printf("Checking bytes\n");
	
	longptr = na_sram;
	for (x=0,y=0;y<na_sram_size;y+=4,x++)
	{
		if (x>=257) x=0;
		
		if ((Uint32) data[x] != *longptr)
		{
			printf("Error found (long): Read back %X, should be %X at offset %X\n",*longptr,(unsigned long) data[x],y);
			exit(1);
		}
		
		*longptr++;
		
	}
	
	/////////////////////////////////////////////////////
	
	
	printf("Performing shorted address-line check\n");
	
	
	
	printf("Clearing ram\n");
	for (y=0,charptr = na_sram;y<na_sram_size;y++)
	{
		*charptr++ = 0;
	}
	
	printf("Writing values and checking if cleared first\n");
	for (y=0,charptr = na_sram;y<na_sram_size;y++)
	{
		if (*charptr != 0)
		{
			printf("Error found (shorted): Read back %X, should be 0 at offset %X\n",*charptr,y);
		}
		*charptr++ = 0xFF;
	}
	

}


int main()
{
	
	
	ram_test();

	/* Go to continuous loop */
	printf("Running continuous ram test\n");

	ram_loop();
	
	return 0;
	
	
} /* end main */