peripheral_test_memory.c

一款基于FPGA的对于VGA实现全彩控制的程序

#include "peripheral_test.h"
#include "excalibur.h"

// Prototypes

int test(char *memLow, char *memHigh, int start);

// Meat

#define wrap 1025	// doesn't divide into power of 2, so address lines get flexed.

void DoMemoryTest(void)
	{
	char *memLow;
	char *memHigh;
	int start;
	int result;

	memLow = (char *)(sbrk(0) + 1000);
	memHigh = ((char *)&start) - 1000;

	printf("-----------------------------\n");
	printf("Testing memory 0x%x - 0x%x\n",memLow,memHigh);
	printf("-----------------------------\n");

	for(start = 0; start < 256; start++)
		{
		if(rGetChar() == 27)
			{
			printf("Memory test aborted.\n");
			return;
			}

		nr_pio_showhex(start);

		printf("test %3d of 256... ",start);
		result = test(memLow,memHigh,start);
		printf("%s\n",result ? "passed" : "failed");
		}
	
	printf("Memory test done.\n");
	}

int test(char *memLow, char *memHigh, int start)
	{
	int x;

	char *memP;


	// fill

	x = start;
	for(memP = memLow; memP < memHigh; memP++)
		{
		*memP = (char) x;
		x ++;
		if(x >= wrap)
			x = 0;
		}

	// test

	x = start;
	for(memP = memLow; memP < memHigh; memP++)
		{
		if(*memP != (char) x)
			return 0;		// fail
		
		x ++;
		if(x >= wrap)
			x = 0;
		}
	
	// pass

	return 1;
	}