Brute Force Techniques I

Code

#include <LPC17xx.h>
#define ALLDISP 0x00180000                    // Selecting all displays
#define DATAPORT 0x00000FF0                   // Data lines connected to drive the segments

unsigned int i, delay, count = 0, switchCount = 0;
unsigned int display[16] = {
		0x000003F0, 0x00000060, 0x000005B0, 0x000004F0,
		0x00000660, 0x000006D0, 0x000007D0, 0x00000070,
		0x000007F0, 0x000006F0, 0x00000770, 0x000007C0,
		0x00000390, 0x000005E0, 0x00000790, 0x00000710
};

int main(void) {
	LPC_PINCON->PINSEL0 = 0x00000000;
	LPC_PINCON->PINSEL1 = 0x00000000;
	LPC_GPIO0->FIODIR =	0x00180FF0;

	while(1)
	{
		LPC_GPIO0->FIOSET |= ALLDISP;
		LPC_GPIO0->FIOCLR =	0x00000FF0;               // Clear data lines to displays
		LPC_GPIO0->FIOSET = display[switchCount];     // Get the 7-segment display value from array

		for(i = 0; i < 3; i++)
			for(delay = 0; delay < 3000000; delay++);
				switchCount++;

		if(switchCount == 0x10)                       // If 0 to F has been displayed, reset to 0
		{
			switchCount = 0;
			LPC_GPIO0->FIOCLR = 0x00180FF0;
		}
	}
}

To create a reverse version,

#include <LPC17xx.h>
#define ALLDISP 0x00180000                    // Selecting all displays
#define DATAPORT 0x00000FF0                   // Data lines connected to drive the segments

unsigned int i, delay, count = 0, switchCount = 16;
unsigned int display[16] = {
		0x000003F0, 0x00000060, 0x000005B0, 0x000004F0,
		0x00000660, 0x000006D0, 0x000007D0, 0x00000070,
		0x000007F0, 0x000006F0, 0x00000770, 0x000007C0,
		0x00000390, 0x000005E0, 0x00000790, 0x00000710
};

int main(void) {
	LPC_PINCON->PINSEL0 = 0x00000000;
	LPC_PINCON->PINSEL1 = 0x00000000;
	LPC_GPIO0->FIODIR =	0x00180FF0;

	while(1)
	{
		LPC_GPIO0->FIOSET |= ALLDISP;
		LPC_GPIO0->FIOCLR =	0x00000FF0;               // Clear data lines to displays
		LPC_GPIO0->FIOSET = display[switchCount - 1];     // Get the 7-segment display value from array

		for(i = 0; i < 3; i++)
			for(delay = 0; delay < 3000000; delay++);
				switchCount--;

		if(switchCount == 0)                       // If 0 to F has been displayed, reset to 0
		{
			switchCount = 16;
			LPC_GPIO0->FIOCLR = 0x00180FF0;
		}
	}
}

Circuit Photograph