Display Driver Part 5

Outputting numeric values directly to the screen would be another tool that would be useful in debugging ADC input and also for the game.  The student would like to output a number including its leading zeros to the screen.  The student thinks it would be useful to output WORD and DWORD values to the screen.

The student coded the following two functions to output numeric values to the screen.

// begin example

void LCDPutDWORD(DWORD num, int x, int y, int fColor, int bColor)

{

//Size of a DWORD is as follows

//FFFFFFFF

//4294967295

// 10 places

const int sizeOFDWORD = 10;

char outString[sizeOFDWORD + 1];

outString[sizeOFDWORD] = '\0';

int loopCtr;

for (loopCtr = 0; loopCtr < sizeOFDWORD; loopCtr++)

{

// pull of the last digit and store it

char curDigit = num % 10;

// convert digit to it's ASCII value

curDigit = curDigit + 48; 

// store ASCII value into the string in the correct spot

outString[sizeOFDWORD - loopCtr - 1] = curDigit;

// prep number to pull of next digit. 

// (0/10 =0) is expected to happen multiple times

num = num / 10;

}

LCDPutStr(outString, x, y, fColor, bColor);

}

void LCDPutWORD(WORD num, int x, int y, int fColor, int bColor)

{

// Size of a WORD is as follows

// FFFF

// 65535

const int sizeOFWORD = 5;

char outString[sizeOFWORD + 1];

outString[sizeOFWORD] = 0x00;

int loopCtr;

for (loopCtr = 0; loopCtr < sizeOFWORD; loopCtr++)

{

// pull of the last digit and store it

char curDigit = num % 10;

// convert digit to it's ASCII value

curDigit = curDigit + 48; 

// store ASCII value into the string in the correct spot

outString[sizeOFWORD - loopCtr - 1] = curDigit;

// prep number to pull of next digit. 

// (0/10 =0) is expected to happen multiple times

num = num / 10;

}

LCDPutStr(outString, x, y, fColor, bColor);

}

// end example

The functions above allowed the student to output numeric values received as a result of an analog to digital conversion.