ascii conversion code samples

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userx51

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hi,
I am very new to C and inside MCU, I need to convert from bin2ascii and ascii2bin in order to read and write to hyperterminal?. any sample codes in C?.:?:
 

2^0*i[0]+ 2^1*i[1]+ 2^2*i[2]+ and so on........
 

I am sorry, how do i convert 2F to ascii. and how to convert it back to bin in C language. sorry for my lack of familiarity. just started reading about it. within the MCU. I work with hyper terminal. experimenting motor motion.
 

as give example if u want to send 2F then senf lsb nibble by using masking of 0x0f and again shift msb nibble to lsb side again do same.

example:

unsigned char ascii_array[16]={"0123456789ABCDEF"};
void send_ascii(unsigned char dat)
{
unsigned char temp;
temp = dat & 0x0F;
tx(ascii_array[temp]);

temp = dat >> 4;
temp = temp & 0x0f;
tx(ascii_array[temp]);
}

- - - Updated - - -

and if u want to convert it to in bin form then

if(num <9 && num >0)
num = num-'0';

if num is A to F then minus 'A'

and then again combine it in reverse manner
 

If you just want single character/digit conversions, these should work:

Code: 
//*******************************************************************************
//
char AscToBin(char AsciiChar)
{
	if(AsciiChar > '9') AsciiChar -= 7;
	return((AsciiChar - '0') & 0x0F);
}

//*******************************************************************************
//
char BinToAsc(char BinValue)
{
	BinValue &= 0x0F;
	if(BinValue > 9) BinValue += 7;
	return(BinValue + '0');
}

Call the appropriate one with the character/digit as the parameter and it will return the converted version, for example:

AsciiCharacter = BinToAsc(5); Will return the Ascii character '5' (0x35)

BinaryValue = AscToBin('A'); will return 0x0A

Brian.
 

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