The DigitTo7SegEncoder() Function
The following function DigitTo7SegEncoder() takes a decimal digit and returns an encoded value used to display the digit on a Seven Segment Display. Please see the comments at the top of the function for a more detail explanation.
/*
* Author: AVR Tutorials
* AVR-Tutorials.com
*
* Compiler: AVR GNU C Compiler (GCC)
*
* Function Description:
* Encode a Decimal Digit 0-9 to its Seven Segment Equivalent.
*
* Function Arguments:
* digit - Decimal Digit to be Encoded
* common - Common Anode (0), Common Cathode(1)
* SegVal - Encoded Seven Segment Value
*
* Connections:
* Encoded SegVal is return in the other G-F-E-D-C-B-A that is A is the least
* significant bit (bit 0) and G bit 6.
*/
unsigned char DigitTo7SegEncoder(unsigned char digit, unsigned char common)
{
unsigned char SegVal;
switch(digit)
{
case 0: if(common == 1) SegVal = 0b00111111;
else SegVal = ~0b00111111;
break;
case 1: if(common == 1) SegVal = 0b00000110;
else SegVal = ~0b00000110;
break;
case 2: if(common == 1) SegVal = 0b01011011;
else SegVal = ~0b01011011;
break;
case 3: if(common == 1) SegVal = 0b01001111;
else SegVal = ~0b01001111;
break;
case 4: if(common == 1) SegVal = 0b01100110;
else SegVal = ~0b01100110;
break;
case 5: if(common == 1) SegVal = 0b01101101;
else SegVal = ~0b01101101;
break;
case 6: if(common == 1) SegVal = 0b01111101;
else SegVal = ~0b01111101;
break;
case 7: if(common == 1) SegVal = 0b00000111;
else SegVal = ~0b00000111;
break;
case 8: if(common == 1) SegVal = 0b01111111;
else SegVal = ~0b01111111;
break;
case 9: if(common == 1) SegVal = 0b01101111;
else SegVal = ~0b01101111;
}
return SegVal;
}