odds_and_ends.c File Reference

#include "odds_and_ends.h"

Functions
uint8_t	asciitovalue (uint8_t ascii)
	Convert an ASCII character to its numeric equivalent.
uint8_t	hex2ascii_h (uint8_t hexval)
	Convert the top nibble of a btye to ASCII.
uint8_t	hex2ascii_l (uint8_t hexval)
	Convert the bottom nibble of a btye to ASCII.
uint8_t	bcd_to_hex (uint8_t bcd)
	Convert a BCD value in a byte to the correct hex value.
uint8_t	get_bcd_switch_setting (void)
	return a value derived from a BCD switch

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Function Documentation

uint8_t asciitovalue

(

uint8_t

ascii

)

Convert an ASCII character to its numeric equivalent.

Parameters:

ascii

ASCII character to convert

Returns:

uint8_t Converted value

uint8_t bcd_to_hex

(

uint8_t

bcd

)

Convert a BCD value in a byte to the correct hex value.

Parameters:

bcd

uint8_t value in BCD

Returns:

returns uint8_t hex value converted from BCD

For example, 23 -> 0x17

uint8_t get_bcd_switch_setting

(

void

)

return a value derived from a BCD switch

Returns:

uint8_t Top bit set if there has been a change since function last called Bottom (usually 4) bits represent the number on the switch dial. eg dial=6, and this is a change from previous value, return value is 0x86

requires the BCD switch to be on 4 consecutive bits of a single port Needs definitions of BCD_PIN The PIN the switch is on, eg PINB BCD_SHIFT The number of bit positions to shift right to get the value bottom aligned BCD_MASK The mask required to select the switch bits once shifted, nearly always 0x0F

uint8_t hex2ascii_h

(

uint8_t

hexval

)

Convert the top nibble of a btye to ASCII.

Parameters:

hexval

8 bit value whose top 4 bits are to be converted to ASCII

Returns:

uint8_t Converted value

uint8_t hex2ascii_l

(

uint8_t

hexval

)

Convert the bottom nibble of a btye to ASCII.

Parameters:

hexval

8 bit value whose bottom 4 bits are to be converted to ASCII

Returns:

uint8_t Converted value