7SEG (Seven Segment Display)

Files
file	7seg.h
	Controls the two 7-segment displays on the board.
Functions
int8_t	sb_7seg_showNumber (int8_t nmbr)
	prints a number in the range [-9; 99] on the 7-segment display
int8_t	sb_7seg_showHexNumber (uint8_t nmbr)
	prints the hexadecimal representation of an 8-bit unsigned integer on the 7-segment display
int8_t	sb_7seg_showStr (char *str)
	prints a 2 character string on the 7-segment display
void	sb_7seg_disable (void)
	disables the 7-segment displays

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Function Documentation

void sb_7seg_disable

(

void

)

disables the 7-segment displays

Any running alarms are unregistered.

int8_t sb_7seg_showHexNumber

(

uint8_t

nmbr

)

prints the hexadecimal representation of an 8-bit unsigned integer on the 7-segment display

Parameters:

nmbr

the number to print

Returns:

0 on success

!0 on error

int8_t sb_7seg_showNumber

(

int8_t

nmbr

)

prints a number in the range [-9; 99] on the 7-segment display

Parameters:

nmbr

the number to print

Returns:

0 on success, negative value on error

Return values:

	0	success
	-1	nmbr is smaller than -9
	-2	nmbr is greater than 99

int8_t sb_7seg_showStr

(

char *

str

)

prints a 2 character string on the 7-segment display

Supported characters are in the group [-_ 0-9ACE-JLPRUXb-dhnoru] (contains space). Read this article for possible representations of these characters. Two characters of the set should never have the same representation.

Parameters:

str

the 0-terminated string

Returns:

0 on success, negative value on error

Return values:

	0	success
	-1	character at position 0 not printable
	-2	character at position 1 not printable
	-3	both characters not printable
	-4	str is an empty string