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6.6.3.3 Keypad
The functions used to control the keypad are contained in the RNET_KEYIF.LIB library
located in the Dynamic C RABBITNET library directory. This library supports keypads
with up to 64 keys.
int rn_keyInit(int handle, unsigned int iobits,
int buzzerperiod);
Initializes keypad and buzzer control for when a key is pressed. Call this function prior to any keypad
operations. Calling this function more than once will reinitialize key-processing queues.
To ensure keypad driver compatibility, the keypad must be installed so that a strobe line or data line
starts on J6 pin 1.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to estab-
lish the handle.
iobits is a 16-bit number that consists of 1’s for outputs and 0’s for inputs. Each bit represents one of
the 16 lines available for a keypad interface. For example, a value of 0x1F00 (= 0001111100000000)
assigns strobe lines to 13, 12, 11, 10, and 9 on header J6 of the Keypad/Display interface to serve as the
output strobe lines. The other bit lines are either inputs or are unused.
buzzerperiod indicates how long the buzzer remains activated whenever a key is pressed.
0 = buzzer does not sound when a key is pressed
1–255 ms = enable the buzzer for the specified period for each keypress detected (a value of 10 pro-
duces a short click)
RETURN VALUE
-1 means that device information indicates the Keypad/Display interface is not connected to the master.
void rn_keyConfig(int handle, char cRaw,
char cPress, char cRelease, char cCntHold,
char cSpdLo, char cCntLo, char cSpdHi);
Assigns each key with key press and release codes, and hold and repeat ticks for auto repeat and
debouncing.
To ensure keypad driver compatibility, the keypad must be installed so that a strobe line or data line
starts on J6 pin 1.
PARAMETERS
handle is an address index to device information. Use rn_device() or rn_find() to estab-
lish the handle.
cRaw is a raw key code index, 0–63 for 1–64 keys. Because keypad configurations will differ, assign the
raw code indexes according to your keypad configuration. For example:
2 × 6 keypad matrix with raw key code index assignments [in brackets]
[ 13 ] [ 12 ] [ 11 ] [ 10 ] [ 9 ] [ 8 ]
[ 5] [ 4] [ 3] [ 2][ 1][ 0]
132
RabbitNet Peripheral Cards
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