29,11 → 29,13 |
#include <key_buffer.h> |
#include <fifo.h> |
|
#define KBD_BUFFER_SIZE 128 |
#define KBD_BUFFER_SIZE 128 /**< Size of buffer for pressed keys */ |
|
FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); |
fifo_count_t buffer_items; |
FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); /**< Fifo for storing pressed keys */ |
fifo_count_t buffer_items; /**< Counter of used items for prevent fifo overflow */ |
|
/** Clear key buffer. |
*/ |
void key_buffer_free(void) |
{ |
buffer_items = 0; |
40,12 → 42,17 |
buffer.head = buffer.tail = 0; |
} |
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/** Key buffer initialization. |
* |
*/ |
void key_buffer_init(void) |
{ |
key_buffer_free(); |
} |
|
/** |
/** Get free space in buffer. |
* This function is useful for processing some scancodes that are translated |
* to more than one character. |
* @return empty buffer space |
*/ |
int key_buffer_available(void) |
53,9 → 60,20 |
return KBD_BUFFER_SIZE - buffer_items; |
} |
|
/** |
* @return nonzero, if buffer is not empty. |
*/ |
int key_buffer_empty(void) |
{ |
return (buffer_items == 0); |
} |
|
/** Push key to key buffer. |
* If buffer is full, character is ignored. |
* @param key code of stored key |
*/ |
void key_buffer_push(char key) |
{ |
/* TODO: somebody may wait for key */ |
if (buffer_items < KBD_BUFFER_SIZE) { |
fifo_push(buffer, key); |
buffer_items++; |
63,7 → 81,7 |
} |
|
/** Pop character from buffer. |
* @param c |
* @param c pointer to space where to store character from buffer. |
* @return zero on empty buffer, nonzero else |
*/ |
int key_buffer_pop(char *c) |