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| 27 | */ |
27 | */ |
| 28 | 28 | ||
| 29 | #include <key_buffer.h> |
29 | #include <key_buffer.h> |
| 30 | #include <fifo.h> |
30 | #include <fifo.h> |
| 31 | 31 | ||
| 32 | #define KBD_BUFFER_SIZE 128 |
32 | #define KBD_BUFFER_SIZE 128 /**< Size of buffer for pressed keys */ |
| 33 | 33 | ||
| 34 | FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); |
34 | FIFO_INITIALIZE_STATIC(buffer, char, KBD_BUFFER_SIZE); /**< Fifo for storing pressed keys */ |
| 35 | fifo_count_t buffer_items; |
35 | fifo_count_t buffer_items; /**< Counter of used items for prevent fifo overflow */ |
| 36 | 36 | ||
| - | 37 | /** Clear key buffer. |
|
| - | 38 | */ |
|
| 37 | void key_buffer_free(void) |
39 | void key_buffer_free(void) |
| 38 | { |
40 | { |
| 39 | buffer_items = 0; |
41 | buffer_items = 0; |
| 40 | buffer.head = buffer.tail = 0; |
42 | buffer.head = buffer.tail = 0; |
| 41 | } |
43 | } |
| 42 | 44 | ||
| - | 45 | /** Key buffer initialization. |
|
| - | 46 | * |
|
| - | 47 | */ |
|
| 43 | void key_buffer_init(void) |
48 | void key_buffer_init(void) |
| 44 | { |
49 | { |
| 45 | key_buffer_free(); |
50 | key_buffer_free(); |
| 46 | } |
51 | } |
| 47 | 52 | ||
| 48 | /** |
53 | /** Get free space in buffer. |
| - | 54 | * This function is useful for processing some scancodes that are translated |
|
| - | 55 | * to more than one character. |
|
| 49 | * @return empty buffer space |
56 | * @return empty buffer space |
| 50 | */ |
57 | */ |
| 51 | int key_buffer_available(void) |
58 | int key_buffer_available(void) |
| 52 | { |
59 | { |
| 53 | return KBD_BUFFER_SIZE - buffer_items; |
60 | return KBD_BUFFER_SIZE - buffer_items; |
| 54 | } |
61 | } |
| 55 | 62 | ||
| - | 63 | /** |
|
| - | 64 | * @return nonzero, if buffer is not empty. |
|
| - | 65 | */ |
|
| - | 66 | int key_buffer_empty(void) |
|
| - | 67 | { |
|
| - | 68 | return (buffer_items == 0); |
|
| - | 69 | } |
|
| - | 70 | ||
| - | 71 | /** Push key to key buffer. |
|
| - | 72 | * If buffer is full, character is ignored. |
|
| - | 73 | * @param key code of stored key |
|
| - | 74 | */ |
|
| 56 | void key_buffer_push(char key) |
75 | void key_buffer_push(char key) |
| 57 | { |
76 | { |
| 58 | /* TODO: somebody may wait for key */ |
- | |
| 59 | if (buffer_items < KBD_BUFFER_SIZE) { |
77 | if (buffer_items < KBD_BUFFER_SIZE) { |
| 60 | fifo_push(buffer, key); |
78 | fifo_push(buffer, key); |
| 61 | buffer_items++; |
79 | buffer_items++; |
| 62 | } |
80 | } |
| 63 | } |
81 | } |
| 64 | 82 | ||
| 65 | /** Pop character from buffer. |
83 | /** Pop character from buffer. |
| 66 | * @param c |
84 | * @param c pointer to space where to store character from buffer. |
| 67 | * @return zero on empty buffer, nonzero else |
85 | * @return zero on empty buffer, nonzero else |
| 68 | */ |
86 | */ |
| 69 | int key_buffer_pop(char *c) |
87 | int key_buffer_pop(char *c) |
| 70 | { |
88 | { |
| 71 | if (buffer_items > 0) { |
89 | if (buffer_items > 0) { |