4.104.114.84.95
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1 | /** |
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2 | * @file rtems/ringbuf.h |
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3 | * |
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4 | * This file provides simple ring buffer functionality. |
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5 | */ |
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6 | |
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7 | /* |
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8 | * $Id$ |
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9 | */ |
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10 | |
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11 | #ifndef _RTEMS_RINGBUF_H |
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12 | #define _RTEMS_RINGBUF_H |
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13 | |
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14 | #ifndef RINGBUF_QUEUE_LENGTH |
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15 | #define RINGBUF_QUEUE_LENGTH 128 |
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16 | #endif |
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17 | |
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18 | typedef struct { |
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19 | char buffer[RINGBUF_QUEUE_LENGTH]; |
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20 | volatile int head; |
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21 | volatile int tail; |
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22 | } Ring_buffer_t; |
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23 | |
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24 | #define Ring_buffer_Initialize( _buffer ) \ |
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25 | do { \ |
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26 | (_buffer)->head = (_buffer)->tail = 0; \ |
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27 | } while ( 0 ) |
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28 | |
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29 | #define Ring_buffer_Is_empty( _buffer ) \ |
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30 | ( (_buffer)->head == (_buffer)->tail ) |
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31 | |
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32 | #define Ring_buffer_Is_full( _buffer ) \ |
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33 | ( (_buffer)->head == ((_buffer)->tail + 1) % RINGBUF_QUEUE_LENGTH ) |
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34 | |
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35 | #define Ring_buffer_Add_character( _buffer, _ch ) \ |
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36 | do { \ |
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37 | uint32_t isrlevel; \ |
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38 | \ |
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39 | rtems_interrupt_disable( isrlevel ); \ |
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40 | (_buffer)->tail = ((_buffer)->tail+1) % RINGBUF_QUEUE_LENGTH; \ |
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41 | (_buffer)->buffer[ (_buffer)->tail ] = (_ch); \ |
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42 | rtems_interrupt_enable( isrlevel ); \ |
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43 | } while ( 0 ) |
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44 | |
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45 | #define Ring_buffer_Remove_character( _buffer, _ch ) \ |
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46 | do { \ |
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47 | uint32_t isrlevel; \ |
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48 | \ |
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49 | rtems_interrupt_disable( isrlevel ); \ |
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50 | (_buffer)->head = ((_buffer)->head+1) % RINGBUF_QUEUE_LENGTH; \ |
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51 | (_ch) = (_buffer)->buffer[ (_buffer)->head ]; \ |
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52 | rtems_interrupt_enable( isrlevel ); \ |
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53 | } while ( 0 ) |
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54 | |
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55 | #endif |
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