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RingBuffer.cpp@1:1c3a10f2eb04, 2012-08-31 (annotated)
- Committer:
- ykuroda
- Date:
- Fri Aug 31 17:13:40 2012 +0000
- Revision:
- 1:1c3a10f2eb04
- Parent:
- 0:db7fa84ff50e
- Child:
- 2:ea6d02ba96ae
bug fix
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ykuroda | 1:1c3a10f2eb04 | 1 | // |
ykuroda | 1:1c3a10f2eb04 | 2 | // RingBuffer.cpp ... General purpose ring buffer library |
ykuroda | 1:1c3a10f2eb04 | 3 | // |
ykuroda | 1:1c3a10f2eb04 | 4 | // Copyright 2012 Yoji KURODA |
ykuroda | 1:1c3a10f2eb04 | 5 | // |
ykuroda | 1:1c3a10f2eb04 | 6 | // 2009.11.13 ... Originally written in C by Y.Kuroda for Renesas H83664 |
ykuroda | 1:1c3a10f2eb04 | 7 | // 2012.08.31 ... Code convert for mbed in C++ |
ykuroda | 1:1c3a10f2eb04 | 8 | // |
ykuroda | 1:1c3a10f2eb04 | 9 | |
ykuroda | 0:db7fa84ff50e | 10 | #include "string.h" |
ykuroda | 0:db7fa84ff50e | 11 | #include "RingBuffer.h" |
ykuroda | 0:db7fa84ff50e | 12 | |
ykuroda | 0:db7fa84ff50e | 13 | |
ykuroda | 0:db7fa84ff50e | 14 | /* |
ykuroda | 0:db7fa84ff50e | 15 | * Machine Independent Area |
ykuroda | 0:db7fa84ff50e | 16 | */ |
ykuroda | 0:db7fa84ff50e | 17 | RingBuffer::RingBuffer(int _bufsize) |
ykuroda | 0:db7fa84ff50e | 18 | : bufsize(_bufsize) |
ykuroda | 0:db7fa84ff50e | 19 | { |
ykuroda | 0:db7fa84ff50e | 20 | buf = new unsigned char [bufsize+1]; |
ykuroda | 0:db7fa84ff50e | 21 | |
ykuroda | 0:db7fa84ff50e | 22 | sp = ep = (unsigned int)buf; |
ykuroda | 0:db7fa84ff50e | 23 | memset(buf,0,bufsize); |
ykuroda | 0:db7fa84ff50e | 24 | } |
ykuroda | 0:db7fa84ff50e | 25 | |
ykuroda | 0:db7fa84ff50e | 26 | RingBuffer::~RingBuffer() |
ykuroda | 0:db7fa84ff50e | 27 | { |
ykuroda | 0:db7fa84ff50e | 28 | delete [] buf; |
ykuroda | 0:db7fa84ff50e | 29 | } |
ykuroda | 0:db7fa84ff50e | 30 | |
ykuroda | 0:db7fa84ff50e | 31 | int |
ykuroda | 0:db7fa84ff50e | 32 | RingBuffer::save(unsigned char c) |
ykuroda | 0:db7fa84ff50e | 33 | { |
ykuroda | 0:db7fa84ff50e | 34 | if( (ep==sp-1)|| |
ykuroda | 0:db7fa84ff50e | 35 | ((sp==(unsigned int)buf)&& |
ykuroda | 0:db7fa84ff50e | 36 | (ep==(unsigned int)buf+bufsize-1)) ) /* buffer full */ |
ykuroda | 0:db7fa84ff50e | 37 | return 0; |
ykuroda | 0:db7fa84ff50e | 38 | |
ykuroda | 0:db7fa84ff50e | 39 | *(unsigned char*)ep = c; |
ykuroda | 0:db7fa84ff50e | 40 | ep++; |
ykuroda | 0:db7fa84ff50e | 41 | |
ykuroda | 0:db7fa84ff50e | 42 | if(ep > (unsigned int)buf+bufsize) |
ykuroda | 0:db7fa84ff50e | 43 | ep = (unsigned int)buf; |
ykuroda | 0:db7fa84ff50e | 44 | return 1; |
ykuroda | 0:db7fa84ff50e | 45 | } |
ykuroda | 0:db7fa84ff50e | 46 | |
ykuroda | 0:db7fa84ff50e | 47 | unsigned char |
ykuroda | 0:db7fa84ff50e | 48 | RingBuffer::read(void) |
ykuroda | 0:db7fa84ff50e | 49 | { |
ykuroda | 0:db7fa84ff50e | 50 | unsigned char ret; |
ykuroda | 0:db7fa84ff50e | 51 | |
ykuroda | 0:db7fa84ff50e | 52 | if(sp == ep) |
ykuroda | 0:db7fa84ff50e | 53 | return 0; /* buffer empty */ |
ykuroda | 0:db7fa84ff50e | 54 | |
ykuroda | 0:db7fa84ff50e | 55 | ret = *(unsigned char*)sp; |
ykuroda | 0:db7fa84ff50e | 56 | *(unsigned char*)sp = 0; |
ykuroda | 0:db7fa84ff50e | 57 | sp++; |
ykuroda | 0:db7fa84ff50e | 58 | |
ykuroda | 0:db7fa84ff50e | 59 | if(sp> (unsigned int)buf+bufsize) |
ykuroda | 0:db7fa84ff50e | 60 | sp = (unsigned int)buf; |
ykuroda | 0:db7fa84ff50e | 61 | return ret; |
ykuroda | 0:db7fa84ff50e | 62 | } |
ykuroda | 0:db7fa84ff50e | 63 | |
ykuroda | 0:db7fa84ff50e | 64 | int |
ykuroda | 0:db7fa84ff50e | 65 | RingBuffer::check(void) |
ykuroda | 0:db7fa84ff50e | 66 | { |
ykuroda | 0:db7fa84ff50e | 67 | int n = ep-sp; |
ykuroda | 0:db7fa84ff50e | 68 | if(n<0) |
ykuroda | 0:db7fa84ff50e | 69 | n = bufsize-n; |
ykuroda | 0:db7fa84ff50e | 70 | |
ykuroda | 0:db7fa84ff50e | 71 | return n; |
ykuroda | 0:db7fa84ff50e | 72 | } |
ykuroda | 0:db7fa84ff50e | 73 |