Renjian Hao / Mbed 2 deprecated Fish_2014Fall

Renjian Hao

Dependencies:   L3G4200D L3GD20 LSM303DLHC LSM303DLM PwmIn Servo mbed

Fork of Fish_2014Fall by Zhan Tu

iSerial/RingBuffer/RingBuffer.cpp@5:a5f0395d2fa4, 2015-08-13 (annotated)

Committer:
RenjianHao
Date:
Thu Aug 13 18:37:15 2015 +0000
Revision:
5:a5f0395d2fa4
Parent:
0:8f37781c0054 
Renjian Hao2015/8/13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tzxl10000 0:8f37781c0054 1 //
tzxl10000 0:8f37781c0054 2 // RingBuffer.cpp ... General purpose ring buffer library
tzxl10000 0:8f37781c0054 3 //
tzxl10000 0:8f37781c0054 4 // Copyright 2012 Yoji KURODA
tzxl10000 0:8f37781c0054 5 //
tzxl10000 0:8f37781c0054 6 // 2009.11.13 ... Originally written in C by Y.Kuroda for Renesas H83664
tzxl10000 0:8f37781c0054 7 // 2012.08.31 ... Code convert for mbed in C++
tzxl10000 0:8f37781c0054 8 //
tzxl10000 0:8f37781c0054 9
tzxl10000 0:8f37781c0054 10 #include "string.h"
tzxl10000 0:8f37781c0054 11 #include "RingBuffer.h"
tzxl10000 0:8f37781c0054 12
tzxl10000 0:8f37781c0054 13
tzxl10000 0:8f37781c0054 14 /*
tzxl10000 0:8f37781c0054 15 * Machine Independent Area
tzxl10000 0:8f37781c0054 16 */
tzxl10000 0:8f37781c0054 17 RingBuffer::RingBuffer(int _bufsize)
tzxl10000 0:8f37781c0054 18 : bufsize(_bufsize)
tzxl10000 0:8f37781c0054 19 {
tzxl10000 0:8f37781c0054 20 buf = new unsigned char [bufsize+1];
tzxl10000 0:8f37781c0054 21
tzxl10000 0:8f37781c0054 22 sp = ep = (unsigned int)buf;
tzxl10000 0:8f37781c0054 23 memset(buf,0,bufsize);
tzxl10000 0:8f37781c0054 24 }
tzxl10000 0:8f37781c0054 25
tzxl10000 0:8f37781c0054 26 RingBuffer::~RingBuffer()
tzxl10000 0:8f37781c0054 27 {
tzxl10000 0:8f37781c0054 28 delete [] buf;
tzxl10000 0:8f37781c0054 29 }
tzxl10000 0:8f37781c0054 30
tzxl10000 0:8f37781c0054 31 int
tzxl10000 0:8f37781c0054 32 RingBuffer::save(unsigned char c)
tzxl10000 0:8f37781c0054 33 {
tzxl10000 0:8f37781c0054 34 if( (ep==sp-1)||
tzxl10000 0:8f37781c0054 35 ((sp==(unsigned int)buf)&&
tzxl10000 0:8f37781c0054 36 (ep==(unsigned int)buf+bufsize-1)) ) /* buffer full */
tzxl10000 0:8f37781c0054 37 return 0;
tzxl10000 0:8f37781c0054 38
tzxl10000 0:8f37781c0054 39 *(unsigned char*)ep = c;
tzxl10000 0:8f37781c0054 40 ep++;
tzxl10000 0:8f37781c0054 41
tzxl10000 0:8f37781c0054 42 if(ep > (unsigned int)buf+bufsize)
tzxl10000 0:8f37781c0054 43 ep = (unsigned int)buf;
tzxl10000 0:8f37781c0054 44 return 1;
tzxl10000 0:8f37781c0054 45 }
tzxl10000 0:8f37781c0054 46
tzxl10000 0:8f37781c0054 47 unsigned char
tzxl10000 0:8f37781c0054 48 RingBuffer::read(void)
tzxl10000 0:8f37781c0054 49 {
tzxl10000 0:8f37781c0054 50 unsigned char ret;
tzxl10000 0:8f37781c0054 51
tzxl10000 0:8f37781c0054 52 if(sp == ep)
tzxl10000 0:8f37781c0054 53 return 0; /* buffer empty */
tzxl10000 0:8f37781c0054 54
tzxl10000 0:8f37781c0054 55 ret = *(unsigned char*)sp;
tzxl10000 0:8f37781c0054 56 *(unsigned char*)sp = 0;
tzxl10000 0:8f37781c0054 57 sp++;
tzxl10000 0:8f37781c0054 58
tzxl10000 0:8f37781c0054 59 if(sp> (unsigned int)buf+bufsize)
tzxl10000 0:8f37781c0054 60 sp = (unsigned int)buf;
tzxl10000 0:8f37781c0054 61 return ret;
tzxl10000 0:8f37781c0054 62 }
tzxl10000 0:8f37781c0054 63
tzxl10000 0:8f37781c0054 64 int
tzxl10000 0:8f37781c0054 65 RingBuffer::check(void)
tzxl10000 0:8f37781c0054 66 {
tzxl10000 0:8f37781c0054 67 int n = ep-sp;
tzxl10000 0:8f37781c0054 68 if(n<0)
tzxl10000 0:8f37781c0054 69 n = bufsize-n;
tzxl10000 0:8f37781c0054 70
tzxl10000 0:8f37781c0054 71 return n;
tzxl10000 0:8f37781c0054 72 }
tzxl10000 0:8f37781c0054 73