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Optimizing memory for bit ring buffer

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This commit is contained in:
Andy CA6JAU 2018-07-16 16:04:49 -04:00
parent 1f2ae86612
commit 1fec6e5f77
1 changed files with 9 additions and 4 deletions
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13
BitRB.cpp
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@ -1,7 +1,7 @@
/* /*
TX fifo control - Copyright (C) KI6ZUM 2015 TX fifo control - Copyright (C) KI6ZUM 2015
Copyright (C) 2015,2016 by Jonathan Naylor G4KLX Copyright (C) 2015,2016 by Jonathan Naylor G4KLX
Copyright (C) 2016,2017 by Andy Uribe CA6JAU Copyright (C) 2016,2017,2018 by Andy Uribe CA6JAU
This library is free software; you can redistribute it and/or This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public modify it under the terms of the GNU Library General Public
@ -21,6 +21,11 @@ Boston, MA 02110-1301, USA.
#include "BitRB.h" #include "BitRB.h"
const uint8_t BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
#define READ_BIT1(p,i) ((p[(i)>>3] & BIT_MASK_TABLE[(i)&7]) >> (7 - ((i)&7)))
CBitRB::CBitRB(uint16_t length) : CBitRB::CBitRB(uint16_t length) :
m_length(length), m_length(length),
m_bits(NULL), m_bits(NULL),
@ -30,7 +35,7 @@ m_tail(0U),
m_full(false), m_full(false),
m_overflow(false) m_overflow(false)
{ {
m_bits = new uint8_t[length]; m_bits = new uint8_t[length / 8U];
m_control = new uint8_t[length]; m_control = new uint8_t[length];
} }
@ -68,7 +73,7 @@ bool CBitRB::put(uint8_t bit, uint8_t control)
return false; return false;
} }
m_bits[m_head] = bit; WRITE_BIT1(m_bits, m_head, bit);
m_control[m_head] = control; m_control[m_head] = control;
m_head++; m_head++;
@ -86,7 +91,7 @@ bool CBitRB::get(uint8_t& bit, uint8_t& control)
if (m_head == m_tail && !m_full) if (m_head == m_tail && !m_full)
return false; return false;
bit = m_bits[m_tail]; bit = READ_BIT1(m_bits, m_tail);
control = m_control[m_tail]; control = m_control[m_tail];
m_full = false; m_full = false;