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AP_HAL: create a common utility/RingBuffer.h header

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This commit is contained in:
Andrew Tridgell 2015-01-07 08:04:08 +11:00
parent 43c88c37eb
commit 6fb00f4fc3
2 changed files with 22 additions and 9 deletions
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9
libraries/AP_HAL/UARTDriver.h
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@ -7,15 +7,6 @@
#include "AP_HAL_Namespace.h"
#include "utility/BetterStream.h"
/*
buffer handling macros
*/
#define BUF_AVAILABLE(buf) ((buf##_head > (_tail=buf##_tail))? (buf##_size - buf##_head) + _tail: _tail - buf##_head)
#define BUF_SPACE(buf) (((_head=buf##_head) > buf##_tail)?(_head - buf##_tail) - 1:((buf##_size - buf##_tail) + _head) - 1)
#define BUF_EMPTY(buf) (buf##_head == buf##_tail)
#define BUF_ADVANCETAIL(buf, n) buf##_tail = (buf##_tail + n) % buf##_size
#define BUF_ADVANCEHEAD(buf, n) buf##_head = (buf##_head + n) % buf##_size
/* Pure virtual UARTDriver class */
class AP_HAL::UARTDriver : public AP_HAL::BetterStream {
public:

22
libraries/AP_HAL/utility/RingBuffer.h Normal file
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@ -0,0 +1,22 @@
#ifndef __AP_HAL_UTILITY_RINGBUFFER_H__
#define __AP_HAL_UTILITY_RINGBUFFER_H__
/*
common ring buffer handling macros
These macros assume a ring buffer like this:
uint8_t *_buf;
uint16_t _buf_size;
volatile uint16_t _buf_head;
volatile uint16_t _buf_tail;
These should be converted to a class in future
*/
#define BUF_AVAILABLE(buf) ((buf##_head > (_tail=buf##_tail))? (buf##_size - buf##_head) + _tail: _tail - buf##_head)
#define BUF_SPACE(buf) (((_head=buf##_head) > buf##_tail)?(_head - buf##_tail) - 1:((buf##_size - buf##_tail) + _head) - 1)
#define BUF_EMPTY(buf) (buf##_head == buf##_tail)
#define BUF_ADVANCETAIL(buf, n) buf##_tail = (buf##_tail + n) % buf##_size
#define BUF_ADVANCEHEAD(buf, n) buf##_head = (buf##_head + n) % buf##_size
#endif // __AP_HAL_UTILITY_RINGBUFFER_H__