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#ifndef _IOE_BUFFER_H_
#define _IOE_BUFFER_H_
// Define new buffer
#define IOEBUFFER(type, name, size) struct { \
uint8_t rindex, windex; \
type data[size]; \
} name;
#define IOEBUFFER_INIT(name, size) { \
name.windex = size - 1; \
name.rindex = size - 1; \
}
#define IOEBUFFER_MODE_BLOCK 0
#define IOEBUFFER_MODE_OVERWRITE 1
#define IOEBUFFER_MODE_DROP 2
#define IOEBUFFER_MODE_ERROR 3
// Add data to buffer. If buffer is full then behavior is defined by selected mode.
#define IOEBUFFER_PUT(name, size, idata, mode) { \
if (mode == IOEBUFFER_MODE_BLOCK) { \
if (name.windex == 0) { \
while (name.rindex == size - 1); \
} else { \
while (name.rindex == name.windex - 1); \
} \
} \
name.data[name.windex] = idata; \
if (mode != IOEBUFFER_MODE_DROP || \
(name.windex == 0 && name.rindex == size - 1) || \
(name.rindex + 1 == name.windex)) { \
if (name.windex == 0) \
name.windex = size - 1; \
else \
name.windex--; \
} \
if (mode == IOEBUFFER_MODE_OVERWRITE && name.windex == name.rindex) { \
if (name.windex == size - 1) \
name.windex = 0; \
else \
name.windex++; \
} }
// Get data from buffer and store it to variable
#define IOEBUFFER_GET(name, size, variable) \
if (name.rindex != name.windex) { \
variable = name.data[name.rindex]; \
if (name.rindex == 0) \
name.rindex = size - 1; \
else \
name.rindex--; \
} else { \
variable = 0; \
}
// Set count of buffered data to variable
#define IOEBUFFER_CNT(name, size, variable) \
if (name.windex < name.rindex) \
variable = name.rindex - name.windex; \
else if (name.windex > name.rindex) \
variable = size - name.windex + name.rindex; \
else \
variable = 0;
/////////////////////////////////////////////////////////////////////
#ifdef CONFIG_IOE_BUFFER
#include <stdint.h>
#define IOEBUFFER_F_MODE_BLOCK 0x0
#define IOEBUFFER_F_MODE_OVERWRITE 0x1
#define IOEBUFFER_F_MODE_DROP 0x2
#define IOEBUFFER_F_MODE_ERROR 0x3
typedef struct {
uint8_t rindex, windex, size, flags;
void **data;
} IOEBuffer;
int8_t ioebuffer_init(IOEBuffer * buf, uint8_t size, uint8_t flags);
void ioebuffer_uninit(IOEBuffer * buf);
int8_t ioebuffer_put(IOEBuffer * buf, void *data);
int8_t ioebuffer_get(IOEBuffer * buf, void **data);
void ioebuffer_clean(IOEBuffer * buf);
uint8_t ioebuffer_cnt(IOEBuffer * buf);
#endif /* CONFIG_IOE_BUFFER */
#endif /* _IOE_BUFFER_H_ */
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