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70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
// eLua "char device" buffering system
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#ifndef __BUF_H__
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#define __BUF_H__
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#include "type.h"
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// [TODO] the buffer data type is currently u8, is this OK?
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typedef u8 t_buf_data;
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// IDs of "bufferable" devices
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enum
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{
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BUF_ID_UART = 0,
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BUF_ID_ADC = 1,
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BUF_ID_FIRST = BUF_ID_UART,
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BUF_ID_LAST = BUF_ID_ADC,
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BUF_ID_TOTAL = BUF_ID_LAST - BUF_ID_FIRST + 1
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};
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// This structure describes a buffer
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typedef struct
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{
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u8 logsize;
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u8 logdsize;
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volatile u16 wptr, rptr, count;
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t_buf_data *buf;
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} buf_desc;
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// Buffer sizes (there are power of 2 to speed up modulo operations)
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enum
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{
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BUF_SIZE_NONE = 0,
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BUF_SIZE_2,
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BUF_SIZE_4,
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BUF_SIZE_8,
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BUF_SIZE_16,
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BUF_SIZE_32,
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BUF_SIZE_64,
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BUF_SIZE_128,
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BUF_SIZE_256,
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BUF_SIZE_512,
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BUF_SIZE_1024,
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BUF_SIZE_2048,
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BUF_SIZE_4096,
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BUF_SIZE_8192,
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BUF_SIZE_16384,
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BUF_SIZE_32768
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};
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enum
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{
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BUF_DSIZE_U8 = 0,
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BUF_DSIZE_U16,
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BUF_DSIZE_U32
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};
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// Buffer API
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int buf_set(unsigned resid, unsigned resnum, u8 logsize, u8 logdsize);
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int buf_is_enabled( unsigned resid, unsigned resnum );
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unsigned buf_get_size( unsigned resid, unsigned resnum );
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unsigned buf_get_count( unsigned resid, unsigned resnum );
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int buf_write( unsigned resid, unsigned resnum, t_buf_data *data );
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int buf_read( unsigned resid, unsigned resnum, t_buf_data *data );
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void buf_flush( unsigned resid, unsigned resnum );
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#endif
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