mirror of
https://github.com/elua/elua.git
synced 2025-01-08 20:56:17 +08:00
70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
// eLua "char device" buffering system
|
|
|
|
#ifndef __BUF_H__
|
|
#define __BUF_H__
|
|
|
|
#include "type.h"
|
|
|
|
// [TODO] the buffer data type is currently u8, is this OK?
|
|
typedef u8 t_buf_data;
|
|
|
|
// IDs of "bufferable" devices
|
|
enum
|
|
{
|
|
BUF_ID_UART = 0,
|
|
BUF_ID_ADC = 1,
|
|
BUF_ID_FIRST = BUF_ID_UART,
|
|
BUF_ID_LAST = BUF_ID_ADC,
|
|
BUF_ID_TOTAL = BUF_ID_LAST - BUF_ID_FIRST + 1
|
|
};
|
|
|
|
// This structure describes a buffer
|
|
typedef struct
|
|
{
|
|
u8 logsize;
|
|
volatile u16 wptr, rptr, count;
|
|
t_buf_data *buf;
|
|
u8 logdsize;
|
|
} buf_desc;
|
|
|
|
// Buffer sizes (there are power of 2 to speed up modulo operations)
|
|
enum
|
|
{
|
|
BUF_SIZE_NONE = 0,
|
|
BUF_SIZE_2,
|
|
BUF_SIZE_4,
|
|
BUF_SIZE_8,
|
|
BUF_SIZE_16,
|
|
BUF_SIZE_32,
|
|
BUF_SIZE_64,
|
|
BUF_SIZE_128,
|
|
BUF_SIZE_256,
|
|
BUF_SIZE_512,
|
|
BUF_SIZE_1024,
|
|
BUF_SIZE_2048,
|
|
BUF_SIZE_4096,
|
|
BUF_SIZE_8192,
|
|
BUF_SIZE_16384,
|
|
BUF_SIZE_32768
|
|
};
|
|
|
|
enum
|
|
{
|
|
BUF_DSIZE_U8 = 0,
|
|
BUF_DSIZE_U16,
|
|
BUF_DSIZE_U32
|
|
};
|
|
|
|
|
|
|
|
// Buffer API
|
|
int buf_set(unsigned resid, unsigned resnum, u8 logsize, u8 logdsize);
|
|
int buf_is_enabled( unsigned resid, unsigned resnum );
|
|
unsigned buf_get_size( unsigned resid, unsigned resnum );
|
|
unsigned buf_get_count( unsigned resid, unsigned resnum );
|
|
int buf_write( unsigned resid, unsigned resnum, t_buf_data *data );
|
|
int buf_read( unsigned resid, unsigned resnum, t_buf_data *data );
|
|
void buf_flush( unsigned resid, unsigned resnum );
|
|
|
|
#endif
|