157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
#ifndef _LFS_CONFIG_H_
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#define _LFS_CONFIG_H_
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// System includes
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#include <string.h>
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#include "UART.h"
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#include "utils.h"
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#include "lfs_trace.h"
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// Macros, may be replaced by system specific wrappers. Arguments to these
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// macros must not have side-effects as the macros can be removed for a smaller
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// code footprint
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// Logging functions
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#ifndef LFS_NO_DEBUG
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#define LFS_DEBUG(fmt, ...) \
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CPUartLogPrintf("lfs debug:%d: " fmt "\n", __LINE__, __VA_ARGS__)
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#else
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#define LFS_DEBUG(fmt, ...)
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#endif
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#ifndef LFS_NO_WARN
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#define LFS_WARN(fmt, ...) \
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CPUartLogPrintf("lfs warn:%d: " fmt "\n", __LINE__, __VA_ARGS__)
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#else
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#define LFS_WARN(fmt, ...)
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#endif
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#ifndef LFS_NO_ERROR
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#define LFS_ERROR(fmt, ...) \
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CPUartLogPrintf("lfs error:%d: " fmt "\n", __LINE__, __VA_ARGS__)
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#else
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#define LFS_ERROR(fmt, ...)
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#endif
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// Runtime assertions
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#ifndef LFS_NO_ASSERT
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#define LFS_ASSERT(test) ASSERT(test)
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#else
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#define LFS_ASSERT(test)
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#endif
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// Builtin functions, these may be replaced by more efficient
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// toolchain-specific implementations. LFS_NO_INTRINSICS falls back to a more
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// expensive basic C implementation for debugging purposes
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// Min/max functions for unsigned 32-bit numbers
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static inline UINT32 lfs_max(UINT32 a, UINT32 b) {
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return (a > b) ? a : b;
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}
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static inline UINT32 lfs_min(UINT32 a, UINT32 b) {
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return (a < b) ? a : b;
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}
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// Find the next smallest power of 2 less than or equal to a
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static inline UINT32 lfs_npw2(UINT32 a) {
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#if 0
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return 32 - __builtin_clz(a-1);
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#else
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UINT32 r = 0;
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UINT32 s;
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a -= 1;
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s = (a > 0xffff) << 4; a >>= s; r |= s;
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s = (a > 0xff ) << 3; a >>= s; r |= s;
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s = (a > 0xf ) << 2; a >>= s; r |= s;
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s = (a > 0x3 ) << 1; a >>= s; r |= s;
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return (r | (a >> 1)) + 1;
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#endif
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}
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// Count the number of trailing binary zeros in a
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// lfs_ctz(0) may be undefined
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static inline UINT32 lfs_ctz(UINT32 a) {
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#if 0
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return __builtin_ctz(a);
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#else
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return lfs_npw2((a & -a) + 1) - 1;
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#endif
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}
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// Count the number of binary ones in a
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static inline UINT32 lfs_popc(UINT32 a) {
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#if 0
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return __builtin_popcount(a);
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#else
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a = a - ((a >> 1) & 0x55555555);
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a = (a & 0x33333333) + ((a >> 2) & 0x33333333);
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return (((a + (a >> 4)) & 0xf0f0f0f) * 0x1010101) >> 24;
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#endif
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}
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// Find the sequence comparison of a and b, this is the distance
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// between a and b ignoring overflow
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static inline int lfs_scmp(UINT32 a, UINT32 b) {
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return (int)(unsigned)(a - b);
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}
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// Convert from 32-bit little-endian to native order
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#if 0
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static inline UINT32 lfs_fromle32(UINT32 a) {
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#if !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && BYTE_ORDER == ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__))
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return a;
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#elif !defined(LFS_NO_INTRINSICS) && ( \
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(defined( BYTE_ORDER ) && BYTE_ORDER == ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER ) && __BYTE_ORDER == __ORDER_BIG_ENDIAN ) || \
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(defined(__BYTE_ORDER__) && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__))
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return __builtin_bswap32(a);
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#else
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return (((UINT8*)&a)[0] << 0) |
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(((UINT8*)&a)[1] << 8) |
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(((UINT8*)&a)[2] << 16) |
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(((UINT8*)&a)[3] << 24);
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#endif
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}
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// Convert to 32-bit little-endian from native order
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static inline UINT32 lfs_tole32(UINT32 a) {
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return lfs_fromle32(a);
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}
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#else
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#define lfs_fromle32(a) a
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#define lfs_tole32(a) a
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#endif
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// Calculate CRC-32 with polynomial = 0x04c11db7
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void lfs_crc(UINT32 *crc, const void *buffer, size_t size);
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// Allocate memory, only used if buffers are not provided to littlefs
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#if 0
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static inline void *lfs_malloc(size_t size) {
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#ifndef LFS_NO_MALLOC
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return rt_malloc(size);
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#else
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return NULL;
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#endif
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}
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// Deallocate memory, only used if buffers are not provided to littlefs
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static inline void lfs_free(void *p) {
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#ifndef LFS_NO_MALLOC
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rt_free(p);
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#endif
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}
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#else
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#define lfs_malloc malloc
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#define lfs_free free
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extern void *malloc( size_t Size );
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extern void free( void *p );
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#endif
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#endif
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