b85a3e4a
 Peter M. Groen
Setting up workin...
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#include <stdlib.h>
#include "stdint.h"
#include <string.h>
#include <assert.h>
#include <arpa/inet.h>
#include <config.h>
#include "modbus.h"
#if defined(HAVE_BYTESWAP_H)
# include <byteswap.h>
#endif
#if defined(__GNUC__)
# define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__ * 10)
# if GCC_VERSION >= 430
// Since GCC >= 4.30, GCC provides __builtin_bswapXX() alternatives so we switch to them
# undef bswap_32
# define bswap_32 __builtin_bswap32
# endif
#endif
#if !defined(__CYGWIN__) && !defined(bswap_16)
#pragma message "Fallback on C functions for bswap_16"
static inline uint16_t bswap_16(uint16_t x)
{
return (x >> 8) | (x << 8);
}
#endif
#if !defined(bswap_32)
#pragma message "Fallback on C functions for bswap_32"
static inline uint32_t bswap_32(uint32_t x)
{
return (bswap_16(x & 0xffff) << 16) | (bswap_16(x >> 16));
}
#endif
/* Sets many bits from a single byte value (all 8 bits of the byte value are
set) */
void modbus_set_bits_from_byte( uint8_t *dest, int idx, const uint8_t value )
{
int i;
for (i=0; i < 8; i++)
{
dest[idx+i] = (value & (1 << i)) ? 1 : 0;
}
}
/* Sets many bits from a table of bytes (only the bits between idx and
idx + nb_bits are set) */
void modbus_set_bits_from_bytes( uint8_t *dest, int idx, unsigned int nb_bits, const uint8_t *tab_byte )
{
unsigned int i;
int shift = 0;
for ( i = idx; i < idx + nb_bits; i++ )
{
dest[i] = tab_byte[(i - idx) / 8] & (1 << shift) ? 1 : 0;
/* gcc doesn't like: shift = (++shift) % 8; */
shift++;
shift %= 8;
}
}
/* Gets the byte value from many bits.
To obtain a full byte, set nb_bits to 8. */
uint8_t modbus_get_byte_from_bits( const uint8_t *src, int idx, unsigned int nb_bits )
{
unsigned int i;
uint8_t value = 0;
if (nb_bits > 8)
{
/* Assert is ignored if NDEBUG is set */
assert(nb_bits < 8);
nb_bits = 8;
}
for (i=0; i < nb_bits; i++)
{
value |= (src[idx+i] << i);
}
return value;
}
/* Get a float from 4 bytes (Modbus) without any conversion (ABCD) */
float modbus_get_float_abcd(const uint16_t *src)
{
float f;
uint32_t i;
i = ntohl(((uint32_t)src[0] << 16) + src[1]);
memcpy(&f, &i, sizeof(float));
return f;
}
/* Get a float from 4 bytes (Modbus) in inversed format (DCBA) */
float modbus_get_float_dcba(const uint16_t *src)
{
float f;
uint32_t i;
i = ntohl(bswap_32((((uint32_t)src[0]) << 16) + src[1]));
memcpy(&f, &i, sizeof(float));
return f;
}
/* Get a float from 4 bytes (Modbus) with swapped bytes (BADC) */
float modbus_get_float_badc(const uint16_t *src)
{
float f;
uint32_t i;
i = ntohl((uint32_t)(bswap_16(src[0]) << 16) + bswap_16(src[1]));
memcpy(&f, &i, sizeof(float));
return f;
}
/* Get a float from 4 bytes (Modbus) with swapped words (CDAB) */
float modbus_get_float_cdab(const uint16_t *src)
{
float f;
uint32_t i;
i = ntohl((((uint32_t)src[1]) << 16) + src[0]);
memcpy(&f, &i, sizeof(float));
return f;
}
/* DEPRECATED - Get a float from 4 bytes in sort of Modbus format */
float modbus_get_float(const uint16_t *src)
{
float f;
uint32_t i;
i = (((uint32_t)src[1]) << 16) + src[0];
memcpy(&f, &i, sizeof(float));
return f;
}
/* Set a float to 4 bytes for Modbus w/o any conversion (ABCD) */
void modbus_set_float_abcd(float f, uint16_t *dest)
{
uint32_t i;
memcpy(&i, &f, sizeof(uint32_t));
i = htonl(i);
dest[0] = (uint16_t)(i >> 16);
dest[1] = (uint16_t)i;
}
/* Set a float to 4 bytes for Modbus with byte and word swap conversion (DCBA) */
void modbus_set_float_dcba(float f, uint16_t *dest)
{
uint32_t i;
memcpy(&i, &f, sizeof(uint32_t));
i = bswap_32(htonl(i));
dest[0] = (uint16_t)(i >> 16);
dest[1] = (uint16_t)i;
}
/* Set a float to 4 bytes for Modbus with byte swap conversion (BADC) */
void modbus_set_float_badc(float f, uint16_t *dest)
{
uint32_t i;
memcpy(&i, &f, sizeof(uint32_t));
i = htonl(i);
dest[0] = (uint16_t)bswap_16(i >> 16);
dest[1] = (uint16_t)bswap_16(i & 0xFFFF);
}
/* Set a float to 4 bytes for Modbus with word swap conversion (CDAB) */
void modbus_set_float_cdab(float f, uint16_t *dest)
{
uint32_t i;
memcpy(&i, &f, sizeof(uint32_t));
i = htonl(i);
dest[0] = (uint16_t)i;
dest[1] = (uint16_t)(i >> 16);
}
/* DEPRECATED - Set a float to 4 bytes in a sort of Modbus format! */
void modbus_set_float(float f, uint16_t *dest)
{
uint32_t i;
memcpy(&i, &f, sizeof(uint32_t));
dest[0] = (uint16_t)i;
dest[1] = (uint16_t)(i >> 16);
}
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