PC -> Nucleo -> RS485 -> STM32 Własny program do komunikacji z uC

Numerbajtu 1    2    3 (4 5 N+2 N+3) N+4

zawartość 0x3A 0x00 CMD PARAMETR CMD CRC

$ pycrc --width 8 --poly 0x07 --reflect-in False --xor-in 0x00 --reflect-out False --xor-out 0x00 --generate=c --algorithm=table-driven

/**

 * \file pycrc_stdout

 * Functions and types for CRC checks.

 *

 * Generated on Thu Jul  5 11:53:44 2018,

 * by pycrc v0.9, https://pycrc.org

 * using the configuration:

 *    Width         = 8

 *    Poly          = 0x07

 *    Xor_In        = 0x00

 *    ReflectIn     = False

 *    Xor_Out       = 0x00

 *    ReflectOut    = False

 *    Algorithm     = table-driven

 *****************************************************************************/

#include "pycrc_stdout.h"     /* include the header file generated with pycrc */

#include <stdlib.h>

#include <stdint.h>



/**

 * Static table used for the table_driven implementation.

 *****************************************************************************/

static const crc_t crc_table[256] = {

    0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,

    0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,

    0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,

    0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,

    0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,

    0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,

    0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,

    0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,

    0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,

    0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,

    0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,

    0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,

    0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,

    0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,

    0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,

    0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3

};



/**

 * Update the crc value with new data.

 *

 * \param crc      The current crc value.

 * \param data     Pointer to a buffer of \a data_len bytes.

 * \param data_len Number of bytes in the \a data buffer.

 * \return         The updated crc value.

 *****************************************************************************/

crc_t crc_update(crc_t crc, const void *data, size_t data_len)

{

    const unsigned char *d = (const unsigned char *)data;

    unsigned int tbl_idx;



    while (data_len--) {

        tbl_idx = (crc ^ *d);

        crc = (crc_table[tbl_idx]) & 0xff;



        d++;

    }

    return crc & 0xff;

}

pycrc --width 8 --poly 0x07 --reflect-in False --xor-in 0x00 --reflect-out False --xor-out 0x00 --generate=c --algorithm=bit-by-bit

/**

 * \file pycrc_stdout

 * Functions and types for CRC checks.

 *

 * Generated on Thu Jul  5 11:54:52 2018,

 * by pycrc v0.9, https://pycrc.org

 * using the configuration:

 *    Width         = 8

 *    Poly          = 0x07

 *    Xor_In        = 0x00

 *    ReflectIn     = False

 *    Xor_Out       = 0x00

 *    ReflectOut    = False

 *    Algorithm     = bit-by-bit

 *****************************************************************************/

#include "pycrc_stdout.h"     /* include the header file generated with pycrc */

#include <stdlib.h>

#include <stdint.h>

#include <stdbool.h>



/**

 * Update the crc value with new data.

 *

 * \param crc      The current crc value.

 * \param data     Pointer to a buffer of \a data_len bytes.

 * \param data_len Number of bytes in the \a data buffer.

 * \return         The updated crc value.

 *****************************************************************************/

crc_t crc_update(crc_t crc, const void *data, size_t data_len)

{

    const unsigned char *d = (const unsigned char *)data;

    unsigned int i;

    bool bit;

    unsigned char c;



    while (data_len--) {

        c = *d++;

        for (i = 0; i < 8; i++) {

            bit = crc & 0x80;

            crc = (crc << 1) | ((c >> (7 - i)) & 0x01);

            if (bit) {

                crc ^= 0x07;

            }

        }

        crc &= 0xff;

    }

    return crc & 0xff;

}





/**

 * Calculate the final crc value.

 *

 * \param crc  The current crc value.

 * \return     The final crc value.

 *****************************************************************************/

crc_t crc_finalize(crc_t crc)

{

    unsigned int i;

    bool bit;



    for (i = 0; i < 8; i++) {

        bit = crc & 0x80;

        crc = (crc << 1) | 0x00;

        if (bit) {

            crc ^= 0x07;

        }

    }

    return (crc ^ 0x00) & 0xff;

}