📄 3outof6.c
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/******************************************************************************
File name: 3outof6.c
******************************************************************************/
#include <hal_types.h>
#include <3outof6.h>
//----------------------------------------------------------------------------
// Variables
//----------------------------------------------------------------------------
// Table for encoding for a 4-bit data into 6-bit
// "3 out of 6" coded data.
static uint8 encodeTab[16] = {0x16, // 0x0 "3 out of 6" encoded
0x0D, // 0x1 "3 out of 6" encoded
0x0E, // 0x2 "3 out of 6" encoded
0x0B, // 0x3 "3 out of 6" encoded
0x1C, // 0x4 "3 out of 6" encoded
0x19, // 0x5 "3 out of 6" encoded
0x1A, // 0x6 "3 out of 6" encoded
0x13, // 0x7 "3 out of 6" encoded
0x2C, // 0x8 "3 out of 6" encoded
0x25, // 0x9 "3 out of 6" encoded
0x26, // 0xA "3 out of 6" encoded
0x23, // 0xB "3 out of 6" encoded
0x34, // 0xC "3 out of 6" encoded
0x31, // 0xD "3 out of 6" encoded
0x32, // 0xE "3 out of 6" encoded
0x29}; // 0xF "3 out of 6" encoded
// Table for decoding a 6-bit "3 out of 6" encoded data into 4-bit
// data. The value 0xFF indicates invalid "3 out of 6" coding
static uint8 decodeTab[64] = {0xFF, // "3 out of 6" encoded 0x00 decoded
0xFF, // "3 out of 6" encoded 0x01 decoded
0xFF, // "3 out of 6" encoded 0x02 decoded
0xFF, // "3 out of 6" encoded 0x03 decoded
0xFF, // "3 out of 6" encoded 0x04 decoded
0xFF, // "3 out of 6" encoded 0x05 decoded
0xFF, // "3 out of 6" encoded 0x06 decoded
0xFF, // "3 out of 6" encoded 0x07 decoded
0xFF, // "3 out of 6" encoded 0x08 decoded
0xFF, // "3 out of 6" encoded 0x09 decoded
0xFF, // "3 out of 6" encoded 0x0A decoded
0x03, // "3 out of 6" encoded 0x0B decoded
0xFF, // "3 out of 6" encoded 0x0C decoded
0x01, // "3 out of 6" encoded 0x0D decoded
0x02, // "3 out of 6" encoded 0x0E decoded
0xFF, // "3 out of 6" encoded 0x0F decoded
0xFF, // "3 out of 6" encoded 0x10 decoded
0xFF, // "3 out of 6" encoded 0x11 decoded
0xFF, // "3 out of 6" encoded 0x12 decoded
0x07, // "3 out of 6" encoded 0x13 decoded
0xFF, // "3 out of 6" encoded 0x14 decoded
0xFF, // "3 out of 6" encoded 0x15 decoded
0x00, // "3 out of 6" encoded 0x16 decoded
0xFF, // "3 out of 6" encoded 0x17 decoded
0xFF, // "3 out of 6" encoded 0x18 decoded
0x05, // "3 out of 6" encoded 0x19 decoded
0x06, // "3 out of 6" encoded 0x1A decoded
0xFF, // "3 out of 6" encoded 0x1B decoded
0x04, // "3 out of 6" encoded 0x1C decoded
0xFF, // "3 out of 6" encoded 0x1D decoded
0xFF, // "3 out of 6" encoded 0x1E decoded
0xFF, // "3 out of 6" encoded 0x1F decoded
0xFF, // "3 out of 6" encoded 0x20 decoded
0xFF, // "3 out of 6" encoded 0x21 decoded
0xFF, // "3 out of 6" encoded 0x22 decoded
0x0B, // "3 out of 6" encoded 0x23 decoded
0xFF, // "3 out of 6" encoded 0x24 decoded
0x09, // "3 out of 6" encoded 0x25 decoded
0x0A, // "3 out of 6" encoded 0x26 decoded
0xFF, // "3 out of 6" encoded 0x27 decoded
0xFF, // "3 out of 6" encoded 0x28 decoded
0x0F, // "3 out of 6" encoded 0x29 decoded
0xFF, // "3 out of 6" encoded 0x2A decoded
0xFF, // "3 out of 6" encoded 0x2B decoded
0x08, // "3 out of 6" encoded 0x2C decoded
0xFF, // "3 out of 6" encoded 0x2D decoded
0xFF, // "3 out of 6" encoded 0x2E decoded
0xFF, // "3 out of 6" encoded 0x2F decoded
0xFF, // "3 out of 6" encoded 0x30 decoded
0x0D, // "3 out of 6" encoded 0x31 decoded
0x0E, // "3 out of 6" encoded 0x32 decoded
0xFF, // "3 out of 6" encoded 0x33 decoded
0x0C, // "3 out of 6" encoded 0x34 decoded
0xFF, // "3 out of 6" encoded 0x35 decoded
0xFF, // "3 out of 6" encoded 0x36 decoded
0xFF, // "3 out of 6" encoded 0x37 decoded
0xFF, // "3 out of 6" encoded 0x38 decoded
0xFF, // "3 out of 6" encoded 0x39 decoded
0xFF, // "3 out of 6" encoded 0x3A decoded
0xFF, // "3 out of 6" encoded 0x3B decoded
0xFF, // "3 out of 6" encoded 0x3C decoded
0xFF, // "3 out of 6" encoded 0x3D decoded
0xFF, // "3 out of 6" encoded 0x3E decoded
0xFF}; // "3 out of 6" encoded 0x3F decoded
//----------------------------------------------------------------------------
// Functions
//----------------------------------------------------------------------------
//----------------------------------------------------------------------------
// void encode3outof6 (uint8 *uncodedData, uint8 *encodedData, uint8 lastByte)
//
// DESCRIPTION:
// Performs the "3 out 6" encoding on a 16-bit data value into a
// 24-bit data value. When encoding on a 8 bit variable, a postamle
// sequence is added.
//
// ARGUMENTS:
// uint8 *uncodedData - Pointer to data
// uint8 *encodedData - Pointer to store the encoded data
// uint8 lastByte - Only one byte left in data buffer
//----------------------------------------------------------------------------
void encode3outof6 (uint8 *uncodedData, uint8 *encodedData, uint8 lastByte)
{
uint8 data[4];
// - Perform encoding -
// If last byte insert postamble sequence
if (lastByte)
{
data[1] = 0x14;
}
else
{
data[0] = encodeTab[*(uncodedData + 1) & 0x0F];
data[1] = encodeTab[(*(uncodedData + 1) >> 4) & 0x0F];
}
data[2] = encodeTab[(*uncodedData) & 0x0F];
data[3] = encodeTab[((*uncodedData) >> 4) & 0x0F];
// - Shift the encoded 6-bit values into a byte buffer -
*(encodedData + 0) = (data[3] << 2) | (data[2] >> 4);
*(encodedData + 1) = (data[2] << 4) | (data[1] >> 2);
if (!lastByte)
{
*(encodedData + 2) = (data[1] << 6) | data[0];
}
}
//----------------------------------------------------------------------------
// uint8 decode3outof6 (uint8 *encodedData, uint8 *decodedData, uint8 lastByte)
//
// DESCRIPTION:
// Performs the "3 out 6" decoding of a 24-bit data value into 16-bit
// data value. If only 2 byte left to decoded,
// the postamble sequence is ignored
//
// ARGUMENTS:
// uint8 *encodedData - Pointer to encoded data
// uint8 *decodedData - Pointer to store the decoded data
// uint8 lastByte - Only one byte left in data buffer
//
// RETURNS
// DECODING_3OUTOF6_OK 0
// DECODING_3OUTOF6_ERROR 1
//----------------------------------------------------------------------------
uint8 decode3outof6(uint8 *encodedData, uint8 *decodedData, uint8 lastByte)
{
uint8 data[4];
// - Perform decoding on the input data -
if (!lastByte)
{
data[0] = decodeTab[(*(encodedData + 2) & 0x3F)];
data[1] = decodeTab[((*(encodedData + 2) & 0xC0) >> 6) | ((*(encodedData + 1) & 0x0F) << 2)];
}
// If last byte, ignore postamble sequence
else
{
data[0] = 0x00;
data[1] = 0x00;
}
data[2] = decodeTab[((*(encodedData + 1) & 0xF0) >> 4) | ((*encodedData & 0x03) << 4)];
data[3] = decodeTab[((*encodedData & 0xFC) >> 2)];
// - Check for invalid data coding -
if ( (data[0] == 0xFF) | (data[1] == 0xFF) |
(data[2] == 0xFF) | (data[3] == 0xFF) )
return(DECODING_3OUTOF6_ERROR);
// - Shift the encoded values into a byte buffer -
*decodedData = (data[3] << 4) | (data[2]);
if (!lastByte)
*(decodedData + 1) = (data[1] << 4) | (data[0]);
return(DECODING_3OUTOF6_OK);
}
/***********************************************************************************
Copyright 2008 Texas Instruments Incorporated. All rights reserved.
IMPORTANT: Your use of this Software is limited to those specific rights
granted under the terms of a software license agreement between the user
who downloaded the software, his/her employer (which must be your employer)
and Texas Instruments Incorporated (the "License"). You may not use this
Software unless you agree to abide by the terms of the License. The License
limits your use, and you acknowledge, that the Software may not be modified,
copied or distributed unless embedded on a Texas Instruments microcontroller
or used solely and exclusively in conjunction with a Texas Instruments radio
frequency transceiver, which is integrated into your product. Other than for
the foregoing purpose, you may not use, reproduce, copy, prepare derivative
works of, modify, distribute, perform, display or sell this Software and/or
its documentation for any purpose.
YOU FURTHER ACKNOWLEDGE AND AGREE THAT THE SOFTWARE AND DOCUMENTATION ARE
PROVIDED 揂S IS⌨️ 快捷键说明
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