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CFA633-RDI-KU датащи(PDF) 71 Page - Crystalfontz America, Inc.

номер детали CFA633-RDI-KU
подробное описание детали  INTELLIGENT LCD MODULE
PDF  86 Pages
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производитель  CRYSTAIFONTZ [Crystalfontz America, Inc.]
домашняя страница  https://www.crystalfontz.com/
Logo CRYSTAIFONTZ - Crystalfontz America, Inc.

CFA633-RDI-KU датащи(HTML) 71 Page - Crystalfontz America, Inc.

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Crystalfontz America, Inc.
Data Sheet Release Date 2012/02/21
www.crystalfontz.com
CFA633-RDI-KU LCD Module (Hardware v2.0 / Firmware u2v1)
February 2012
Page 71
//Push this byte’s bits through a software
//implementation of a hardware shift & xor.
for(bit_count=0;bit_count<=7;bit_count++)
{
//Shift the CRC accumulator
newCRC>>=1;
//The new MSB of the CRC accumulator comes
//from the LSB of the current data byte.
if(data&0x01)
newCRC|=0x00800000;
//If the low bit of the current CRC accumulator was set
//before the shift, then we need to XOR the accumulator
//with the polynomial (center 16 bits of 0x00840800)
if(newCRC&0x00000080)
newCRC^=0x00840800;
//Shift the data byte to put the next bit of the stream
//into position 0.
data>>=1;
}
}
//All the data has been done. Do 16 more bits of 0 data.
for(bit_count=0;bit_count<=15;bit_count++)
{
//Shift the CRC accumulator
newCRC>>=1;
//If the low bit of the current CRC accumulator was set
//before the shift we need to XOR the accumulator with
//0x00840800.
if(newCRC&0x00000080)
newCRC^=0x00840800;
}
//Return the center 16 bits, making this CRC match the one’s
//complement that is sent in the packet.
return((~newCRC)>>8);
}



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