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#include "EventFilter/CSCRawToDigi/interface/CSCTMBTrailer.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include <iostream>
#include <cassert>
CSCTMBTrailer::CSCTMBTrailer(int wordCount, int firmwareVersion) : theFirmwareVersion(firmwareVersion) {
//FIXME do firmware version
theData[0] = 0x6e0c;
// all the necessary lines from this thing first
wordCount += 5;
// see if we need thePadding to make a multiple of 4
thePadding = 0;
if (wordCount % 4 == 2) {
theData[1] = 0x2AAA;
theData[2] = 0x5555;
thePadding = 2;
wordCount += thePadding;
}
// the next four words start with 11011, or a D
for (int i = 1; i < 5; ++i) {
theData[i + thePadding] = 0xD800;
}
theData[de0fOffset()] = 0xde0f;
// word count excludes the trailer
theData[4 + thePadding] |= wordCount;
}
CSCTMBTrailer::CSCTMBTrailer(const uint16_t* buf, unsigned short int firmwareVersion)
: theFirmwareVersion(firmwareVersion) {
// take a little too much, maybe
memcpy(theData, buf, 14);
switch (firmwareVersion) {
case 2006:
// if there's padding, there'll be a de0f in the 6th word.
// If not, you'll be in CFEB-land, where they won't be de0f.
thePadding = (theData[5] == 0xde0f ? 2 : 0);
break;
case 2007:
///in 2007 format de0f line moved
// =VB= check for 1st word to be 0xDE0F, then check 3rd
// to handle freaky cases of double 0xDE0F signatures in trailer
thePadding = (theData[1] == 0xde0f ? 0 : (theData[3] == 0xde0f ? 2 : 0));
// thePadding = (theData[3] == 0xde0f ? 2 : 0);
break;
default:
edm::LogError("CSCTMBTrailer|CSCRawToDigi") << "failed to contruct: firmware version is bad/not defined!";
}
}
unsigned int CSCTMBTrailer::crc22() const {
return (theData[crcOffset()] & 0x07ff) + ((theData[crcOffset() + 1] & 0x07ff) << 11);
}
void CSCTMBTrailer::setCRC(int crc) {
theData[crcOffset()] |= (crc & 0x07ff);
theData[crcOffset() + 1] |= ((crc >> 11) & 0x07ff);
}
int CSCTMBTrailer::wordCount() const { return theData[4 + thePadding] & 0x7ff; }
void CSCTMBTrailer::selfTest() {
CSCTMBTrailer trailer(104, 2006);
unsigned int crc = 0xb00b1;
trailer.setCRC(crc);
assert(trailer.crc22() == 0xb00b1);
CSCTMBTrailer trailer2(104, 2007);
crc = 0xb00b1;
trailer2.setCRC(crc);
assert(trailer2.crc22() == 0xb00b1);
}
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