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latticeBitParser.cpp: revert/adapts commit 0bc2594469 (fails with CMSIS-DAP #634)

This commit is contained in:
Gwenhael Goavec-Merou 2026-03-04 10:28:23 +01:00
parent cde80a5a85
commit 21d2e46c4f
1 changed files with 8 additions and 7 deletions
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15
src/latticeBitParser.cpp
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@ -73,10 +73,10 @@ int LatticeBitParser::parseHeader()
printError("Wrong preamble key");
return EXIT_FAILURE;
}
_endHeader = pos - 3; // align to 2 Dummy bits + preamble (ie. Header start offset).
_endHeader = pos - 4; // align to 3 Dummy Bytes + preamble (ie. Header start offset).
/* parse header */
istringstream lineStream(_raw_data.substr(currPos, _endHeader - currPos - 1));
istringstream lineStream(_raw_data.substr(currPos, _endHeader - currPos));
string buff;
while (std::getline(lineStream, buff, '\0')) {
pos = buff.find_first_of(':', 0);
@ -98,7 +98,7 @@ int LatticeBitParser::parse()
return EXIT_FAILURE;
/* check preamble */
uint32_t preamble = (*(uint32_t *)&_raw_data[_endHeader]);
uint32_t preamble = (*(uint32_t *)&_raw_data[_endHeader + 1]);
//0xb3beffff is the preamble for encrypted bitstreams in Nexus fpgas
if ((preamble != 0xb3bdffff) && (preamble != 0xb3bfffff) && (preamble != 0xb3beffff)) {
printError("Error: missing preamble\n");
@ -138,18 +138,19 @@ int LatticeBitParser::parse()
/* According to FPGA-TN-02192-3.4
* the Lattice ECP3 must trasnmit at least 128 clock pulses before
* receiving the preamble.
* Here the header contains 16 Dummy bit + preamble so only
* 14bits 8x14= 112bits must be added as padding.
* Here the header contains 3x8 Dummy bit + preamble so only
* 13bits 8x13= 112bits must be added as padding.
*/
const uint32_t offset = (_is_ecp3) ? 14 : 0;
_bit_data.resize(_raw_data.size() - _endHeader + offset);
if (_is_ecp3) {
std::string tmp(14, 0xff);
std::string tmp(13, 0xff);
std::move(tmp.begin(), tmp.end(), _bit_data.begin());
}
std::move(_raw_data.begin() + _endHeader, _raw_data.end(), _bit_data.begin() + offset);
_bit_length = _bit_data.size() * 8;
} else {
_endHeader++;
const uint32_t len = _raw_data.size() - _endHeader;
uint32_t max_len = 16;
for (uint32_t i = 0; i < len; i+=max_len) {
@ -183,7 +184,7 @@ int LatticeBitParser::parse()
bool LatticeBitParser::parseCfgData()
{
uint8_t *ptr;
size_t pos = _endHeader + 4; // drop 16 Dummy bits and preamble
size_t pos = _endHeader + 5; // drop 16 Dummy bits and preamble
uint32_t idcode;
char __buf[10];
int __buf_valid_bytes;