mirror of https://github.com/rusefi/rusefi.git
114 lines
2.8 KiB
C++
114 lines
2.8 KiB
C++
/**
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* See also BinarySensorLog.java
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* See also mlq_file_format.txt
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*/
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#include "pch.h"
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#include "binary_logging.h"
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#include "log_field.h"
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#include "buffered_writer.h"
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#define TIME_PRECISION 1000
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// floating number of seconds with millisecond precision
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static scaled_channel<uint32_t, TIME_PRECISION> packedTime;
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// todo: we are at the edge of sdLogBuffer size and at the moment we have no code to make sure buffer does not overflow
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// todo: make this logic smarter
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// The list of logged fields lives in a separate file so it can eventually be tool-generated
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#include "log_fields_generated.h"
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static constexpr uint16_t computeFieldsRecordLength() {
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uint16_t recLength = 0;
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for (size_t i = 0; i < efi::size(fields); i++) {
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recLength += fields[i].getSize();
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}
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return recLength;
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}
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static constexpr uint16_t recordLength = computeFieldsRecordLength();
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void writeHeader(Writer& outBuffer) {
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char buffer[MLQ_HEADER_SIZE];
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// File format: MLVLG\0
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strncpy(buffer, "MLVLG", 6);
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// Format version = 01
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buffer[6] = 0;
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buffer[7] = 1;
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// Timestamp
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buffer[8] = 0;
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buffer[9] = 0;
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buffer[10] = 0;
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buffer[11] = 0;
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// Info data start
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buffer[12] = 0;
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buffer[13] = 0;
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size_t headerSize = MLQ_HEADER_SIZE + efi::size(fields) * 55;
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// Data begin index: begins immediately after the header
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buffer[14] = 0;
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buffer[15] = 0;
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buffer[16] = (headerSize >> 8) & 0xFF;
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buffer[17] = headerSize & 0xFF;
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// Record length - length of a single data record: sum size of all fields
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buffer[18] = recordLength >> 8;
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buffer[19] = recordLength & 0xFF;
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// Number of logger fields
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buffer[20] = 0;
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buffer[21] = efi::size(fields);
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outBuffer.write(buffer, MLQ_HEADER_SIZE);
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// Write the actual logger fields, offset 22
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for (size_t i = 0; i < efi::size(fields); i++) {
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fields[i].writeHeader(outBuffer);
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}
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}
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static uint8_t blockRollCounter = 0;
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size_t writeBlock(char* buffer) {
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// Offset 0 = Block type, standard data block in this case
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buffer[0] = 0;
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// Offset 1 = rolling counter sequence number
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buffer[1] = blockRollCounter++;
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// Offset 2, size 2 = Timestamp at 10us resolution
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uint16_t timestamp = getTimeNowUs() / 10;
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buffer[2] = timestamp >> 8;
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buffer[3] = timestamp & 0xFF;
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packedTime = currentTimeMillis() * 1.0 / TIME_PRECISION;
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// Offset 4 = field data
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const char* dataBlockStart = buffer + 4;
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char* dataBlock = buffer + 4;
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for (size_t i = 0; i < efi::size(fields); i++) {
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size_t entrySize = fields[i].writeData(dataBlock);
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// Increment pointer to next entry
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dataBlock += entrySize;
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}
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size_t dataBlockSize = dataBlock - dataBlockStart;
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// "CRC" at the end is just the sum of all bytes
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uint8_t sum = 0;
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for (size_t i = 0; i < dataBlockSize; i++) {
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sum += dataBlockStart[i];
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}
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*dataBlock = sum;
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// Total size has 4 byte header + 1 byte checksum
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return dataBlockSize + 5;
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}
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