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/*************************************************************************
* Telematics Data Logger Class
* Distributed under BSD license
* Written by Stanley Huang <support@freematics.com.au>
* Visit http://freematics.com for more information
*************************************************************************/
// additional custom PID for data logger
#define PID_DATA_SIZE 0x80
#if ENABLE_DATA_LOG
File sdfile;
#endif
class CDataLogger {
public:
CDataLogger():m_lastDataTime(0),dataTime(0),dataSize(0)
{
#if ENABLE_DATA_CACHE
cacheBytes = 0;
#endif
}
void initSender()
{
#if ENABLE_DATA_OUT
Serial.begin(STREAM_BAUDRATE);
#endif
}
byte genTimestamp(char* buf, bool absolute)
{
byte n;
if (absolute || dataTime >= m_lastDataTime + 60000) {
// absolute timestamp
n = sprintf_P(buf, PSTR("#%lu,"), dataTime);
} else {
// relative timestamp
uint16_t elapsed = (unsigned int)(dataTime - m_lastDataTime);
n = sprintf_P(buf, PSTR("%u,"), elapsed);
}
return n;
}
void record(const char* buf, byte len)
{
#if ENABLE_DATA_LOG
char tmp[12];
byte n = genTimestamp(tmp, dataSize == 0);
dataSize += sdfile.write((uint8_t*)tmp, n);
dataSize += sdfile.write(buf, len);
sdfile.write('\n');
dataSize++;
#endif
m_lastDataTime = dataTime;
}
void dispatch(const char* buf, byte len)
{
#if ENABLE_DATA_CACHE
// reserve some space for timestamp, ending white space and zero terminator
int l = cacheBytes + len + 12 - CACHE_SIZE;
if (l >= 0) {
// cache full
#if CACHE_SHIFT
// discard the oldest data
for (l = CACHE_SIZE / 2; cache[l] && cache[l] != ' '; l++);
if (cache[l]) {
cacheBytes -= l;
memcpy(cache, cache + l + 1, cacheBytes);
} else {
cacheBytes = 0;
}
#else
return;
#endif
}
// add new data at the end
byte n = genTimestamp(cache + cacheBytes, cacheBytes == 0);
if (n == 0) {
// same timestamp
cache[cacheBytes - 1] = ';';
} else {
cacheBytes += n;
cache[cacheBytes++] = ',';
}
if (cacheBytes + len < CACHE_SIZE - 1) {
memcpy(cache + cacheBytes, buf, len);
cacheBytes += len;
cache[cacheBytes++] = ' ';
}
cache[cacheBytes] = 0;
#else
//char tmp[12];
//byte n = genTimestamp(tmp, dataTime >= m_lastDataTime + 100);
//Serial.write(tmp, n);
#endif
#if ENABLE_DATA_OUT
Serial.write((uint8_t*)buf, len);
Serial.println();
#endif
}
void logData(const char* buf, byte len)
{
dispatch(buf, len);
record(buf, len);
}
void logData(uint16_t pid)
{
char buf[8];
byte len = translatePIDName(pid, buf);
dispatch(buf, len);
record(buf, len);
}
void logData(uint16_t pid, int16_t value)
{
char buf[16];
byte n = translatePIDName(pid, buf);
byte len = sprintf_P(buf + n, PSTR("%d"), value) + n;
dispatch(buf, len);
record(buf, len);
}
void logData(uint16_t pid, int32_t value)
{
char buf[20];
byte n = translatePIDName(pid, buf);
byte len = sprintf_P(buf + n, PSTR("%ld"), value) + n;
dispatch(buf, len);
record(buf, len);
}
void logData(uint16_t pid, uint32_t value)
{
char buf[20];
byte n = translatePIDName(pid, buf);
byte len = sprintf_P(buf + n, PSTR("%lu"), value) + n;
dispatch(buf, len);
record(buf, len);
}
void logData(uint16_t pid, int value1, int value2, int value3)
{
char buf[24];
byte n = translatePIDName(pid, buf);
n += sprintf_P(buf + n, PSTR("%d,%d,%d"), value1, value2, value3);
dispatch(buf, n);
record(buf, n);
}
void logCoordinate(uint16_t pid, int32_t value)
{
char buf[24];
byte len = translatePIDName(pid, buf);
len += sprintf_P(buf + len, PSTR("%d.%06lu"), (int)(value / 1000000), abs(value) % 1000000);
dispatch(buf, len);
record(buf, len);
}
#if ENABLE_DATA_LOG
uint16_t openFile(uint32_t dateTime = 0)
{
uint16_t fileIndex;
char path[20] = "/DATA";
dataSize = 0;
if (SD.exists(path)) {
if (dateTime) {
// using date and time as file name
sprintf(path + 5, "/%08lu.CSV", dateTime);
fileIndex = 1;
} else {
// use index number as file name
for (fileIndex = 1; fileIndex; fileIndex++) {
sprintf(path + 5, "/DAT%05u.CSV", fileIndex);
if (!SD.exists(path)) {
break;
}
}
if (fileIndex == 0)
return 0;
}
} else {
SD.mkdir(path);
fileIndex = 1;
sprintf(path + 5, "/DAT%05u.CSV", 1);
}
sdfile = SD.open(path, FILE_WRITE);
if (!sdfile) {
return 0;
}
return fileIndex;
}
void closeFile()
{
sdfile.close();
dataSize = 0;
}
void flushFile()
{
sdfile.flush();
}
#endif
uint32_t dataTime;
uint32_t dataSize;
#if ENABLE_DATA_CACHE
void purgeCache()
{
cacheBytes = 0;
}
char cache[CACHE_SIZE];
int cacheBytes;
#endif
private:
byte translatePIDName(uint16_t pid, char* text)
{
return sprintf_P(text, PSTR("%X,"), pid);
}
uint32_t m_lastDataTime;
};
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