Acurite 06045 add docs, refactor decode out of txr_callback
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rct
Benjamin Larsson
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2e5f2d0afe
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2576d17729
1 changed files with 104 additions and 22 deletions
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@ -328,6 +328,107 @@ static float acurite_6045_getTemp (uint8_t highbyte, uint8_t lowbyte) {
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return temp;
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}
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/*
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* Acurite 06045m Lightning Sensor decoding.
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*
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* Specs:
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* - lightning strike count
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* - extimated distance to front of storm, up to 25 miles / 40 km
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* - Temperature -40 to 158 F / -40 to 70 C
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* - Humidity 1 - 99% RH
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*
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* Status Information sent per 06047M/01021 display
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* - (RF) interference (preventing lightning detection)
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* - low battery
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*
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*
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* Message format
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* --------------
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* Somewhat similar to 592TXR and 5-n-1 weather stations
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* Same pulse characteristics. checksum, and parity checking on data bytes.
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*
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* 0 1 2 3 4 5 6 7 8
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* CI? II II HH ST TT LL DD? KK
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*
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* C = Channel
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* I = ID
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* H = Humidity
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* S = Status/Message type/Temperature MSB.
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* T = Temperature
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* D = Lightning distanace and status bits?
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* L = Lightning strike count.
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* K = Checksum
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*
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* Byte 0 - channel number A/B/C
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* - Channel in 2 most significant bits - A: 0xC, B: 0x8, C: 00
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* - TBD: lower 6 bits, ID or unused?
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*
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* Bytes 1 & 2 - ID, all 8 bits, no parity.
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*
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* Byte 3 - Humidity (7 bits + parity bit)
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*
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* Byte 4 - Status (2 bits) and Temperature MSB (5 bits)
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* - Bitmask PSSTTTTT (P = Parity, S = Status, T = Temperature)
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* - 0x40 - Transmitting every 8 seconds (lightning possibly detected)
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* normal, off, transmits every 24 seconds
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* - 0x20 - TBD: normally off, On is possibly low battery?
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* - 0x1F - Temperature MSB (5 bits)
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*
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* Byte 5 - Temperature LSB (7 bits, 8th is parity)
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*
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* Byte 6 - Lightning Strike count (7 bits, 8th is parity)
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* - Stored in EEPROM or something non-volatile)
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* - Wraps at 127
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*
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* Byte 7 - Lightning Distance (5 bits) and status bits (2 bits) (?)
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* - Bits PSSDDDDD (P = Parity, S = Status, D = Distance
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* - 5 lower bits is distance in unit? (miles? km?) to edge of storm (theory)
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* - Bit 0x20: (RF) interference / strong RFI detected (to be verified)
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* - Bit 0x40: TBD, possible activity?
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* - distance = 0x1f: possible invalid value indication (value at power up)
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* - Note: Distance sometimes goes to 0 right after strike counter increment
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* status bits might indicate validifity of distance.
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*
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* Byte 8 - checksum. 8 bits, no parity.
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*
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* @todo - Get lightning/distance to front of storm to match display
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* @todo - Low battery, figure out encoding
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* @todo - figure out remaining status bits and how to report
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* @todo - convert to data make once decoding is stable
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*/
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static int acurite_6045_decode (bitrow_t bb, int browlen) {
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int valid = 0;
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float tempf;
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uint8_t humidity, message_type, l_status;
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char channel, *wind_dirstr = "";
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char channel_str[2];
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uint16_t sensor_id;
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uint8_t strike_count, strike_distance;
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channel = acurite_getChannel(bb[0]); // same as TXR
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sensor_id = (bb[1] << 8) | bb[2]; // TBD 16 bits or 20?
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humidity = acurite_getHumidity(bb[3]); // same as TXR
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message_type = (bb[4] & 0x60) >> 5; // status bits: 0x2 8 second xmit, 0x1 - TBD batttery?
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tempf = acurite_6045_getTemp(bb[4], bb[5]);
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strike_count = bb[6] & 0x7f;
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strike_distance = bb[7] & 0x1f;
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l_status = (bb[7] & 0x60) >> 5;
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printf("%s Acurite lightning 0x%04X Ch %c Msg Type 0x%02x: %.1f F %d %% RH Strikes %d Distance %d L_status 0x%02x -",
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time_str, sensor_id, channel, message_type, tempf, humidity, strike_count, strike_distance, l_status);
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// FIXME Temporarily dump raw message data until the
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// decoding improves. Includes parity indicator(*).
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for (int i=0; i < browlen; i++) {
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char pc;
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pc = byteParity(bb[i]) == 0 ? ' ' : '*';
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fprintf(stdout, " %02x%c", bb[i], pc);
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}
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printf("\n");
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valid++;
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return(valid);
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}
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/*
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@ -408,7 +509,7 @@ static int acurite_txr_callback(bitbuffer_t *bitbuf) {
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tempc = acurite_txr_getTemp(bb[4], bb[5]);
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sprintf(channel_str, "%c", channel);
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battery_low = sensor_status >>7;
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data = data_make(
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"time", "", DATA_STRING, time_str,
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"model", "", DATA_STRING, "Acurite tower sensor",
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@ -507,27 +608,8 @@ static int acurite_txr_callback(bitbuffer_t *bitbuf) {
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}
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if (browlen == ACURITE_6045_BITLEN / 8) {
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channel = acurite_getChannel(bb[0]); // same as TXR
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sensor_id = (bb[1] << 8) | bb[2]; // TBD 16 bits or 20?
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humidity = acurite_getHumidity(bb[3]); // same as TXR
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message_type = (bb[4] & 0x60) >> 5; // status bits: 0x2 8 second xmit, 0x1 - TBD batttery?
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tempf = acurite_6045_getTemp(bb[4], bb[5]);
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strike_count = bb[6] & 0x7f;
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strike_distance = bb[7] & 0x1f;
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l_status = (bb[7] & 0x60) >> 5;
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printf("%s Acurite lightning 0x%04X Ch %c Msg Type 0x%02x: %.1f F %d %% RH Strikes %d Distance %d L_status 0x%02x -",
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time_str, sensor_id, channel, message_type, tempf, humidity, strike_count, strike_distance, l_status);
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// FIXME Temporarily dump raw message data until the
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// decoding improves. Includes parity indicator(*).
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for (int i=0; i < browlen; i++) {
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char pc;
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pc = byteParity(bb[i]) == 0 ? ' ' : '*';
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fprintf(stdout, " %02x%c", bb[i], pc);
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}
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printf("\n");
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// @todo check parity and reject if invalid
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valid += acurite_6045_decode(bb, browlen);
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}
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}
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