mirror of https://github.com/arendst/Tasmota.git
223 lines
7.3 KiB
C++
223 lines
7.3 KiB
C++
/*
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xsns_35_Tx20.ino - La Crosse Tx20 wind sensor support for Sonoff-Tasmota
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Copyright (C) 2019 Thomas Eckerstorfer and Theo Arends
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef USE_TX20_WIND_SENSOR
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/*********************************************************************************************\
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* La Crosse Tx20 wind sensor
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*
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* based on https://github.com/bunnyhu/ESP8266_TX20_wind_sensor/
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* http://blog.bubux.de/windsensor-tx20-mit-esp8266/
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* https://www.john.geek.nz/2011/07/la-crosse-tx20-anemometer-communication-protocol/
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\*********************************************************************************************/
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#define XSNS_35 35
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#define TX20_BIT_TIME 1220 // microseconds
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#define TX20_RESET_VALUES 60 // seconds
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// The Arduino standard GPIO routines are not enough,
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// must use some from the Espressif SDK as well
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extern "C" {
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#include "gpio.h"
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}
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#ifdef USE_WEBSERVER
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const char HTTP_SNS_TX20[] PROGMEM =
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"{s}TX20 " D_TX20_WIND_SPEED "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
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"{s}TX20 " D_TX20_WIND_SPEED_AVG "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
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"{s}TX20 " D_TX20_WIND_SPEED_MAX "{m}%s " D_UNIT_KILOMETER_PER_HOUR "{e}"
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"{s}TX20 " D_TX20_WIND_DIRECTION "{m}%s{e}";
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#endif // USE_WEBSERVER
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const char kTx20Directions[] PROGMEM = D_TX20_NORTH "|"
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D_TX20_NORTH D_TX20_NORTH D_TX20_EAST "|"
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D_TX20_NORTH D_TX20_EAST "|"
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D_TX20_EAST D_TX20_NORTH D_TX20_EAST "|"
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D_TX20_EAST "|"
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D_TX20_EAST D_TX20_SOUTH D_TX20_EAST "|"
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D_TX20_SOUTH D_TX20_EAST "|"
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D_TX20_SOUTH D_TX20_SOUTH D_TX20_EAST "|"
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D_TX20_SOUTH "|"
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D_TX20_SOUTH D_TX20_SOUTH D_TX20_WEST "|"
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D_TX20_SOUTH D_TX20_WEST "|"
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D_TX20_WEST D_TX20_SOUTH D_TX20_WEST "|"
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D_TX20_WEST "|"
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D_TX20_WEST D_TX20_NORTH D_TX20_WEST "|"
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D_TX20_NORTH D_TX20_WEST "|"
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D_TX20_NORTH D_TX20_NORTH D_TX20_WEST;
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uint8_t tx20_sa = 0;
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uint8_t tx20_sb = 0;
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uint8_t tx20_sd = 0;
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uint8_t tx20_se = 0;
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uint16_t tx20_sc = 0;
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uint16_t tx20_sf = 0;
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float tx20_wind_speed_kmh = 0;
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float tx20_wind_speed_max = 0;
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float tx20_wind_speed_avg = 0;
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float tx20_wind_sum = 0;
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int tx20_count = 0;
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uint8_t tx20_wind_direction = 0;
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bool tx20_available = false;
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void Tx20StartRead(void)
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{
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/* La Crosse TX20 Anemometer datagram every 2 seconds
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* 0-0 11011 0011 111010101111 0101 1100 000101010000 0-0 - Received pin data at 1200 uSec per bit
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* sa sb sc sd se sf
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* 00100 1100 000101010000 1010 1100 000101010000 - sa to sd inverted user data, LSB first
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* sa - Start frame always 00100
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* sb - Wind direction 0 - 15
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* sc - Wind speed 0 - 511
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* sd - Checksum
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* se - Wind direction 0 - 15
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* sf - Wind speed 0 - 511
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*/
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tx20_available = false;
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tx20_sa = 0;
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tx20_sb = 0;
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tx20_sd = 0;
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tx20_se = 0;
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tx20_sc = 0;
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tx20_sf = 0;
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delayMicroseconds(TX20_BIT_TIME / 2);
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for (int bitcount = 41; bitcount > 0; bitcount--) {
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uint8_t dpin = (digitalRead(pin[GPIO_TX20_TXD_BLACK]));
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if (bitcount > 41 - 5) {
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// start, inverted
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tx20_sa = (tx20_sa << 1) | (dpin ^ 1);
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} else if (bitcount > 41 - 5 - 4) {
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// wind dir, inverted
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tx20_sb = tx20_sb >> 1 | ((dpin ^ 1) << 3);
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} else if (bitcount > 41 - 5 - 4 - 12) {
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// windspeed, inverted
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tx20_sc = tx20_sc >> 1 | ((dpin ^ 1) << 11);
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} else if (bitcount > 41 - 5 - 4 - 12 - 4) {
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// checksum, inverted
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tx20_sd = tx20_sd >> 1 | ((dpin ^ 1) << 3);
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} else if (bitcount > 41 - 5 - 4 - 12 - 4 - 4) {
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// wind dir
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tx20_se = tx20_se >> 1 | (dpin << 3);
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} else {
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// windspeed
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tx20_sf = tx20_sf >> 1 | (dpin << 11);
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}
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delayMicroseconds(TX20_BIT_TIME);
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}
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uint8_t chk = (tx20_sb + (tx20_sc & 0xf) + ((tx20_sc >> 4) & 0xf) + ((tx20_sc >> 8) & 0xf));
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chk &= 0xf;
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if ((chk == tx20_sd) && (tx20_sc < 400)) { // if checksum seems to be ok and wind speed below 40 m/s
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tx20_available = true;
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}
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/*
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if ((tx20_sb == tx20_se) && (tx20_sc == tx20_sf) && (tx20_sc < 400)) {
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tx20_available = true;
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}
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*/
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// Must clear this bit in the interrupt register,
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// it gets set even when interrupts are disabled
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GPIO_REG_WRITE(GPIO_STATUS_W1TC_ADDRESS, 1 << pin[GPIO_TX20_TXD_BLACK]);
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}
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void Tx20Read(void)
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{
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if (!(uptime % TX20_RESET_VALUES)) {
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tx20_count = 0;
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tx20_wind_sum = 0;
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tx20_wind_speed_max = 0;
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}
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else if (tx20_available) {
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tx20_wind_speed_kmh = float(tx20_sc) * 0.36;
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if (tx20_wind_speed_kmh > tx20_wind_speed_max) {
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tx20_wind_speed_max = tx20_wind_speed_kmh;
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}
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tx20_count++;
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tx20_wind_sum += tx20_wind_speed_kmh;
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tx20_wind_speed_avg = tx20_wind_sum / tx20_count;
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tx20_wind_direction = tx20_sb;
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}
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}
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void Tx20Init(void) {
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pinMode(pin[GPIO_TX20_TXD_BLACK], INPUT);
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attachInterrupt(pin[GPIO_TX20_TXD_BLACK], Tx20StartRead, RISING);
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}
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void Tx20Show(bool json)
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{
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char wind_speed_string[33];
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dtostrfd(tx20_wind_speed_kmh, 2, wind_speed_string);
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char wind_speed_max_string[33];
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dtostrfd(tx20_wind_speed_max, 2, wind_speed_max_string);
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char wind_speed_avg_string[33];
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dtostrfd(tx20_wind_speed_avg, 2, wind_speed_avg_string);
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char wind_direction_string[4];
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GetTextIndexed(wind_direction_string, sizeof(wind_direction_string), tx20_wind_direction, kTx20Directions);
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if (json) {
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ResponseAppend_P(PSTR(",\"TX20\":{\"Speed\":%s,\"SpeedAvg\":%s,\"SpeedMax\":%s,\"Direction\":\"%s\"}"),
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wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
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#ifdef USE_WEBSERVER
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} else {
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WSContentSend_PD(HTTP_SNS_TX20, wind_speed_string, wind_speed_avg_string, wind_speed_max_string, wind_direction_string);
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#endif // USE_WEBSERVER
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}
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}
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/*********************************************************************************************\
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* Interface
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\*********************************************************************************************/
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bool Xsns35(uint8_t function)
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{
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bool result = false;
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if (pin[GPIO_TX20_TXD_BLACK] < 99) {
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switch (function) {
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case FUNC_INIT:
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Tx20Init();
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break;
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case FUNC_EVERY_SECOND:
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Tx20Read();
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break;
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case FUNC_JSON_APPEND:
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Tx20Show(1);
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break;
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#ifdef USE_WEBSERVER
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case FUNC_WEB_SENSOR:
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Tx20Show(0);
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break;
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#endif // USE_WEBSERVER
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}
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}
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return result;
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}
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#endif // USE_TX20_WIND_SENSOR
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