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Tasmota/tasmota/xsns_05_ds18x20.ino

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/*
xsns_05_ds18x20.ino - DS18x20 temperature sensor support for Tasmota
Copyright (C) 2019 Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifdef USE_DS18x20
/*********************************************************************************************\
* DS18B20 - Temperature - Multiple sensors
\*********************************************************************************************/
#define XSNS_05 5
//#define USE_DS18x20_RECONFIGURE // When sensor is lost keep retrying or re-configure
#define DS18S20_CHIPID 0x10 // +/-0.5C 9-bit
#define DS1822_CHIPID 0x22 // +/-2C 12-bit
#define DS18B20_CHIPID 0x28 // +/-0.5C 12-bit
#define MAX31850_CHIPID 0x3B // +/-0.25C 14-bit
#define W1_SKIP_ROM 0xCC
#define W1_CONVERT_TEMP 0x44
#define W1_WRITE_EEPROM 0x48
#define W1_WRITE_SCRATCHPAD 0x4E
#define W1_READ_SCRATCHPAD 0xBE
#define DS18X20_MAX_SENSORS 8
const char kDs18x20Types[] PROGMEM = "DS18x20|DS18S20|DS1822|DS18B20|MAX31850";
uint8_t ds18x20_chipids[] = { 0, DS18S20_CHIPID, DS1822_CHIPID, DS18B20_CHIPID, MAX31850_CHIPID };
struct DS18X20STRUCT {
uint8_t address[8];
uint8_t index;
uint8_t valid;
float temperature;
} ds18x20_sensor[DS18X20_MAX_SENSORS];
uint8_t ds18x20_sensors = 0;
uint8_t ds18x20_pin = 0;
char ds18x20_types[12];
#ifdef W1_PARASITE_POWER
uint8_t ds18x20_sensor_curr = 0;
unsigned long w1_power_until = 0;
#endif
/*********************************************************************************************\
* Embedded tuned OneWire library
\*********************************************************************************************/
#define W1_MATCH_ROM 0x55
#define W1_SEARCH_ROM 0xF0
uint8_t onewire_last_discrepancy = 0;
uint8_t onewire_last_family_discrepancy = 0;
bool onewire_last_device_flag = false;
unsigned char onewire_rom_id[8] = { 0 };
uint8_t OneWireReset(void)
{
uint8_t retries = 125;
//noInterrupts();
pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor
do {
if (--retries == 0) {
return 0;
}
delayMicroseconds(2);
} while (!digitalRead(ds18x20_pin));
pinMode(ds18x20_pin, OUTPUT);
digitalWrite(ds18x20_pin, LOW);
delayMicroseconds(480);
pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor
delayMicroseconds(70);
uint8_t r = !digitalRead(ds18x20_pin);
//interrupts();
delayMicroseconds(410);
return r;
}
void OneWireWriteBit(uint8_t v)
{
static const uint8_t delay_low[2] = { 65, 10 };
static const uint8_t delay_high[2] = { 5, 55 };
v &= 1;
//noInterrupts();
digitalWrite(ds18x20_pin, LOW);
pinMode(ds18x20_pin, OUTPUT);
delayMicroseconds(delay_low[v]);
digitalWrite(ds18x20_pin, HIGH);
//interrupts();
delayMicroseconds(delay_high[v]);
}
uint8_t OneWireReadBit(void)
{
//noInterrupts();
pinMode(ds18x20_pin, OUTPUT);
digitalWrite(ds18x20_pin, LOW);
delayMicroseconds(3);
pinMode(ds18x20_pin, Settings.flag3.ds18x20_internal_pullup ? INPUT_PULLUP : INPUT); // SetOption74 - Enable internal pullup for single DS18x20 sensor
delayMicroseconds(10);
uint8_t r = digitalRead(ds18x20_pin);
//interrupts();
delayMicroseconds(53);
return r;
}
void OneWireWrite(uint8_t v)
{
for (uint8_t bit_mask = 0x01; bit_mask; bit_mask <<= 1) {
OneWireWriteBit((bit_mask & v) ? 1 : 0);
}
}
uint8_t OneWireRead(void)
{
uint8_t r = 0;
for (uint8_t bit_mask = 0x01; bit_mask; bit_mask <<= 1) {
if (OneWireReadBit()) {
r |= bit_mask;
}
}
return r;
}
void OneWireSelect(const uint8_t rom[8])
{
OneWireWrite(W1_MATCH_ROM);
for (uint32_t i = 0; i < 8; i++) {
OneWireWrite(rom[i]);
}
}
void OneWireResetSearch(void)
{
onewire_last_discrepancy = 0;
onewire_last_device_flag = false;
onewire_last_family_discrepancy = 0;
for (uint32_t i = 0; i < 8; i++) {
onewire_rom_id[i] = 0;
}
}
uint8_t OneWireSearch(uint8_t *newAddr)
{
uint8_t id_bit_number = 1;
uint8_t last_zero = 0;
uint8_t rom_byte_number = 0;
uint8_t search_result = 0;
uint8_t id_bit;
uint8_t cmp_id_bit;
unsigned char rom_byte_mask = 1;
unsigned char search_direction;
if (!onewire_last_device_flag) {
if (!OneWireReset()) {
onewire_last_discrepancy = 0;
onewire_last_device_flag = false;
onewire_last_family_discrepancy = 0;
return false;
}
OneWireWrite(W1_SEARCH_ROM);
do {
id_bit = OneWireReadBit();
cmp_id_bit = OneWireReadBit();
if ((id_bit == 1) && (cmp_id_bit == 1)) {
break;
} else {
if (id_bit != cmp_id_bit) {
search_direction = id_bit;
} else {
if (id_bit_number < onewire_last_discrepancy) {
search_direction = ((onewire_rom_id[rom_byte_number] & rom_byte_mask) > 0);
} else {
search_direction = (id_bit_number == onewire_last_discrepancy);
}
if (search_direction == 0) {
last_zero = id_bit_number;
if (last_zero < 9) {
onewire_last_family_discrepancy = last_zero;
}
}
}
if (search_direction == 1) {
onewire_rom_id[rom_byte_number] |= rom_byte_mask;
} else {
onewire_rom_id[rom_byte_number] &= ~rom_byte_mask;
}
OneWireWriteBit(search_direction);
id_bit_number++;
rom_byte_mask <<= 1;
if (rom_byte_mask == 0) {
rom_byte_number++;
rom_byte_mask = 1;
}
}
} while (rom_byte_number < 8);
if (!(id_bit_number < 65)) {
onewire_last_discrepancy = last_zero;
if (onewire_last_discrepancy == 0) {
onewire_last_device_flag = true;
}
search_result = true;
}
}
if (!search_result || !onewire_rom_id[0]) {
onewire_last_discrepancy = 0;
onewire_last_device_flag = false;
onewire_last_family_discrepancy = 0;
search_result = false;
}
for (uint32_t i = 0; i < 8; i++) {
newAddr[i] = onewire_rom_id[i];
}
return search_result;
}
bool OneWireCrc8(uint8_t *addr)
{
uint8_t crc = 0;
uint8_t len = 8;
while (len--) {
uint8_t inbyte = *addr++; // from 0 to 7
for (uint32_t i = 8; i; i--) {
uint8_t mix = (crc ^ inbyte) & 0x01;
crc >>= 1;
if (mix) {
crc ^= 0x8C;
}
inbyte >>= 1;
}
}
return (crc == *addr); // addr 8
}
/********************************************************************************************/
void Ds18x20Init(void)
{
uint64_t ids[DS18X20_MAX_SENSORS];
ds18x20_pin = pin[GPIO_DSB];
OneWireResetSearch();
ds18x20_sensors = 0;
while (ds18x20_sensors < DS18X20_MAX_SENSORS) {
if (!OneWireSearch(ds18x20_sensor[ds18x20_sensors].address)) {
break;
}
if (OneWireCrc8(ds18x20_sensor[ds18x20_sensors].address) &&
((ds18x20_sensor[ds18x20_sensors].address[0] == DS18S20_CHIPID) ||
(ds18x20_sensor[ds18x20_sensors].address[0] == DS1822_CHIPID) ||
(ds18x20_sensor[ds18x20_sensors].address[0] == DS18B20_CHIPID) ||
(ds18x20_sensor[ds18x20_sensors].address[0] == MAX31850_CHIPID))) {
ds18x20_sensor[ds18x20_sensors].index = ds18x20_sensors;
ids[ds18x20_sensors] = ds18x20_sensor[ds18x20_sensors].address[0]; // Chip id
for (uint32_t j = 6; j > 0; j--) {
ids[ds18x20_sensors] = ids[ds18x20_sensors] << 8 | ds18x20_sensor[ds18x20_sensors].address[j];
}
ds18x20_sensors++;
}
}
for (uint32_t i = 0; i < ds18x20_sensors; i++) {
for (uint32_t j = i + 1; j < ds18x20_sensors; j++) {
if (ids[ds18x20_sensor[i].index] > ids[ds18x20_sensor[j].index]) { // Sort ascending
std::swap(ds18x20_sensor[i].index, ds18x20_sensor[j].index);
}
}
}
AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_DSB D_SENSORS_FOUND " %d"), ds18x20_sensors);
}
void Ds18x20Convert(void)
{
OneWireReset();
#ifdef W1_PARASITE_POWER
// With parasite power address one sensor at a time
if (++ds18x20_sensor_curr >= ds18x20_sensors)
ds18x20_sensor_curr = 0;
OneWireSelect(ds18x20_sensor[ds18x20_sensor_curr].address);
#else
OneWireWrite(W1_SKIP_ROM); // Address all Sensors on Bus
#endif
OneWireWrite(W1_CONVERT_TEMP); // start conversion, no parasite power on at the end
// delay(750); // 750ms should be enough for 12bit conv
}
bool Ds18x20Read(uint8_t sensor)
{
uint8_t data[9];
int8_t sign = 1;
uint8_t index = ds18x20_sensor[sensor].index;
if (ds18x20_sensor[index].valid) { ds18x20_sensor[index].valid--; }
for (uint32_t retry = 0; retry < 3; retry++) {
OneWireReset();
OneWireSelect(ds18x20_sensor[index].address);
OneWireWrite(W1_READ_SCRATCHPAD);
for (uint32_t i = 0; i < 9; i++) {
data[i] = OneWireRead();
}
if (OneWireCrc8(data)) {
switch(ds18x20_sensor[index].address[0]) {
case DS18S20_CHIPID: {
if (data[1] > 0x80) {
data[0] = (~data[0]) +1;
sign = -1; // App-Note fix possible sign error
}
float temp9 = (float)(data[0] >> 1) * sign;
ds18x20_sensor[index].temperature = ConvertTemp((temp9 - 0.25) + ((16.0 - data[6]) / 16.0));
ds18x20_sensor[index].valid = SENSOR_MAX_MISS;
return true;
}
case DS1822_CHIPID:
case DS18B20_CHIPID: {
if (data[4] != 0x7F) {
data[4] = 0x7F; // Set resolution to 12-bit
OneWireReset();
OneWireSelect(ds18x20_sensor[index].address);
OneWireWrite(W1_WRITE_SCRATCHPAD);
OneWireWrite(data[2]); // Th Register
OneWireWrite(data[3]); // Tl Register
OneWireWrite(data[4]); // Configuration Register
OneWireSelect(ds18x20_sensor[index].address);
OneWireWrite(W1_WRITE_EEPROM); // Save scratchpad to EEPROM
#ifdef W1_PARASITE_POWER
w1_power_until = millis() + 10; // 10ms specified duration for EEPROM write
#endif
}
uint16_t temp12 = (data[1] << 8) + data[0];
if (temp12 > 2047) {
temp12 = (~temp12) +1;
sign = -1;
}
ds18x20_sensor[index].temperature = ConvertTemp(sign * temp12 * 0.0625); // Divide by 16
ds18x20_sensor[index].valid = SENSOR_MAX_MISS;
return true;
}
case MAX31850_CHIPID: {
int16_t temp14 = (data[1] << 8) + (data[0] & 0xFC);
ds18x20_sensor[index].temperature = ConvertTemp(temp14 * 0.0625); // Divide by 16
ds18x20_sensor[index].valid = SENSOR_MAX_MISS;
return true;
}
}
}
}
AddLog_P(LOG_LEVEL_DEBUG, PSTR(D_LOG_DSB D_SENSOR_CRC_ERROR));
return false;
}
void Ds18x20Name(uint8_t sensor)
{
uint8_t index = sizeof(ds18x20_chipids);
while (index) {
if (ds18x20_sensor[ds18x20_sensor[sensor].index].address[0] == ds18x20_chipids[index]) {
break;
}
index--;
}
GetTextIndexed(ds18x20_types, sizeof(ds18x20_types), index, kDs18x20Types);
if (ds18x20_sensors > 1) {
snprintf_P(ds18x20_types, sizeof(ds18x20_types), PSTR("%s%c%d"), ds18x20_types, IndexSeparator(), sensor +1);
}
}
/********************************************************************************************/
void Ds18x20EverySecond(void)
{
#ifdef W1_PARASITE_POWER
// skip access if there is still an eeprom write ongoing
unsigned long now = millis();
if (now < w1_power_until)
return;
#endif
if (uptime & 1
#ifdef W1_PARASITE_POWER
// if more than 1 sensor and only parasite power: convert every cycle
|| ds18x20_sensors >= 2
#endif
) {
// 2mS
Ds18x20Convert(); // Start conversion, takes up to one second
} else {
for (uint32_t i = 0; i < ds18x20_sensors; i++) {
// 12mS per device
if (!Ds18x20Read(i)) { // Read temperature
Ds18x20Name(i);
AddLogMissed(ds18x20_types, ds18x20_sensor[ds18x20_sensor[i].index].valid);
#ifdef USE_DS18x20_RECONFIGURE
if (!ds18x20_sensor[ds18x20_sensor[i].index].valid) {
memset(&ds18x20_sensor, 0, sizeof(ds18x20_sensor));
Ds18x20Init(); // Re-configure
}
#endif // USE_DS18x20_RECONFIGURE
}
}
}
}
void Ds18x20Show(bool json)
{
for (uint32_t i = 0; i < ds18x20_sensors; i++) {
uint8_t index = ds18x20_sensor[i].index;
if (ds18x20_sensor[index].valid) { // Check for valid temperature
char temperature[33];
dtostrfd(ds18x20_sensor[index].temperature, Settings.flag2.temperature_resolution, temperature);
Ds18x20Name(i);
if (json) {
char address[17];
for (uint32_t j = 0; j < 6; j++) {
sprintf(address+2*j, "%02X", ds18x20_sensor[index].address[6-j]); // Skip sensor type and crc
}
ResponseAppend_P(PSTR(",\"%s\":{\"" D_JSON_ID "\":\"%s\",\"" D_JSON_TEMPERATURE "\":%s}"), ds18x20_types, address, temperature);
#ifdef USE_DOMOTICZ
if ((0 == tele_period) && (0 == i)) {
DomoticzSensor(DZ_TEMP, temperature);
}
#endif // USE_DOMOTICZ
#ifdef USE_KNX
if ((0 == tele_period) && (0 == i)) {
KnxSensor(KNX_TEMPERATURE, ds18x20_sensor[index].temperature);
}
#endif // USE_KNX
#ifdef USE_WEBSERVER
} else {
WSContentSend_PD(HTTP_SNS_TEMP, ds18x20_types, temperature, TempUnit());
#endif // USE_WEBSERVER
}
}
}
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xsns05(uint8_t function)
{
bool result = false;
if (pin[GPIO_DSB] < 99) {
switch (function) {
case FUNC_INIT:
Ds18x20Init();
break;
case FUNC_EVERY_SECOND:
Ds18x20EverySecond();
break;
case FUNC_JSON_APPEND:
Ds18x20Show(1);
break;
#ifdef USE_WEBSERVER
case FUNC_WEB_SENSOR:
Ds18x20Show(0);
break;
#endif // USE_WEBSERVER
}
}
return result;
}
#endif // USE_DS18x20
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