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419 lines
14 KiB
419 lines
14 KiB
// -----------------------------------------------------------------------------
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// Dallas OneWire Sensor
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// Uses OneWire library
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// Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
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// -----------------------------------------------------------------------------
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#if SENSOR_SUPPORT && DALLAS_SUPPORT
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#pragma once
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#include <OneWire.h>
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#include <vector>
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#include "BaseSensor.h"
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#define DS_CHIP_DS18S20 0x10
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#define DS_CHIP_DS2406 0x12
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#define DS_CHIP_DS1822 0x22
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#define DS_CHIP_DS18B20 0x28
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#define DS_CHIP_DS1825 0x3B
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#define DS_DATA_SIZE 9
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#define DS_PARASITE 1
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#define DS_DISCONNECTED -127
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#define DS_CMD_START_CONVERSION 0x44
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#define DS_CMD_READ_SCRATCHPAD 0xBE
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// ====== DS2406 specific constants =======
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#define DS2406_CHANNEL_ACCESS 0xF5;
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// CHANNEL CONTROL BYTE
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// 7 6 5 4 3 2 1 0
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// ALR IM TOG IC CHS1 CHS0 CRC1 CRC0
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// 0 1 0 0 0 1 0 1 0x45
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// CHS1 CHS0 Description
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// 0 0 (not allowed)
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// 0 1 channel A only
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// 1 0 channel B only
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// 1 1 both channels interleaved
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// TOG IM CHANNELS EFFECT
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// 0 0 one channel Write all bits to the selected channel
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// 0 1 one channel Read all bits from the selected channel
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// 1 0 one channel Write 8 bits, read 8 bits, write, read, etc. to/from the selected channel
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// 1 1 one channel Read 8 bits, write 8 bits, read, write, etc. from/to the selected channel
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// 0 0 two channels Repeat: four times (write A, write B)
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// 0 1 two channels Repeat: four times (read A, read B)
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// 1 0 two channels Four times: (write A, write B), four times: (readA, read B), write, read, etc.
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// 1 1 two channels Four times: (read A, read B), four times: (write A, write B), read, write, etc.
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// CRC1 CRC0 Description
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// 0 0 CRC disabled (no CRC at all)
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// 0 1 CRC after every byte
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// 1 0 CRC after 8 bytes
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// 1 1 CRC after 32 bytes
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#define DS2406_CHANNEL_CONTROL_BYTE 0x45;
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#define DS2406_STATE_BUF_LEN 7
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class DallasSensor : public BaseSensor {
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public:
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// ---------------------------------------------------------------------
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// Public
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// ---------------------------------------------------------------------
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DallasSensor() {
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_sensor_id = SENSOR_DALLAS_ID;
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}
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~DallasSensor() {
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if (_wire) delete _wire;
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gpioUnlock(_gpio);
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}
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// ---------------------------------------------------------------------
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void setGPIO(unsigned char gpio) {
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if (_gpio == gpio) return;
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_gpio = gpio;
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_dirty = true;
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}
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// ---------------------------------------------------------------------
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unsigned char getGPIO() {
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return _gpio;
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}
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// ---------------------------------------------------------------------
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// Sensor API
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// ---------------------------------------------------------------------
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// Initialization method, must be idempotent
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void begin() {
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if (!_dirty) return;
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// Manage GPIO lock
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if (_previous != GPIO_NONE) {
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gpioUnlock(_previous);
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}
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_previous = GPIO_NONE;
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if (!gpioLock(_gpio)) {
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_error = SENSOR_ERROR_GPIO_USED;
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return;
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}
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// OneWire
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if (_wire) delete _wire;
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_wire = new OneWire(_gpio);
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// Search devices
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loadDevices();
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// If no devices found check again pulling up the line
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if (_count == 0) {
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pinMode(_gpio, INPUT_PULLUP);
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loadDevices();
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}
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// Check connection
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if (_count == 0) {
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gpioUnlock(_gpio);
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} else {
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_previous = _gpio;
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}
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_ready = true;
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_dirty = false;
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}
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// Loop-like method, call it in your main loop
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void tick() {
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static unsigned long last = 0;
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if (millis() - last < DALLAS_READ_INTERVAL) return;
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last = millis();
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// Every second we either start a conversion or read the scratchpad
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static bool conversion = true;
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if (conversion) {
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// Start conversion
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_wire->reset();
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_wire->skip();
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_wire->write(DS_CMD_START_CONVERSION, DS_PARASITE);
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} else {
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// Read scratchpads
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for (unsigned char index=0; index<_devices.size(); index++) {
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if (_devices[index].address[0] == DS_CHIP_DS2406) {
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uint8_t data[DS2406_STATE_BUF_LEN];
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// Read scratchpad
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if (_wire->reset() == 0) {
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// Force a CRC check error
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_devices[index].data[0] = _devices[index].data[0] + 1;
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return;
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}
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_wire->select(_devices[index].address);
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data[0] = DS2406_CHANNEL_ACCESS;
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data[1] = DS2406_CHANNEL_CONTROL_BYTE;
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data[2] = 0xFF;
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_wire->write_bytes(data,3);
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// 3 cmd bytes, 1 channel info byte, 1 0x00, 2 CRC16
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for(int i = 3; i<DS2406_STATE_BUF_LEN; i++) {
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data[i] = _wire->read();
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}
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// Read scratchpad
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if (_wire->reset() == 0) {
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// Force a CRC check error
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_devices[index].data[0] = _devices[index].data[0] + 1;
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return;
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}
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memcpy(_devices[index].data, data, DS2406_STATE_BUF_LEN);
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} else {
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// Read scratchpad
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if (_wire->reset() == 0) {
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// Force a CRC check error
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_devices[index].data[0] = _devices[index].data[0] + 1;
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return;
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}
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_wire->select(_devices[index].address);
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_wire->write(DS_CMD_READ_SCRATCHPAD);
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uint8_t data[DS_DATA_SIZE];
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for (unsigned char i = 0; i < DS_DATA_SIZE; i++) {
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data[i] = _wire->read();
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}
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if (_wire->reset() != 1) {
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// Force a CRC check error
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_devices[index].data[0] = _devices[index].data[0] + 1;
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return;
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}
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memcpy(_devices[index].data, data, DS_DATA_SIZE);
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}
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}
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}
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conversion = !conversion;
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}
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// Descriptive name of the sensor
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String description() {
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char buffer[20];
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snprintf(buffer, sizeof(buffer), "Dallas @ GPIO%d", _gpio);
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return String(buffer);
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}
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// Address of the device
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String address(unsigned char index) {
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char buffer[20] = {0};
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if (index < _count) {
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uint8_t * address = _devices[index].address;
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snprintf(buffer, sizeof(buffer), "%02X%02X%02X%02X%02X%02X%02X%02X",
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address[0], address[1], address[2], address[3],
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address[4], address[5], address[6], address[7]
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);
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}
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return String(buffer);
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}
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// Descriptive name of the slot # index
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String description(unsigned char index) {
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if (index < _count) {
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char buffer[40];
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uint8_t * address = _devices[index].address;
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snprintf(buffer, sizeof(buffer), "%s (%02X%02X%02X%02X%02X%02X%02X%02X) @ GPIO%d",
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chipAsString(index).c_str(),
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address[0], address[1], address[2], address[3],
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address[4], address[5], address[6], address[7],
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_gpio
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);
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return String(buffer);
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}
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return String();
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}
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// Type for slot # index
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unsigned char type(unsigned char index) {
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if (index < _count) {
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if (chip(index) == DS_CHIP_DS2406) {
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return MAGNITUDE_DIGITAL;
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} else {
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return MAGNITUDE_TEMPERATURE;
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}
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}
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return MAGNITUDE_NONE;
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}
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// Number of decimals for a magnitude (or -1 for default)
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signed char decimals(sensor::Unit unit) {
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switch (unit) {
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// Smallest increment is 0.0625 C, so 2 decimals
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case sensor::Unit::Celcius:
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return 2;
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// In case we have DS2406, there is no decimal places
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default:
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return 0;
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}
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}
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// Pre-read hook (usually to populate registers with up-to-date data)
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void pre() {
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_error = SENSOR_ERROR_OK;
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}
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// Current value for slot # index
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double value(unsigned char index) {
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if (index >= _count) return 0;
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uint8_t * data = _devices[index].data;
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if (chip(index) == DS_CHIP_DS2406) {
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if (!OneWire::check_crc16(data, 5, &data[5])) {
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_error = SENSOR_ERROR_CRC;
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return 0;
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}
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// 3 cmd bytes, 1 channel info byte, 1 0x00, 2 CRC16
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// CHANNEL INFO BYTE
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// Bit 7 : Supply Indication 0 = no supply
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// Bit 6 : Number of Channels 0 = channel A only
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// Bit 5 : PIO-B Activity Latch
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// Bit 4 : PIO-A Activity Latch
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// Bit 3 : PIO B Sensed Level
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// Bit 2 : PIO A Sensed Level
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// Bit 1 : PIO-B Channel Flip-Flop Q
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// Bit 0 : PIO-A Channel Flip-Flop Q
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return (data[3] & 0x04) != 0;
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}
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if (OneWire::crc8(data, DS_DATA_SIZE-1) != data[DS_DATA_SIZE-1]) {
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_error = SENSOR_ERROR_CRC;
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return 0;
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}
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// Registers
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// byte 0: temperature LSB
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// byte 1: temperature MSB
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// byte 2: high alarm temp
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// byte 3: low alarm temp
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// byte 4: DS18S20: store for crc
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// DS18B20 & DS1822: configuration register
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// byte 5: internal use & crc
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// byte 6: DS18S20: COUNT_REMAIN
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// DS18B20 & DS1822: store for crc
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// byte 7: DS18S20: COUNT_PER_C
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// DS18B20 & DS1822: store for crc
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// byte 8: SCRATCHPAD_CRC
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int16_t raw = (data[1] << 8) | data[0];
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if (chip(index) == DS_CHIP_DS18S20) {
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raw = raw << 3; // 9 bit resolution default
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if (data[7] == 0x10) {
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raw = (raw & 0xFFF0) + 12 - data[6]; // "count remain" gives full 12 bit resolution
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}
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} else {
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byte cfg = (data[4] & 0x60);
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if (cfg == 0x00) raw = raw & ~7; // 9 bit res, 93.75 ms
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else if (cfg == 0x20) raw = raw & ~3; // 10 bit res, 187.5 ms
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else if (cfg == 0x40) raw = raw & ~1; // 11 bit res, 375 ms
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// 12 bit res, 750 ms
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}
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double value = (float) raw / 16.0;
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if (value == DS_DISCONNECTED) {
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_error = SENSOR_ERROR_CRC;
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return 0;
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}
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return value;
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}
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protected:
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// ---------------------------------------------------------------------
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// Protected
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// ---------------------------------------------------------------------
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bool validateID(unsigned char id) {
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return (id == DS_CHIP_DS18S20) || (id == DS_CHIP_DS18B20) || (id == DS_CHIP_DS1822) || (id == DS_CHIP_DS1825) || (id == DS_CHIP_DS2406) ;
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}
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unsigned char chip(unsigned char index) {
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if (index < _count) return _devices[index].address[0];
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return 0;
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}
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String chipAsString(unsigned char index) {
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unsigned char chip_id = chip(index);
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if (chip_id == DS_CHIP_DS18S20) return String("DS18S20");
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if (chip_id == DS_CHIP_DS18B20) return String("DS18B20");
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if (chip_id == DS_CHIP_DS1822) return String("DS1822");
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if (chip_id == DS_CHIP_DS1825) return String("DS1825");
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if (chip_id == DS_CHIP_DS2406) return String("DS2406");
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return String("Unknown");
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}
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void loadDevices() {
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uint8_t address[8];
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_wire->reset();
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_wire->reset_search();
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while (_wire->search(address)) {
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// Check CRC
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if (_wire->crc8(address, 7) == address[7]) {
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// Check ID
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if (validateID(address[0])) {
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ds_device_t device;
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memcpy(device.address, address, 8);
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_devices.push_back(device);
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}
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}
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}
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_count = _devices.size();
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}
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typedef struct {
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uint8_t address[8];
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uint8_t data[DS_DATA_SIZE];
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} ds_device_t;
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std::vector<ds_device_t> _devices;
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unsigned char _gpio = GPIO_NONE;
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unsigned char _previous = GPIO_NONE;
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OneWire * _wire = NULL;
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};
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#endif // SENSOR_SUPPORT && DALLAS_SUPPORT
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