mirror of https://github.com/arendst/Tasmota.git
111 lines
2.7 KiB
C++
111 lines
2.7 KiB
C++
/*
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xsns_78_ezo.ino - EZO modules base class
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Copyright (C) 2020 Christopher Tremblay
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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_I2C
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#if defined(USE_EZOPH) || defined(USE_EZOORP) || defined(USE_EZORTD) || defined(USE_EZOHUM) || defined(USE_EZOEC)
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#define D_EZO_DELAY 300 // Minimum delay for any instruction
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#define D_EZO_MAX_BUF 40 // Maximum response
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const char D_EZO_NAME[] PROGMEM = "EZO";
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// This baseclass provides common functionality for all EZO devices
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struct EZOStruct {
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EZOStruct(uint32_t addr) : valid(0), addr(addr), lastRead(-2000) {}
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void MeasureRequest(void)
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{
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const uint8_t EZOMeasureCmd[2] = {'R', 0};
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if (valid) {
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valid--;
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}
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Wire.beginTransmission(addr);
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Wire.write(EZOMeasureCmd, sizeof(EZOMeasureCmd));
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Wire.endTransmission();
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lastRead = millis();
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}
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void HandleCommand(char *cmd, uint32_t len) const
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{
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// Transmit our command verbatim
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Wire.beginTransmission(addr);
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Wire.write(cmd, len);
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if (Wire.endTransmission() != 0) {
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return;
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}
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// Attempt to read the results
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char data[D_EZO_MAX_BUF];
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for (uint32_t code = 254; code == 254; code = Wire.read()) {
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delay(D_EZO_DELAY);
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Wire.requestFrom(addr, sizeof(data));
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}
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for (uint32_t i = 0; Wire.available() > 0; i++) {
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data[i] = Wire.read();
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}
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ResponseCmndChar((char *)data);
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}
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bool isValid(void)
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{
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return valid;
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}
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virtual void ProcessMeasurement(void);
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virtual void Show(bool json, const char *name);
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protected:
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void ProcessMeasurement(char *const data, const uint32_t len, const uint32_t latency)
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{
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// Wait for the data to arrive first
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const int32_t dur = lastRead + latency - millis();
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// Wait for the last readout to complete (only when commands are issued)
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if (dur > 0) {
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delay(dur);
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}
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Wire.requestFrom(addr, len);
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const char code = Wire.read();
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if (code == 1) {
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for (uint32_t i = 0; (Wire.available() > 0) && (i < len); i++) {
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data[i] = Wire.read();
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}
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valid = SENSOR_MAX_MISS;
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}
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}
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uint8_t valid;
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uint8_t addr;
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uint32_t lastRead;
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};
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#endif // USE_EZO*
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#endif // USE_I2C
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