mirror of https://github.com/arendst/Tasmota.git
257 lines
11 KiB
C++
257 lines
11 KiB
C++
/*
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xsns_12_ads1115_ada.ino - ADS1115 A/D Converter support for Tasmota
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Copyright (C) 2019 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_I2C
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#ifdef USE_ADS1115
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/*********************************************************************************************\
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* ADS1115 - 4 channel 16BIT A/D converter
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*
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* Required library: none but based on Adafruit Industries ADS1015 library
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*
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* I2C Address: 0x48, 0x49, 0x4A or 0x4B
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*
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* The ADC input range (or gain) can be changed via the following
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* defines, but be careful never to exceed VDD +0.3V max, or to
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* exceed the upper and lower limits if you adjust the input range!
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* Setting these values incorrectly may destroy your ADC!
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* ADS1115
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* -------
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* ADS1115_REG_CONFIG_PGA_6_144V // 2/3x gain +/- 6.144V 1 bit = 0.1875mV (default)
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* ADS1115_REG_CONFIG_PGA_4_096V // 1x gain +/- 4.096V 1 bit = 0.125mV
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* ADS1115_REG_CONFIG_PGA_2_048V // 2x gain +/- 2.048V 1 bit = 0.0625mV
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* ADS1115_REG_CONFIG_PGA_1_024V // 4x gain +/- 1.024V 1 bit = 0.03125mV
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* ADS1115_REG_CONFIG_PGA_0_512V // 8x gain +/- 0.512V 1 bit = 0.015625mV
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* ADS1115_REG_CONFIG_PGA_0_256V // 16x gain +/- 0.256V 1 bit = 0.0078125mV
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\*********************************************************************************************/
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#define XSNS_12 12
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#define XI2C_13 13 // See I2CDEVICES.md
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#define ADS1115_ADDRESS_ADDR_GND 0x48 // address pin low (GND)
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#define ADS1115_ADDRESS_ADDR_VDD 0x49 // address pin high (VCC)
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#define ADS1115_ADDRESS_ADDR_SDA 0x4A // address pin tied to SDA pin
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#define ADS1115_ADDRESS_ADDR_SCL 0x4B // address pin tied to SCL pin
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#define ADS1115_CONVERSIONDELAY (8) // CONVERSION DELAY (in mS)
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/*======================================================================
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POINTER REGISTER
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-----------------------------------------------------------------------*/
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#define ADS1115_REG_POINTER_MASK (0x03)
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#define ADS1115_REG_POINTER_CONVERT (0x00)
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#define ADS1115_REG_POINTER_CONFIG (0x01)
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#define ADS1115_REG_POINTER_LOWTHRESH (0x02)
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#define ADS1115_REG_POINTER_HITHRESH (0x03)
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/*======================================================================
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CONFIG REGISTER
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-----------------------------------------------------------------------*/
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#define ADS1115_REG_CONFIG_OS_MASK (0x8000)
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#define ADS1115_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
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#define ADS1115_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
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#define ADS1115_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
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#define ADS1115_REG_CONFIG_MUX_MASK (0x7000)
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#define ADS1115_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
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#define ADS1115_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
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#define ADS1115_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
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#define ADS1115_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
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#define ADS1115_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
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#define ADS1115_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
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#define ADS1115_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
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#define ADS1115_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
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#define ADS1115_REG_CONFIG_PGA_MASK (0x0E00)
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#define ADS1115_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3 (default)
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#define ADS1115_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
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#define ADS1115_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2
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#define ADS1115_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
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#define ADS1115_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
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#define ADS1115_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
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#define ADS1115_REG_CONFIG_MODE_MASK (0x0100)
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#define ADS1115_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
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#define ADS1115_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
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#define ADS1115_REG_CONFIG_DR_MASK (0x00E0)
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#define ADS1115_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second
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#define ADS1115_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second
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#define ADS1115_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second
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#define ADS1115_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second
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#define ADS1115_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)
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#define ADS1115_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second
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#define ADS1115_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second
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#define ADS1115_REG_CONFIG_DR_6000SPS (0x00E0) // 6000 samples per second
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#define ADS1115_REG_CONFIG_CMODE_MASK (0x0010)
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#define ADS1115_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
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#define ADS1115_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
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#define ADS1115_REG_CONFIG_CPOL_MASK (0x0008)
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#define ADS1115_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
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#define ADS1115_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
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#define ADS1115_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
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#define ADS1115_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
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#define ADS1115_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
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#define ADS1115_REG_CONFIG_CQUE_MASK (0x0003)
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#define ADS1115_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
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#define ADS1115_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
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#define ADS1115_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
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#define ADS1115_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
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struct ADS1115 {
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uint8_t count = 0;
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uint8_t address;
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uint8_t addresses[4] = { ADS1115_ADDRESS_ADDR_GND, ADS1115_ADDRESS_ADDR_VDD, ADS1115_ADDRESS_ADDR_SDA, ADS1115_ADDRESS_ADDR_SCL };
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uint8_t found[4] = {false,false,false,false};
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} Ads1115;
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//Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_SINGLE);
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//Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_CONTIN);
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void Ads1115StartComparator(uint8_t channel, uint16_t mode)
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{
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// Start with default values
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uint16_t config = mode |
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ADS1115_REG_CONFIG_CQUE_NONE | // Comparator enabled and asserts on 1 match
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ADS1115_REG_CONFIG_CLAT_NONLAT | // Non Latching mode
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ADS1115_REG_CONFIG_PGA_6_144V | // ADC Input voltage range (Gain)
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ADS1115_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val)
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ADS1115_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val)
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ADS1115_REG_CONFIG_DR_6000SPS; // 6000 samples per second
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// Set single-ended input channel
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config |= (ADS1115_REG_CONFIG_MUX_SINGLE_0 + (0x1000 * channel));
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// Write config register to the ADC
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I2cWrite16(Ads1115.address, ADS1115_REG_POINTER_CONFIG, config);
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}
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int16_t Ads1115GetConversion(uint8_t channel)
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{
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Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_SINGLE);
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// Wait for the conversion to complete
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delay(ADS1115_CONVERSIONDELAY);
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// Read the conversion results
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I2cRead16(Ads1115.address, ADS1115_REG_POINTER_CONVERT);
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Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_CONTIN);
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delay(ADS1115_CONVERSIONDELAY);
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// Read the conversion results
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uint16_t res = I2cRead16(Ads1115.address, ADS1115_REG_POINTER_CONVERT);
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return (int16_t)res;
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}
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/********************************************************************************************/
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void Ads1115Detect(void)
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{
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if (Ads1115.count) { return; }
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for (uint32_t i = 0; i < sizeof(Ads1115.addresses); i++) {
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if (!Ads1115.found[i]) {
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Ads1115.address = Ads1115.addresses[i];
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if (I2cActive(Ads1115.address)) { continue; }
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uint16_t buffer;
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if (I2cValidRead16(&buffer, Ads1115.address, ADS1115_REG_POINTER_CONVERT) &&
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I2cValidRead16(&buffer, Ads1115.address, ADS1115_REG_POINTER_CONFIG)) {
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Ads1115StartComparator(i, ADS1115_REG_CONFIG_MODE_CONTIN);
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Ads1115.count++;
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Ads1115.found[i] = 1;
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I2cSetActiveFound(Ads1115.address, "ADS1115");
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}
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}
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}
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}
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void Ads1115Show(bool json)
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{
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if (!Ads1115.count) { return; }
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int16_t values[4];
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for (uint32_t t = 0; t < sizeof(Ads1115.addresses); t++) {
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//AddLog_P2(LOG_LEVEL_INFO, "Logging ADS1115 %02x", Ads1115.addresses[t]);
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if (Ads1115.found[t]) {
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uint8_t old_address = Ads1115.address;
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Ads1115.address = Ads1115.addresses[t];
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for (uint32_t i = 0; i < 4; i++) {
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values[i] = Ads1115GetConversion(i);
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//AddLog_P2(LOG_LEVEL_INFO, "Logging ADS1115 %02x (%i) = %i", address, i, values[i] );
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}
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Ads1115.address = old_address;
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char label[15];
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if (1 == Ads1115.count) {
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// "ADS1115":{"A0":3240,"A1":3235,"A2":3269,"A3":3269}
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snprintf_P(label, sizeof(label), PSTR("ADS1115"));
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} else {
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// "ADS1115-48":{"A0":3240,"A1":3235,"A2":3269,"A3":3269},"ADS1115-49":{"A0":3240,"A1":3235,"A2":3269,"A3":3269}
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snprintf_P(label, sizeof(label), PSTR("ADS1115%c%02x"), IndexSeparator(), Ads1115.addresses[t]);
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}
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if (json) {
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ResponseAppend_P(PSTR(",\"%s\":{"), label);
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for (uint32_t i = 0; i < 4; i++) {
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ResponseAppend_P(PSTR("%s\"A%d\":%d"), (0 == i) ? "" : ",", i, values[i]);
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}
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ResponseJsonEnd();
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}
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#ifdef USE_WEBSERVER
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else {
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for (uint32_t i = 0; i < 4; i++) {
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WSContentSend_PD(HTTP_SNS_ANALOG, label, i, values[i]);
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}
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}
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#endif // USE_WEBSERVER
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}
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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 Xsns12(uint8_t function)
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{
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if (!I2cEnabled(XI2C_13)) { return false; }
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bool result = false;
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switch (function) {
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case FUNC_JSON_APPEND:
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Ads1115Show(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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Ads1115Show(0);
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break;
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#endif // USE_WEBSERVER
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case FUNC_INIT:
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Ads1115Detect();
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break;
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}
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return result;
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}
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#endif // USE_ADS1115
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#endif // USE_I2C
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