mirror of https://github.com/arendst/Tasmota.git
266 lines
11 KiB
C++
266 lines
11 KiB
C++
/*
|
|
xsns_12_ads1115_ada.ino - ADS1115 A/D Converter support for Sonoff-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_I2C
|
|
#ifdef USE_ADS1115
|
|
/*********************************************************************************************\
|
|
* ADS1115 - 4 channel 16BIT A/D converter
|
|
*
|
|
* Required library: none but based on Adafruit Industries ADS1015 library
|
|
*
|
|
* I2C Address: 0x48, 0x49, 0x4A or 0x4B
|
|
*
|
|
* The ADC input range (or gain) can be changed via the following
|
|
* defines, but be careful never to exceed VDD +0.3V max, or to
|
|
* exceed the upper and lower limits if you adjust the input range!
|
|
* Setting these values incorrectly may destroy your ADC!
|
|
* ADS1115
|
|
* -------
|
|
* ADS1115_REG_CONFIG_PGA_6_144V // 2/3x gain +/- 6.144V 1 bit = 0.1875mV (default)
|
|
* ADS1115_REG_CONFIG_PGA_4_096V // 1x gain +/- 4.096V 1 bit = 0.125mV
|
|
* ADS1115_REG_CONFIG_PGA_2_048V // 2x gain +/- 2.048V 1 bit = 0.0625mV
|
|
* ADS1115_REG_CONFIG_PGA_1_024V // 4x gain +/- 1.024V 1 bit = 0.03125mV
|
|
* ADS1115_REG_CONFIG_PGA_0_512V // 8x gain +/- 0.512V 1 bit = 0.015625mV
|
|
* ADS1115_REG_CONFIG_PGA_0_256V // 16x gain +/- 0.256V 1 bit = 0.0078125mV
|
|
\*********************************************************************************************/
|
|
|
|
#define XSNS_12 12
|
|
|
|
#define ADS1115_ADDRESS_ADDR_GND 0x48 // address pin low (GND)
|
|
#define ADS1115_ADDRESS_ADDR_VDD 0x49 // address pin high (VCC)
|
|
#define ADS1115_ADDRESS_ADDR_SDA 0x4A // address pin tied to SDA pin
|
|
#define ADS1115_ADDRESS_ADDR_SCL 0x4B // address pin tied to SCL pin
|
|
|
|
#define ADS1115_CONVERSIONDELAY (8) // CONVERSION DELAY (in mS)
|
|
|
|
/*======================================================================
|
|
POINTER REGISTER
|
|
-----------------------------------------------------------------------*/
|
|
#define ADS1115_REG_POINTER_MASK (0x03)
|
|
#define ADS1115_REG_POINTER_CONVERT (0x00)
|
|
#define ADS1115_REG_POINTER_CONFIG (0x01)
|
|
#define ADS1115_REG_POINTER_LOWTHRESH (0x02)
|
|
#define ADS1115_REG_POINTER_HITHRESH (0x03)
|
|
|
|
/*======================================================================
|
|
CONFIG REGISTER
|
|
-----------------------------------------------------------------------*/
|
|
#define ADS1115_REG_CONFIG_OS_MASK (0x8000)
|
|
#define ADS1115_REG_CONFIG_OS_SINGLE (0x8000) // Write: Set to start a single-conversion
|
|
#define ADS1115_REG_CONFIG_OS_BUSY (0x0000) // Read: Bit = 0 when conversion is in progress
|
|
#define ADS1115_REG_CONFIG_OS_NOTBUSY (0x8000) // Read: Bit = 1 when device is not performing a conversion
|
|
|
|
#define ADS1115_REG_CONFIG_MUX_MASK (0x7000)
|
|
#define ADS1115_REG_CONFIG_MUX_DIFF_0_1 (0x0000) // Differential P = AIN0, N = AIN1 (default)
|
|
#define ADS1115_REG_CONFIG_MUX_DIFF_0_3 (0x1000) // Differential P = AIN0, N = AIN3
|
|
#define ADS1115_REG_CONFIG_MUX_DIFF_1_3 (0x2000) // Differential P = AIN1, N = AIN3
|
|
#define ADS1115_REG_CONFIG_MUX_DIFF_2_3 (0x3000) // Differential P = AIN2, N = AIN3
|
|
#define ADS1115_REG_CONFIG_MUX_SINGLE_0 (0x4000) // Single-ended AIN0
|
|
#define ADS1115_REG_CONFIG_MUX_SINGLE_1 (0x5000) // Single-ended AIN1
|
|
#define ADS1115_REG_CONFIG_MUX_SINGLE_2 (0x6000) // Single-ended AIN2
|
|
#define ADS1115_REG_CONFIG_MUX_SINGLE_3 (0x7000) // Single-ended AIN3
|
|
|
|
#define ADS1115_REG_CONFIG_PGA_MASK (0x0E00)
|
|
#define ADS1115_REG_CONFIG_PGA_6_144V (0x0000) // +/-6.144V range = Gain 2/3 (default)
|
|
#define ADS1115_REG_CONFIG_PGA_4_096V (0x0200) // +/-4.096V range = Gain 1
|
|
#define ADS1115_REG_CONFIG_PGA_2_048V (0x0400) // +/-2.048V range = Gain 2
|
|
#define ADS1115_REG_CONFIG_PGA_1_024V (0x0600) // +/-1.024V range = Gain 4
|
|
#define ADS1115_REG_CONFIG_PGA_0_512V (0x0800) // +/-0.512V range = Gain 8
|
|
#define ADS1115_REG_CONFIG_PGA_0_256V (0x0A00) // +/-0.256V range = Gain 16
|
|
|
|
#define ADS1115_REG_CONFIG_MODE_MASK (0x0100)
|
|
#define ADS1115_REG_CONFIG_MODE_CONTIN (0x0000) // Continuous conversion mode
|
|
#define ADS1115_REG_CONFIG_MODE_SINGLE (0x0100) // Power-down single-shot mode (default)
|
|
|
|
#define ADS1115_REG_CONFIG_DR_MASK (0x00E0)
|
|
#define ADS1115_REG_CONFIG_DR_128SPS (0x0000) // 128 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_250SPS (0x0020) // 250 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_490SPS (0x0040) // 490 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_920SPS (0x0060) // 920 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_1600SPS (0x0080) // 1600 samples per second (default)
|
|
#define ADS1115_REG_CONFIG_DR_2400SPS (0x00A0) // 2400 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_3300SPS (0x00C0) // 3300 samples per second
|
|
#define ADS1115_REG_CONFIG_DR_6000SPS (0x00E0) // 6000 samples per second
|
|
|
|
#define ADS1115_REG_CONFIG_CMODE_MASK (0x0010)
|
|
#define ADS1115_REG_CONFIG_CMODE_TRAD (0x0000) // Traditional comparator with hysteresis (default)
|
|
#define ADS1115_REG_CONFIG_CMODE_WINDOW (0x0010) // Window comparator
|
|
|
|
#define ADS1115_REG_CONFIG_CPOL_MASK (0x0008)
|
|
#define ADS1115_REG_CONFIG_CPOL_ACTVLOW (0x0000) // ALERT/RDY pin is low when active (default)
|
|
#define ADS1115_REG_CONFIG_CPOL_ACTVHI (0x0008) // ALERT/RDY pin is high when active
|
|
|
|
#define ADS1115_REG_CONFIG_CLAT_MASK (0x0004) // Determines if ALERT/RDY pin latches once asserted
|
|
#define ADS1115_REG_CONFIG_CLAT_NONLAT (0x0000) // Non-latching comparator (default)
|
|
#define ADS1115_REG_CONFIG_CLAT_LATCH (0x0004) // Latching comparator
|
|
|
|
#define ADS1115_REG_CONFIG_CQUE_MASK (0x0003)
|
|
#define ADS1115_REG_CONFIG_CQUE_1CONV (0x0000) // Assert ALERT/RDY after one conversions
|
|
#define ADS1115_REG_CONFIG_CQUE_2CONV (0x0001) // Assert ALERT/RDY after two conversions
|
|
#define ADS1115_REG_CONFIG_CQUE_4CONV (0x0002) // Assert ALERT/RDY after four conversions
|
|
#define ADS1115_REG_CONFIG_CQUE_NONE (0x0003) // Disable the comparator and put ALERT/RDY in high state (default)
|
|
|
|
uint8_t ads1115_type = 0;
|
|
uint8_t ads1115_address;
|
|
uint8_t ads1115_addresses[] = { ADS1115_ADDRESS_ADDR_GND, ADS1115_ADDRESS_ADDR_VDD, ADS1115_ADDRESS_ADDR_SDA, ADS1115_ADDRESS_ADDR_SCL };
|
|
uint8_t ads1115_found[] = {false,false,false,false};
|
|
int16_t ads1115_values[4];
|
|
//Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_SINGLE);
|
|
//Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_CONTIN);
|
|
void Ads1115StartComparator(uint8_t channel, uint16_t mode)
|
|
{
|
|
// Start with default values
|
|
uint16_t config = mode |
|
|
ADS1115_REG_CONFIG_CQUE_NONE | // Comparator enabled and asserts on 1 match
|
|
ADS1115_REG_CONFIG_CLAT_NONLAT | // Non Latching mode
|
|
ADS1115_REG_CONFIG_PGA_6_144V | // ADC Input voltage range (Gain)
|
|
ADS1115_REG_CONFIG_CPOL_ACTVLOW | // Alert/Rdy active low (default val)
|
|
ADS1115_REG_CONFIG_CMODE_TRAD | // Traditional comparator (default val)
|
|
ADS1115_REG_CONFIG_DR_6000SPS; // 6000 samples per second
|
|
|
|
// Set single-ended input channel
|
|
config |= (ADS1115_REG_CONFIG_MUX_SINGLE_0 + (0x1000 * channel));
|
|
|
|
// Write config register to the ADC
|
|
I2cWrite16(ads1115_address, ADS1115_REG_POINTER_CONFIG, config);
|
|
}
|
|
|
|
int16_t Ads1115GetConversion(uint8_t channel)
|
|
{
|
|
Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_SINGLE);
|
|
// Wait for the conversion to complete
|
|
delay(ADS1115_CONVERSIONDELAY);
|
|
// Read the conversion results
|
|
I2cRead16(ads1115_address, ADS1115_REG_POINTER_CONVERT);
|
|
|
|
Ads1115StartComparator(channel, ADS1115_REG_CONFIG_MODE_CONTIN);
|
|
delay(ADS1115_CONVERSIONDELAY);
|
|
// Read the conversion results
|
|
uint16_t res = I2cRead16(ads1115_address, ADS1115_REG_POINTER_CONVERT);
|
|
return (int16_t)res;
|
|
}
|
|
|
|
/********************************************************************************************/
|
|
|
|
void Ads1115Detect(void)
|
|
{
|
|
uint16_t buffer;
|
|
for (uint8_t i = 0; i < sizeof(ads1115_addresses); i++) {
|
|
if (!ads1115_found[i]) {
|
|
ads1115_address = ads1115_addresses[i];
|
|
if (I2cValidRead16(&buffer, ads1115_address, ADS1115_REG_POINTER_CONVERT) &&
|
|
I2cValidRead16(&buffer, ads1115_address, ADS1115_REG_POINTER_CONFIG)) {
|
|
Ads1115StartComparator(i, ADS1115_REG_CONFIG_MODE_CONTIN);
|
|
ads1115_type = 1;
|
|
ads1115_found[i] = 1;
|
|
AddLog_P2(LOG_LEVEL_DEBUG, S_LOG_I2C_FOUND_AT, "ADS1115", ads1115_address);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Ads1115GetValues(uint8_t address)
|
|
{
|
|
uint8_t old_address = ads1115_address;
|
|
ads1115_address = address;
|
|
for (uint8_t i = 0; i < 4; i++) {
|
|
ads1115_values[i] = Ads1115GetConversion(i);
|
|
//AddLog_P2(LOG_LEVEL_INFO, "Logging ADS1115 %02x (%i) = %i", address, i, ads1115_values[i] );
|
|
}
|
|
ads1115_address = old_address;
|
|
}
|
|
|
|
void Ads1115toJSON(char *comma_j)
|
|
{
|
|
ResponseAppend_P(PSTR("%s{"), comma_j);
|
|
char *comma = (char*)"";
|
|
for (uint8_t i = 0; i < 4; i++) {
|
|
ResponseAppend_P(PSTR("%s\"A%d\":%d"), comma, i, ads1115_values[i]);
|
|
comma = (char*)",";
|
|
}
|
|
ResponseAppend_P(PSTR("}"));
|
|
}
|
|
|
|
void Ads1115toString(uint8_t address)
|
|
{
|
|
char label[15];
|
|
snprintf_P(label, sizeof(label), "ADS1115(%02x)", address);
|
|
|
|
for (uint8_t i = 0; i < 4; i++) {
|
|
WSContentSend_PD(HTTP_SNS_ANALOG, label, i, ads1115_values[i]);
|
|
}
|
|
}
|
|
|
|
void Ads1115Show(bool json)
|
|
{
|
|
if (!ads1115_type) { return; }
|
|
|
|
if (json) {
|
|
ResponseAppend_P(PSTR(",\"ADS1115\":"));
|
|
}
|
|
|
|
char *comma = (char*)"";
|
|
|
|
for (uint8_t t = 0; t < sizeof(ads1115_addresses); t++) {
|
|
//AddLog_P2(LOG_LEVEL_INFO, "Logging ADS1115 %02x", ads1115_addresses[t]);
|
|
if (ads1115_found[t]) {
|
|
Ads1115GetValues(ads1115_addresses[t]);
|
|
if (json) {
|
|
Ads1115toJSON(comma);
|
|
comma = (char*)",";
|
|
}
|
|
#ifdef USE_WEBSERVER
|
|
else {
|
|
Ads1115toString(ads1115_addresses[t]);
|
|
}
|
|
#endif // USE_WEBSERVER
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/*********************************************************************************************\
|
|
* Interface
|
|
\*********************************************************************************************/
|
|
|
|
bool Xsns12(uint8_t function)
|
|
{
|
|
bool result = false;
|
|
|
|
if (i2c_flg) {
|
|
switch (function) {
|
|
case FUNC_PREP_BEFORE_TELEPERIOD:
|
|
Ads1115Detect();
|
|
break;
|
|
case FUNC_JSON_APPEND:
|
|
Ads1115Show(1);
|
|
break;
|
|
#ifdef USE_WEBSERVER
|
|
case FUNC_WEB_SENSOR:
|
|
Ads1115Show(0);
|
|
break;
|
|
#endif // USE_WEBSERVER
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif // USE_ADS1115
|
|
#endif // USE_I2C
|