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globals.go
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globals.go
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package ads
import (
"periph.io/x/periph/conn/i2c"
)
// https://cdn-shop.adafruit.com/datasheets/ads1115.pdf
type (
// ConfigInputMultiplexer config input multiplexer
ConfigInputMultiplexer uint16
// ConfigGain config gain amplifier
ConfigGain uint16
// ConfigDataRate config data rate
ConfigDataRate uint16
)
const (
// Bit [15] OS: Operational status/single-shot conversion start
configOperationNone uint16 = 0x0000 // 0 : No effect
configOperationSingle uint16 = 0x8000 // 1 : Begin a single conversion (when in power-down mode)
// Bits [14:12] MUX[2:0]: Input multiplexer configuration (ADS1115 only)
// ConfigInputMultiplexerDifferential01 000 : AINP = AIN0 and AINN = AIN1 (default)
ConfigInputMultiplexerDifferential01 ConfigInputMultiplexer = 0x0000
// ConfigInputMultiplexerDifferential03 001 : AINP = AIN0 and AINN = AIN3
ConfigInputMultiplexerDifferential03 ConfigInputMultiplexer = 0x1000
// ConfigInputMultiplexerDifferential13 010 : AINP = AIN1 and AINN = AIN3
ConfigInputMultiplexerDifferential13 ConfigInputMultiplexer = 0x2000
// ConfigInputMultiplexerDifferential23 011 : AINP = AIN2 and AINN = AIN3
ConfigInputMultiplexerDifferential23 ConfigInputMultiplexer = 0x3000
// ConfigInputMultiplexerSingle0 100 : AINP = AIN0 and AINN = GND
ConfigInputMultiplexerSingle0 ConfigInputMultiplexer = 0x4000
// ConfigInputMultiplexerSingle1 101 : AINP = AIN1 and AINN = GND
ConfigInputMultiplexerSingle1 ConfigInputMultiplexer = 0x5000
// ConfigInputMultiplexerSingle2 110 : AINP = AIN2 and AINN = GND
ConfigInputMultiplexerSingle2 ConfigInputMultiplexer = 0x6000
// ConfigInputMultiplexerSingle3 111 : AINP = AIN3 and AINN = GND
ConfigInputMultiplexerSingle3 ConfigInputMultiplexer = 0x7000
// Bits [11:9] PGA[2:0]: Programmable gain amplifier configuration (ADS1114 and ADS1115 only)
// ConfigGain2_3 gain amplifier 2/3 is +/-6.144V range (default)
ConfigGain2_3 ConfigGain = 0x0000 // 000
// ConfigGain1 gain amplifier 1 is +/-4.096V range
ConfigGain1 ConfigGain = 0x0200 // 001
// ConfigGain2 gain amplifier 2 is +/-2.048V range
ConfigGain2 ConfigGain = 0x0400 // 010
// ConfigGain4 gain amplifier 4 is +/-1.024V range
ConfigGain4 ConfigGain = 0x0600 // 011
// ConfigGain8 gain amplifier 8 is +/-0.512V range
ConfigGain8 ConfigGain = 0x0800 // 100
// ConfigGain16 gain amplifier 16 +/-0.256V range
ConfigGain16 ConfigGain = 0x0A00 // 101
// Bit [8] MODE: Device operating mode
configOperatingModeContinuous uint16 = 0x0000 // 0 : Continuous conversion mode
configOperatingModeSingle uint16 = 0x0100 // 1 : Power-down single-shot mode (default)
// Bits [7:5] DR[2:0]: Data rate
// ConfigDataRate8 data rate of 8 samples per second
ConfigDataRate8 ConfigDataRate = 0x0000 // 000
// ConfigDataRate16 data rate of 16 samples per second
ConfigDataRate16 ConfigDataRate = 0x0020 // 001
// ConfigDataRate32 data rate of 32 samples per second
ConfigDataRate32 ConfigDataRate = 0x0040 // 010
// ConfigDataRate64 data rate of 64 samples per second
ConfigDataRate64 ConfigDataRate = 0x0060 // 011
// ConfigDataRate128 data rate of 128 samples per second (default)
ConfigDataRate128 ConfigDataRate = 0x0080 // 100
// ConfigDataRate250 data rate of 250 samples per second
ConfigDataRate250 ConfigDataRate = 0x00A0 // 101
// ConfigDataRate475 data rate of 475 samples per second
ConfigDataRate475 ConfigDataRate = 0x00C0 // 110
// ConfigDataRate860 data rate of 860 samples per second
ConfigDataRate860 ConfigDataRate = 0x00E0 // 111
// Bit [4] COMP_MODE: Comparator mode (ADS1114 and ADS1115 only)
configComparatorModeTraditional uint16 = 0x0000 // 0 : Traditional comparator with hysteresis (default)
configComparatorModeWindow uint16 = 0x0010 // 1 : Window comparator
// Bit [3] COMP_POL: Comparator polarity (ADS1114 and ADS1115 only)
configComparatorPolarityLow uint16 = 0x0000 // 0 : Active low (default)
configComparatorPolarityHigh uint16 = 0x0008 // 1 : Active high
// Bit [2] COMP_LAT: Latching comparator (ADS1114 and ADS1115 only)
configLatchingComparatorOff uint16 = 0x0000 // 0 : Non-latching comparator (default)
configLatchingComparatorOn uint16 = 0x0004 // 1 : Latching comparator
// Bits [1:0] COMP_QUE: Comparator queue and disable (ADS1114 and ADS1115 only)
configComparatorQueue1 uint16 = 0x0000 // 00 : Assert after one conversion
configComparatorQueue2 uint16 = 0x0001 // 01 : Assert after two conversions
configComparatorQueue4 uint16 = 0x0002 // 10 : Assert after four conversions
configComparatorQueueOff uint16 = 0x0003 // 11 : Disable comparator (default)
// register pointer
registerPointerConversion byte = 0x0000
registerPointerConfig byte = 0x0001
// configDefault is the default config
configDefault = configOperationSingle | // missing ConfigInputMultiplexer and ConfigGain
configOperatingModeSingle | // missing ConfigDataRate
configComparatorModeTraditional | configComparatorPolarityLow | configLatchingComparatorOff | configComparatorQueueOff
)
// ADS struct to interface with the Analog-to-Digital Converter.
// Call NewADS to create a new one.
type ADS struct {
busCloser *i2c.BusCloser
dev *i2c.Dev
configInputMultiplexer uint16
configGain uint16
configDataRate uint16
config []byte
write []byte
read []byte
}