Added driver for Adafruit TSL2561
Signed-off-by: Erik Agsjö <erik.agsjo@gmail.com>
This commit is contained in:
Erik Agsjö
parent
3650241fce
commit
daa0af365a
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@ -0,0 +1,472 @@
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package i2c
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import (
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"errors"
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"fmt"
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"gobot.io/x/gobot"
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"time"
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)
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const (
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// TSL2561AddressLow - the address of the device when address pin is low
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TSL2561AddressLow = 0x29
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// TSL2561AddressFloat - the address of the device when address pin is floating
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TSL2561AddressFloat = 0x39
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// TSL2561AddressHigh - the address of the device when address pin is high
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TSL2561AddressHigh = 0x49
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tsl2561CommandBit = 0x80 // Must be 1
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tsl2561ClearBit = 0x40 // Clears any pending interrupt (write 1 to clear)
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tsl2561WordBit = 0x20 // 1 = read/write word (rather than byte)
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tsl2561BlockBit = 0x10 // 1 = using block read/write
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tsl2561ControlPowerOn = 0x03
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tsl2561ControlPowerOff = 0x00
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tsl2561LuxLuxScale = 14 // Scale by 2^14
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tsl2561LuxRatioScale = 9 // Scale ratio by 2^9
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tsl2561LuxChScale = 10 // Scale channel values by 2^10
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tsl2561LuxCHScaleTInt0 = 0x7517 // 322/11 * 2^tsl2561LUXCHSCALE
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tsl2561LuxChScaleTInt1 = 0x0FE7 // 322/81 * 2^tsl2561LUXCHSCALE
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// T, FN and CL package values
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tsl2561LuxK1T = 0x0040 // 0.125 * 2^RATIO_SCALE
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tsl2561LuxB1T = 0x01f2 // 0.0304 * 2^LUX_SCALE
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tsl2561LuxM1T = 0x01be // 0.0272 * 2^LUX_SCALE
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tsl2561LuxK2T = 0x0080 // 0.250 * 2^RATIO_SCALE
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tsl2561LuxB2T = 0x0214 // 0.0325 * 2^LUX_SCALE
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tsl2561LuxM2T = 0x02d1 // 0.0440 * 2^LUX_SCALE
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tsl2561LuxK3T = 0x00c0 // 0.375 * 2^RATIO_SCALE
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tsl2561LuxB3T = 0x023f // 0.0351 * 2^LUX_SCALE
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tsl2561LuxM3T = 0x037b // 0.0544 * 2^LUX_SCALE
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tsl2561LuxK4T = 0x0100 // 0.50 * 2^RATIO_SCALE
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tsl2561LuxB4T = 0x0270 // 0.0381 * 2^LUX_SCALE
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tsl2561LuxM4T = 0x03fe // 0.0624 * 2^LUX_SCALE
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tsl2561LuxK5T = 0x0138 // 0.61 * 2^RATIO_SCALE
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tsl2561LuxB5T = 0x016f // 0.0224 * 2^LUX_SCALE
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tsl2561LuxM5T = 0x01fc // 0.0310 * 2^LUX_SCALE
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tsl2561LuxK6T = 0x019a // 0.80 * 2^RATIO_SCALE
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tsl2561LuxB6T = 0x00d2 // 0.0128 * 2^LUX_SCALE
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tsl2561LuxM6T = 0x00fb // 0.0153 * 2^LUX_SCALE
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tsl2561LuxK7T = 0x029a // 1.3 * 2^RATIO_SCALE
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tsl2561LuxB7T = 0x0018 // 0.00146 * 2^LUX_SCALE
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tsl2561LuxM7T = 0x0012 // 0.00112 * 2^LUX_SCALE
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tsl2561LuxK8T = 0x029a // 1.3 * 2^RATIO_SCALE
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tsl2561LuxB8T = 0x0000 // 0.000 * 2^LUX_SCALE
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tsl2561LuxM8T = 0x0000 // 0.000 * 2^LUX_SCALE
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// Auto-gain thresholds
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tsl2561AgcTHi13MS = 4850 // Max value at Ti 13ms = 5047
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tsl2561AgcTLo13MS = 100
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tsl2561AgcTHi101MS = 36000 // Max value at Ti 101ms = 37177
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tsl2561AgcTLo101MS = 200
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tsl2561AgcTHi402MS = 63000 // Max value at Ti 402ms = 65535
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tsl2561AgcTLo402MS = 500
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// Clipping thresholds
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tsl2561Clipping13MS = 4900
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tsl2561Clipping101MS = 37000
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tsl2561Clipping402MS = 65000
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)
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type tsl2561Register int
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const (
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tsl2561RegisterControl tsl2561Register = 0x00
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tsl2561RegisterTiming = 0x01
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tsl2561RegisterThreshholdLLow = 0x02
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tsl2561RegisterThreshholdLHigh = 0x03
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tsl2561RegisterThreshholdHLow = 0x04
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tsl2561RegisterThreshholdHHigh = 0x05
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tsl2561RegisterInterrupt = 0x06
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tsl2561RegisterCRC = 0x08
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tsl2561RegisterID = 0x0A
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tsl2561RegisterChan0Low = 0x0C
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tsl2561RegisterChan0High = 0x0D
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tsl2561RegisterChan1Low = 0x0E
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tsl2561RegisterChan1High = 0x0F
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)
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// TSL2561IntegrationTime is the type of all valid integration time settings
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type TSL2561IntegrationTime int
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const (
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// TSL2561IntegrationTime13MS integration time 13ms
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TSL2561IntegrationTime13MS TSL2561IntegrationTime = 0x00 // 13.7ms
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// TSL2561IntegrationTime101MS integration time 101ms
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TSL2561IntegrationTime101MS = 0x01 // 101ms
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// TSL2561IntegrationTime402MS integration time 402ms
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TSL2561IntegrationTime402MS = 0x02 // 402ms
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)
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// TSL2561Gain is the type of all valid gain settings
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type TSL2561Gain int
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const (
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// TSL2561Gain1X gain == 1x
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TSL2561Gain1X TSL2561Gain = 0x00 // No gain
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// TSL2561Gain16X gain == 16x
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TSL2561Gain16X = 0x10 // 16x gain
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)
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// TSL2561Driver is the gobot driver for the Adafruit Digital Luminosity/Lux/Light Sensor
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// Datasheet: http://www.adafruit.com/datasheets/TSL2561.pdf
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// Ported from the Adafruit driver at https://github.com/adafruit/Adafruit_TSL2561 by
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// K. Townsend
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type TSL2561Driver struct {
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name string
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connection I2c
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deviceAddress int
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autoGain bool
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gain TSL2561Gain
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integrationTime TSL2561IntegrationTime
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}
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// NewTSL2561Driver creates a new driver with an I2c connector and optional options.
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// Settings are provided with a map like this:
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// options := map[string]int {address: TSL2561AddressLow}
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// d := NewTSL2561Driver(i2ccon, settings)
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func NewTSL2561Driver(c I2c, options ...map[string]int) *TSL2561Driver {
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integrationTime := TSL2561IntegrationTime13MS
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gain := TSL2561Gain1X
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autoGain := false
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address := TSL2561AddressFloat
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if len(options) > 0 {
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for k, v := range options[0] {
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switch k {
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case "address":
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switch v {
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case TSL2561AddressLow, TSL2561AddressFloat, TSL2561AddressHigh:
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address = v
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default:
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panic(fmt.Sprintf("Invalid address %v passed to NewTSL2561Driver", v))
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}
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case "integrationTime":
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switch TSL2561IntegrationTime(v) {
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case TSL2561IntegrationTime13MS, TSL2561IntegrationTime101MS, TSL2561IntegrationTime402MS:
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integrationTime = TSL2561IntegrationTime(v)
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default:
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panic(fmt.Sprintf("Invalid integrationTime %v passed to NewTSL2561Driver", v))
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}
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case "gain":
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switch TSL2561Gain(v) {
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case TSL2561Gain1X, TSL2561Gain16X:
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gain = TSL2561Gain(v)
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default:
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panic(fmt.Sprintf("Invalid gain value '%v' passed to NewTSL2561Driver", v))
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}
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case "autoGain":
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switch {
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case v == 0:
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autoGain = false
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case v == 1:
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autoGain = true
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default:
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panic(fmt.Sprintf("Invalid autoGain value '%v' passwd to NewTSL2561Driver", v))
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}
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default:
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panic(fmt.Sprintf("Unknown option '%v' passed to NewTSL2561Driver", k))
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}
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}
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}
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return &TSL2561Driver{
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name: "TSL2561",
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connection: c,
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deviceAddress: address,
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integrationTime: integrationTime,
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gain: gain,
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autoGain: autoGain,
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}
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}
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// Name returns the name of the device.
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func (d *TSL2561Driver) Name() string {
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return d.name
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}
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// SetName sets the name of the device.
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func (d *TSL2561Driver) SetName(name string) {
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d.name = name
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}
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// Connection returns the connection of the device.
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func (d *TSL2561Driver) Connection() gobot.Connection {
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return d.connection
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}
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// Start initializes the device.
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func (d *TSL2561Driver) Start() error {
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if initialized, err := d.readByteRegister(tsl2561RegisterID); err != nil {
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return err
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} else if (initialized & 0x0A) == 0 {
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return errors.New("TSL2561 device not found")
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}
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d.SetIntegrationTime(d.integrationTime)
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d.SetGain(d.gain)
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d.disable()
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return nil
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}
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// Halt stops the device
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func (d *TSL2561Driver) Halt() error {
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return nil
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}
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// SetIntegrationTime sets integrations time for the TSL2561
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func (d *TSL2561Driver) SetIntegrationTime(time TSL2561IntegrationTime) error {
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if err := d.enable(); err != nil {
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return err
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}
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timeGainVal := uint8(time) | uint8(d.gain)
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if err := d.writeByteRegister(tsl2561CommandBit|tsl2561RegisterTiming, timeGainVal); err != nil {
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return err
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}
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d.integrationTime = time
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return d.disable()
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}
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// SetGain adjusts the TSL2561 gain (sensitivity to light)
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func (d *TSL2561Driver) SetGain(gain TSL2561Gain) error {
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if err := d.enable(); err != nil {
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return err
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}
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timeGainVal := uint8(d.integrationTime) | uint8(gain)
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if err := d.writeByteRegister(tsl2561CommandBit|tsl2561RegisterTiming, timeGainVal); err != nil {
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return err
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}
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d.gain = gain
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return d.disable()
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}
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// GetLuminocity gets the broadband and IR only values from the TSL2561,
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// adjusting gain if auto-gain is enabled
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func (d *TSL2561Driver) GetLuminocity() (broadband uint16, ir uint16, err error) {
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// if auto gain disabled get a single reading and continue
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if !d.autoGain {
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broadband, ir, err = d.getData()
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return
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}
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agcCheck := false
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var hi, lo uint16
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switch d.integrationTime {
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case TSL2561IntegrationTime13MS:
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hi = tsl2561AgcTHi13MS
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lo = tsl2561AgcTLo13MS
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case TSL2561IntegrationTime101MS:
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hi = tsl2561AgcTLo101MS
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lo = tsl2561AgcTHi101MS
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case TSL2561IntegrationTime402MS:
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hi = tsl2561AgcTHi402MS
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lo = tsl2561AgcTLo402MS
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}
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// Read data until we find a valid range
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valid := false
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for {
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broadband, ir, err = d.getData()
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if err != nil {
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return
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}
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// Run an auto-gain check if we haven't already done so
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if !agcCheck {
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if (broadband < lo) && (d.gain == TSL2561Gain1X) {
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// increase gain and try again
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err = d.SetGain(TSL2561Gain16X)
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if err != nil {
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return
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}
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agcCheck = true
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} else if (broadband > hi) && (d.gain == TSL2561Gain16X) {
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// drop gain and try again
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err = d.SetGain(TSL2561Gain1X)
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if err != nil {
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return
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}
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agcCheck = true
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} else {
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// Reading is either valid, or we're already at the chips
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// limits
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valid = true
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}
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} else {
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// If we've already adjusted the gain once, just return the new results.
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// This avoids endless loops where a value is at one extreme pre-gain,
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// and the the other extreme post-gain
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valid = true
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}
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if valid {
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break
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}
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}
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return
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}
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// CalculateLux converts raw sensor values to the standard SI Lux equivalent.
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// Returns 65536 if the sensor is saturated.
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func (d *TSL2561Driver) CalculateLux(broadband uint16, ir uint16) (lux uint32) {
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var chScale uint32
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var channel1 uint32
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var channel0 uint32
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var clipThreshold uint16
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// Set cliplevel and scaling based on integration time
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switch d.integrationTime {
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case TSL2561IntegrationTime13MS:
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clipThreshold = tsl2561Clipping13MS
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chScale = tsl2561LuxCHScaleTInt0
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case TSL2561IntegrationTime101MS:
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clipThreshold = tsl2561Clipping101MS
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chScale = tsl2561LuxChScaleTInt1
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case TSL2561IntegrationTime402MS:
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clipThreshold = tsl2561Clipping402MS
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chScale = (1 << tsl2561LuxChScale)
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}
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// Saturated sensor
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if (broadband > clipThreshold) || (ir > clipThreshold) {
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return 65536
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}
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// Adjust scale for gain
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if d.gain == TSL2561Gain1X {
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chScale = chScale * 16
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}
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channel0 = (uint32(broadband) * chScale) >> tsl2561LuxChScale
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channel1 = (uint32(ir) * chScale) >> tsl2561LuxChScale
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// Find the ratio of the channel values (channel1 / channel0)
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var ratio1 uint32
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if channel0 != 0 {
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ratio1 = (channel1 << (tsl2561LuxRatioScale + 1)) / channel0
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}
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// Round the ratio value
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ratio := (ratio1 + 1) / 2
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var b, m uint32
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switch {
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case (ratio >= 0) && (ratio <= tsl2561LuxK1T):
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b = tsl2561LuxB1T
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m = tsl2561LuxM1T
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case (ratio <= tsl2561LuxK2T):
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b = tsl2561LuxB2T
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m = tsl2561LuxM2T
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case (ratio <= tsl2561LuxK3T):
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b = tsl2561LuxB3T
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m = tsl2561LuxM3T
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case (ratio <= tsl2561LuxK4T):
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b = tsl2561LuxB4T
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m = tsl2561LuxM4T
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case (ratio <= tsl2561LuxK5T):
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b = tsl2561LuxB5T
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m = tsl2561LuxM5T
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case (ratio <= tsl2561LuxK6T):
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b = tsl2561LuxB6T
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m = tsl2561LuxM6T
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case (ratio <= tsl2561LuxK7T):
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b = tsl2561LuxB7T
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m = tsl2561LuxM7T
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case (ratio > tsl2561LuxK8T):
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b = tsl2561LuxB8T
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m = tsl2561LuxM8T
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}
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temp := (channel0 * b) - (channel1 * m)
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// Negative lux not allowed
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if temp < 0 {
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temp = 0
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}
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// Round lsb (2^(LUX_SCALE+1))
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temp += (1 << (tsl2561LuxLuxScale - 1))
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// Strip off fractional portion
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lux = temp >> tsl2561LuxLuxScale
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return lux
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}
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func (d *TSL2561Driver) readByteRegister(reg int) (val uint8, err error) {
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var bytes []uint8
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if bytes, err = d.connection.I2cRead(d.deviceAddress, reg); err != nil {
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return 0, err
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}
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return bytes[0], nil
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}
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func (d *TSL2561Driver) writeByteRegister(reg uint8, val uint8) (err error) {
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err = d.connection.I2cWrite(d.deviceAddress, []byte{reg, val})
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return err
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}
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func (d *TSL2561Driver) writeByteRegisters(regValPairs [][2]uint8) (err error) {
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for _, rv := range regValPairs {
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reg, val := rv[0], rv[1]
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if err = d.connection.I2cWrite(d.deviceAddress, []uint8{reg, val}); err != nil {
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break
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}
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}
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return err
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}
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func (d *TSL2561Driver) read16bitInteger(reg int) (val uint16, err error) {
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if low, err := d.readByteRegister(reg); err != nil {
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return 0, err
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} else if high, err := d.readByteRegister(reg); err != nil {
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return 0, err
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} else {
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return (uint16(high)<<8 | uint16(low)), nil
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}
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}
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func (d *TSL2561Driver) enable() (err error) {
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err = d.writeByteRegister(uint8(tsl2561CommandBit|tsl2561RegisterControl), tsl2561ControlPowerOn)
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return err
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}
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func (d *TSL2561Driver) disable() (err error) {
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err = d.writeByteRegister(uint8(tsl2561CommandBit|tsl2561RegisterControl), tsl2561ControlPowerOff)
|
||||
return err
|
||||
}
|
||||
|
||||
func (d *TSL2561Driver) getData() (broadband uint16, ir uint16, err error) {
|
||||
if err := d.enable(); err != nil {
|
||||
return 0, 0, err
|
||||
}
|
||||
|
||||
// Wait x ms for ADC to complete
|
||||
switch d.integrationTime {
|
||||
case TSL2561IntegrationTime13MS:
|
||||
time.Sleep(15 * time.Millisecond)
|
||||
case TSL2561IntegrationTime101MS:
|
||||
time.Sleep(120 * time.Millisecond)
|
||||
case TSL2561IntegrationTime402MS:
|
||||
time.Sleep(450 * time.Millisecond)
|
||||
}
|
||||
|
||||
// Reads a two byte value from channel 0 (visible + infrared)
|
||||
broadband, err = d.read16bitInteger(tsl2561CommandBit | tsl2561WordBit | tsl2561RegisterChan0Low)
|
||||
|
||||
// Reads a two byte value from channel 1 (infrared)
|
||||
ir, err = d.read16bitInteger(tsl2561CommandBit | tsl2561WordBit | tsl2561RegisterChan1Low)
|
||||
|
||||
d.disable()
|
||||
|
||||
return
|
||||
}
|
||||
|
|
@ -0,0 +1,79 @@
|
|||
package i2c
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"testing"
|
||||
|
||||
"gobot.io/x/gobot"
|
||||
"gobot.io/x/gobot/gobottest"
|
||||
)
|
||||
|
||||
var _ gobot.Driver = (*TSL2561Driver)(nil)
|
||||
|
||||
func initTestTSL2561Driver() (*TSL2561Driver, *i2cTestAdaptor) {
|
||||
adaptor := newI2cTestAdaptor()
|
||||
return NewTSL2561Driver(adaptor), adaptor
|
||||
}
|
||||
|
||||
func TestTSL2561Driver(t *testing.T) {
|
||||
d, adaptor := initTestTSL2561Driver()
|
||||
|
||||
gobottest.Assert(t, d.Name(), "TSL2561")
|
||||
|
||||
adaptor.i2cReadImpl = func() ([]byte, error) {
|
||||
buf := new(bytes.Buffer)
|
||||
// Mock a responding device
|
||||
binary.Write(buf, binary.LittleEndian, int8(0xA))
|
||||
return buf.Bytes(), nil
|
||||
}
|
||||
gobottest.Assert(t, d.Start(), nil)
|
||||
|
||||
gobottest.Assert(t, d.Halt(), nil)
|
||||
}
|
||||
|
||||
func TestBadOption(t *testing.T) {
|
||||
adaptor := newI2cTestAdaptor()
|
||||
options := map[string]int{
|
||||
"hej": 12,
|
||||
}
|
||||
|
||||
defer func() {
|
||||
x := recover()
|
||||
gobottest.Refute(t, x, nil)
|
||||
}()
|
||||
|
||||
device := NewTSL2561Driver(adaptor, options)
|
||||
|
||||
gobottest.Refute(t, device, nil)
|
||||
}
|
||||
|
||||
func TestBadOptionValue(t *testing.T) {
|
||||
adaptor := newI2cTestAdaptor()
|
||||
options := map[string]int{
|
||||
"integrationTime": 47,
|
||||
}
|
||||
|
||||
defer func() {
|
||||
x := recover()
|
||||
gobottest.Refute(t, x, nil)
|
||||
}()
|
||||
|
||||
device := NewTSL2561Driver(adaptor, options)
|
||||
|
||||
gobottest.Refute(t, device, nil)
|
||||
}
|
||||
|
||||
func TestValidOptions(t *testing.T) {
|
||||
adaptor := newI2cTestAdaptor()
|
||||
options := map[string]int{
|
||||
"integrationTime": TSL2561IntegrationTime101MS,
|
||||
"address": TSL2561AddressLow,
|
||||
"gain": TSL2561Gain16X,
|
||||
"autoGain": 1,
|
||||
}
|
||||
|
||||
device := NewTSL2561Driver(adaptor, options)
|
||||
|
||||
gobottest.Refute(t, device, nil)
|
||||
}
|
||||
Loading…
Reference in New Issue