mirror of
https://github.com/tinygo-org/drivers.git
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AMG88xx thermal camera module
This commit is contained in:
Daniel Esteban
committed by
Ron Evans
Ron Evans
parent
08cc84ce48
commit
ebceed6014
@@ -13,6 +13,8 @@ smoke-test:
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/adxl345/main.go
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=pybadge ./examples/amg88xx
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/main.go
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@md5sum ./build/test.hex
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tinygo build -size short -o ./build/test.hex -target=itsybitsy-m0 ./examples/apa102/itsybitsy-m0/main.go
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@@ -58,6 +58,7 @@ The following 45 devices are supported.
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|----------|-------------|
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| [ADT7410 I2C Temperature Sensor](https://www.analog.com/media/en/technical-documentation/data-sheets/ADT7410.pdf) | I2C |
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| [ADXL345 accelerometer](http://www.analog.com/media/en/technical-documentation/data-sheets/ADXL345.pdf) | I2C |
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| [AMG88xx 8x8 Thermal camera sensor](https://cdn-learn.adafruit.com/assets/assets/000/043/261/original/Grid-EYE_SPECIFICATIONS%28Reference%29.pdf) | I2C |
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| [APA102 RGB LED](https://cdn-shop.adafruit.com/product-files/2343/APA102C.pdf) | SPI |
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| [AT24CX 2-wire serial EEPROM](https://www.openimpulse.com/blog/wp-content/uploads/wpsc/downloadables/24C32-Datasheet.pdf) | I2C |
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| [BH1750 ambient light sensor](https://www.mouser.com/ds/2/348/bh1750fvi-e-186247.pdf) | I2C |
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@@ -0,0 +1,158 @@
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// Package amg88xx provides a driver for the AMG88XX Thermal Camera
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//
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// Datasheet:
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// https://cdn-learn.adafruit.com/assets/assets/000/043/261/original/Grid-EYE_SPECIFICATIONS%28Reference%29.pdf
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package amg88xx // import "tinygo.org/x/drivers/amg88xx"
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import (
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"machine"
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"time"
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)
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// Device wraps an I2C connection to a AMG88xx device.
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type Device struct {
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bus machine.I2C
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Address uint16
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data []uint8
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interruptMode InterruptMode
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interruptEnable uint8
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}
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type InterruptMode uint8
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type Config struct {
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}
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// New creates a new AMG88xx connection. The I2C bus must already be
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// configured.
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//
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// This function only creates the Device object, it does not touch the device.
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func New(bus machine.I2C) Device {
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return Device{
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bus: bus,
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Address: AddressHigh,
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}
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}
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// Configure sets up the device for communication
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func (d *Device) Configure(cfg Config) {
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d.data = make([]uint8, 128)
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d.SetPCTL(NORMAL_MODE)
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d.SetReset(INITIAL_RESET)
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d.SetFrameRate(FPS_10)
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time.Sleep(100 * time.Millisecond)
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}
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// ReadPixels returns the 64 values (8x8 grid) of the sensor converted to millicelsius
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func (d *Device) ReadPixels(buffer *[64]int16) {
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d.bus.ReadRegister(uint8(d.Address), PIXEL_OFFSET, d.data)
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for i := 0; i < 64; i++ {
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buffer[i] = int16((uint16(d.data[2*i+1]) << 8) | uint16(d.data[2*i]))
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if (buffer[i] & (1 << 11)) > 0 { // temperature negative
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buffer[i] &= ^(1 << 11)
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buffer[i] = -buffer[i]
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}
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buffer[i] *= PIXEL_TEMP_CONVERSION
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}
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}
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// SetPCTL sets the PCTL
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func (d *Device) SetPCTL(pctl uint8) {
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d.bus.WriteRegister(uint8(d.Address), PCTL, []byte{pctl})
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}
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// SetReset sets the reset value
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func (d *Device) SetReset(rst uint8) {
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d.bus.WriteRegister(uint8(d.Address), RST, []byte{rst})
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}
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// SetFrameRate configures the frame rate
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func (d *Device) SetFrameRate(framerate uint8) {
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d.bus.WriteRegister(uint8(d.Address), FPSC, []byte{framerate & 0x01})
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}
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// SetMovingAverageMode sets the moving average mode
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func (d *Device) SetMovingAverageMode(mode bool) {
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var value uint8
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if mode {
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value = 1
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}
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d.bus.WriteRegister(uint8(d.Address), AVE, []byte{value << 5})
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}
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// SetInterruptLevels sets the interrupt levels
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func (d *Device) SetInterruptLevels(high int16, low int16) {
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d.SetInterruptLevelsHysteresis(high, low, (high*95)/100)
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}
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// SetInterruptLevelsHysteresis sets the interrupt levels with hysteresis
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func (d *Device) SetInterruptLevelsHysteresis(high int16, low int16, hysteresis int16) {
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high = high / PIXEL_TEMP_CONVERSION
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if high < -4095 {
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high = -4095
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}
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if high > 4095 {
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high = 4095
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}
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8(high & 0xFF)})
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8((high & 0xFF) >> 4)})
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low = low / PIXEL_TEMP_CONVERSION
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if low < -4095 {
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low = -4095
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}
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if low > 4095 {
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low = 4095
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}
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8(low & 0xFF)})
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8((low & 0xFF) >> 4)})
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hysteresis = hysteresis / PIXEL_TEMP_CONVERSION
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if hysteresis < -4095 {
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hysteresis = -4095
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}
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if hysteresis > 4095 {
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hysteresis = 4095
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}
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8(hysteresis & 0xFF)})
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d.bus.WriteRegister(uint8(d.Address), INTHL, []byte{uint8((hysteresis & 0xFF) >> 4)})
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}
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// EnableInterrupt enables the interrupt pin on the device
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func (d *Device) EnableInterrupt() {
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d.interruptEnable = 1
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d.bus.WriteRegister(uint8(d.Address), INTC, []byte{((uint8(d.interruptMode) << 1) | d.interruptEnable) & 0x03})
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}
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// DisableInterrupt disables the interrupt pin on the device
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func (d *Device) DisableInterrupt() {
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d.interruptEnable = 0
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d.bus.WriteRegister(uint8(d.Address), INTC, []byte{((uint8(d.interruptMode) << 1) | d.interruptEnable) & 0x03})
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}
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// SetInterruptMode sets the interrupt mode
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func (d *Device) SetInterruptMode(mode InterruptMode) {
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d.interruptMode = mode
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d.bus.WriteRegister(uint8(d.Address), INTC, []byte{((uint8(d.interruptMode) << 1) | d.interruptEnable) & 0x03})
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}
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// GetInterrupt reads the state of the triggered interrupts
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func (d *Device) GetInterrupt() []uint8 {
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data := make([]uint8, 8)
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d.bus.ReadRegister(uint8(d.Address), INT_OFFSET, data)
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return data
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}
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// ClearInterrupt clears any triggered interrupts
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func (d *Device) ClearInterrupt() {
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d.SetReset(FLAG_RESET)
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}
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// ReadThermistor reads the onboard thermistor
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func (d *Device) ReadThermistor() int16 {
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data := make([]uint8, 2)
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d.bus.ReadRegister(uint8(d.Address), TTHL, data)
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return (int16((uint16(data[1])<<8)|uint16(data[0])) * THERMISTOR_CONVERSION) / 10
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}
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@@ -0,0 +1,46 @@
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package amg88xx
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// The I2C address which this device listens to.
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const AddressHigh = 0x69
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const AddressLow = 0x68
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const (
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PCTL = 0x00
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RST = 0x01
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FPSC = 0x02
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INTC = 0x03
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STAT = 0x04
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SCLR = 0x05
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AVE = 0x07
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INTHL = 0x08
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INTHH = 0x09
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INTLL = 0x0A
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INTLH = 0x0B
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IHYSL = 0x0C
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IHYSH = 0x0D
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TTHL = 0x0E
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TTHH = 0x0F
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INT_OFFSET = 0x010
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PIXEL_OFFSET = 0x80
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// power modes
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NORMAL_MODE = 0x00
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SLEEP_MODE = 0x01
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STAND_BY_60 = 0x20
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STAND_BY_10 = 0x21
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// resets
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FLAG_RESET = 0x30
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INITIAL_RESET = 0x3F
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// frame rates
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FPS_10 = 0x00
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FPS_1 = 0x01
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// interrupt modes
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DIFFERENCE InterruptMode = 0x00
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ABSOLUTE_VALUE InterruptMode = 0x01
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PIXEL_TEMP_CONVERSION = 250
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THERMISTOR_CONVERSION = 625
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)
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File diff suppressed because one or more lines are too long
@@ -0,0 +1,56 @@
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package main
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import (
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"image/color"
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"machine"
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"tinygo.org/x/drivers/st7735"
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"tinygo.org/x/drivers/amg88xx"
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)
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func main() {
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machine.SPI1.Configure(machine.SPIConfig{
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SCK: machine.SPI1_SCK_PIN,
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MOSI: machine.SPI1_MOSI_PIN,
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MISO: machine.SPI1_MISO_PIN,
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Frequency: 8000000,
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})
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machine.I2C0.Configure(machine.I2CConfig{SCL: machine.SCL_PIN, SDA: machine.SDA_PIN})
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display := st7735.New(machine.SPI1, machine.TFT_RST, machine.TFT_DC, machine.TFT_CS, machine.TFT_LITE)
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display.Configure(st7735.Config{
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Rotation: st7735.ROTATION_90,
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})
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display.FillScreen(color.RGBA{0, 0, 0, 255})
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camera := amg88xx.New(machine.I2C0)
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camera.Configure(amg88xx.Config{})
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var data [64]int16
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var value int16
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for {
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// get the values of the sensor in millicelsius
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camera.ReadPixels(&data)
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for j := int16(0); j < 8; j++ {
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for i := int16(0); i < 8; i++ {
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value = data[63-(i+j*8)]
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// treat anything below 18°C as 18°C
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if value < 18000 {
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value = 0
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} else {
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value = (value - 18000) / 36
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// our color array only have 433 values, avoid getting a value that doesn't exist
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if value > 432 {
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value = 432
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}
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}
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// show the image on the PyBadge's display
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display.FillRectangle(16+i*16, j*16, 16, 16, colors[value])
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}
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}
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}
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}
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