mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-07-26 10:38:41 +00:00
adt7410: add connection test and for that matter connection method
Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
+27
-26
@@ -1,3 +1,7 @@
|
||||
// Package adt7410 provides a driver for the adt7410 I2C Temperature Sensor.
|
||||
//
|
||||
// Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/ADT7410.pdf
|
||||
//
|
||||
package adt7410 // import "tinygo.org/x/drivers/adt7410"
|
||||
|
||||
import (
|
||||
@@ -22,40 +26,37 @@ func (e Error) Error() string {
|
||||
}
|
||||
|
||||
type Device struct {
|
||||
bus drivers.I2C
|
||||
buf []byte
|
||||
addr uint8
|
||||
bus drivers.I2C
|
||||
buf []byte
|
||||
Address uint8
|
||||
}
|
||||
|
||||
// New returns ADT7410 device for the provided I2C bus and address. The ADT7410
|
||||
// has a default address of 0x48 (1001000). The last 2 bits of the address
|
||||
// New returns ADT7410 device for the provided I2C bus using default address.
|
||||
// of 0x48 (1001000). To use multiple ADT7410 devices, the last 2 bits of the address
|
||||
// can be set using by connecting to the A1 and A0 pins to VDD or GND (for a
|
||||
// total of up to 4 devices on a I2C bus). Also note that 10k pullups are
|
||||
// recommended for the SDA and SCL lines.
|
||||
func New(i2c drivers.I2C, addressBits uint8) *Device {
|
||||
func New(i2c drivers.I2C) *Device {
|
||||
return &Device{
|
||||
bus: i2c,
|
||||
buf: make([]byte, 2),
|
||||
addr: Address | (addressBits & 0x3),
|
||||
bus: i2c,
|
||||
buf: make([]byte, 2),
|
||||
Address: Address,
|
||||
}
|
||||
}
|
||||
|
||||
func (dev *Device) Configure() (err error) {
|
||||
|
||||
// verify the chip ID
|
||||
// TODO: According to datasheet, the check below should work; however
|
||||
// this does not seem to be working right, but is not exactly
|
||||
// necessary, so can revisit later to see if there is a bug
|
||||
//id := dev.ReadByte(RegID) & 0xF8
|
||||
//if id != 0xC8 {
|
||||
// err = ErrInvalidID
|
||||
//}
|
||||
|
||||
// Configure the ADT7410 device.
|
||||
func (d *Device) Configure() (err error) {
|
||||
// reset the chip
|
||||
dev.writeByte(RegReset, 0xFF)
|
||||
d.writeByte(RegReset, 0xFF)
|
||||
time.Sleep(10 * time.Millisecond)
|
||||
return
|
||||
}
|
||||
|
||||
// Connected returns whether sensor has been found.
|
||||
func (d *Device) Connected() bool {
|
||||
data := []byte{0}
|
||||
d.bus.ReadRegister(uint8(d.Address), RegID, data)
|
||||
return data[0]&0xF8 == 0xC8
|
||||
}
|
||||
|
||||
// ReadTemperature returns the temperature in celsius milli degrees (°C/1000)
|
||||
@@ -63,13 +64,13 @@ func (d *Device) ReadTemperature() (temperature int32, err error) {
|
||||
return (int32(d.readUint16(RegTempValueMSB)) * 1000) / 128, nil
|
||||
}
|
||||
|
||||
// ReadTempC returns the value in the temperature value register, in Celcius
|
||||
// ReadTempC returns the value in the temperature value register, in Celsius.
|
||||
func (d *Device) ReadTempC() float32 {
|
||||
t := d.readUint16(RegTempValueMSB)
|
||||
return float32(int(t)) / 128.0
|
||||
}
|
||||
|
||||
// ReadTempF returns the value in the temperature value register, in Fahrenheit
|
||||
// ReadTempF returns the value in the temperature value register, in Fahrenheit.
|
||||
func (d *Device) ReadTempF() float32 {
|
||||
return d.ReadTempC()*1.8 + 32.0
|
||||
}
|
||||
@@ -77,15 +78,15 @@ func (d *Device) ReadTempF() float32 {
|
||||
func (d *Device) writeByte(reg uint8, data byte) {
|
||||
d.buf[0] = reg
|
||||
d.buf[1] = data
|
||||
d.bus.Tx(uint16(d.addr), d.buf, nil)
|
||||
d.bus.Tx(uint16(d.Address), d.buf, nil)
|
||||
}
|
||||
|
||||
func (d *Device) readByte(reg uint8) byte {
|
||||
d.bus.ReadRegister(d.addr, reg, d.buf)
|
||||
d.bus.ReadRegister(d.Address, reg, d.buf)
|
||||
return d.buf[0]
|
||||
}
|
||||
|
||||
func (d *Device) readUint16(reg uint8) uint16 {
|
||||
d.bus.ReadRegister(d.addr, reg, d.buf)
|
||||
d.bus.ReadRegister(d.Address, reg, d.buf)
|
||||
return uint16(d.buf[0])<<8 | uint16(d.buf[1])
|
||||
}
|
||||
|
||||
@@ -0,0 +1,49 @@
|
||||
package adt7410
|
||||
|
||||
import (
|
||||
"testing"
|
||||
|
||||
qt "github.com/frankban/quicktest"
|
||||
"tinygo.org/x/drivers/tester"
|
||||
)
|
||||
|
||||
func TestDefaultI2CAddress(t *testing.T) {
|
||||
c := qt.New(t)
|
||||
bus := tester.NewI2CBus(c)
|
||||
dev := New(bus)
|
||||
c.Assert(dev.Address, qt.Equals, uint8(Address))
|
||||
}
|
||||
|
||||
func TestWhoAmI(t *testing.T) {
|
||||
c := qt.New(t)
|
||||
bus := tester.NewI2CBus(c)
|
||||
fake := tester.NewI2CDevice(c, Address)
|
||||
fake.SetupRegisters(defaultRegisters())
|
||||
bus.AddDevice(fake)
|
||||
|
||||
dev := New(bus)
|
||||
c.Assert(dev.Connected(), qt.Equals, true)
|
||||
|
||||
fake.SetupRegister(RegID, 0x99)
|
||||
c.Assert(dev.Connected(), qt.Equals, false)
|
||||
}
|
||||
|
||||
// defaultRegisters returns the default values for all of the device's registers.
|
||||
// see table 22 on page 27 of the datasheet.
|
||||
func defaultRegisters() []uint8 {
|
||||
return []uint8{
|
||||
RegTempValueMSB: 0,
|
||||
RegTempValueLSB: 0,
|
||||
RegStatus: 0,
|
||||
RegConfig: 0,
|
||||
RegTHIGHMsbReg: 0x20,
|
||||
RegTHIGHLsbReg: 0,
|
||||
RegTLOWMsbReg: 0x05,
|
||||
RegTLOWLsbReg: 0,
|
||||
RegTCRITMsbReg: 0x49,
|
||||
RegTCRITLsbReg: 0x80,
|
||||
RegTHYSTReg: 0x05,
|
||||
RegID: 0xC8,
|
||||
RegReset: 0,
|
||||
}
|
||||
}
|
||||
+48
-2
@@ -1,8 +1,33 @@
|
||||
package adt7410
|
||||
|
||||
// 0x00 Temperature value most significant byte 0x00
|
||||
// 0x01 Temperature value least significant byte 0x00
|
||||
// 0x02 Status 0x00
|
||||
// 0x03 Configuration 0x00
|
||||
// 0x04 THIGH setpoint most significant byte 0x20 (64°C)
|
||||
// 0x05 THIGH setpoint least significant byte 0x00 (64°C)
|
||||
// 0x06 TLOW setpoint most significant byte 0x05 (10°C)
|
||||
// 0x07 TLOW setpoint least significant byte 0x00 (10°C)
|
||||
// 0x08 TCRIT setpoint most significant byte 0x49 (147°C)
|
||||
// 0x09 TCRIT setpoint least significant byte 0x80 (147°C)
|
||||
// 0x0A THYST setpoint 0x05 (5°C)
|
||||
// 0x0B ID 0xCX
|
||||
// 0x0C Reserved 0xXX
|
||||
// 0x0D Reserved 0xXX
|
||||
// 0x2E Reserved 0xXX
|
||||
// 0x2F Software reset 0xXX
|
||||
|
||||
const (
|
||||
// Default I2C address
|
||||
// Address is default I2C address.
|
||||
Address = 0x48
|
||||
// Address1 is for first device, aka the default.
|
||||
Address1 = Address
|
||||
// Address2 is for second device.
|
||||
Address2 = 0x49
|
||||
// Address3 is for third device.
|
||||
Address3 = 0x4A
|
||||
// Address4 is for fourth device.
|
||||
Address4 = 0x4B
|
||||
|
||||
// Temperature Value MSB Register
|
||||
RegTempValueMSB = 0x0
|
||||
@@ -16,7 +41,28 @@ const (
|
||||
// Config Register
|
||||
RegConfig = 0x3
|
||||
|
||||
// ID Register
|
||||
// THIGH setpoint most significant byte 0x20 (64°C)
|
||||
RegTHIGHMsbReg = 0x4
|
||||
|
||||
// THIGH setpoint least significant byte 0x00 (64°C)
|
||||
RegTHIGHLsbReg = 0x5
|
||||
|
||||
// TLOW setpoint most significant byte 0x05 (10°C)
|
||||
RegTLOWMsbReg = 0x6
|
||||
|
||||
// TLOW setpoint least significant byte 0x00 (10°C)
|
||||
RegTLOWLsbReg = 0x7
|
||||
|
||||
// TCRIT setpoint most significant byte 0x49 (147°C)
|
||||
RegTCRITMsbReg = 0x8
|
||||
|
||||
// TCRIT setpoint least significant byte 0x80 (147°C)
|
||||
RegTCRITLsbReg = 0x9
|
||||
|
||||
// THYST setpoint 0x05 (5°C)
|
||||
RegTHYSTReg = 0xA
|
||||
|
||||
// ID Register (0xCx)
|
||||
RegID = 0x0B
|
||||
|
||||
// Software Reset Register
|
||||
|
||||
@@ -10,7 +10,7 @@ import (
|
||||
|
||||
var (
|
||||
i2c = &machine.I2C0
|
||||
sensor = adt7410.New(i2c, 0)
|
||||
sensor = adt7410.New(i2c)
|
||||
)
|
||||
|
||||
func main() {
|
||||
|
||||
Reference in New Issue
Block a user