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adt7410: add connection test and for that matter connection method

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Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
2020-08-27 13:27:13 +02:00
committed by Ron Evans
parent ce9c93f228
commit 705f474897
4 changed files with 125 additions and 29 deletions
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adt7410/adt7410.go
+27 -26
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@@ -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])
}