103 lines
2.7 KiB
Go
103 lines
2.7 KiB
Go
package spi
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import (
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"errors"
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"strconv"
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"gobot.io/x/gobot"
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)
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// MCP3008DriverMaxChannel is the number of channels of this A/D converter.
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const MCP3008DriverMaxChannel = 8
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// MCP3008Driver is a driver for the MCP3008 A/D converter.
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type MCP3008Driver struct {
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name string
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connector Connector
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connection Connection
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Config
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gobot.Commander
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}
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// NewMCP3008Driver creates a new Gobot Driver for MCP3008Driver A/D converter
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//
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// Params:
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// a *Adaptor - the Adaptor to use with this Driver
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//
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// Optional params:
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// spi.WithBus(int): bus to use with this driver
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// spi.WithChip(int): chip to use with this driver
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// spi.WithMode(int): mode to use with this driver
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// spi.WithBits(int): number of bits to use with this driver
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// spi.WithSpeed(int64): speed in Hz to use with this driver
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//
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func NewMCP3008Driver(a Connector, options ...func(Config)) *MCP3008Driver {
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d := &MCP3008Driver{
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name: gobot.DefaultName("MCP3008"),
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connector: a,
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Config: NewConfig(),
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}
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for _, option := range options {
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option(d)
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}
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return d
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}
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// Name returns the name of the device.
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func (d *MCP3008Driver) Name() string { return d.name }
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// SetName sets the name of the device.
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func (d *MCP3008Driver) SetName(n string) { d.name = n }
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// Connection returns the Connection of the device.
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func (d *MCP3008Driver) Connection() gobot.Connection { return d.connection.(gobot.Connection) }
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// Start initializes the driver.
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func (d *MCP3008Driver) Start() (err error) {
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bus := d.GetBusOrDefault(d.connector.GetSpiDefaultBus())
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chip := d.GetChipOrDefault(d.connector.GetSpiDefaultChip())
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mode := d.GetModeOrDefault(d.connector.GetSpiDefaultMode())
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bits := d.GetBitsOrDefault(d.connector.GetSpiDefaultBits())
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maxSpeed := d.GetSpeedOrDefault(d.connector.GetSpiDefaultMaxSpeed())
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d.connection, err = d.connector.GetSpiConnection(bus, chip, mode, bits, maxSpeed)
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if err != nil {
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return err
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}
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return nil
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}
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// Halt stops the driver.
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func (d *MCP3008Driver) Halt() (err error) {
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return
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}
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// Read reads the current analog data for the desired channel.
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func (d *MCP3008Driver) Read(channel int) (result int, err error) {
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if channel < 0 || channel > MCP3008DriverMaxChannel-1 {
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return 0, errors.New("Invalid channel for read")
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}
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tx := make([]byte, 3)
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tx[0] = 0x01
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tx[1] = byte(8+channel) << 4
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tx[2] = 0x00
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rx := make([]byte, 3)
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err = d.connection.Tx(tx, rx)
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if err == nil && len(rx) == 3 {
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result = int((rx[1]&0x3))<<8 + int(rx[2])
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}
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return result, err
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}
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// AnalogRead returns value from analog reading of specified pin
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func (d *MCP3008Driver) AnalogRead(pin string) (value int, err error) {
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channel, _ := strconv.Atoi(pin)
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value, err = d.Read(channel)
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return
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}
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