73 lines
1.8 KiB
Go
73 lines
1.8 KiB
Go
package spi
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import (
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"fmt"
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"strconv"
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"gobot.io/x/gobot/v2"
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)
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// MCP3208DriverMaxChannel is the number of channels of this A/D converter.
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const MCP3208DriverMaxChannel = 8
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// MCP3208Driver is a driver for the MCP3208 A/D converter.
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type MCP3208Driver struct {
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*Driver
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}
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// NewMCP3208Driver creates a new Gobot Driver for MCP3208Driver A/D converter
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//
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// Params:
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//
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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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//
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// spi.WithBusNumber(int): bus to use with this driver
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// spi.WithChipNumber(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.WithBitCount(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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func NewMCP3208Driver(a Connector, options ...func(Config)) *MCP3208Driver {
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d := &MCP3208Driver{
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Driver: NewDriver(a, "MCP3208"),
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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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// Read reads the current analog data for the desired channel.
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func (d *MCP3208Driver) Read(channel int) (int, error) {
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if channel < 0 || channel > MCP3208DriverMaxChannel-1 {
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return 0, fmt.Errorf("Invalid channel '%d' for read", channel)
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}
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tx := make([]byte, 3)
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tx[0] = 0x06 + (byte(channel) >> 2)
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tx[1] = (byte(channel) & 0x03) << 6
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tx[2] = 0x00
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rx := make([]byte, 3)
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if err := d.connection.ReadCommandData(tx, rx); err != nil || len(rx) != 3 {
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return 0, err
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}
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result := int((rx[1]&0xf))<<8 + int(rx[2])
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return result, nil
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}
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// AnalogRead returns value from analog reading of specified pin, scaled to 0-1023 value.
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func (d *MCP3208Driver) AnalogRead(pin string) (int, error) {
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channel, _ := strconv.Atoi(pin)
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value, err := d.Read(channel)
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if err != nil {
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return 0, err
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}
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return int(gobot.ToScale(gobot.FromScale(float64(value), 0, 4095), 0, 1023)), err
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}
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