67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
package spi
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import (
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"fmt"
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"strconv"
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)
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// MCP3004DriverMaxChannel is the number of channels of this A/D converter.
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const MCP3004DriverMaxChannel = 4
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// MCP3004Driver is a driver for the MCP3008 A/D converter.
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type MCP3004Driver struct {
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*Driver
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}
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// NewMCP3004Driver creates a new Gobot Driver for MCP3004 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 NewMCP3004Driver(a Connector, options ...func(Config)) *MCP3004Driver {
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d := &MCP3004Driver{
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Driver: NewDriver(a, "MCP3004"),
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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 *MCP3004Driver) Read(channel int) (result int, err error) {
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if channel < 0 || channel > MCP3004DriverMaxChannel-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] = 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.ReadCommandData(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 *MCP3004Driver) 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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