mirror of https://github.com/kidoman/embd
Minor tweaks to work with 12-bit variat MCP3208, which is identical to the MCP3008 execpt for being 12 bits.
Signed-off-by: npotts <npotts@users.noreply.github.com>
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@ -8,11 +8,16 @@ import (
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// MCP3008 represents a mcp3008 8bit DAC.
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type MCP3008 struct {
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Mode byte
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Bus embd.SPIBus
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Mode, Bits byte
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Bus embd.SPIBus
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}
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//How many bits does the
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const (
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Bits10 = iota //10 bit MCP300** family
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Bits12 //12 bit MCP320** family
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)
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const (
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// SingleMode represents the single-ended mode for the mcp3008.
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SingleMode = 1
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@ -22,8 +27,8 @@ const (
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)
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// New creates a representation of the mcp3008 convertor
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func New(mode byte, bus embd.SPIBus) *MCP3008 {
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return &MCP3008{mode, bus}
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func New(mode, bits byte, bus embd.SPIBus) *MCP3008 {
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return &MCP3008{Mode: mode, Bus: bus}
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}
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const (
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@ -41,6 +46,13 @@ func (m *MCP3008) AnalogValueAt(chanNum int) (int, error) {
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if err := m.Bus.TransferAndReceiveData(data[:]); err != nil {
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return 0, err
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}
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switch m.Bits {
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case Bits10:
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return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil
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case Bits12:
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return int(uint16(data[1]&0x0f)<<8 | uint16(data[2])), nil
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default:
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panic("mcp3008: unknown number of bits")
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}
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return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil
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}
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