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Minor tweaks to work with 12-bit variat MCP3208, which is identical to the MCP3008 execpt for being 12 bits.

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Signed-off-by: npotts <npotts@users.noreply.github.com>
This commit is contained in:
npotts 2016-01-09 23:59:27 -07:00
parent bfcd1345fe
commit 9f861dd162
1 changed files with 18 additions and 6 deletions
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22
convertors/mcp3008/mcp3008.go
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@ -8,11 +8,16 @@ import (
// MCP3008 represents a mcp3008 8bit DAC. // MCP3008 represents a mcp3008 8bit DAC.
type MCP3008 struct { type MCP3008 struct {
Mode byte Mode, Bits byte
Bus embd.SPIBus Bus embd.SPIBus
} }
//How many bits does the
const (
Bits10 = iota //10 bit MCP300** family
Bits12 //12 bit MCP320** family
)
const ( const (
// SingleMode represents the single-ended mode for the mcp3008. // SingleMode represents the single-ended mode for the mcp3008.
SingleMode = 1 SingleMode = 1
@ -22,8 +27,8 @@ const (
) )
// New creates a representation of the mcp3008 convertor // New creates a representation of the mcp3008 convertor
func New(mode byte, bus embd.SPIBus) *MCP3008 { func New(mode, bits byte, bus embd.SPIBus) *MCP3008 {
return &MCP3008{mode, bus} return &MCP3008{Mode: mode, Bus: bus}
} }
const ( const (
@ -41,6 +46,13 @@ func (m *MCP3008) AnalogValueAt(chanNum int) (int, error) {
if err := m.Bus.TransferAndReceiveData(data[:]); err != nil { if err := m.Bus.TransferAndReceiveData(data[:]); err != nil {
return 0, err return 0, err
} }
switch m.Bits {
case Bits10:
return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil
case Bits12:
return int(uint16(data[1]&0x0f)<<8 | uint16(data[2])), nil
default:
panic("mcp3008: unknown number of bits")
}
} }