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mcp3008: changes to use external spiBus

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This commit is contained in:
kunalpowar 2014-05-08 23:28:29 +05:30
parent 1bb2bac8f1
commit dbc97bd15c
2 changed files with 15 additions and 24 deletions
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23
convertors/mcp3008/mcp3008.go
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@ -16,35 +16,20 @@ type mcp3008 struct {
var SingleMode byte = 1
var DifferenceMode byte = 0
func New(mode byte, spiChan, speed int) (*mcp3008, error) {
if err := embd.InitSPI(); err != nil {
return nil, err
}
glog.V(3).Infof("mcp3008: getting spiBus with mode: %v, channel: %v, speed: %v", mode, spiChan, speed)
spiBus := embd.NewSPIBus(embd.SpiMode0, byte(spiChan), speed, 0, 0)
return &mcp3008{mode, spiBus}, nil
func New(mode byte, bus embd.SPIBus) *mcp3008 {
return &mcp3008{mode, bus}
}
func (m *mcp3008) AnalogValueAt(chanNum int) (int, error) {
var data [3]uint8
data := make([]uint8, 3)
data[0] = 1
data[1] = uint8(m.mode)<<7 | uint8(chanNum)<<4
data[2] = 0
glog.V(2).Infof("mcp3008: sendingdata buffer %v", data)
if err := m.bus.TransferAndRecieveData(data); err != nil {
return 0, err
}
return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil
}
func (m *mcp3008) Close() error {
glog.V(2).Infoln("mcp3008: performing cleanup")
if err := m.bus.Close(); err != nil {
return err
}
if err := embd.CloseSPI(); err != nil {
return err
}
return nil
}