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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
View File

@ -16,35 +16,20 @@ type mcp3008 struct {
var SingleMode byte = 1 var SingleMode byte = 1
var DifferenceMode byte = 0 var DifferenceMode byte = 0
func New(mode byte, spiChan, speed int) (*mcp3008, error) { func New(mode byte, bus embd.SPIBus) *mcp3008 {
if err := embd.InitSPI(); err != nil { return &mcp3008{mode, bus}
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 (m *mcp3008) AnalogValueAt(chanNum int) (int, error) { func (m *mcp3008) AnalogValueAt(chanNum int) (int, error) {
var data [3]uint8 data := make([]uint8, 3)
data[0] = 1 data[0] = 1
data[1] = uint8(m.mode)<<7 | uint8(chanNum)<<4 data[1] = uint8(m.mode)<<7 | uint8(chanNum)<<4
data[2] = 0 data[2] = 0
glog.V(2).Infof("mcp3008: sendingdata buffer %v", data)
if err := m.bus.TransferAndRecieveData(data); err != nil { if err := m.bus.TransferAndRecieveData(data); err != nil {
return 0, err return 0, err
} }
return int(uint16(data[1]&0x03)<<8 | uint16(data[2])), nil 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
}

16
samples/mcp3008.go
View File

@ -8,17 +8,23 @@ import (
"time" "time"
"github.com/kidoman/embd/convertors/mcp3008" "github.com/kidoman/embd/convertors/mcp3008"
"github.com/kidoman/embd"
) )
func main() { func main() {
flag.Parse() flag.Parse()
fmt.Println("This is a sample code for mcp3008 10bit 8 channel ADC") fmt.Println("this is a sample code for mcp3008 10bit 8 channel ADC")
adc, err := mcp3008.New(mcp3008.SingleMode, 0, 1000000) if err := embd.InitSPI(); err != nil {
if err != nil {
panic(err) panic(err)
} }
defer adc.Close() defer embd.CloseSPI()
spiBus := embd.NewSPIBus(embd.SpiMode0, 0, 1000000, 8, 0)
defer spiBus.Close()
adc := mcp3008.New(mcp3008.SingleMode, spiBus)
for i := 0; i < 20; i++ { for i := 0; i < 20; i++ {
time.Sleep(1 * time.Second) time.Sleep(1 * time.Second)
@ -27,7 +33,7 @@ func main() {
panic(err) panic(err)
} }
fmt.Printf("Analog value is: %v\n", val) fmt.Printf("analog value is: %v\n", val)
} }
} }