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Code Issues Releases Wiki Activity

mcp3008: added package and samples for mcp3008 10-bit 8-channel adc

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This commit is contained in:
kunalpowar 2014-05-03 21:35:09 +05:30
parent 42033238e2
commit 59958d7dfc
7 changed files with 163 additions and 4 deletions
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28
host/generic/spibus.go
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@ -76,6 +76,10 @@ func NewSPIBus(spiDevMinor, mode, channel byte, speed, bpw, delay int, shouldIni
}
func (b *spiBus) init() error {
if b.initialized {
return nil
}
if b.shouldInitialize {
if err := b.initializer(); err != nil {
return err
@ -83,14 +87,11 @@ func (b *spiBus) init() error {
b.shouldInitialize = false
}
if b.initialized {
return nil
}
var err error
if b.file, err = os.OpenFile(fmt.Sprintf("/dev/spidev%v.%v", b.spiDevMinor, b.channel), os.O_RDWR, os.ModeExclusive); err != nil {
return err
}
glog.V(3).Infof("spi: sucessfully opened file /dev/spidev%v.%v", b.spiDevMinor, b.channel)
err = b.setMode()
if err != nil {
@ -112,6 +113,7 @@ func (b *spiBus) init() error {
b.setDelay()
glog.V(2).Infof("spi: bus %v initialized", b.channel)
glog.V(3).Infof("spi: bus %v initialized with spiIocTransfer as %v", b.channel, b.spiTransferData)
b.initialized = true
return nil
@ -187,6 +189,10 @@ func (b *spiBus) setDelay() {
}
func (b *spiBus) TransferAndRecieveData(dataBuffer []uint8) error {
if err := b.init(); err != nil {
return err
}
len := len(dataBuffer)
dataCarrier := b.spiTransferData
@ -194,16 +200,22 @@ func (b *spiBus) TransferAndRecieveData(dataBuffer []uint8) error {
dataCarrier.txBuf = uint64(uintptr(unsafe.Pointer(&dataBuffer[0])))
dataCarrier.rxBuf = uint64(uintptr(unsafe.Pointer(&dataBuffer[0])))
glog.V(3).Infof("spi: sending dataBuffer %v with carrier %v", dataBuffer, dataCarrier)
_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, b.file.Fd(), uintptr(spiIocMessageN(1)), uintptr(unsafe.Pointer(&dataCarrier)))
if errno != 0 {
err := syscall.Errno(errno)
glog.V(3).Infof("spi: failed to read due to %v", err.Error())
return err
}
glog.V(3).Infof("spi: read into dataBuffer %v", dataBuffer)
return nil
}
func (b *spiBus) ReceiveData(len int) ([]uint8, error) {
if err := b.init(); err != nil {
return nil, err
}
data := make([]uint8, len)
var err error
err = b.TransferAndRecieveData(data)
@ -214,6 +226,10 @@ func (b *spiBus) ReceiveData(len int) ([]uint8, error) {
}
func (b *spiBus) TransferAndReceiveByte(data byte) (byte, error) {
if err := b.init(); err != nil {
return 0, err
}
d := make([]uint8, 1)
d[0] = uint8(data)
err := b.TransferAndRecieveData(d)
@ -224,6 +240,10 @@ func (b *spiBus) TransferAndReceiveByte(data byte) (byte, error) {
}
func (b *spiBus) ReceiveByte() (byte, error) {
if err := b.init(); err != nil {
return 0, err
}
d := make([]uint8, 1)
err := b.TransferAndRecieveData(d)
if err != nil {