go-embedded/embd
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spi: remove types from const declarations and added few more go docs

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This commit is contained in:
kunalpowar 2014-05-22 02:58:15 +05:30
parent 2d3dee8764
commit 32c9a96af5
2 changed files with 21 additions and 15 deletions
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21
convertors/mcp3008/mcp3008.go
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@ -5,16 +5,22 @@ import (
"github.com/kidoman/embd"
)
// MCP3008 represents a mcp3008 8bit DAC
// MCP3008 represents a mcp3008 8bit DAC.
type MCP3008 struct {
mode byte
Mode byte
bus embd.SPIBus
Bus embd.SPIBus
}
var SingleMode byte = 1
var DifferenceMode byte = 0
const (
// SingleMode represents the single-ended mode for the mcp3008.
SingleMode = 1
// DifferenceMode represents the diffenrential mode for the mcp3008.
DifferenceMode = 0
)
// New creates a representation of the mcp3008 convertor
func New(mode byte, bus embd.SPIBus) *MCP3008 {
return &MCP3008{mode, bus}
}
@ -23,14 +29,15 @@ const (
startBit = 1
)
// AnalogValueAt returns the analog value at the given channel of the convertor.
func (m *MCP3008) AnalogValueAt(chanNum int) (int, error) {
var data [3]uint8
data[0] = startBit
data[1] = uint8(m.mode)<<7 | uint8(chanNum)<<4
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 {
if err := m.Bus.TransferAndRecieveData(data[:]); err != nil {
return 0, err
}