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//go:build sam && atsamd21
// This is the definition for I2S bus functions.
// Actual implementations if available for any given hardware
// are to be found in its the board definition.
//
// For more info about I2S, see: https://en.wikipedia.org/wiki/I%C2%B2S
//
package machine
import "errors"
// If you are getting a compile error on this line please check to see you've
// correctly implemented the methods on the I2S type. They must match
// the interface method signatures type to type perfectly.
// If not implementing the I2S type please remove your target from the build tags
// at the top of this file.
var _ interface {
SetSampleFrequency(freq uint32) error
ReadMono(b []uint16) (int, error)
ReadStereo(b []uint32) (int, error)
WriteMono(b []uint16) (int, error)
WriteStereo(b []uint32) (int, error)
Enable(enabled bool)
} = (*I2S)(nil)
type I2SMode uint8
type I2SStandard uint8
type I2SClockSource uint8
type I2SDataFormat uint8
const (
I2SModeSource I2SMode = iota
I2SModeReceiver
I2SModePDM
I2SModeSourceReceiver
)
const (
I2StandardPhilips I2SStandard = iota
I2SStandardMSB
I2SStandardLSB
)
const (
I2SClockSourceInternal I2SClockSource = iota
I2SClockSourceExternal
)
const (
I2SDataFormatDefault I2SDataFormat = 0
I2SDataFormat8bit = 8
I2SDataFormat16bit = 16
I2SDataFormat24bit = 24
I2SDataFormat32bit = 32
)
var (
ErrInvalidSampleFrequency = errors.New("i2s: invalid sample frequency")
)
// All fields are optional and may not be required or used on a particular platform.
type I2SConfig struct {
// clock
SCK Pin
// word select
WS Pin
// data out
SDO Pin
// data in
SDI Pin
Mode I2SMode
Standard I2SStandard
ClockSource I2SClockSource
DataFormat I2SDataFormat
AudioFrequency uint32
MainClockOutput bool
Stereo bool
}
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