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package machine
import "errors"
var errNoByte = errors.New("machine: no byte read")
// UARTConfig is a struct with which a UART (or similar object) can be
// configured. The baud rate is usually respected, but TX and RX may be ignored
// depending on the chip and the type of object.
type UARTConfig struct {
BaudRate uint32
TX Pin
RX Pin
RTS Pin
CTS Pin
}
// NullSerial is a serial version of /dev/null (or null router): it drops
// everything that is written to it.
type NullSerial struct {
}
// Configure does nothing: the null serial has no configuration.
func (ns NullSerial) Configure(config UARTConfig) error {
return nil
}
// WriteByte is a no-op: the null serial doesn't write bytes.
func (ns NullSerial) WriteByte(b byte) error {
return nil
}
// ReadByte always returns an error because there aren't any bytes to read.
func (ns NullSerial) ReadByte() (byte, error) {
return 0, errNoByte
}
// Buffered returns how many bytes are buffered in the UART. It always returns 0
// as there are no bytes to read.
func (ns NullSerial) Buffered() int {
return 0
}
// Write is a no-op: none of the data is being written and it will not return an
// error.
func (ns NullSerial) Write(p []byte) (n int, err error) {
return len(p), nil
}
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