Improve interactive shell speed after CPU usage reduction

RaspberryPi/apple2driver/a2io/communication.go

@@ -15,7 +15,7 @@ type A2Io interface {
 	WriteString(outString string) error
 	WriteBlock(buffer []byte) error
 	WriteBuffer(buffer []byte) error
-	ReadByte() (byte, error)
+	ReadByte(noDelay ...bool) (byte, error)
 	ReadString() (string, error)
 	ReadBlock(buffer []byte) error
 	SendCharacter(character byte)

RaspberryPi/apple2driver/a2io/gpio.go

@@ -154,7 +154,7 @@ func (a2 A2Gpio) WriteString(outString string) error {
 }
 
 // ReadByte reads a byte from the Apple II via Raspberry Pi's GPIO ports
-func (a2 A2Gpio) ReadByte() (byte, error) {
+func (a2 A2Gpio) ReadByte(noDelay ...bool) (byte, error) {
 	// let the Apple II know we are ready to read
 	outRead.Low()
 
@@ -168,7 +168,9 @@ func (a2 A2Gpio) ReadByte() (byte, error) {
 			return 0, errors.New("timed out reading byte -- write stuck high")
 		}
 		if time.Since(lastSleepTime) > edgeTimeout/10 {
-			sleepDuration *= 3;
+			if len(noDelay) == 0 || !noDelay[0] {
+				sleepDuration *= 3;
+			}
 			time.Sleep(time.Millisecond * time.Duration(sleepDuration));
 			lastSleepTime = time.Now()
 		}
@@ -225,7 +227,9 @@ func (a2 A2Gpio) ReadByte() (byte, error) {
 			return 0, errors.New("timed out reading byte -- write stuck low")
 		}
 		if time.Since(lastSleepTime) > edgeTimeout/10 {
-			sleepDuration *= 3;
+			if len(noDelay) == 0 || !noDelay[0] {
+				sleepDuration *= 3;
+			}
 			time.Sleep(time.Millisecond * time.Duration(sleepDuration));
 			lastSleepTime = time.Now()
 		}

RaspberryPi/apple2driver/a2io/mockio.go

@@ -66,7 +66,7 @@ func (mockIo MockIo) WriteBuffer(buffer []byte) error {
 }
 
 // ReadByte mocks reading a byte from the Apple II
-func (mockIo MockIo) ReadByte() (byte, error) {
+func (mockIo MockIo) ReadByte(noDelay ...bool) (byte, error) {
 	b := mockIo.Data.BytesToRead[mockIo.Data.NumberBytesRead]
 	mockIo.Data.NumberBytesRead++
 	return b, mockIo.Data.ErrorToThrow

RaspberryPi/apple2driver/a2io/userio.go

@@ -55,7 +55,7 @@ func (userIo UserIo) WriteBuffer(buffer []byte) error {
 }
 
 // ReadByte simulates reading to the Apple II but uses stdin instead
-func (userIo UserIo) ReadByte() (byte, error) {
+func (userIo UserIo) ReadByte(noDelay ...bool) (byte, error) {
 	fmt.Printf("ReadByte: ")
 	var b byte
 	fmt.Scanf("%x", &b)

RaspberryPi/apple2driver/a2io/vt100.go

@@ -220,7 +220,7 @@ func sendCharacter(comm A2Io, b byte) {
 }
 
 func readCharacter(comm A2Io) (string, error) {
-	b, err := comm.ReadByte()
+	b, err := comm.ReadByte(true)
 	var s = string(b)
 	if err == nil {
 		if applicationMode {

RaspberryPi/apple2driver/driver.go

@@ -75,7 +75,7 @@ func main() {
 			}
 			// temporary workaround for busy wait loop heating up the RPi
 		} else {
-			time.Sleep(time.Millisecond * 100)
+			time.Sleep(time.Millisecond * 200)
 		}
 	}
 }

RaspberryPi/apple2driver/info/version.go

@@ -8,4 +8,4 @@ package info
 
 // Version is the hexadecimal version number that
 // should be incremented with each driver update
-const Version = "002A"
+const Version = "002B"