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Code Issues Releases Wiki Activity

PL2303(HX) support non-standard baud rates

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This commit is contained in:
kai-morich
2020-09-27 17:34:29 +02:00
parent 1adf2a9b98
commit 732e138630
3 changed files with 89 additions and 58 deletions
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usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/FtdiSerialDriver.java
+3 -3
View File
@@ -176,7 +176,7 @@ public class FtdiSerialDriver implements UsbSerialDriver {
private void setBaudrate(int baudRate) throws IOException {
int divisor, subdivisor, effectiveBaudRate;
if (baudRate > 3500000) {
throw new IOException("Baud rate to high");
throw new UnsupportedOperationException("Baud rate to high");
} else if(baudRate >= 2500000) {
divisor = 0;
subdivisor = 0;
@@ -191,13 +191,13 @@ public class FtdiSerialDriver implements UsbSerialDriver {
subdivisor = divisor & 0x07;
divisor >>= 3;
if (divisor > 0x3fff) // exceeds bit 13 at 183 baud
throw new IOException("Baud rate to low");
throw new UnsupportedOperationException("Baud rate to low");
effectiveBaudRate = (24000000 << 1) / ((divisor << 3) + subdivisor);
effectiveBaudRate = (effectiveBaudRate +1) >> 1;
}
double baudRateError = Math.abs(1.0 - (effectiveBaudRate / (double)baudRate));
if(baudRateError >= 0.031) // can happen only > 1.5Mbaud
throw new IOException(String.format("baud rate deviation %.1f%% is higher than allowed 3%%", baudRateError*100));
throw new UnsupportedOperationException(String.format("Baud rate deviation %.1f%% is higher than allowed 3%%", baudRateError*100));
int value = divisor;
int index = 0;
switch(subdivisor) {
usbSerialForAndroid/src/main/java/com/hoho/android/usbserial/driver/ProlificSerialDriver.java
+43 -13
View File
@@ -19,6 +19,7 @@ import android.util.Log;
import com.hoho.android.usbserial.BuildConfig;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumSet;
import java.util.LinkedHashMap;
@@ -34,7 +35,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
28800, 38400, 57600, 115200, 128000, 134400, 161280, 201600, 230400, 268800,
403200, 460800, 614400, 806400, 921600, 1228800, 2457600, 3000000, 6000000
};
private enum DeviceType { DEVICE_TYPE_01, DEVICE_TYPE_HX};
private final UsbDevice mDevice;
private final UsbSerialPort mPort;
@@ -89,11 +90,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
private static final int STATUS_BUFFER_SIZE = 10;
private static final int STATUS_BYTE_IDX = 8;
private static final int DEVICE_TYPE_HX = 0;
private static final int DEVICE_TYPE_0 = 1;
private static final int DEVICE_TYPE_1 = 2;
private int mDeviceType = DEVICE_TYPE_HX;
private DeviceType mDeviceType = DeviceType.DEVICE_TYPE_HX;
private UsbEndpoint mInterruptEndpoint;
private int mControlLinesValue = 0;
private int mBaudRate = -1, mDataBits = -1, mStopBits = -1, mParity = -1;
@@ -172,7 +169,7 @@ public class ProlificSerialDriver implements UsbSerialDriver {
vendorIn(0x8383, 0, 1);
vendorOut(0, 1, null);
vendorOut(1, 0, null);
vendorOut(2, (mDeviceType == DEVICE_TYPE_HX) ? 0x44 : 0x24, null);
vendorOut(2, (mDeviceType == DeviceType.DEVICE_TYPE_HX) ? 0x44 : 0x24, null);
}
private void setControlLines(int newControlLinesValue) throws IOException {
@@ -272,22 +269,22 @@ public class ProlificSerialDriver implements UsbSerialDriver {
}
if (mDevice.getDeviceClass() == 0x02) {
mDeviceType = DEVICE_TYPE_0;
mDeviceType = DeviceType.DEVICE_TYPE_01;
} else {
byte[] rawDescriptors = connection.getRawDescriptors();
if(rawDescriptors == null || rawDescriptors.length <8) {
Log.w(TAG, "Could not get device descriptors, Assuming that it is a HX device");
mDeviceType = DEVICE_TYPE_HX;
mDeviceType = DeviceType.DEVICE_TYPE_HX;
} else {
byte maxPacketSize0 = rawDescriptors[7];
if (maxPacketSize0 == 64) {
mDeviceType = DEVICE_TYPE_HX;
mDeviceType = DeviceType.DEVICE_TYPE_HX;
} else if ((mDevice.getDeviceClass() == 0x00)
|| (mDevice.getDeviceClass() == 0xff)) {
mDeviceType = DEVICE_TYPE_1;
mDeviceType = DeviceType.DEVICE_TYPE_01;
} else {
Log.w(TAG, "Could not detect PL2303 subtype, Assuming that it is a HX device");
mDeviceType = DEVICE_TYPE_HX;
mDeviceType = DeviceType.DEVICE_TYPE_HX;
}
}
}
@@ -328,7 +325,40 @@ public class ProlificSerialDriver implements UsbSerialDriver {
return baudRate;
}
}
throw new UnsupportedOperationException("Unsupported baud rate: " + baudRate);
/*
* Formula taken from Linux + FreeBSD.
* baudrate = baseline / (mantissa * 4^exponent)
* where
* mantissa = buf[8:0]
* exponent = buf[11:9]
*
* Note: The formula does not work for all PL2303 variants.
* Ok for PL2303HX. Not ok for PL2303TA. Other variants unknown.
*/
int baseline, mantissa, exponent;
baseline = 12000000 * 32;
mantissa = baseline / baudRate;
if (mantissa == 0) { // > unrealistic 384 MBaud
throw new UnsupportedOperationException("Baud rate to high");
}
exponent = 0;
while (mantissa >= 512) {
if (exponent < 7) {
mantissa >>= 2; /* divide by 4 */
exponent++;
} else { // < 45.8 baud
throw new UnsupportedOperationException("Baud rate to low");
}
}
int effectiveBaudRate = (baseline / mantissa) >> (exponent << 1);
double baudRateError = Math.abs(1.0 - (effectiveBaudRate / (double)baudRate));
if(baudRateError >= 0.031) // > unrealistic 11.6 Mbaud
throw new UnsupportedOperationException(String.format("Baud rate deviation %.1f%% is higher than allowed 3%%", baudRateError*100));
int buf = mantissa + (exponent<<9) + (1<<31);
Log.d(TAG, String.format("baud rate=%d, effective=%d, error=%.1f%%, value=0x%08x, mantissa=%d, exponent=%d",
baudRate, effectiveBaudRate, baudRateError*100, buf, mantissa, exponent));
return buf;
}
@Override