com.hoho.android.usbserial.driver.Cp21xxSerialDriver Java Examples

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Example #1

Source File: DeviceTest.java From usb-serial-for-android with GNU Lesser General Public License v2.1

4 votes

@Test
public void purgeHwBuffers() throws Exception {
    // purge write buffer
    // 2400 is slowest baud rate for isCp21xxRestrictedPort
    usbOpen();
    usbParameters(2400, 8, 1, UsbSerialPort.PARITY_NONE);
    telnetParameters(2400, 8, 1, UsbSerialPort.PARITY_NONE);
    byte[] buf = new byte[64];
    for(int i=0; i<buf.length; i++) buf[i]='a';
    StringBuilder data = new StringBuilder();

    usbWrite(buf);
    Thread.sleep(50); // ~ 12 bytes
    boolean purged = usbSerialPort.purgeHwBuffers(true, false);
    usbWrite("bcd".getBytes());
    Thread.sleep(50);
    while(data.length()==0 || data.charAt(data.length()-1)!='d')
        data.append(new String(telnetRead()));
    Log.i(TAG, "purgeHwBuffers " + purged + ": " + buf.length+1 + " -> " + data.length());

    assertTrue(data.length() > 5);
    if(purged)
        assertTrue(data.length() < buf.length+1);
    else
        assertEquals(data.length(), buf.length + 3);

    // purge read buffer
    usbClose();
    usbOpen(EnumSet.of(UsbOpenFlags.NO_IOMANAGER_THREAD));
    usbParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
    telnetParameters(19200, 8, 1, UsbSerialPort.PARITY_NONE);
    telnetWrite("x".getBytes());
    Thread.sleep(10); // ~ 20 bytes
    purged = usbSerialPort.purgeHwBuffers(false, true);
    Log.d(TAG, "purged = " + purged);
    telnetWrite("y".getBytes());
    Thread.sleep(10); // ~ 20 bytes
    if(purged) {
        if(usbSerialDriver instanceof Cp21xxSerialDriver) { // only working on some devices/ports
            if(isCp21xxRestrictedPort) {
                assertThat(usbRead(2), equalTo("xy".getBytes())); // cp2105/1
            } else if(usbSerialDriver.getPorts().size() > 1) {
                assertThat(usbRead(1), equalTo("y".getBytes()));  // cp2105/0
            } else {
                assertThat(usbRead(2), equalTo("xy".getBytes())); // cp2102
            }
        } else {
            assertThat(usbRead(1), equalTo("y".getBytes()));
        }
    } else {
        assertThat(usbRead(2), equalTo("xy".getBytes()));
    }
}