Other Trying to add SetRTS functionality to USBSerial library

[sunish]

Iam not very familiar with Java and its libraries in B4a.

Iam trying to modify the USBSerial library to support flow control for CP2102. There is a function definition in Cp2102SerialDriver.java called public void setRTS(boolean value). I tried adding
setConfigSingle(SILABSER_SET_MHS_REQUEST_CODE, MCR_ALL | CONTROL_WRITE_DTR | CONTROL_WRITE_RTS | MCR_RTS);

Compiled the library using SimpleLibraryCompiler and got it into b4a and then tried invoking the function through reflection. But I am not sure whether the code is getting executed. I tried adding Log.d to the function but its not appearing in the B4a logs.

Would like to know how to add to the B4a logs from a library and whether this is the right way of adding the SetRTS function.

 

[Erel]

Use the unmodified library:

Dim r As Reflector
r.Target = UsbSerial1
Dim driver As JavaObject = r.GetField("driver")
driver.RunMethod("setRTS", Array(True))

 

[sunish]

Use the unmodified library:

Dim r As Reflector
r.Target = UsbSerial1
Dim driver As JavaObject = r.GetField("driver")
driver.RunMethod("setRTS", Array(True))

No change in RTS status with
driver.RunMethod("setRTS", Array(True)) or
driver.RunMethod("setRTS", Array(False))

My doubt is that without implementing the function in the library, will this code have any effect ? It seems to be implemented in the Prolific driver, but not in ftdi and Silicon labs, CP2102 which I use for testing.

Sunish

 

[Erel]

The code I posted will call driver.SetRTS. The actual driver method will be called as a result.

 

[sunish]

In the source files of the usbserial library the java file for prolific (..USB_Serial_2.4\src\com\hoho\android\usbserial\driver\ProlificSerialDriver.java) has

 @Override
    public void setRTS(boolean value) throws IOException {
        mRts = value;
        setDtrRts();
    }

but for CP2102(..USB_Serial_2.4\src\com\hoho\android\usbserial\driver\Cp2102SerialDriver.java) just has

@Override
    public void setRTS(boolean value) throws IOException {
    }

The SetRTS function is not implemented in the driver I guess. I was attempting to do that by referring to the C implementation at http://lxr.free-electrons.com/source/drivers/usb/serial/cp210x.c#L283

But I was not able to ensure the function in my modified java driver is getting executed as I was not able to get anything in the debug logs using Log.d.

Sunish

 

[Erel]

The SetRTS function is not implemented in the driver I guess.

This is correct.

Use BA.Log to write to the logs.