Ofxserial high baud rate problem with arduino

@SB_LEE wrote:

Hi.
I’m currently using ofxserial add-on to communicate with arduino uno to high baud_rate
which is 2,000,000(2M).
Before I use ofx, I made my test example in processing 3.02 and It worked well.
When I run ofx version of this example at this baud rate however, I cannot get any response from arduino.
Rx led in arduino still blinks but Tx does not.
BUT when I run same example at baud rate 230400 or below, arduino sends me back values.

I’m currently using OS X EL CAPITAN 10.11.5(15F34) and Xcode 7.3.1 (7D1014).

How can I use that baud rate (2M) in ofxserial?

Any help would be appreciated.Thanks !

OFX CODE
//--------------------------------------------------------------
void ofApp::setup(){

ofBackground(0);

std::vector<ofx::IO::SerialDeviceInfo> devicesInfo = ofx::IO::SerialDeviceUtils::listDevices();

ofLogNotice("ofApp::setup") << "Connected Devices: ";

for (std::size_t i = 0; i < devicesInfo.size(); ++i)
{
    ofLogNotice("ofApp::setup") << "\t" << devicesInfo[i];
}

int baud = 2000000;

if (!devicesInfo.empty())
{
    // Connect to the first matching device.
    bool success = device.setup(devicesInfo[0], baud);

    if(success)
    {
        ofLogNotice("ofApp::setup") << "Successfully setup " << devicesInfo[0];
        ofLogNotice("ofApp::setup") << "BAUDRATE : " << device.getBauds();
        ofLogNotice("ofApp::setup") << "Device Info : " << devicesInfo[0];
    }
    else
    {
        ofLogNotice("ofApp::setup") << "Unable to setup " << devicesInfo[0];
    }
}
else
{
    ofLogNotice("ofApp::setup") << "No devices connected.";
}

}

//--------------------------------------------------------------
void ofApp::update(){

try
{
    while (device.available() > 0)
    {
        sz = device.readByte(val1);
        receiveVal = val1;

    }
    device.writeByte(sendVal);
    sendVal++;

    if(sendVal > 255)
    {
        sendVal = 0;
    }
}
catch (const std::exception& exc)
{
    ofLogError("ofApp::update") << exc.what();
}

}

//--------------------------------------------------------------
void ofApp::draw(){

ofSetColor(255, 255, 255);
ofDrawBitmapString("SIZE: " + ofToString(sz), 0, 220);
ofDrawBitmapString("VAL : " + ofToString((int)val1), 0, 290);
ofDrawBitmapString("ReceiveVal : " + ofToString(receiveVal), 0, 360);

}

ARDUINO CODE

volatile uint8_t data;

void setup()
{
UART_init();
}

ISR (USART_RX_vect) {
data = UDR0;
UDR0 = data;
return;
}

void loop()
{

}

void UART_init() {
//*****************************UART initialisation*****************************//
UCSR0A |= (1 << U2X0); // Double up UART //
UCSR0B |= (1 << RXEN0) | (1 << TXEN0) | (1 << RXCIE0); // UART RX, TX enable //
// RX Interrupt enable //
UCSR0C |= (1 << UCSZ01) | (1 << UCSZ00); // Asynchrous 8N1 //
UBRR0H = 0; //
UBRR0L = 0; // Baud Rate 2 MBit //
//*****************************UART initialisation*****************************//
}

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