i have an issue with the serial port of my ArduinoProMini (16MHz), which i hope might be no big deal for someone with more insight than me…

i am reading serial data from a Spektrum Satellite receiver (16bytes every 22msec), in 115200 baud. to have good accuracy, i used the hardware serial port for this (only RX).

to monitor the data, i use SoftwareSerial (output) via the FTDI (only TX), with 115200 baud, too – works very well!

NOW when i change the baud rate of the SoftwareSerial monitor to 38400 baud (which i will later need to control a Pololu-Servo-Interface-board), the data gets corrupted! that is, you can still recognise the pattern, but there are many damaged or missed bytes.

any idea, comment, help? thanks so much -

jan from berlin

ps. here comes the very simple script that doesn’t work (or does work with MonitorSerial.begin (115200) instead of (38400))…

#include
SoftwareSerial MonitorSerial(5, 6); // serial monitor on Pin 6 (only RX)

// serial data from Satellite receiver is connected to RX1 on the
// ArduinoProMini, 5V, 16MHz, ATmega328; Arduino Software 1.0

int index = 1;
int val[17];
int burp = 0;

void setup()
{
MonitorSerial.begin(38400); // to monitor on screen, or later forward
MonitorSerial.print(“Test”); // processed values to Servo-Interface
MonitorSerial.println(); // with max. baudrate 38400

Serial.begin(115200); // serial data rate of the Spektrum Satellite
}

void loop()
{
if (Serial.available() > 0)
{
val[index]= Serial.read();
if (val [index] == 0×01 && val [index-1] >=0)
{
for (index =0; index <17; index++)
{
MonitorSerial.print(val[index]);
MonitorSerial.print("\t");
}
MonitorSerial.print(burp);
MonitorSerial.println();
index=0;
burp++;
}
index++;
}
}

I would expect that to work with the “true” parameter for inverted logic. Hmm..

With Arduino 1.0 you no longer use the external NewSoftSerial library. It has been renamed “SoftwareSerial” (replacing the old SoftwareSerial) and place in the core.

Thanks