CPU.installVP() & CPU.removeVP() Not Working

newnapman · 2005-08-16 20:41

I have a UART object that reads in serial data. After it is declared in code (and automatically installed), it ALWAYS works.

If I place a removeVP() & installVP() (As showen in the "Javelin Stamp Hardware Refernce" P. 165) before using the object, then the UART no longer works. HELP.

Working Code:

...
static Uart Uart_rx = new Uart( Uart.dirReceive,  CPU.pin3, Uart.dontInvert, Uart.speed9600, Uart.stop1 );
...
public static void main() {
  ...
  if ( Uart_rx.byteAvailable() ) {
    System.out.println(Uart_rx.receiveByte());
  }
  ...
}
...

NOT Working Code (There is never a byte available):

...
static Uart Uart_rx = new Uart( Uart.dirReceive,  CPU.pin3, Uart.dontInvert, Uart.speed9600, Uart.stop1 );
...
public static void main() {
  ...
  CPU.removeVP(Uart_rx);
  CPU.installVP(Uart_rx);
  ...
  if ( Uart_rx.byteAvailable() ) {
    System.out.println(Uart_rx.receiveByte());
  }
  ...
}
...

Please help... What is wrong?

Peter Verkaik · 2005-08-16 22:56

Use Uart_rx.stop() to stop the uart (and remove vp),

use Uart_rx.start() to start the Uart (and install vp).

The start() method initializes all necessary Uart registers.

regards peter

CPU.installVP() & CPU.removeVP() Not Working

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