Lpc2000

If the interrupt structure is anything like other micros you need to 
disable any pending interrupt flags before re-enabling the interrupt, 
since, whatever is causing the pulse (and I assume its caused by 
switching the RS485 pins together) has caused a pulse anyway while ints 
were disabled, and this has not yet been cleared.

Al

Richard wrote:

> 
> I am driving a 485 transceiver (SN65HVD10) with the LPC2104.  The
> RE/ and DE lines are tied together and to a GPIO pin for direction
> selection.  My problem is that when I enable transmission the bus is
> driven low and a pulse is seen at my RXD input causing an
> interrupt.  I have tried disabling the UART1 interrupt before I
> toggle the direction pins of the 485 transceiver but the receive
> interrupt fires off as soon as I enable the UART interrupts again. 
> Tying the direction pins of the tranceiver results in a race
> condition so I have added a small delay to let the pins settle.
> 
> Thanks for the help
> 
> Richard
> 
> 
> 
> 
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