Lpc2000

--- In lpc2000@yahoogroups.com, "vajper0" <ph@w...> wrote:
> I'm writing a driver for UART1 on a LPC2138. So far most things 
seems
> to work (considering the crappy hardware capabilities). My current
> problem is that I loose interrupts when receiving data.
> 
> I run the UART in 115200bps and my ISR takes care of all IRQs except
> the modem status ones that are not enabled. If I send a block of a
> couple of hundreds characters, sometimes one RDA IRQ is lost. I know
> this because the missing data always are the size of the Rx trigger 
level.
> 
> The ISR reads the U1IIR once in the beginning, compares the register
> data to the different IRQ types in priority order. The first 
matching
> type is handled (and the IRQ resetted), the U1IIR is then read again
> and so on. When no more pending IRQs, the ISR is exited. When a 
> 
> Am I missing something essential?

I am also doing the same type of situation on a 2119.  When it works 
it works great but when it doesn't well it just doesn't work.  There 
is errata on the UART1 for the 2119 but I should be working around 
it.  I found that if I could send a continual stream of data and it 
linked from the start it would usually work without issue.  If I 
place the serial link after the fact it only seems to work 1/4 of the 
time if that.

I wish I could be of more help to you other then to say you are not 
the only one and I have been able to reproduce it on a LPC2119.  I am 
very interested in hearing any possible solutions.