Missing data in UART RX

Hi all, I am implementing a port to At91sam7se512. I have create 3 tasks, one for UART received data handling, one for key board and one for applcation. My problem is I found that the UART RX has missed some data. This looks like the system has missed some interrupts. Will this happen in tasks switching? Does anyone have any idea?? Thanks & Regards, CPKwok

Missing data in UART RX

Strange cause I as well am experiancing simular issues. I can receive data in sometimes and send data out but it seems after awhile it locks up the device. Not sure why.

Missing data in UART RX

Using sam7s sending lots with uart using DMA on transmit and rec and semaphre to trigger tasks. Working very well not lost chars.

Missing data in UART RX

Thx sotd. I am also using DAM on TX and RX as well, could u tell me more about using semaphore to trigger tasks?