Hello, the UART/USART of the ATSAM doesn't have any FIFO buffer. Therefore every received character has to be processed before the next one arrives. In situations with a high interrupt load or during long interrupt locks, this might not work reliable and the UART/USART can loose characters.
This patch set first merges the USART and UART code on the ATSAM. The code was identical except for very few lines. After that it adds an option to enable a DMA for the Rx path. The DMA is a limited resource on this chip so I didn't enable the usage of the DMA by default. It has to be explicitly enabled with an ioctl call on an opened port. With that existing applications shouldn't note a difference and applications that have difficult load situations can enable the DMA. The problem exists in 5 and 6. I would like to add the patch for both branches (tickets #4577 and #4578). Best regards Christian _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
