Changeset 188c76c in mainline

Timestamp:

2012-08-13T22:59:29Z (12 years ago)

Author:

Martin Sucha <sucha14@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

fd418d9

Parents:

e0cd9042

Message:

ns8250: Use 4-byte interrupt threshold to make buffer overruns less likely.

File:

• uspace/drv/char/ns8250/ns8250.c (modified) (1 diff)

uspace/drv/char/ns8250/ns8250.c

@@ -706 +706 @@
         /* 8 bits, no parity, two stop bits. */
         ns8250_port_set_com_props(ns->regs, SERIAL_NO_PARITY, 8, 2);
-        /* Enable FIFO, clear them, with 14-byte threshold. */
+        /*
+         * Enable FIFO, clear them, with 4-byte threshold for greater
+         * reliability.
+         */
         pio_write_8(&ns->regs->iid, NS8250_FCR_FIFOENABLE
-            | NS8250_FCR_RXFIFORESET | NS8250_FCR_TXFIFORESET 
-            | NS8250_FCR_RXTRIGGERLOW | NS8250_FCR_RXTRIGGERHI);
+            | NS8250_FCR_RXFIFORESET | NS8250_FCR_TXFIFORESET
+            | NS8250_FCR_RXTRIGGERLOW);
         /*
          * RTS/DSR set (Request to Send and Data Terminal Ready lines enabled),