RTOS/rtems
1
0
Fork 0
forked from Imagelibrary/rtems
Code Pull Requests Activity

ibchip/ns16550: Minor optimisation.

Browse Source
This commit is contained in:
Chris Johns
2016-04-20 17:12:07 +10:00
parent 03ad2a5a92
commit 8ce75671eb
1 changed files with 14 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
c/src/libchip/serial/ns16550.c
View File

@@ -616,27 +616,28 @@ NS16550_STATIC void ns16550_process( int minor)
NS16550Context *ctx = d->pDeviceContext;
uint32_t port = c->ulCtrlPort1;
getRegister_f get = c->getRegister;
int i = 0;
int i;
char buf [SP_FIFO_SIZE];
/* Iterate until no more interrupts are pending */
do {
/* Fetch received characters */
for (i = 0; i < SP_FIFO_SIZE; ++i) {
if ((get( port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
buf [i] = (char) get(port, NS16550_RECEIVE_BUFFER);
} else {
break;
i = 0;
while ((get(port, NS16550_LINE_STATUS) & SP_LSR_RDY) != 0) {
buf[i++] = (char) get(port, NS16550_RECEIVE_BUFFER);
if (i == SP_FIFO_SIZE) {
/* Enqueue fetched characters */
rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
i = 0;
}
}
/* Enqueue fetched characters */
if (i > 0)
rtems_termios_enqueue_raw_characters( d->termios_data, buf, i);
/* Check if we can dequeue transmitted characters */
if (ctx->transmitFifoChars > 0
&& (get( port, NS16550_LINE_STATUS) & SP_LSR_THOLD) != 0) {
/* Dequeue transmitted characters */
rtems_termios_dequeue_characters(
d->termios_data,