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LEON3: console, lower bus utilization waiting for UART TX ready

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Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
This commit is contained in:
Daniel Hellstrom
2012-04-19 15:21:20 +02:00
committed by Gedare Bloom
parent 5c51ba1333
commit 6845f8005c
1 changed files with 7 additions and 3 deletions
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10
c/src/lib/libbsp/sparc/leon3/console/debugputs.c
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@@ -13,8 +13,6 @@
* The license and distribution terms for this file may be * The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at * found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE. * http://www.rtems.com/license/LICENSE.
*
* $Id$
*/ */
#include <bsp.h> #include <bsp.h>
@@ -94,7 +92,13 @@ void apbuart_outbyte_polled(
unsigned char ch unsigned char ch
) )
{ {
while ( (regs->status & LEON_REG_UART_STATUS_THE) == 0 ); while ( (regs->status & LEON_REG_UART_STATUS_THE) == 0 ) {
/* Lower bus utilization while waiting for UART */
asm volatile ("nop"::); asm volatile ("nop"::);
asm volatile ("nop"::); asm volatile ("nop"::);
asm volatile ("nop"::); asm volatile ("nop"::);
asm volatile ("nop"::); asm volatile ("nop"::);
}
regs->data = (unsigned int) ch; regs->data = (unsigned int) ch;
} }