forked from Imagelibrary/rtems
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* COPYRIGHT (c) 2010.
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* Cobham Gaisler AB.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#include <grlib/apbuart.h>
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void apbuart_outbyte_polled(
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struct apbuart_regs *regs,
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unsigned char ch,
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int do_cr_on_newline,
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int wait_sent
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)
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{
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send:
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while ( (regs->status & APBUART_STATUS_TE) == 0 ) {
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/* Lower bus utilization while waiting for UART */
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__asm__ volatile ("nop"::); __asm__ volatile ("nop"::);
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__asm__ volatile ("nop"::); __asm__ volatile ("nop"::);
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__asm__ volatile ("nop"::); __asm__ volatile ("nop"::);
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__asm__ volatile ("nop"::); __asm__ volatile ("nop"::);
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}
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if ((ch == '\n') && do_cr_on_newline) {
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regs->data = (unsigned int) '\r';
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do_cr_on_newline = 0;
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goto send;
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}
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regs->data = (unsigned int) ch;
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/* Wait until the character has been sent? */
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if (wait_sent) {
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while ((regs->status & APBUART_STATUS_TE) == 0)
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;
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}
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}
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int apbuart_inbyte_nonblocking(struct apbuart_regs *regs)
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{
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/* Clear errors */
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if (regs->status & APBUART_STATUS_ERR)
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regs->status = ~APBUART_STATUS_ERR;
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if ((regs->status & APBUART_STATUS_DR) == 0)
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return -1;
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else
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return (int) regs->data;
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}
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