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1 | /* |
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2 | * COPYRIGHT (c) 2010. |
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3 | * Cobham Gaisler AB. |
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4 | * |
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5 | * The license and distribution terms for this file may be |
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6 | * found in the file LICENSE in this distribution or at |
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7 | * http://www.rtems.org/license/LICENSE. |
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8 | */ |
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9 | |
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10 | #include <grlib/apbuart.h> |
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11 | |
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12 | void apbuart_outbyte_polled( |
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13 | struct apbuart_regs *regs, |
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14 | unsigned char ch, |
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15 | int do_cr_on_newline, |
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16 | int wait_sent |
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17 | ) |
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18 | { |
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19 | send: |
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20 | while ( (regs->status & APBUART_STATUS_TE) == 0 ) { |
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21 | /* Lower bus utilization while waiting for UART */ |
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22 | __asm__ volatile ("nop"::); __asm__ volatile ("nop"::); |
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23 | __asm__ volatile ("nop"::); __asm__ volatile ("nop"::); |
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24 | __asm__ volatile ("nop"::); __asm__ volatile ("nop"::); |
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25 | __asm__ volatile ("nop"::); __asm__ volatile ("nop"::); |
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26 | } |
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27 | |
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28 | if ((ch == '\n') && do_cr_on_newline) { |
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29 | regs->data = (unsigned int) '\r'; |
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30 | do_cr_on_newline = 0; |
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31 | goto send; |
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32 | } |
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33 | regs->data = (unsigned int) ch; |
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34 | |
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35 | /* Wait until the character has been sent? */ |
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36 | if (wait_sent) { |
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37 | while ((regs->status & APBUART_STATUS_TE) == 0) |
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38 | ; |
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39 | } |
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40 | } |
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41 | |
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42 | int apbuart_inbyte_nonblocking(struct apbuart_regs *regs) |
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43 | { |
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44 | /* Clear errors */ |
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45 | if (regs->status & APBUART_STATUS_ERR) |
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46 | regs->status = ~APBUART_STATUS_ERR; |
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47 | |
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48 | if ((regs->status & APBUART_STATUS_DR) == 0) |
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49 | return -1; |
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50 | else |
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51 | return (int) regs->data; |
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52 | } |
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