1 | /* |
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2 | * This file contains the TTY driver for the serial ports on the erc32. |
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3 | * |
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4 | * This driver uses the termios pseudo driver. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.OARcorp.com/rtems/license.html. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #include <bsp.h> |
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17 | #include <rtems/libio.h> |
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18 | #include <stdlib.h> |
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19 | #include <assert.h> |
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20 | |
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21 | /* |
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22 | * console_outbyte_polled |
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23 | * |
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24 | * This routine transmits a character using polling. |
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25 | */ |
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26 | |
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27 | void console_outbyte_polled( |
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28 | int port, |
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29 | char ch |
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30 | ) |
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31 | { |
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32 | if ( port == 0 ) { |
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33 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) == 0 ); |
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34 | ERC32_MEC.UART_Channel_A = (int) ch; |
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35 | return; |
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36 | } |
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37 | |
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38 | while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) == 0 ); |
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39 | ERC32_MEC.UART_Channel_B = (int) ch; |
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40 | } |
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41 | |
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42 | /* |
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43 | * console_inbyte_nonblocking |
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44 | * |
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45 | * This routine polls for a character. |
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46 | */ |
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47 | |
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48 | int console_inbyte_nonblocking( int port ) |
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49 | { |
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50 | int UStat; |
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51 | |
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52 | UStat = ERC32_MEC.UART_Status; |
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53 | |
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54 | switch (port) { |
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55 | |
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56 | case 0: |
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57 | if (UStat & ERC32_MEC_UART_STATUS_ERRA) { |
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58 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA; |
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59 | ERC32_MEC.Control = ERC32_MEC.Control; |
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60 | } |
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61 | |
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62 | if ((UStat & ERC32_MEC_UART_STATUS_DRA) == 0) |
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63 | return -1; |
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64 | return (int) ERC32_MEC.UART_Channel_A; |
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65 | return 1; |
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66 | |
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67 | case 1: |
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68 | if (UStat & ERC32_MEC_UART_STATUS_ERRB) { |
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69 | ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB; |
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70 | ERC32_MEC.Control = ERC32_MEC.Control; |
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71 | } |
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72 | |
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73 | if ((UStat & ERC32_MEC_UART_STATUS_DRB) == 0) |
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74 | return -1; |
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75 | return (int) ERC32_MEC.UART_Channel_B; |
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76 | |
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77 | default: |
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78 | assert( 0 ); |
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79 | } |
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80 | |
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81 | return -1; |
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82 | } |
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83 | |
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84 | /* |
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85 | * DEBUG_puts |
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86 | * |
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87 | * This should be safe in the event of an error. It attempts to insure |
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88 | * that no TX empty interrupts occur while it is doing polled IO. Then |
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89 | * it restores the state of that external interrupt. |
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90 | * |
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91 | * Input parameters: |
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92 | * string - pointer to debug output string |
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93 | * |
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94 | * Output parameters: NONE |
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95 | * |
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96 | * Return values: NONE |
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97 | */ |
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98 | |
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99 | void DEBUG_puts( |
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100 | char *string |
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101 | ) |
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102 | { |
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103 | char *s; |
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104 | unsigned32 old_level; |
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105 | |
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106 | ERC32_Disable_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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107 | for ( s = string ; *s ; s++ ) |
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108 | console_outbyte_polled( 0, *s ); |
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109 | |
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110 | console_outbyte_polled( 0, '\r' ); |
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111 | console_outbyte_polled( 0, '\n' ); |
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112 | ERC32_Restore_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level ); |
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113 | } |
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