[1d1b1507] | 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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[08311cc3] | 6 | * COPYRIGHT (c) 1989-1999. |
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[1d1b1507] | 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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