| 1 | /************************************************************************* |
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| 2 | ** |
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| 3 | ** Broadcom Corp. Confidential |
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| 4 | ** Copyright 1999, 2000 Broadcom Corp. All Rights Reserved. |
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| 5 | ** |
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| 6 | ** THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE |
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| 7 | ** AGREEMENT BETWEEN THE USER AND BROADCOM. YOU HAVE NO RIGHT TO USE OR |
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| 8 | ** EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT. |
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| 9 | ** |
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| 10 | ** File: serial.h |
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| 11 | ** Description: polled uart io |
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| 12 | ** Created: Jeff Fisher |
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| 13 | ** REVISION: |
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| 14 | ** |
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| 15 | ****************************************************************************/ |
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| 16 | |
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| 17 | #include "serial.h" |
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| 18 | |
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| 19 | /***********************************************************************/ |
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| 20 | /* serial_init(UartChannel *uart,unsigned int baud)*/ |
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| 21 | /***********************************************************************/ |
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| 22 | void serial_init(volatile UartChannel *uart, unsigned int baud) |
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| 23 | { |
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| 24 | #if (BCHP_CHIP==7550) |
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| 25 | uart->sdw_lsr = 0; |
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| 26 | #else |
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| 27 | /*---------------------------------------------------------------------*/ |
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| 28 | /* Dissable channel's receiver and transmitter. */ |
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| 29 | /*---------------------------------------------------------------------*/ |
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| 30 | uart->control = 0; |
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| 31 | // uart->control &= ~(TXEN|RXEN); |
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| 32 | |
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| 33 | /*---------------------------------------------------------------------*/ |
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| 34 | /* disable interrupts on this channel . */ |
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| 35 | /*---------------------------------------------------------------------*/ |
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| 36 | uart->rxstat = 0; |
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| 37 | uart->txstat = 0; |
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| 38 | |
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| 39 | /*-----------------------------------------------------------------*/ |
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| 40 | /* set character size and parity control bit (8,none only) */ |
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| 41 | /*-----------------------------------------------------------------*/ |
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| 42 | uart->control = BITM8; |
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| 43 | baud = ((XTALFREQ / baud) /16); |
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| 44 | uart->baudh = (unsigned char)((baud >> 8) & 0xFF); |
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| 45 | uart->baudl = (unsigned char)(baud & 0xFF); |
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| 46 | |
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| 47 | /*---------------------------------------------------------------------*/ |
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| 48 | /* Finally, re-enable the transmitter and receiver. */ |
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| 49 | /*---------------------------------------------------------------------*/ |
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| 50 | uart->control |= (TXEN|RXEN); |
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| 51 | #endif |
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| 52 | } |
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| 53 | |
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| 54 | /***********************************************************************/ |
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| 55 | /* serial_getc(UartChannel *uart, int block)*/ |
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| 56 | /***********************************************************************/ |
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| 57 | #define RXRDA 0x01 |
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| 58 | #define RXOVFERR 0x02 |
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| 59 | #define RXPARERR 0x04 |
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| 60 | #define RXFRAMERR 0x08 |
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| 61 | #define RXBIERR 0x10 /* BI error */ |
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| 62 | #define RXFIFOERR 0x80 /* Rx FIFO error */ |
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| 63 | int serial_getc(volatile UartChannel *uart, bool block) |
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| 64 | { |
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| 65 | #if (BCHP_CHIP==7550) |
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| 66 | int blen = 1; |
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| 67 | unsigned int status; |
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| 68 | char tval; |
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| 69 | |
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| 70 | while (blen > 0) |
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| 71 | { |
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| 72 | status = uart->sdw_lsr; |
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| 73 | if(status & (RXOVFERR | RXPARERR | RXFRAMERR | RXBIERR | RXFIFOERR)) |
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| 74 | { |
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| 75 | /* Just read the bad character to clear the bit. */ |
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| 76 | tval = uart->sdw_rbr_thr_dll & 0xFF; |
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| 77 | } |
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| 78 | else if(status & RXRDA) |
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| 79 | { |
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| 80 | tval = uart->sdw_rbr_thr_dll & 0xFF; |
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| 81 | blen--; |
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| 82 | } |
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| 83 | else { |
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| 84 | /* block if required */ |
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| 85 | if (!block) { |
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| 86 | return 0; |
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| 87 | } |
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| 88 | } |
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| 89 | } |
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| 90 | return tval; |
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| 91 | #else |
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| 92 | if (!block) |
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| 93 | { |
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| 94 | if (!(uart->rxstat & RXDATARDY)) { |
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| 95 | return 0; |
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| 96 | } |
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| 97 | } |
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| 98 | while (!(uart->rxstat & RXDATARDY)) ; |
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| 99 | |
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| 100 | return (unsigned char)uart->rxdata; |
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| 101 | #endif |
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| 102 | } |
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| 103 | |
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| 104 | /***********************************************************************/ |
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| 105 | /* serial_putc(UartChannel *uart, unsigned int c)*/ |
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| 106 | /***********************************************************************/ |
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| 107 | static inline void serial_do_putc(volatile UartChannel *uart, int c) |
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| 108 | { |
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| 109 | #if (BCHP_CHIP==7550) |
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| 110 | while (!(uart->sdw_lsr & THRE)) |
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| 111 | ; |
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| 112 | |
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| 113 | uart->sdw_rbr_thr_dll = (unsigned char)c; |
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| 114 | #else |
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| 115 | while (!(uart->txstat & TXDREGEMT)) |
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| 116 | ; |
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| 117 | |
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| 118 | uart->txdata = (unsigned char)c; |
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| 119 | #endif |
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| 120 | } |
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| 121 | |
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| 122 | /***********************************************************************/ |
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| 123 | /* serial_putc(UartChannel *uart, unsigned int c)*/ |
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| 124 | /***********************************************************************/ |
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| 125 | void serial_putc(volatile UartChannel *uart, int c) |
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| 126 | { |
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| 127 | serial_do_putc(uart,c); |
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| 128 | } |
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| 129 | |
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