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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 56 | johboh | 1 | /********************************************************************* |
| 2 | * |
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| 3 | * UART |
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| 4 | * |
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| 5 | ********************************************************************* |
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| 97 | johboh | 6 | * FileName: $HeadURL: https://svn.auml.se/svn/HomeAutomation/branches/modules/EmbeddedSoftware/PIC/canToSerial/Source/uart.c $ |
| 7 | * Last changed: $LastChangedDate: 2006-11-14 21:22:17 +0100 (Tue, 14 Nov 2006) $ |
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| 8 | * By: $LastChangedBy: johboh $ |
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| 9 | * Revision: $Revision: 97 $ |
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| 56 | johboh | 10 | ********************************************************************/ |
| 11 | |||
| 12 | #include <uart.h> |
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| 13 | #include <stackTasks.h> |
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| 14 | |||
| 15 | #ifdef USE_UART |
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| 16 | |||
| 17 | static char uartBusy(void); |
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| 18 | |||
| 19 | |||
| 20 | /* |
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| 21 | * Function: uartInit |
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| 22 | * |
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| 23 | * Input: none |
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| 24 | * Output: none |
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| 25 | * Pre-conditions: none |
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| 26 | * Affects: none |
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| 27 | * Depends: none |
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| 28 | */ |
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| 29 | void uartInit() |
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| 30 | { |
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| 31 | // Configure USART |
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| 32 | TRISCbits.TRISC7=1; |
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| 33 | TRISCbits.TRISC6=0; |
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| 64 | johboh | 34 | TXSTA=0b00100000; |
| 35 | #ifdef HIGH_BRG |
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| 36 | TXSTAbits.BRGH=1; // High BRG speed |
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| 37 | BAUDCONbits.BRG16=1; |
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| 38 | SPBRGH = SPBRGH_VAL; |
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| 39 | SPBRG = SPBRG_VAL; |
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| 40 | #else |
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| 41 | TXSTAbits.BRGH=0; // Low BRG speed |
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| 42 | SPBRG = SPBRG_VAL; |
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| 43 | #endif |
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| 44 | |||
| 56 | johboh | 45 | RCSTA=0b10010000; |
| 64 | johboh | 46 | |
| 56 | johboh | 47 | // USART RX interrupt |
| 48 | PIR1bits.RCIF=0; |
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| 49 | PIE1bits.RCIE=1; |
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| 50 | // High interrupt |
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| 51 | IPR1bits.RCIP=1; |
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| 52 | } |
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| 53 | |||
| 54 | |||
| 55 | /* |
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| 56 | * Function: uartPutc |
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| 57 | * |
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| 58 | * Input: BYTE c to send on uart |
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| 59 | * Output: none |
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| 60 | * Pre-conditions: call to uartInit() |
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| 61 | * Affects: none |
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| 62 | * Depends: none |
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| 63 | */ |
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| 64 | void uartPutc(BYTE c) |
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| 65 | { |
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| 66 | // Write the data byte to the USART |
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| 67 | TXREG = c; |
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| 68 | while(uartBusy()); |
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| 69 | } |
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| 70 | |||
| 71 | |||
| 72 | /* |
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| 73 | * Function: uartPuts |
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| 74 | * |
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| 75 | * Input: Byte array to send on uart |
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| 76 | * Output: none |
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| 77 | * Pre-conditions: call to uartInit() |
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| 78 | * Affects: none |
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| 79 | * Depends: none |
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| 80 | */ |
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| 81 | void uartPuts(BYTE c[]) |
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| 82 | { |
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| 83 | do |
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| 84 | { // Transmit a byte |
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| 85 | while(uartBusy()); |
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| 86 | uartPutc(*c); |
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| 87 | } while( *c++ ); |
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| 88 | } |
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| 89 | |||
| 90 | /* |
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| 91 | * Function: uartPutrs |
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| 92 | * |
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| 93 | * Input: Byte array to send on uart (static) |
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| 94 | * Output: none |
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| 95 | * Pre-conditions: call to uartInit() |
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| 96 | * Affects: none |
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| 97 | * Depends: none |
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| 98 | */ |
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| 99 | void uartPutrs(const rom char *c) |
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| 100 | { |
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| 101 | do |
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| 102 | { // Transmit a byte |
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| 103 | while(uartBusy()); |
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| 104 | uartPutc(*c); |
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| 105 | } while( *c++ ); |
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| 106 | } |
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| 107 | |||
| 108 | |||
| 109 | |||
| 110 | |||
| 111 | /* |
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| 112 | * Function: uartBusy |
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| 113 | * |
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| 114 | * Input: none. |
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| 115 | * Output: If usart busy or not. |
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| 116 | * Pre-conditions: call to uartInit() |
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| 117 | * Affects: none |
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| 118 | * Depends: none |
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| 119 | */ |
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| 120 | char uartBusy(void) |
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| 121 | { |
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| 122 | return !TXSTAbits.TRMT; |
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| 123 | } |
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| 124 | |||
| 125 | |||
| 126 | /* |
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| 127 | * Function: uartGet |
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| 128 | * |
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| 129 | * Input: none |
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| 130 | * Output: Byte read |
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| 131 | * Pre-conditions: call to uartInit() |
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| 132 | * Affects: none |
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| 133 | * Depends: none. |
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| 134 | */ |
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| 135 | BYTE uartGet(void) |
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| 136 | { |
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| 137 | // Return the received data |
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| 138 | return RCREG; |
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| 139 | } |
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| 140 | |||
| 141 | |||
| 142 | /* |
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| 143 | * Function: uartISR |
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| 144 | * |
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| 145 | * Input: none |
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| 146 | * Output: none |
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| 147 | * Pre-conditions: call to uartInit() |
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| 148 | * Affects: call to uartParse |
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| 149 | * Depends: none. |
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| 150 | */ |
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| 151 | void uartISR(void) |
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| 152 | { |
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| 153 | if (PIR1bits.RCIF==1 && PIE1bits.RCIE==1) |
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| 154 | { |
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| 155 | if (RCSTAbits.OERR) { RCSTAbits.CREN=0; RCSTAbits.CREN=1; } |
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| 156 | |||
| 157 | uartParse(uartGet()); |
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| 158 | PIR1bits.RCIF=0; |
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| 159 | } |
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| 160 | } |
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| 161 | |||
| 162 | |||
| 163 | /* |
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| 164 | * Function: uartDataRedy |
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| 165 | * |
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| 166 | * Input: none. |
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| 167 | * Output: If usart data are redy to be read. |
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| 168 | * Pre-conditions: call to uartInit() |
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| 169 | * Affects: none |
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| 170 | * Depends: none |
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| 171 | */ |
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| 172 | char uartDataRedy(void) |
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| 173 | { |
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| 174 | if(RCSTAbits.OERR) |
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| 175 | { |
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| 176 | RCSTAbits.CREN = 0; |
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| 177 | RCSTAbits.CREN = 1; |
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| 178 | } |
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| 179 | return PIR1bits.RCIF; |
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| 180 | } |
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| 181 | |||
| 182 | #endif |