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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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| 6 | * FileName: uart.c |
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| 7 | * |
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| 8 | * Author Date Comment |
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| 9 | *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 10 | * Johan Böhlin 21-10-06 Original (Rev 1.0) |
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| 11 | ********************************************************************/ |
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| 12 | |||
| 13 | #include <uart.h> |
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| 14 | #include <stackTasks.h> |
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| 15 | |||
| 16 | #ifdef USE_UART |
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| 17 | |||
| 18 | static char uartBusy(void); |
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| 19 | |||
| 20 | |||
| 21 | /* |
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| 22 | * Function: uartInit |
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| 23 | * |
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| 24 | * Input: none |
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| 25 | * Output: none |
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| 26 | * Pre-conditions: none |
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| 27 | * Affects: none |
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| 28 | * Depends: none |
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| 29 | */ |
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| 30 | void uartInit() |
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| 31 | { |
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| 32 | // Configure USART |
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| 33 | TRISCbits.TRISC7=1; |
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| 34 | TRISCbits.TRISC6=0; |
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| 64 | johboh | 35 | TXSTA=0b00100000; |
| 36 | #ifdef HIGH_BRG |
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| 37 | TXSTAbits.BRGH=1; // High BRG speed |
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| 38 | BAUDCONbits.BRG16=1; |
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| 39 | SPBRGH = SPBRGH_VAL; |
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| 40 | SPBRG = SPBRG_VAL; |
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| 41 | #else |
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| 42 | TXSTAbits.BRGH=0; // Low BRG speed |
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| 43 | SPBRG = SPBRG_VAL; |
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| 44 | #endif |
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| 45 | |||
| 56 | johboh | 46 | RCSTA=0b10010000; |
| 64 | johboh | 47 | |
| 56 | johboh | 48 | // USART RX interrupt |
| 49 | PIR1bits.RCIF=0; |
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| 50 | PIE1bits.RCIE=1; |
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| 51 | // High interrupt |
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| 52 | IPR1bits.RCIP=1; |
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| 53 | } |
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| 54 | |||
| 55 | |||
| 56 | /* |
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| 57 | * Function: uartPutc |
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| 58 | * |
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| 59 | * Input: BYTE c to send on uart |
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| 60 | * Output: none |
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| 61 | * Pre-conditions: call to uartInit() |
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| 62 | * Affects: none |
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| 63 | * Depends: none |
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| 64 | */ |
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| 65 | void uartPutc(BYTE c) |
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| 66 | { |
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| 67 | // Write the data byte to the USART |
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| 68 | TXREG = c; |
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| 69 | while(uartBusy()); |
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| 70 | } |
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| 71 | |||
| 72 | |||
| 73 | /* |
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| 74 | * Function: uartPuts |
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| 75 | * |
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| 76 | * Input: Byte array to send on uart |
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| 77 | * Output: none |
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| 78 | * Pre-conditions: call to uartInit() |
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| 79 | * Affects: none |
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| 80 | * Depends: none |
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| 81 | */ |
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| 82 | void uartPuts(BYTE c[]) |
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| 83 | { |
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| 84 | do |
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| 85 | { // Transmit a byte |
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| 86 | while(uartBusy()); |
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| 87 | uartPutc(*c); |
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| 88 | } while( *c++ ); |
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| 89 | } |
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| 90 | |||
| 91 | /* |
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| 92 | * Function: uartPutrs |
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| 93 | * |
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| 94 | * Input: Byte array to send on uart (static) |
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| 95 | * Output: none |
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| 96 | * Pre-conditions: call to uartInit() |
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| 97 | * Affects: none |
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| 98 | * Depends: none |
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| 99 | */ |
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| 100 | void uartPutrs(const rom char *c) |
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| 101 | { |
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| 102 | do |
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| 103 | { // Transmit a byte |
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| 104 | while(uartBusy()); |
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| 105 | uartPutc(*c); |
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| 106 | } while( *c++ ); |
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| 107 | } |
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| 108 | |||
| 109 | |||
| 110 | |||
| 111 | |||
| 112 | /* |
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| 113 | * Function: uartBusy |
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| 114 | * |
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| 115 | * Input: none. |
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| 116 | * Output: If usart busy or not. |
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| 117 | * Pre-conditions: call to uartInit() |
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| 118 | * Affects: none |
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| 119 | * Depends: none |
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| 120 | */ |
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| 121 | char uartBusy(void) |
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| 122 | { |
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| 123 | return !TXSTAbits.TRMT; |
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| 124 | } |
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| 125 | |||
| 126 | |||
| 127 | /* |
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| 128 | * Function: uartGet |
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| 129 | * |
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| 130 | * Input: none |
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| 131 | * Output: Byte read |
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| 132 | * Pre-conditions: call to uartInit() |
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| 133 | * Affects: none |
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| 134 | * Depends: none. |
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| 135 | */ |
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| 136 | BYTE uartGet(void) |
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| 137 | { |
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| 138 | // Return the received data |
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| 139 | return RCREG; |
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| 140 | } |
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| 141 | |||
| 142 | |||
| 143 | /* |
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| 144 | * Function: uartISR |
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| 145 | * |
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| 146 | * Input: none |
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| 147 | * Output: none |
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| 148 | * Pre-conditions: call to uartInit() |
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| 149 | * Affects: call to uartParse |
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| 150 | * Depends: none. |
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| 151 | */ |
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| 152 | void uartISR(void) |
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| 153 | { |
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| 154 | if (PIR1bits.RCIF==1 && PIE1bits.RCIE==1) |
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| 155 | { |
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| 156 | if (RCSTAbits.OERR) { RCSTAbits.CREN=0; RCSTAbits.CREN=1; } |
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| 157 | |||
| 158 | uartParse(uartGet()); |
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| 159 | PIR1bits.RCIF=0; |
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| 160 | } |
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| 161 | } |
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| 162 | |||
| 163 | |||
| 164 | /* |
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| 165 | * Function: uartDataRedy |
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| 166 | * |
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| 167 | * Input: none. |
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| 168 | * Output: If usart data are redy to be read. |
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| 169 | * Pre-conditions: call to uartInit() |
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| 170 | * Affects: none |
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| 171 | * Depends: none |
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| 172 | */ |
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| 173 | char uartDataRedy(void) |
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| 174 | { |
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| 175 | if(RCSTAbits.OERR) |
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| 176 | { |
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| 177 | RCSTAbits.CREN = 0; |
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| 178 | RCSTAbits.CREN = 1; |
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| 179 | } |
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| 180 | return PIR1bits.RCIF; |
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| 181 | } |
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| 182 | |||
| 183 | #endif |