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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 25 | 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 | |||
| 24 | johboh | 13 | #include "../Include/stackTasks.h" |
| 14 | #include "../Include/uart.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 | |||
| 32 | johboh | 20 | |
| 24 | johboh | 21 | /* |
| 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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| 35 | TXSTA=0b00100000; // Low BRG speed |
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| 36 | RCSTA=0b10010000; |
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| 37 | SPBRG = SPBRG_VAL; |
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| 38 | // USART RX interrupt |
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| 39 | PIR1bits.RCIF=0; |
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| 40 | PIE1bits.RCIE=1; |
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| 41 | // High interrupt |
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| 42 | IPR1bits.RCIP=1; |
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| 43 | } |
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| 44 | |||
| 45 | |||
| 46 | /* |
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| 47 | * Function: uartPutc |
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| 48 | * |
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| 49 | * Input: BYTE c to send on uart |
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| 50 | * Output: none |
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| 51 | * Pre-conditions: call to uartInit() |
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| 52 | * Affects: none |
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| 53 | * Depends: none |
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| 54 | */ |
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| 55 | void uartPutc(BYTE c) |
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| 56 | { |
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| 57 | // Write the data byte to the USART |
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| 58 | TXREG = c; |
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| 59 | while(uartBusy()); |
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| 60 | } |
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| 61 | |||
| 62 | |||
| 63 | /* |
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| 64 | * Function: uartPuts |
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| 65 | * |
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| 66 | * Input: Byte array to send on uart |
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| 67 | * Output: none |
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| 68 | * Pre-conditions: call to uartInit() |
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| 69 | * Affects: none |
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| 70 | * Depends: none |
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| 71 | */ |
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| 72 | void uartPuts(BYTE c[]) |
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| 73 | { |
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| 74 | do |
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| 75 | { // Transmit a byte |
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| 76 | while(uartBusy()); |
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| 77 | uartPutc(*c); |
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| 78 | } while( *c++ ); |
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| 79 | } |
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| 80 | |||
| 81 | /* |
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| 82 | * Function: uartPutrs |
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| 83 | * |
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| 84 | * Input: Byte array to send on uart (static) |
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| 85 | * Output: none |
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| 86 | * Pre-conditions: call to uartInit() |
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| 87 | * Affects: none |
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| 88 | * Depends: none |
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| 89 | */ |
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| 90 | void uartPutrs(const rom char *c) |
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| 91 | { |
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| 92 | do |
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| 93 | { // Transmit a byte |
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| 94 | while(uartBusy()); |
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| 95 | uartPutc(*c); |
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| 96 | } while( *c++ ); |
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| 97 | } |
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| 98 | |||
| 99 | |||
| 100 | |||
| 101 | |||
| 102 | /* |
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| 103 | * Function: uartBusy |
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| 104 | * |
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| 105 | * Input: none. |
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| 106 | * Output: If usart busy or not. |
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| 107 | * Pre-conditions: call to uartInit() |
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| 108 | * Affects: none |
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| 109 | * Depends: none |
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| 110 | */ |
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| 111 | char uartBusy(void) |
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| 112 | { |
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| 113 | return !TXSTAbits.TRMT; |
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| 114 | } |
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| 115 | |||
| 116 | |||
| 117 | /* |
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| 118 | * Function: uartGet |
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| 119 | * |
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| 120 | * Input: none |
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| 121 | * Output: Byte read |
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| 122 | * Pre-conditions: call to uartInit() |
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| 123 | * Affects: none |
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| 124 | * Depends: none. |
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| 125 | */ |
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| 126 | BYTE uartGet(void) |
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| 127 | { |
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| 128 | // Return the received data |
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| 129 | return RCREG; |
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| 130 | } |
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| 131 | |||
| 132 | |||
| 133 | /* |
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| 32 | johboh | 134 | * Function: uartGets |
| 135 | * |
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| 136 | * Input: Byte array to read, number of bytes to read and timeout. |
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| 137 | * Output: Number of read bytes. |
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| 138 | * Pre-conditions: call to uartInit() |
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| 139 | * Affects: none |
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| 140 | * Depends: none |
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| 141 | */ |
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| 142 | BYTE uartGets(BYTE *buffer, BYTE length,unsigned int uart_data_wait) |
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| 143 | { |
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| 144 | unsigned int wait = 0; |
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| 145 | BYTE data; |
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| 146 | |||
| 147 | while(length) |
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| 148 | { |
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| 149 | while(!uartDataRedy()) |
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| 150 | { |
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| 151 | if(wait < uart_data_wait) |
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| 152 | wait++ ; /*wait for more data */ |
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| 153 | else |
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| 154 | return(length); /*Time out- Return words/bytes to be read */ |
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| 155 | } |
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| 156 | wait=0; |
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| 157 | data = uartGet(); |
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| 158 | *buffer = data; |
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| 159 | buffer++; // Increment the string pointer |
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| 160 | length--; |
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| 161 | } |
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| 162 | |||
| 163 | return(length); /* number of data yet to be received i.e.,0 */ |
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| 164 | |||
| 165 | |||
| 166 | |||
| 167 | |||
| 168 | |||
| 169 | |||
| 170 | } |
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| 171 | |||
| 172 | /* |
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| 24 | johboh | 173 | * Function: uartISR |
| 174 | * |
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| 175 | * Input: none |
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| 176 | * Output: none |
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| 177 | * Pre-conditions: call to uartInit() |
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| 178 | * Affects: call to uartParse |
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| 179 | * Depends: none. |
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| 180 | */ |
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| 181 | void uartISR(void) |
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| 182 | { |
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| 183 | if (PIR1bits.RCIF==1 && PIE1bits.RCIE==1) |
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| 184 | { |
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| 185 | uartParse(uartGet()); |
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| 186 | PIR1bits.RCIF=0; |
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| 187 | } |
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| 188 | } |
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| 189 | |||
| 190 | |||
| 32 | johboh | 191 | /* |
| 192 | * Function: uartDataRedy |
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| 193 | * |
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| 194 | * Input: none. |
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| 195 | * Output: If usart data are redy to be read. |
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| 196 | * Pre-conditions: call to uartInit() |
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| 197 | * Affects: none |
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| 198 | * Depends: none |
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| 199 | */ |
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| 200 | char uartDataRedy(void) |
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| 201 | { |
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| 202 | if(RCSTAbits.OERR) |
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| 203 | { |
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| 204 | RCSTAbits.CREN = 0; |
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| 205 | RCSTAbits.CREN = 1; |
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| 206 | } |
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| 207 | return PIR1bits.RCIF; |
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| 208 | } |
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| 209 | |||
| 24 | johboh | 210 | #endif |