ser_i196.c

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00001 
00040 /*#*
00041  *#* $Log$
00042  *#* Revision 1.7  2006/07/19 12:56:26  bernie
00043  *#* Convert to new Doxygen style.
00044  *#*
00045  *#* Revision 1.6  2005/11/04 16:20:02  bernie
00046  *#* Fix reference to README.devlib in header.
00047  *#*
00048  *#* Revision 1.5  2004/12/13 11:51:08  bernie
00049  *#* DISABLE_INTS/ENABLE_INTS: Convert to IRQ_DISABLE/IRQ_ENABLE.
00050  *#*
00051  *#* Revision 1.4  2004/08/25 14:12:08  rasky
00052  *#* Aggiornato il comment block dei log RCS
00053  *#*
00054  *#* Revision 1.3  2004/06/03 11:27:09  bernie
00055  *#* Add dual-license information.
00056  *#*
00057  *#* Revision 1.2  2004/05/23 18:21:53  bernie
00058  *#* Trim CVS logs and cleanup header info.
00059  *#*
00060  *#*/
00061 
00062 #include "hw.h"
00063 #include "serhw.h"
00064 
00065 #define SER_HW_ENABLE_TX \
00066     ATOMIC( \
00067         if (!ser_sending) \
00068         { \
00069             ser_sending = true; \
00070             (INT_PEND1 |= INT1F_TI) \
00071         } \
00072     );
00073 
00074 static volatile bool ser_sending;
00075 
00076 // Serial TX intr
00077 INTERRUPT(0x30) void TI_interrupt(void)
00078 {
00079     if (CANT_SEND)
00080     {
00081         ser_sending = false;
00082         return;
00083     }
00084 
00085     /* Can we send two bytes at the same time? */
00086     if (SP_STAT & SPSF_TX_EMPTY)
00087     {
00088         SBUF = fifo_pop(&ser_txfifo);
00089 
00090         if (CANT_SEND)
00091         {
00092             ser_sending = false;
00093             return;
00094         }
00095     }
00096 
00097     SBUF = fifo_pop(&ser_txfifo);
00098 }
00099 
00100 INTERRUPT(0x32) void RI_interrupt(void)
00101 {
00102     ser_status |= SP_STAT &
00103         (SPSF_OVERRUN_ERROR | SPSF_PARITY_ERROR | SPSF_FRAMING_ERROR);
00104     if (fifo_isfull(&ser_rxfifo))
00105         ser_status |= SERRF_RXFIFOOVERRUN;
00106     else
00107         fifo_push(&ser_rxfifo, SBUF);
00108 }
00109 
00110 static void ser_setbaudrate(unsigned long rate)
00111 {
00112     // Calcola il periodo per la generazione del baud rate richiesto
00113     uint16_t baud = (uint16_t)(((CPU_FREQ / 16) / rate) - 1) | 0x8000;
00114     BAUD_RATE = (uint8_t)baud;
00115     BAUD_RATE = (uint8_t)(baud >> 8);
00116 }
00117 
00118 static void ser_hw_init(void)
00119 {
00120     // Inizializza la porta seriale
00121     SP_CON = SPCF_RECEIVE_ENABLE | SPCF_MODE1;
00122     ioc1_img |= IOC1F_TXD_SEL | IOC1F_EXTINT_SRC;
00123     IOC1 = ioc1_img;
00124 
00125     // Svuota il buffer di ricezione
00126     {
00127         uint8_t dummy = SBUF;
00128     }
00129 
00130     // Abilita gli interrupt
00131     INT_MASK1 |= INT1F_TI | INT1F_RI;
00132 }
00133