sdcc/device/lib/pic16/libio/usart/uopen.c

   1 /*-------------------------------------------------------------------------
   2    uopen - initialize USART module
   3
   4    Copyright (C) 2004, Vangelis Rokas <vrokas AT otenet.gr>
   5
   6    This library is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the
   8    Free Software Foundation; either version 2, or (at your option) any
   9    later version.
  10
  11    This library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this library; see the file COPYING. If not, write to the
  18    Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
  19    MA 02110-1301, USA.
  20
  21    As a special exception, if you link this library with other files,
  22    some of which are compiled with SDCC, to produce an executable,
  23    this library does not by itself cause the resulting executable to
  24    be covered by the GNU General Public License. This exception does
  25    not however invalidate any other reasons why the executable file
  26    might be covered by the GNU General Public License.
  27 -------------------------------------------------------------------------*/
  28
  29 /*
  30  * Devices implemented:
  31  *      PIC18F[24][45][28]
  32  */
  33
  34
  35 #include <pic18fregs.h>
  36 #include <usart.h>
  37
  38 // USART Status Structure
  39 extern union USART USART_Status;
  40
  41 void
  42 usart_open (unsigned char config, sdcc_spbrg_t spbrg) __wparam
  43 {
  44   TXSTA = 0;           // Reset USART registers to POR state
  45   RCSTA = 0;
  46
  47   if (config & 0x01)
  48     TXSTAbits.SYNC = 1;
  49
  50   if (config & 0x02)
  51     {
  52       TXSTAbits.TX9 = 1;
  53       RCSTAbits.RX9 = 1;
  54     }
  55
  56   if (config & 0x04)
  57     TXSTAbits.CSRC = 1;
  58
  59   if (config & 0x08)
  60     RCSTAbits.CREN = 1;
  61   else
  62     RCSTAbits.SREN = 1;
  63
  64   if (config & 0x10)
  65     {
  66       TXSTAbits.BRGH = 1;
  67 #if !__SDCC_NO_SPBRGH
  68       BAUDCONbits.BRG16 = 1;
  69     }
  70   else
  71     {
  72       BAUDCONbits.BRG16 = 0;
  73 #endif  /* !__SDCC_NO_SPBRGH */
  74     }
  75
  76   /* TX interrupts */
  77
  78   PIR1bits.TXIF = 0;
  79
  80   if (config & 0x40)
  81     PIE1bits.RCIE = 1;
  82   else
  83     PIE1bits.RCIE = 0;
  84
  85   /* RX interrupts */
  86   PIR1bits.RCIF = 0;
  87
  88   if (config & 0x80)
  89     PIE1bits.TXIE = 1;
  90   else
  91     PIE1bits.TXIE = 0;
  92
  93 #if !__SDCC_NO_SPBRGH
  94   SPBRGH = (spbrg >> 8);
  95 #endif  /* !__SDCC_NO_SPBRGH */
  96   SPBRG = spbrg;
  97
  98 #if (__SDCC_USART_STYLE == 1812200)
  99   /* Configure RX/TX pins as digital pins. */
 100   ADCON1bits.PCFG5 = 1;
 101   ADCON1bits.PCFG6 = 1;
 102
 103   /* Configure RX/TX pins as inputs. */
 104   TRISBbits.TRISB1 = 1;
 105   TRISBbits.TRISB4 = 1;
 106 #elif (__SDCC_USART_STYLE == 1812300)
 107   /* Configure RX/TX pins as inputs. */
 108   TRISAbits.TRISA2 = 1;
 109   TRISAbits.TRISA3 = 1;
 110 #elif (__SDCC_USART_STYLE == 1813502)
 111   /* Configure RX pin as digital pin. */
 112   ANSELHbits.ANS11 = 0;
 113
 114   /* Configure RX/TX pins as inputs. */
 115   TRISBbits.TRISB5 = 1;
 116   TRISBbits.TRISB7 = 1;
 117 #elif (__SDCC_USART_STYLE == 1822200)
 118   /* Configure RX/TX pins. */
 119   TRISCbits.TRISC6 = 0;
 120   TRISCbits.TRISC7 = 1;
 121 #elif (__SDCC_USART_STYLE == 1822210) \
 122    || (__SDCC_USART_STYLE == 1865850)
 123   /* Configure RX/TX pins. */
 124   TRISCbits.TRISC6 = 1;
 125   TRISCbits.TRISC7 = 1;
 126 #elif (__SDCC_USART_STYLE == 1824500)
 127   /* Configure RX/TX pins. */
 128   TRISCbits.TRISC6 = 0;
 129   TRISCbits.TRISC7 = 1;
 130 #elif (__SDCC_USART_STYLE == 1824501) \
 131    || (__SDCC_USART_STYLE == 1865200)
 132   /* Configure RX1/TX1 pins. */
 133   TRISCbits.TRISC6 = 0;
 134   TRISCbits.TRISC7 = 1;
 135 #else /* other devices */
 136 #error Invalid USART style.
 137 #endif /* other devices */
 138
 139   TXSTAbits.TXEN = 1;
 140   RCSTAbits.SPEN = 1;
 141 }