sdcc/device/lib/pic16/libio/adc/adcbusy.c

   1 /*-------------------------------------------------------------------------
   2    adcbusy - check whether the AD module is busy
   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 #include <pic18fregs.h>
  30 #include <adc.h>
  31
  32
  33 char adc_busy(void) __naked
  34 {
  35 #if (__SDCC_ADC_STYLE == 1865501)
  36   WDTCONbits.ADSHR = 0; /* access ADCON0/1 */
  37 #endif
  38 #if 0
  39   return (ADCON0bits.GO);
  40 #else
  41 #if (__SDCC_ADC_STYLE == 1802420)
  42   __asm
  43     movlw       0x00
  44     btfsc       _ADCON0bits, 2
  45     addlw       0x01
  46     return
  47   __endasm;
  48 #elif (__SDCC_ADC_STYLE == 1812200) \
  49    || (__SDCC_ADC_STYLE == 1812300) \
  50    || (__SDCC_ADC_STYLE == 1813502) \
  51    || (__SDCC_ADC_STYLE == 1822200) \
  52    || (__SDCC_ADC_STYLE == 1823222) \
  53    || (__SDCC_ADC_STYLE == 1824501) \
  54    || (__SDCC_ADC_STYLE == 1865501)
  55   __asm
  56     movlw       0x00
  57     btfsc       _ADCON0bits, 1
  58     addlw       0x01
  59     return
  60   __endasm;
  61 #else /* unsupported ADC style */
  62 #error Unsupported ADC style.
  63 #endif
  64 #endif
  65 }