* src/pic16/device.c (Pics16[]): added devices 18F2550, 18F4331,

[fw/sdcc] / device / lib / pic16 / libio / adc / adcsetch.c

diff --git a/device/lib/pic16/libio/adc/adcsetch.c b/device/lib/pic16/libio/adc/adcsetch.c
index f55e77b1e20066d0831eca4eea38b4317a4e36b3..5802e67cf061aceb45fec9eafb7be43c43d5fddd 100644 (file)
--- a/device/lib/pic16/libio/adc/adcsetch.c
+++ b/device/lib/pic16/libio/adc/adcsetch.c
@@ -1,11 +1,58 @@
 
+/*
+ * adcsetch - select convertion channel
+ *
+ * written by Vangelis Rokas, 2004 <vrokas AT otenet.gr>
+ *
+ * Devices implemented:
+ *     PIC18F[24][45][28]
+ *
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+/*
+** $Id$
+*/
+
 #include <pic18fregs.h>
 
 #include <adc.h>
 
 
-void adc_setchannel(unsigned char channel)
+void adc_setchannel(unsigned char channel) _naked
 {
-       ADCON0 &= ~(0x7 << 3);
-       ADCON0 |= channel << 3;
+#if 0
+  ADCON0 &= ~(0x7 << 3);
+  ADCON0 |= channel << 3;
+#else
+  channel;
+  _asm
+    movlw       0xc7
+    andwf       _ADCON0, f
+    
+    movlw       0x01
+    movf        _PLUSW1, w
+    
+    rlcf        _WREG, w
+    rlcf        _WREG, w
+    rlcf        _WREG, w
+
+    iorwf       _ADCON0, f
+
+    return
+  _endasm;
+#endif    
 }