1 files changed, 82 insertions, 0 deletions
diff --git a/device/lib/pic16/startup/crt0.c b/device/lib/pic16/startup/crt0.c
new file mode 100644
index 0000000..eb5f0c1
--- /dev/null
+++ b/device/lib/pic16/startup/crt0.c
@@ -0,0 +1,82 @@
+/*-------------------------------------------------------------------------
+   crt0.c - SDCC pic16 port runtime start code
+
+   Copyright (C) 2004, Vangelis Rokas <vrokas at otenet.gr>
+
+   This library is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by the
+   Free Software Foundation; either version 2, 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 library; see the file COPYING. If not, write to the
+   Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
+   MA 02110-1301, USA.
+
+   As a special exception, if you link this library with other files,
+   some of which are compiled with SDCC, to produce an executable,
+   this library does not by itself cause the resulting executable to
+   be covered by the GNU General Public License. This exception does
+   not however invalidate any other reasons why the executable file
+   might be covered by the GNU General Public License.
+-------------------------------------------------------------------------*/
+
+/*
+ * based on Microchip MPLAB-C18 startup files
+ */
+
+extern int stack_end;
+extern int TBLPTRU;
+
+/* external reference to the user's main routine */
+extern void main (void);
+
+void _entry (void) __naked __interrupt 0;
+void _startup (void) __naked;
+
+/* Access bank selector. */
+#define a 0
+
+
+/*
+ * entry function, placed at interrupt vector 0 (RESET)
+ */
+void
+_entry (void) __naked __interrupt 0
+{
+  __asm
+    goto    __startup
+  __endasm;
+}
+
+void
+_startup (void) __naked
+{
+  __asm
+    ; Initialize the stack pointer
+    lfsr    1, _stack_end
+    lfsr    2, _stack_end
+
+    ; 1st silicon does not do this on POR
+    clrf    _TBLPTRU, a
+
+    ; Initialize the flash memory access configuration.
+    ; This is harmless for non-flash devices, so we do it on all parts.
+    bsf     0xa6, 7, a      ; EECON1.EEPGD = 1, TBLPTR accesses program memory
+    bcf     0xa6, 6, a      ; EECON1.CFGS  = 0, TBLPTR accesses program memory
+  __endasm;
+
+  /* Call the main routine. */
+  main ();
+
+  __asm
+lockup:
+    ; Returning from main will lock up.
+    bra     lockup
+  __endasm;
+}