sdcc-3.9.0 fork implementing GNU assembler syntax

This fork aims to provide better support for stm8-binutils

1 files changed, 154 insertions, 0 deletions

diff --git a/device/lib/ser_ir.c b/device/lib/ser_ir.c
new file mode 100644
index 0000000..75c09ab
--- /dev/null
+++ b/device/lib/ser_ir.c
@@ -0,0 +1,154 @@
+/*-------------------------------------------------------------------------
+   ser_ir.h - source file for serial routines
+
+   Copyright (C) 1999, Josef Wolf <jw AT raven.inka.de>
+
+   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.
+-------------------------------------------------------------------------*/
+
+#include "ser_ir.h"
+
+/* This file implements a serial interrupt handler and its supporting
+* routines. Compared with the existing serial.c and _ser.c it has
+* following advantages:
+* - You can specify arbitrary buffer sizes (umm, up to 255 bytes),
+*   so it can run on devices with _little_ memory like at89cx051.
+* - It won't overwrite characters which already are stored in the
+*   receive-/transmit-buffer.
+*/
+
+/* BUG: those definitions (and the #include) should be set dynamically
+* (while linking or at runtime) to make this file a _real_ library.
+*/
+#include <8051.h>
+#define XBUFLEN 4
+#define RBUFLEN 8
+
+/* You might want to specify idata, pdata or xdata for the buffers */
+static unsigned char __pdata rbuf[RBUFLEN], xbuf[XBUFLEN];
+static unsigned char rcnt, xcnt, rpos, xpos;
+static __bit busy;
+
+void
+ser_init (void)
+{
+   ES = 0;
+   rcnt = xcnt = rpos = xpos = 0;  /* init buffers */
+   busy = 0;
+   SCON = 0x50;
+   PCON |= 0x80;                   /* SMOD = 1; */
+   TMOD &= 0x0f;                   /* use timer 1 */
+   TMOD |= 0x20;
+   TL1 = -3; TH1 = -3; TR1 = 1;    /* 19200bps with 11.059MHz crystal */
+   ES = 1;
+}
+
+void
+ser_handler (void) __interrupt 4
+{
+   if (RI) {
+	   RI = 0;
+	   /* don't overwrite chars already in buffer */
+	   if (rcnt < RBUFLEN)
+		   rbuf [(unsigned char)(rpos+rcnt++) % RBUFLEN] = SBUF;
+   }
+   if (TI) {
+	   TI = 0;
+	   if (busy = xcnt) {   /* Assignment, _not_ comparison! */
+		   xcnt--;
+		   SBUF = xbuf [xpos++];
+		   if (xpos >= XBUFLEN)
+			   xpos = 0;
+	   }
+   }
+}
+
+void
+ser_putc (unsigned char c)
+{
+   while (xcnt >= XBUFLEN) /* wait for room in buffer */
+	   ;
+   ES = 0;
+   if (busy) {
+	   xbuf[(unsigned char)(xpos+xcnt++) % XBUFLEN] = c;
+   } else {
+	   SBUF = c;
+	   busy = 1;
+   }
+   ES = 1;
+}
+
+unsigned char
+ser_getc (void)
+{
+   unsigned char c;
+   while (!rcnt)   /* wait for character */
+	   ;
+   ES = 0;
+   rcnt--;
+   c = rbuf [rpos++];
+   if (rpos >= RBUFLEN)
+	   rpos = 0;
+   ES = 1;
+   return (c);
+}
+
+#pragma save
+#pragma noinduction
+void
+ser_puts (unsigned char *s)
+{
+   unsigned char c;
+   while (c=*s++) {
+	   if (c == '\n') ser_putc ('\r');
+	   ser_putc (c);
+   }
+}
+#pragma restore
+
+void
+ser_gets (unsigned char *s, unsigned char len)
+{
+   unsigned char pos, c;
+
+   pos = 0;
+   while (pos <= len) {
+	   c = ser_getc ();
+	   if (c == '\r') continue;        /* discard CR's */
+	   s[pos++] = c;
+	   if (c == '\n') break;           /* NL terminates */
+   }
+   s[pos] = '\0';
+}
+
+unsigned char
+ser_can_xmt (void)
+{
+   return XBUFLEN - xcnt;
+}
+
+unsigned char
+ser_can_rcv (void)
+{
+   return rcnt;
+}