1 files changed, 167 insertions, 0 deletions
diff --git a/firmware/fx2/common/isr.c b/firmware/fx2/common/isr.c
new file mode 100644
index 000000000..05412daf5
--- /dev/null
+++ b/firmware/fx2/common/isr.c
@@ -0,0 +1,167 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2003 Free Software Foundation, Inc.
+ * 
+ * This file is part of GNU Radio
+ * 
+ * GNU Radio 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 3, or (at your option)
+ * any later version.
+ * 
+ * GNU Radio 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 GNU Radio; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "isr.h"
+#include "fx2regs.h"
+#include "syncdelay.h"
+
+extern xdata unsigned char _standard_interrupt_vector[];
+extern xdata unsigned char _usb_autovector[];
+extern xdata unsigned char _fifo_gpif_autovector[];
+
+#define LJMP_OPCODE	0x02
+
+/*
+ * Hook standard interrupt vector.
+ *
+ * vector_number is from the SV_<foo> list.
+ * addr is the address of the interrupt service routine.
+ */
+void 
+hook_sv (unsigned char vector_number, unsigned short addr)
+{
+  bit	t;
+  
+  // sanity checks
+
+  if (vector_number < SV_MIN || vector_number > SV_MAX)
+    return;
+
+  if ((vector_number & 0x0f) != 0x03 && (vector_number & 0x0f) != 0x0b)
+    return;
+
+  t = EA;
+  EA = 0;
+  _standard_interrupt_vector[vector_number] = LJMP_OPCODE;
+  _standard_interrupt_vector[vector_number + 1] = addr >> 8;
+  _standard_interrupt_vector[vector_number + 2] = addr & 0xff;
+  EA = t;
+}
+
+/*
+ * Hook usb interrupt vector.
+ *
+ * vector_number is from the UV_<foo> list.
+ * addr is the address of the interrupt service routine.
+ */
+void 
+hook_uv (unsigned char vector_number, unsigned short addr)
+{
+  bit	t;
+  
+  // sanity checks
+
+  if (vector_number < UV_MIN || vector_number > UV_MAX)
+    return;
+
+  if ((vector_number & 0x3) != 0)
+    return;
+
+  t = EA;
+  EA = 0;
+  _usb_autovector[vector_number] = LJMP_OPCODE;
+  _usb_autovector[vector_number + 1] = addr >> 8;
+  _usb_autovector[vector_number + 2] = addr & 0xff;
+  EA = t;
+}
+
+/*
+ * Hook fifo/gpif interrupt vector.
+ *
+ * vector_number is from the FGV_<foo> list.
+ * addr is the address of the interrupt service routine.
+ */
+void 
+hook_fgv (unsigned char vector_number, unsigned short addr)
+{
+  bit	t;
+  
+  // sanity checks
+
+  if (vector_number < FGV_MIN || vector_number > FGV_MAX)
+    return;
+
+  if ((vector_number & 0x3) != 0)
+    return;
+
+  t = EA;
+  EA = 0;
+  _fifo_gpif_autovector[vector_number] = LJMP_OPCODE;
+  _fifo_gpif_autovector[vector_number + 1] = addr >> 8;
+  _fifo_gpif_autovector[vector_number + 2] = addr & 0xff;
+  EA = t;
+}
+
+/*
+ * One time call to enable autovectoring for both USB and FIFO/GPIF.
+ *
+ * This disables all USB and FIFO/GPIF interrupts and clears
+ * any pending interrupts too.  It leaves the master USB and FIFO/GPIF
+ * interrupts enabled.
+ */
+void
+setup_autovectors (void)
+{
+  // disable master usb and fifo/gpif interrupt enables
+  EIUSB = 0;
+  EIEX4 = 0;
+
+  hook_sv (SV_INT_2, (unsigned short) _usb_autovector);
+  hook_sv (SV_INT_4, (unsigned short) _fifo_gpif_autovector);
+
+  // disable all fifo interrupt enables
+  SYNCDELAY;
+  EP2FIFOIE = 0;	SYNCDELAY;
+  EP4FIFOIE = 0;	SYNCDELAY;
+  EP6FIFOIE = 0;	SYNCDELAY;
+  EP8FIFOIE = 0;	SYNCDELAY;
+
+  // clear all pending fifo irqs	
+  EP2FIFOIRQ = 0xff;	SYNCDELAY;
+  EP4FIFOIRQ = 0xff;	SYNCDELAY;
+  EP6FIFOIRQ = 0xff;	SYNCDELAY;
+  EP8FIFOIRQ = 0xff;	SYNCDELAY;
+
+  IBNIE  = 0;
+  IBNIRQ = 0xff;
+  NAKIE  = 0;
+  NAKIRQ = 0xff;
+  USBIE  = 0;
+  USBIRQ = 0xff;
+  EPIE   = 0;
+  EPIRQ  = 0xff;
+  SYNCDELAY;	GPIFIE = 0;		
+  SYNCDELAY;	GPIFIRQ = 0xff;
+  USBERRIE = 0;
+  USBERRIRQ = 0xff;
+  CLRERRCNT = 0;
+  
+  INTSETUP = bmAV2EN | bmAV4EN | bmINT4IN;
+
+  // clear master irq's for usb and fifo/gpif
+  EXIF &= ~bmEXIF_USBINT;
+  EXIF &= ~bmEXIF_IE4;
+  
+  // enable master usb and fifo/gpif interrrupts
+  EIUSB = 1;
+  EIEX4 = 1;
+}