diff options
Diffstat (limited to 'firmware/fx2/lib/isr.c')
| -rw-r--r-- | firmware/fx2/lib/isr.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/firmware/fx2/lib/isr.c b/firmware/fx2/lib/isr.c new file mode 100644 index 000000000..05412daf5 --- /dev/null +++ b/firmware/fx2/lib/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; +} |