diff options
Diffstat (limited to 'examples')
| -rw-r--r-- | examples/Makefile | 6 | ||||
| -rw-r--r-- | examples/interrupt.c | 81 |
2 files changed, 87 insertions, 0 deletions
diff --git a/examples/Makefile b/examples/Makefile index 85118ea..d7cd843 100644 --- a/examples/Makefile +++ b/examples/Makefile @@ -94,6 +94,12 @@ SREC += mem_to_mem_idma2intr.srec BIN += mem_to_mem_idma2intr.bin mem_to_mem_idma2intr endif +# Demo for 52xx IRQs +ifeq ($(CPU),mpc5xxx) +SREC += interrupt.srec +BIN += interrupt.bin interrupt +endif + # Utility for resetting i82559 EEPROM ifeq ($(BOARD),oxc) SREC += eepro100_eeprom.srec diff --git a/examples/interrupt.c b/examples/interrupt.c new file mode 100644 index 0000000..f3061d1 --- /dev/null +++ b/examples/interrupt.c @@ -0,0 +1,81 @@ +/* + * (C) Copyright 2006 + * Detlev Zundel, DENX Software Engineering, dzu@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program 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 of + * the License, or (at your option) any later version. + * + * This program 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 + * + * This is a very simple standalone application demonstrating + * catching IRQs on the MPC52xx architecture. + * + * The interrupt to be intercepted can be specified as an argument + * to the application. Specifying nothing will intercept IRQ1 on the + * MPC5200 platform. On the CR825 carrier board from MicroSys this + * maps to the ABORT switch :) + * + * Note that the specified vector is only a logical number specified + * by the respective header file. + */ + +#include <common.h> +#include <exports.h> +#include <config.h> + +#if defined(CONFIG_MPC5xxx) +#define DFL_IRQ MPC5XXX_IRQ1 +#else +#define DFL_IRQ 0 +#endif + +static void irq_handler (void *arg); + +int interrupt (int argc, char *argv[]) +{ + int c, irq = -1; + + app_startup (argv); + + if (argc > 1) + irq = simple_strtoul (argv[1], NULL, 0); + if ((irq < 0) || (irq > NR_IRQS)) + irq = DFL_IRQ; + + printf ("Installing handler for irq vector %d and doing busy wait\n", + irq); + printf ("Press 'q' to quit\n"); + + /* Install interrupt handler */ + install_hdlr (irq, irq_handler, NULL); + while ((c = getc ()) != 'q') { + printf ("Ok, ok, I am still alive!\n"); + } + + free_hdlr (irq); + printf ("\nInterrupt handler has been uninstalled\n"); + + return (0); +} + +/* + * Handler for interrupt + */ +static void irq_handler (void *arg) +{ + /* just for demonstration */ + printf ("+"); +} |