Added another example showing simple interrupt interception.

1 files changed, 81 insertions, 0 deletions

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 ("+");
+}