1 files changed, 78 insertions, 0 deletions

diff --git a/firmware/target/arm/at91sam/lyre_proto1/kernel-lyre_proto1.c b/firmware/target/arm/at91sam/lyre_proto1/kernel-lyre_proto1.c
new file mode 100644
index 0000000000..4d7167b3ba
--- /dev/null
+++ b/firmware/target/arm/at91sam/lyre_proto1/kernel-lyre_proto1.c
@@ -0,0 +1,78 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ *
+ * Copyright (C) 2009 by Jorge Pinto
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "config.h"
+#include "system.h"
+#include "kernel.h"
+#include "timer.h"
+#include "thread.h"
+#include "at91sam9260.h"
+
+/*-----------------------------------------------------------------------------
+ * Function Name       : pitc_handler
+ * Object              : Handler for PITC interrupt
+ *---------------------------------------------------------------------------*/
+void pitc_handler(void)
+{
+    unsigned long pivr = 0;
+    unsigned long pisr = 0;
+
+    /* Read the PISR */
+    pisr = AT91C_PITC_PISR & AT91C_PITC_PITS;
+
+    /* Read the PIVR. It acknowledges the IT */
+    pivr = AT91C_PITC_PIVR;
+
+    /* Run through the list of tick tasks */
+    call_tick_tasks();
+}
+
+void tick_start(unsigned int interval_in_ms)
+{
+    volatile unsigned long pimr = 0;
+
+    /* Configure a resolution of 1 ms */
+    AT91C_PITC_PIMR = MCK_FREQ / (((16 * 1000) - 1) / interval_in_ms);
+
+    /* Enable interrupts */
+    /* Disable the interrupt on the interrupt controller */
+    AT91C_AIC_IDCR = (1 << AT91C_ID_SYS);
+
+    /* Save the interrupt handler routine pointer and the interrupt priority */
+    AT91C_AIC_SVR(AT91C_ID_SYS) = (unsigned long) pitc_handler;
+
+    /* Store the Source Mode Register */
+    AT91C_AIC_SMR(AT91C_ID_SYS) = AT91C_AIC_SRCTYPE_INT_LEVEL_SENSITIVE | \
+    AT91C_AIC_PRIOR_LOWEST;
+    /* Clear the interrupt on the interrupt controller */
+    AT91C_AIC_ICCR = (1 << AT91C_ID_SYS);
+
+    /* Enable the interrupt on the interrupt controller */
+    AT91C_AIC_IECR = (1 << AT91C_ID_SYS);
+
+    /* Enable the interrupt on the pit */
+    pimr = AT91C_PITC_PIMR;
+    AT91C_PITC_PIMR = pimr | AT91C_PITC_PITIEN;
+
+    /* Enable the pit */
+    pimr = AT91C_PITC_PIMR;
+    AT91C_PITC_PIMR = pimr | AT91C_PITC_PITEN;
+}