X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=bertos%2Fcpu%2Fcortex-m3%2Fhw%2Finit_lm3s.c;fp=bertos%2Fcpu%2Fcortex-m3%2Fhw%2Finit_lm3s.c;h=eaa05edfd6fe3db4235e1b9e437012a4842be28b;hb=a61181f8614fe8257dc21bf1762a380165932348;hp=0000000000000000000000000000000000000000;hpb=39fa28bf9a32a1ad99c631c20b38ecacd5c0626f;p=bertos.git

diff --git a/bertos/cpu/cortex-m3/hw/init_lm3s.c b/bertos/cpu/cortex-m3/hw/init_lm3s.c
new file mode 100644
index 00000000..eaa05edf
--- /dev/null
+++ b/bertos/cpu/cortex-m3/hw/init_lm3s.c
@@ -0,0 +1,78 @@
+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2010 Develer S.r.l. (http://www.develer.com/)
+ *
+ * -->
+ *
+ * \brief Cortex-M3 architecture's entry point
+ *
+ * \author Andrea Righi <arighi@develer.com>
+ */
+
+#include <cfg/compiler.h>
+#include <cfg/debug.h>
+#include <cpu/attr.h> /* PAUSE */
+#include "drv/irq_lm3s.h"
+#include "drv/clock_lm3s.h"
+#include "io/lm3s.h"
+
+extern size_t __text_end, __data_start, __data_end, __bss_start, __bss_end;
+
+extern void __init2(void);
+
+/* Architecture's entry point */
+void __init2(void)
+{
+	/*
+	 * PLL may not function properly at default LDO setting.
+	 *
+	 * Description:
+	 *
+	 * In designs that enable and use the PLL module, unstable device
+	 * behavior may occur with the LDO set at its default of 2.5 volts or
+	 * below (minimum of 2.25 volts). Designs that do not use the PLL
+	 * module are not affected.
+	 *
+	 * Workaround: Prior to enabling the PLL module, it is recommended that
+	 * the default LDO voltage setting of 2.5 V be adjusted to 2.75 V using
+	 * the LDO Power Control (LDOPCTL) register.
+	 *
+	 * Silicon Revision Affected: A1, A2
+	 *
+	 * See also: Stellaris LM3S1968 A2 Errata documentation.
+	 */
+	if (REVISION_IS_A1 | REVISION_IS_A2)
+		HWREG(SYSCTL_LDOPCTL) = SYSCTL_LDOPCTL_2_75V;
+
+	/* Set the appropriate clocking configuration */
+	clock_set_rate();
+
+	/* Initialize IRQ vector table in RAM */
+	sysirq_init();
+}