Diff: Memory/sdram.h

Revision:

0:6b68dac0d986

Child:

9:a33326afd686

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Memory/sdram.h	Fri Nov 21 11:42:51 2014 +0000
@@ -0,0 +1,67 @@
+/*
+ *  Copyright 2013 Embedded Artists AB
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+#ifndef __SDRAM_H
+#define __SDRAM_H
+
+#include "stdint.h"
+
+/*
+ * These timing parameters are based on the EMC clock
+ * there is no way of ensuring what the EMC clock frequency is
+ * without severely bloating the code
+ * ENSURE THAT THE EMC clock is one of these values
+ */
+#define SDRAM_SPEED_48 0
+#define SDRAM_SPEED_50 1
+#define SDRAM_SPEED_60 2
+#define SDRAM_SPEED_72 3
+#define SDRAM_SPEED_80 4
+
+#define SDRAM_SPEED SDRAM_SPEED_60
+
+#define SDRAM_CONFIG_32BIT
+#define SDRAM_SIZE               0x2000000
+
+#define SDRAM_BASE               0xA0000000 /*CS0*/
+
+/* Initializes the SDRAM.
+ *
+ * The entire SDRAM will be made available to malloc per default.
+ *
+ * Note that this functions is called internally if malloc requests
+ * memory from SDRAM and that hasn't been disabled with a call to
+ * sdram_disableMallocSdram().
+ *
+ * @returns 0 on success, 1 on failure
+ */
+uint32_t sdram_init();
+
+/* Prevents malloc from using SDRAM.
+ *
+ * This function must be called before the first allocation that 
+ * would have been in SDRAM. If a big allocation has already been
+ * made then this call will do nothing as the SDRAM will have been
+ * initialized and all SDRAM given to malloc.
+ */
+void sdram_disableMallocSdram();
+
+#endif /* end __SDRAM_H */
+/****************************************************************************
+**                            End Of File
+*****************************************************************************/
+
+