Wei Chang Shen / DMSupport

Dependencies:   DM_FATFileSystem EthernetInterface HTTPClient mbed-rtos mbed-src

Fork of DMSupport by Embedded Artists

Memory/sdram.h@0:6b68dac0d986, 2014-11-21 (annotated)

Committer:
embeddedartists
Date:
Fri Nov 21 11:42:51 2014 +0000
Revision:
0:6b68dac0d986
Child:
9:a33326afd686
First version

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 0:6b68dac0d986 1 /*
embeddedartists 0:6b68dac0d986 2 * Copyright 2013 Embedded Artists AB
embeddedartists 0:6b68dac0d986 3 *
embeddedartists 0:6b68dac0d986 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 0:6b68dac0d986 5 * you may not use this file except in compliance with the License.
embeddedartists 0:6b68dac0d986 6 * You may obtain a copy of the License at
embeddedartists 0:6b68dac0d986 7 *
embeddedartists 0:6b68dac0d986 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 0:6b68dac0d986 9 *
embeddedartists 0:6b68dac0d986 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 0:6b68dac0d986 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 0:6b68dac0d986 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 0:6b68dac0d986 13 * See the License for the specific language governing permissions and
embeddedartists 0:6b68dac0d986 14 * limitations under the License.
embeddedartists 0:6b68dac0d986 15 */
embeddedartists 0:6b68dac0d986 16
embeddedartists 0:6b68dac0d986 17 #ifndef __SDRAM_H
embeddedartists 0:6b68dac0d986 18 #define __SDRAM_H
embeddedartists 0:6b68dac0d986 19
embeddedartists 0:6b68dac0d986 20 #include "stdint.h"
embeddedartists 0:6b68dac0d986 21
embeddedartists 0:6b68dac0d986 22 /*
embeddedartists 0:6b68dac0d986 23 * These timing parameters are based on the EMC clock
embeddedartists 0:6b68dac0d986 24 * there is no way of ensuring what the EMC clock frequency is
embeddedartists 0:6b68dac0d986 25 * without severely bloating the code
embeddedartists 0:6b68dac0d986 26 * ENSURE THAT THE EMC clock is one of these values
embeddedartists 0:6b68dac0d986 27 */
embeddedartists 0:6b68dac0d986 28 #define SDRAM_SPEED_48 0
embeddedartists 0:6b68dac0d986 29 #define SDRAM_SPEED_50 1
embeddedartists 0:6b68dac0d986 30 #define SDRAM_SPEED_60 2
embeddedartists 0:6b68dac0d986 31 #define SDRAM_SPEED_72 3
embeddedartists 0:6b68dac0d986 32 #define SDRAM_SPEED_80 4
embeddedartists 0:6b68dac0d986 33
embeddedartists 0:6b68dac0d986 34 #define SDRAM_SPEED SDRAM_SPEED_60
embeddedartists 0:6b68dac0d986 35
embeddedartists 0:6b68dac0d986 36 #define SDRAM_CONFIG_32BIT
embeddedartists 0:6b68dac0d986 37 #define SDRAM_SIZE 0x2000000
embeddedartists 0:6b68dac0d986 38
embeddedartists 0:6b68dac0d986 39 #define SDRAM_BASE 0xA0000000 /*CS0*/
embeddedartists 0:6b68dac0d986 40
embeddedartists 0:6b68dac0d986 41 /* Initializes the SDRAM.
embeddedartists 0:6b68dac0d986 42 *
embeddedartists 0:6b68dac0d986 43 * The entire SDRAM will be made available to malloc per default.
embeddedartists 0:6b68dac0d986 44 *
embeddedartists 0:6b68dac0d986 45 * Note that this functions is called internally if malloc requests
embeddedartists 0:6b68dac0d986 46 * memory from SDRAM and that hasn't been disabled with a call to
embeddedartists 0:6b68dac0d986 47 * sdram_disableMallocSdram().
embeddedartists 0:6b68dac0d986 48 *
embeddedartists 0:6b68dac0d986 49 * @returns 0 on success, 1 on failure
embeddedartists 0:6b68dac0d986 50 */
embeddedartists 0:6b68dac0d986 51 uint32_t sdram_init();
embeddedartists 0:6b68dac0d986 52
embeddedartists 0:6b68dac0d986 53 /* Prevents malloc from using SDRAM.
embeddedartists 0:6b68dac0d986 54 *
embeddedartists 0:6b68dac0d986 55 * This function must be called before the first allocation that
embeddedartists 0:6b68dac0d986 56 * would have been in SDRAM. If a big allocation has already been
embeddedartists 0:6b68dac0d986 57 * made then this call will do nothing as the SDRAM will have been
embeddedartists 0:6b68dac0d986 58 * initialized and all SDRAM given to malloc.
embeddedartists 0:6b68dac0d986 59 */
embeddedartists 0:6b68dac0d986 60 void sdram_disableMallocSdram();
embeddedartists 0:6b68dac0d986 61
embeddedartists 0:6b68dac0d986 62 #endif /* end __SDRAM_H */
embeddedartists 0:6b68dac0d986 63 /****************************************************************************
embeddedartists 0:6b68dac0d986 64 ** End Of File
embeddedartists 0:6b68dac0d986 65 *****************************************************************************/
embeddedartists 0:6b68dac0d986 66
embeddedartists 0:6b68dac0d986 67