John Mitchell / DMSupport

Subdirectory provided by Embedded Artists

Dependencies:   DM_FATFileSystem DM_HttpServer DM_USBHost EthernetInterface USBDevice mbed-rpc mbed-rtos mbed-src

Dependents:   lpc4088_displaymodule_hello_world_Sept_2018

Fork of DMSupport by Embedded Artists

crc.cpp@41:ac490f69398f, 2018-10-04 (annotated)

Committer:
jmitc91516
Date:
Thu Oct 04 08:30:19 2018 +0000
Revision:
41:ac490f69398f
Parent:
29:b1ec19000e15 
To demonstrate a problem with the dm_board_config.h file - the project will not build if it is in its normal place in the root directory, but builds OK if I copy it to the DMSupport subdirectory.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
embeddedartists 11:dedcebcfc869 1 /*
embeddedartists 11:dedcebcfc869 2 * Copyright 2014 Embedded Artists AB
embeddedartists 11:dedcebcfc869 3 *
embeddedartists 11:dedcebcfc869 4 * Licensed under the Apache License, Version 2.0 (the "License");
embeddedartists 11:dedcebcfc869 5 * you may not use this file except in compliance with the License.
embeddedartists 11:dedcebcfc869 6 * You may obtain a copy of the License at
embeddedartists 11:dedcebcfc869 7 *
embeddedartists 11:dedcebcfc869 8 * http://www.apache.org/licenses/LICENSE-2.0
embeddedartists 11:dedcebcfc869 9 *
embeddedartists 11:dedcebcfc869 10 * Unless required by applicable law or agreed to in writing, software
embeddedartists 11:dedcebcfc869 11 * distributed under the License is distributed on an "AS IS" BASIS,
embeddedartists 11:dedcebcfc869 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
embeddedartists 11:dedcebcfc869 13 * See the License for the specific language governing permissions and
embeddedartists 11:dedcebcfc869 14 * limitations under the License.
embeddedartists 11:dedcebcfc869 15 */
embeddedartists 11:dedcebcfc869 16
embeddedartists 11:dedcebcfc869 17
embeddedartists 11:dedcebcfc869 18 /******************************************************************************
embeddedartists 11:dedcebcfc869 19 * Includes
embeddedartists 11:dedcebcfc869 20 *****************************************************************************/
embeddedartists 11:dedcebcfc869 21
embeddedartists 11:dedcebcfc869 22 #include "mbed.h"
embeddedartists 11:dedcebcfc869 23 #include "crc.h"
embeddedartists 11:dedcebcfc869 24
embeddedartists 11:dedcebcfc869 25
embeddedartists 11:dedcebcfc869 26 /******************************************************************************
embeddedartists 11:dedcebcfc869 27 * Defines and typedefs
embeddedartists 11:dedcebcfc869 28 *****************************************************************************/
embeddedartists 11:dedcebcfc869 29
embeddedartists 11:dedcebcfc869 30 #define NUM_CRC_BUFF_ENTRIES (100)
embeddedartists 11:dedcebcfc869 31
embeddedartists 11:dedcebcfc869 32 #define CRC32_INIT() do { LPC_CRC->MODE = 0x00000036; LPC_CRC->SEED = 0xffffffff; } while(0)
embeddedartists 11:dedcebcfc869 33
embeddedartists 11:dedcebcfc869 34 #define CRC32_WRITE8(__val) LPC_CRC->WR_DATA_BYTE.DATA = (uint8_t)(__val)
embeddedartists 11:dedcebcfc869 35 #define CRC32_WRITE16(__val) LPC_CRC->WR_DATA_WORD.DATA = (uint16_t)(__val)
embeddedartists 11:dedcebcfc869 36 #define CRC32_WRITE32(__val) LPC_CRC->WR_DATA_DWORD.DATA = (__val)
embeddedartists 11:dedcebcfc869 37
embeddedartists 11:dedcebcfc869 38 #define CRC32_SUM() LPC_CRC->SUM
embeddedartists 11:dedcebcfc869 39
embeddedartists 11:dedcebcfc869 40 /******************************************************************************
embeddedartists 11:dedcebcfc869 41 * External global variables
embeddedartists 11:dedcebcfc869 42 *****************************************************************************/
embeddedartists 11:dedcebcfc869 43
embeddedartists 11:dedcebcfc869 44 /******************************************************************************
embeddedartists 11:dedcebcfc869 45 * Local variables
embeddedartists 11:dedcebcfc869 46 *****************************************************************************/
embeddedartists 11:dedcebcfc869 47
embeddedartists 11:dedcebcfc869 48 /******************************************************************************
embeddedartists 11:dedcebcfc869 49 * Local Functions
embeddedartists 11:dedcebcfc869 50 *****************************************************************************/
embeddedartists 11:dedcebcfc869 51
embeddedartists 11:dedcebcfc869 52
embeddedartists 11:dedcebcfc869 53 /******************************************************************************
embeddedartists 11:dedcebcfc869 54 * Public Functions
embeddedartists 11:dedcebcfc869 55 *****************************************************************************/
embeddedartists 11:dedcebcfc869 56
embeddedartists 11:dedcebcfc869 57 uint32_t crc_File(FILE* f)
embeddedartists 11:dedcebcfc869 58 {
embeddedartists 11:dedcebcfc869 59 uint32_t* buff = (uint32_t*)malloc(sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES);
embeddedartists 11:dedcebcfc869 60 if (buff != NULL) {
embeddedartists 11:dedcebcfc869 61 CRC32_INIT();
embeddedartists 11:dedcebcfc869 62 fseek(f, 0, SEEK_SET);
embeddedartists 11:dedcebcfc869 63 memset(buff, 0, sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES);
embeddedartists 11:dedcebcfc869 64 int numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f);
embeddedartists 11:dedcebcfc869 65 while (numRead > 0) {
embeddedartists 11:dedcebcfc869 66 for (int i = 0; i < numRead; i++) {
embeddedartists 11:dedcebcfc869 67 CRC32_WRITE32(buff[i]);
embeddedartists 11:dedcebcfc869 68 }
embeddedartists 11:dedcebcfc869 69 numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f);
embeddedartists 11:dedcebcfc869 70 }
embeddedartists 11:dedcebcfc869 71 free(buff);
embeddedartists 11:dedcebcfc869 72 return CRC32_SUM();
embeddedartists 11:dedcebcfc869 73 }
embeddedartists 11:dedcebcfc869 74 return 0;
embeddedartists 11:dedcebcfc869 75 }
embeddedartists 11:dedcebcfc869 76
embeddedartists 11:dedcebcfc869 77 uint32_t crc_Buffer(const uint32_t* data, uint32_t size)
embeddedartists 11:dedcebcfc869 78 {
embeddedartists 11:dedcebcfc869 79 CRC32_INIT();
embeddedartists 29:b1ec19000e15 80 for (uint32_t i = 0; i < size; i++) {
embeddedartists 11:dedcebcfc869 81 CRC32_WRITE32(data[i]);
embeddedartists 11:dedcebcfc869 82 }
embeddedartists 11:dedcebcfc869 83 return CRC32_SUM();
embeddedartists 11:dedcebcfc869 84 }
embeddedartists 11:dedcebcfc869 85