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Dependencies: DM_FATFileSystem DM_HttpServer DM_USBHost EthernetInterface USBDevice mbed-rpc mbed-rtos
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Diff: crc.cpp
- Revision:
- 11:dedcebcfc869
- Child:
- 29:b1ec19000e15
diff -r 1ac4b213f0f7 -r dedcebcfc869 crc.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/crc.cpp Fri Dec 19 09:03:46 2014 +0100 @@ -0,0 +1,85 @@ +/* + * Copyright 2014 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. + */ + + +/****************************************************************************** + * Includes + *****************************************************************************/ + +#include "mbed.h" +#include "crc.h" + + +/****************************************************************************** + * Defines and typedefs + *****************************************************************************/ + +#define NUM_CRC_BUFF_ENTRIES (100) + +#define CRC32_INIT() do { LPC_CRC->MODE = 0x00000036; LPC_CRC->SEED = 0xffffffff; } while(0) + +#define CRC32_WRITE8(__val) LPC_CRC->WR_DATA_BYTE.DATA = (uint8_t)(__val) +#define CRC32_WRITE16(__val) LPC_CRC->WR_DATA_WORD.DATA = (uint16_t)(__val) +#define CRC32_WRITE32(__val) LPC_CRC->WR_DATA_DWORD.DATA = (__val) + +#define CRC32_SUM() LPC_CRC->SUM + +/****************************************************************************** + * External global variables + *****************************************************************************/ + +/****************************************************************************** + * Local variables + *****************************************************************************/ + +/****************************************************************************** + * Local Functions + *****************************************************************************/ + + +/****************************************************************************** + * Public Functions + *****************************************************************************/ + +uint32_t crc_File(FILE* f) +{ + uint32_t* buff = (uint32_t*)malloc(sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES); + if (buff != NULL) { + CRC32_INIT(); + fseek(f, 0, SEEK_SET); + memset(buff, 0, sizeof(uint32_t)*NUM_CRC_BUFF_ENTRIES); + int numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f); + while (numRead > 0) { + for (int i = 0; i < numRead; i++) { + CRC32_WRITE32(buff[i]); + } + numRead = fread(buff, sizeof(uint32_t), NUM_CRC_BUFF_ENTRIES, f); + } + free(buff); + return CRC32_SUM(); + } + return 0; +} + +uint32_t crc_Buffer(const uint32_t* data, uint32_t size) +{ + CRC32_INIT(); + for (int i = 0; i < size; i++) { + CRC32_WRITE32(data[i]); + } + return CRC32_SUM(); +} +