crc

I'm currently working on a C program in the LPCXpresso (eclipse-based) tool-chain on Windows 7, an IDE with gcc targeting the an NXP Cortex M3 microprocessor. It provides a simple way to compile-link-program the microprocessor over JTAG. The result of a build is an AXF file (ELF format) that is loaded by a debug configuration. The loaded program resides in Flash memory from 0x00000 to 0x3FFFB. I'd like to include a 4-byte CRC-32 at 0x3FFFC to validate the program at start-up. I added another section and use the gcc __attribute__ directive to access that memory location. uint32_t crc32_build _

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Why in the world was _mm_crc32_u64(...) defined like this? unsigned int64 _mm_crc32_u64( unsigned __int64 crc, unsigned __int64 v ); The "crc32" instruction always accumulates a 32-bit CRC, never a 64-bit CRC (It is, after all, CRC32 not CRC64). If the machine instruction CRC32 happens to have a 64-bit destination operand, the upper 32 bits are ignored, and filled with 0's on completion, so there is NO use to EVER have a 64-bit destination. I understand why Intel allowed a 64-bit destination operand on the instruction (for uniformity), but if I want to process data quickly, I want a source

I have this byte array: static byte[] buf = new byte[] { (byte) 0x01, (byte) 0x04, (byte)0x00, (byte)0x01,(byte)0x00, (byte) 0x01}; Now, the CRC checksum of this byte array is supposed to be 0x60, 0x0A. I want the Java code to recreate this checksum, however I cant seem to recreate it. I have tried crc16: static int crc16(final byte[] buffer) { int crc = 0xFFFF; for (int j = 0; j < buffer.length ; j++) { crc = ((crc >>> 8) | (crc << 8) )& 0xffff; crc ^= (buffer[j] & 0xff);//byte to int, trunc sign crc ^= ((crc & 0xff) >> 4); crc ^= (crc << 12) & 0xffff; crc ^= ((crc & 0xFF) << 5) & 0xffff; }

i'm trying to implement Crc16 in C#. I already tried many different implementations, but most of them gives me different values. Here are some of the codes that i already used. private static int POLYNOMIAL = 0x8408; private static int PRESET_VALUE = 0xFFFF; public static int crc16(byte[] data) { int current_crc_value = PRESET_VALUE; for (int i = 0; i < data.Length; i++) { current_crc_value ^= data[i] & 0xFF; for (int j = 0; j < 8; j++) { if ((current_crc_value & 1) != 0) { current_crc_value = (current_crc_value >> 1) ^ POLYNOMIAL; } else { current_crc_value = current_crc_value >> 1; } } }

I'm trying to add CRC16 error detection to a Motorola HCS08 microcontroller application. My checksums don't match, though. One online CRC calculator provides both the result I see in my PC program and the result I see on the micro. It calls the micro's result "XModem" and the PC's result "Kermit." What is the difference between the way those two ancient protocols specify the use of CRC16? you can implement 16 bit IBM, CCITT, XModem, Kermit, and CCITT 1D0F using the same basic code base. see http://www.acooke.org/cute/16bitCRCAl0.html which uses code from http://www.barrgroup.com/Embedded