Utility to convert hex formatted ascii to binary system types.
Dependents: Nucleo_read_hyperterminale
Helper for parsing ASCII communications
Example
#include "mbed.h" #include "atoh.h" int main() { uint64_t result = atoh <uint64_t> ("0123456789abcdef" ); uint32_t lo = result & 0x00000000ffffffff; uint32_t hi = (result >> 32); printf( "0x%08X%08X\n", hi, lo ); printf( "0x%08X\n", atoh <uint32_t> ( "12345678" ) ); printf( "0x%04X\n", atoh <uint16_t> ( "1234" ) ); printf( "0x%02X\n", atoh <uint8_t> ( "12" ) ); }
atoh.cpp
- Committer:
- sam_grove
- Date:
- 2013-03-27
- Revision:
- 1:c590c304b2fa
- Parent:
- 0:fbac423fa3d4
File content as of revision 1:c590c304b2fa:
/** * @file atoh.cpp * @brief Convert an ASCII hex string to hexadecimal - seems like the * std library should include this... maybe it does. Just couldn't find it * @author sam grove * @version 1.0 * * Copyright (c) 2013 * * 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. */ #include "atoh.h" template<typename T> T atoh( char const *string ) { T value = 0; char ch = 0; uint8_t digit = 0, bail = sizeof(T) << 1; // loop until the string has ended while ( ( ch = *(string++) ) != 0 ) { // service digits 0 - 9 if ( ( ch >= '0' ) && ( ch <= '9' ) ) { digit = ch - '0'; } // and then lowercase a - f else if ( ( ch >= 'a' ) && ( ch <= 'f' ) ) { digit = ch - 'a' + 10; } // and uppercase A - F else if ( ( ch >= 'A' ) && ( ch <= 'F' ) ) { digit = ch - 'A' + 10; } // stopping where we are if an inapproprate value is found else { break; } // if the return is 8, 16, or 32 bits - only parse that amount if ( bail-- == 0 ) { break; } // and build the value now, preparing for the next pass value = (value << 4) + digit; } return value; } template uint8_t atoh <uint8_t> (const char* string ); template uint16_t atoh <uint16_t>(const char* string ); template uint32_t atoh <uint32_t>(const char* string ); template uint64_t atoh <uint64_t>(const char* string );