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I need to take a piece of code written in C for creating a CRC8 and turn it into a function in VB6. I want to be able to input 2 digit string values representing hex values (STX, Keyboard number, Lamp number, Command number, ETX and it to produce the CRC.

For example:-

82 60 00 00 83 would give DA

82 60 00 04 83 would give 42

82 60 00 22 83 would give B9

82 60 00 2F 83 would give 54

The C code is below:

The following section of the program explains the calculation of the CRC character. The type U8 is a 8 bit variable unsigned integer (0 through 255)

The function put_tx1_buffer ( U8 c ) send the characters via the serial interface.

#define POLYNOM 0xB1 // 28+27+25+24+20+1

#define INIT_TX_CRC {tx_crc=0xA5;} U8 tx_crc ;

void build_tx_crc8( U8 a )


U8 i=8 ;



if (( a & 0x01 ) != ( tx_crc & 0x01 ))


tx_crc >>= 1 ;

tx_crc ^= POLYNOM ;




tx_crc >>= 1 ;


a >>= 1 ;


while (--i!=0) ;


void set_lamp( U8 keyboardnumber, U8 lampnumber, U8 command )



put_tx1_buffer( STX+0x80 ) ;

build_tx_crc8( STX+0x80 ) ;

put_tx1_buffer( command ) ;

build_tx_crc8( command ) ;

put_tx1_buffer( keyboardnumber ) ;

build_tx_crc8( keyboardnumber ) ;

put_tx1_buffer( lampnumber ) ;

build_tx_crc8( lampnumber ) ;

put_tx1_buffer( ETX+0x80 ) ;

build_tx_crc8( ETX+0x80 ) ;

put_tx1_buffer( tx_crc ) ;


Compétences : Programmation C, Visual Basic

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Concernant l'employeur :
( 2 commentaires ) Forest Hill, United Kingdom

N° du projet : #14889411

Décerné à :


Hello. I have much experience in converting code from one programming language to another programming language, including converting C/C++ to VB6. I know both programming languages very well and I know significant diff Plus

£7 GBP / heure
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7 freelance font une offre moyenne de £8/heure pour ce travail


Hello, I am a professional software developer proficient in C and VB6. I have read your project requirement, and i can quickly convert your C code to VB6 application. Or i can create a VM6 application to calculate CRC8 Plus

£10 GBP / heure
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Hello, How are you? I have read your project description carefully I am very interested in this project. I have a lot of experience in this type of work. I'm sure I can complete it on time with high quality acco Plus

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Hello,Sir High-Quality+fast development+good credit+fast communication=My work method! My first aim is to provide you quality and professional task. i have developed for 7 years on freelancer.com. This is my new Ac Plus

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Greetings!I hope you are doing well. I have read your proposal and i have keen interest to work with you because my experience and my knowledge meet your requirements. I will provide good quality of work. Definately y Plus

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Hi. I am a Senior VB6, VB.NET Developer living in Paris, I have read your specifications and i want to realize your application. i have already developed several applications you can find in my folio. I need more Plus

£11 GBP / heure
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£5 GBP / heure
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