Contigious writing using 1632C

Sri · 2010-08-04 10:49

Hi,
i am using 1632C. i am using 24X16 Led Matrix Display. i sent all the data in successive address writing. i can view the data that i am sending. when i keep the data in continous loop, i found that data is getting shifted. it is not periodical. it is Random. i kept 500ms delay for writing of data. there is no flickering. everything is fine. But only the thing is data is shifting in group of locations. the locations group is also random. the data which i am displaying is sent to hyper terminal. i found the data is correct. Can u please give me the suggestion. i am at the completion of the project.

rgds
srikanth.

Franklin · 2010-08-04 15:57

Attaching your code would be a good start.

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- Stephen

Sri · 2010-08-05 10:45

void HT632Init(void)
{


    ChipEnable(CS1);    //Enable Chip/ IC 1 for configuration purpose
    
    ControlComndIssue();

    ComandData(0x001);  // master sysdis
    ComandData(0x048);      //Nmos for 1632c
    ComandData(0x142); // PWM settings
    ComandData(0x030);    // master mode
    ComandData(0x003); //system Enable   
    ComandData(0x007);  // LED on
    ComandData(0x011); //blink led off
    
    
    ChipDisable(CS1);  // Disable IC for write protect
    
    DelaymS(1);    
    DelaymS(1);    
    
}

void ControlComndIssue(void)
{
        WRLOW;
    DelaymS(1);
    DATAHIGH;  //1 Data High issue as a First bit of command
    DelaymS(1);   

    WRHIGH;    //Make WR pin High
    DelaymS(1);   
      
       WRLOW;   //Make WR pin Low
    DelaymS(1);
    DATALOW;  //Make Data Pin Low 
    DelaymS(1);   

    WRHIGH;//Make WR pin High
    DelaymS(1);   

    WRLOW; //Make WR pin Low
    DelaymS(1);
    DATALOW;  //Make Data pin low 
    
    DelaymS(1);   

    WRHIGH; //Make WR pin high
    DelaymS(1);   
}

void ControlDataIssue(void)            //This function is called before the data is placed.
 {
      WRLOW;
    DelaymS(1);
    DATAHIGH;  //1 Data High issue as a First bit of command
    DelaymS(1);   

    WRHIGH;
    DelaymS(1);   
      
       WRLOW;
    DelaymS(1);
    DATALOW;  //0 
    DelaymS(1);   

    WRHIGH;
    DelaymS(1);   

    WRLOW;
    DelaymS(1);
    DATAHIGH; //1
    DelaymS(1);   

    WRHIGH;
    DelaymS(1); 
 }

void ComandData(unsigned int CmdData)
{
    int BitCount;              
    for(BitCount=9; BitCount>0; BitCount--)    
    {
        WRLOW;    
        DelaymS(1);   
    
        if(CmdData & 0x100)
            DATAHIGH;
        else
            DATALOW;              
        DelaymS(1);   
        WRHIGH;
        DelaymS(1);   
        CmdData <<= 1;       
    }                     
}

void HT1632AddresSend(unsigned char ADD)
{          
//    char AddressDataBit;
    unsigned char Addrs = ADD;

    for(AddressDataBit=7; AddressDataBit>0; AddressDataBit--)    
    {  
        WRLOW;
          DelaymS(1);

        //Send Address Bit by Bit , MSB first

        if(Addrs & 0x40)
            DATAHIGH;
        else
            DATALOW;
        
        DelaymS(1);
        WRHIGH;    
        DelaymS(1);                  
        Addrs <<= 1;  
    }    

    
}

void HT1632DataWrite(unsigned char data)
{          
    char AddressDataBit;
    unsigned char DataNibble = data;            
    for(AddressDataBit=4; AddressDataBit>0; AddressDataBit--)    
    {
        WRLOW;
        DelaymS(1);        
        // Send Data Bit by Bit to IC, LSB first
        if(DataNibble & 0x01)
                DATAHIGH;
        else
                DATALOW;
        
        DelaymS(1);
        WRHIGH;
        DelaymS(1);
        DataNibble >>= 1;     
    }        
}

void main(void)
{
HT632Init();
ControlDataIssue();
HT1632AddresSend(0);
    for (Addr=0x00;Addr<=0X5f;Addr++)     //the size of the digit 5f
    {    
    
        HT1632DataWrite(Data);
    }
}

T&E Engineer · 2010-08-05 11:31

Since you provided C code and you are in a Basic Stamp forum, there's one issue there. What microcomtroller are you using? If you do a search on the Paralax forums (in particular the SX forum) for the key word HT1632 or HT1632C you will see some of my code and others. One issue I saw was that Sure Electronics sells a couple of displays that used the obsolete HT1632 chip and have now gone to the current HT1632C chip. There are some differences in the coding that you can not get HT1632 code to work on a HT1632C chip. I think it's the master or reset command that's one difference. If you do the search on the forum for HT1632C you will see a post from me that describes the differences.

T&E Engineer · 2010-08-05 12:17

http://forums.parallax.com/showthread.php?p=867334

Take a look at this and it will provide the coding changes between the HT1632 and the HT1632C

Sri · 2010-08-09 03:21

i gone through the changes before starting the project. the display is working fine. but the only problem is the data is shifting at random intervals (ex: 2mins, 1 min/ start of the display). it is not sequential or periodical. i am writing the data in successive addressing mode. the procedure i am following after the initialization is. i am issuing command, initial address (0) and subsequent data.
i am using the controller Luminary make LM3S3748

Sri · 2010-08-09 03:34

I gone through the changes before starting the project. the display is working fine. but the only problem is the data is shifting at random intervals (ex: 2mins, 1 min/ start of the display). it is not sequential or periodical. i am writing the data in successive addressing mode. the procedure i am following after the initialization is. i am issuing command, initial address (0) and subsequent data.
i am using the controller Luminary make LM3S3748

Contigious writing using 1632C

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