Guys,

How can I get byte_length from Rx port ?

Thanks

Is it posibble doing this :

byte_length=c;
         for (i=0;i<byte_length;i++)
               {
                 RxdataBuff[i] = c;    // Get a character from UART RX data register
               }   

It is possible to write a string of characters (multiple bytes) into a TX. But not the same with RX.\

The RX has a buffer that can hold only 1 byte of information, and can read only one byte at a time.

If you want to get the byte count, you have to keep reading the data from the buffer, one byte at at time.

You can give this a try:

while (UART_bReadRxStatus() & UART_RX_REG_FULL)) // keeps looping as long as there is data in the RX buffer

{

if (UART_cReadChar()) RXcount++;  //_cReadChar reads one character from buffer, returns 0 if there's an error or no data

}

How can I detect Rx buffer with content :

AB 04 01 04 00

??

can I do :

byte_length=UART_1_cGetChar();
                       
                        for (i=0;i<byte_length;i++)
                            {
                                                    RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
                            }
                           
                                    LCD_1_Position(0,0);
                                    LCD_1_PrCString("SN: ");
                                    LCD_1_Position(1,0);

                                    for (i=0;i<10;i++)
                                    {           
                                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                                    }       

while (UART_bReadRxStatus() & UART_RX_REG_FULL)) // keeps looping as long as there is data in the RX buffer

{

if (UART_cReadChar()) RXcount++;  //_cReadChar reads one character from buffer, returns 0 if there's an error or no data

}

It's not a valid working code......

You need to enable the command buffer and define the command terminator.

Then using the code below it should work

if(!UART_bCmdCheck() ){

So it'll be like this :

                                            if(!UART_bCmdCheck() ){
                                               byte_length = UART_bCmdLength();
                                            }

                    
                        for (i=0;i<byte_length;i++)
                            {
                                                    RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
                            }
                          
                                    LCD_1_Position(0,0);
                                    LCD_1_PrCString("SN: ");
                                    LCD_1_Position(1,0);

                                    for (i=0;i<10;i++)
                                    {          
                                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                                    } 

How can I enable the command buffer and define the command terminator ?

Can you give me example ? thank you

I can't see command terminator since it's a reply from device......for 5 to 10 bytes.

How can I create it ?

Please find my manual attached, and it's on "Basic Command Description"

Thanks a lot

The logic :

I gave command to device and it replied with AB 04 01 04 00 on Rx port, how can I parse it so I can display them into LCD ?
thank you

 To enable the command buffer, there is a parameter that you define to enable.

Could you re-attached the manual?

The reply must formatted in some way, like an address and a data byte plus a checksum or anything else. If the reply sequence always end with a different value then after a pre-difined time has elapsed retrieve the data from the command buffer.

Regards

You can define the command terminator in the UART user module parameters window, and enable the RX command buffer option. RX interrupts must be enabled.

From the datasheet-

To enable the command buffer, there is a parameter that you define to enable.

Could you re-attached the manual?

The reply must formatted in some way, like an address and a data byte plus a checksum or anything else. If the reply sequence always end with a different value then after a pre-difined time has elapsed retrieve the data from the command buffer.

Regards

Yes sure, I'll attach the manual again.

if you're talking about checksum, make more sense for me since I read about it on the manual but don't know how to use it yet.

I need to check the end of the reply (Rx), but from I can see it's always changing.....

I can print out Rx, but still random. What I want, is if I give command AB 02 01,

device will reply AB 04 01 04 00, please see page 5 on the manual.

Can I do like this :

while(1)
    {
       do {

                                UART_1_CmdReset();                // Reset Command Buffer
            for (i=0;i<2;i++) //repeat command 15 times
              {
                for (i=0;i<3;i++)   
                {
                    UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
                }
                  Delay50uTimes(1);

             }
               
                c = UART_1_cGetChar();
           
         }while (c == 0);
            byte_length = UART_1_cGetChar();
         for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }   
        if (RxdataBuff[0] == 0xAB)//check the first character
        {
         
         switch(RxdataBuff[1])            // Check status byte
            {
                case 0x04:            // If 0x04 : Operation success
                    LCD_clr_line(0); //clear LCD screen
                      LCD_clr_line(1);

                    LCD_1_PrCString("Card Selected");    // Print "Card selected" on the LCD  ;
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
                    break;
               
                case 0x02:            // If 0x02 : Operation fail
                    LCD_clr_line(0); //clear LCD screen
                      LCD_clr_line(1);

                    LCD_1_PrCString("Operation failed");    // Print "Card selected" on the LCD  ;
                           
                    break;
   
             }//end switch
        }//end if
    }
 } 

from this code,

it's responding to AB 02 01 perfecty,

when I can not display in orderly manner on hex byte ( still raw ), because I can't determine how many bytes to be read

=============
    while(1)
    {
       do {

                                UART_1_CmdReset();                // Reset Command Buffer
           
             
                for (i=0;i<15;i++)   
                {
                    UART_1_PutChar(0x01); // Send a character to UART TX port
                }
                  Delay50uTimes(1);

             
               
                c = UART_1_cGetChar();
           
         }while (c == 0);
           
                        
        if (c == 0x01)//check the card available
        {
         LCD_clr_line(0);
         LCD_clr_line(1);
         LCD_1_Position(0,0);
         LCD_1_PrCString("Card in ");
         UART_1_CmdReset();                // Reset Command Buffer
           for (i=0;i<3;i++)   
                {
                    UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
                }
            byte_length = UART_1_cGetChar();
            /*
            for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }

// Please help on how to read the byte length and parse it ?
            */
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(byte_length); // Print serial number of the card detected
                    }                   
         
        }//end if 0x01
    }//end while

I try this one and returning some bytes, but not sure if it's right or not

while(1)
    {
       do {

                                UART_1_CmdReset();                // Reset Command Buffer
           
             
                for (i=0;i<15;i++)   
                {
                    UART_1_PutChar(0x01); // Send a character to UART TX port
                }
                  Delay50uTimes(1);

             
               
                c = UART_1_cGetChar();
           
         }while (c == 0);
           
                        
        if (c == 0x01)//check the card available
        {
         LCD_clr_line(0);
         LCD_clr_line(1);
         LCD_1_Position(0,0);
         LCD_1_PrCString("Card in ");
         UART_1_CmdReset();                // Reset Command Buffer
           for (i=0;i<3;i++)   
                {
                    UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
                }
               
                  if(!UART_1_bCmdCheck() )
                  {
                      byte_length = UART_1_bCmdLength();
                  }
           
           
            for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }
           
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=2;i<6;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
         
        }//end if 0x01
    }//end while
 }//end main

what shoud I put for command terminator ? I can't see what's the end of the Rx...??

if the return is : AB 04 01 04 00  ......what's the command terminator ?

00 ??

Please have a look on the video :

http://s129.photobucket.com/user/picture_77/media/RFID_zps0aef3a5d.mp4.html

I used :

      byte_length = UART_1_cReadChar();
            

The code :

while(1)
    {
       do {

                                UART_1_CmdReset();                // Reset Command Buffer
           
             
                for (i=0;i<15;i++)   
                {
                    UART_1_PutChar(0x01); // Send a character to UART TX port
                }
                  Delay50uTimes(1);

             
               
                c = UART_1_cGetChar();
           
         }while (c == 0);
           
                        
        if (c == 0x01)//check the card available
        {
         LCD_clr_line(0);
         LCD_clr_line(1);
         LCD_1_Position(0,0);
         LCD_1_PrCString("Card in ");
         UART_1_CmdReset();                // Reset Command Buffer
           for (i=0;i<3;i++)   
                {
                    UART_1_PutChar(sel_card[i]); // Send a character to UART TX port
                }
                /*
                  if(!UART_1_bCmdCheck() )
                  {
                      byte_length = UART_1_bCmdLength();
                  }
                  */
                   byte_length = UART_1_cReadChar();
                 
           
           
            for (i=0;i<byte_length;i++)
            {
                RxdataBuff[i] = UART_1_cGetChar();    // Get a character from UART RX data register
            }
           
                    LCD_1_Position(1,0);
                    LCD_1_PrCString("SN: ");
                    for (i=0;i<4;i++)
                    {           
                        LCD_1_PrHexByte(RxdataBuff[i]); // Print serial number of the card detected
                    }                   
         
        }//end if 0x01
          else
         if (c == 0xFE)
         {
           LCD_clr_line(0);
           LCD_clr_line(1);
           LCD_1_Position(1,0);
           LCD_1_PrCString("No Card! ");

         }//end 0xFE
    }//end while
 }//end main

The respond description :

In the protocol you use there is no command terminator, so you can't use the command buffer.

I tested with serial port and RS232 in computer

I send AB 02 01 and the response is AB 04 01 04 00

but in cypress I get a different response it's not AB 04 01 04 00.....why is that ????????????????????????