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XC164CS-32 port problems

Hello,

I'm using the XC164CS-32, 40 MHz, and I'm experiencing some problems with the ASC0 port where it seems that its not synchronizing with the program I wrote in C#. The application I wrote will send out at least 6 ASCII characters, but no more than 9.

#define TIMEOUT_100MS                                   31250
#define EBCMOD0_SETTING                                 0x1820
#define EBCMOD1_SETTING                                 0x003F
#define FCONCS1_SETTING                                 0x0031u
#define TCONCS1_SETTING                                 0x0181u
#define ADDRSEL1_SETTING                                0xB000u

#define PORT1_HIGH_DIRECTION_SETTINGS   0x0F
#define PORT1_LOW_DIRECTION_SETTINGS    0xFF
#define PORT3_DIRECTION_SETTINGS                0xB620
#define PORT4_DIRECTION_SETTINGS                0x00FC
#define PORT9_DIRECTION_SETTINGS                0x0001

#define SYS_RDY                                                 P1H_P0



void main(void)

{




        char temp_string[9] = "\0";
        char label[3] = "";
        int i = 0;




        ASC0_FDV = 0x003B;      /* load ASC0 fractional divider register */
        ASC0_BG = 0x000E;       /* load ASC0 baud rate time reload register */
        ASC0_CON = 0x88D1;      /* load ASC0 control register */
        DP1L = PORT1_LOW_DIRECTION_SETTINGS;
         DP1H = PORT1_HIGH_DIRECTION_SETTINGS;




        ALTSEL0P3 = 0x2720;
        ASC0_TIC = 0x01B9u;
        ASC0_RIC = 0x01F9;
        DP3 = 0xB620;
        P3_P10 = 1;
        P1H_P3 = 0; /* Disable the loopback relays */
        ASC0_RXFCON = 0x0607;
        ASC0_RXFCON = 0x0605;
        GPT12E_T3CON_T3R = 1;  /* Start the timer T3 */
        printf ("Initialized\n");
        setup();
        update();


        while (1)
    {
        if (GPT12E_T3 > TIMEOUT_100_MS)
                {
                        GPT12E_T3 = 0; /* Reset the timer */
                        update();
                }

                  // if ( (ASC0_FSTAT & 0x0F) != 0)
                if ( (ASC0_FSTAT & 0x0F) > 6)
            {

                    gets(temp_string, 9);

                        if (strcmp(temp_string, "status") == 0)
                                printstat();

                        else if (strlen(temp_string) < 8)
                        {
                                printf("sync error. purging RX buffer...\n\n");
                                for (i = 0; i < 100; i++)
                                        ASC0_RBUF = 0x0;

                                ASC0_RXFCON = 0x0607;
                                ASC0_RXFCON = 0x0605;
                        }

                        else
                        {




                                label[0] = temp_string[6];
                                label[1] = temp_string[7];
                                label[2] = '\0';




                            printf("\nInput: %s \n", temp_string);
                                printf("\nhex label: %s \n",label);




                                if (strcmp(label,"38") == 0)
                                {
                                         // some code
                                }




                                if (strcmp(label,"72") == 0)
                                {
                                         // some code
                                }




                                if (strcmp(label,"8A") == 0)
                                {
                                         // some code
                                }




                        strcpy(label,"");
                        ASC0_RXFCON = 0x0607;
                        ASC0_RXFCON = 0x0605;




            }




        }




}

My problem lies in the following IF statement:

if (ASC0_FSTAT & 0x000F) != 0)

For some strange reason, it's not getting the first two characters that I send to it via RS232 and it seems to be some kind of synchronization problem.

I thought I would change the situation by replacing the != 0, but when I try making it greater than 6 (> 6), it will hang and will no received data is coming in.

Does any one see a problem and can help me out?

Steve

Parents

0 Sauli Porttila over 17 years ago in reply to ImPer Westermark

You really should figure it out yourself, but you can try out these to prove yourself that the serial interface actually does work. It took me a few minutes to write them and I certainly have not tested them, not even compiled. From experience I know that it is all too easy to put in a mistake in the most simple piece of code.

unsigned int receive_line( char *buf, unsigned int bufsize)
{
   unsigned int count;

   /* Cannot read anything into a nonexistent or
      zero sized buffer. */
   if( ( buf == NULL) || (bufsize == 0))
   {
      return 0;
   }

   /* Must have space for the terminating NUL. */
   bufsize--;

   /* Read no more characters than fits in the buffer. */
   for( count = 0; count < bufsize; count++)
   {
      /* Wait for a character. */
      while( (ASC0_FSTAT & 0x0F) == 0)
      {
         ;
      }

      /* Read it to the buffer. */
      buf[ count] = ASC0_RBUF;

      /* If newline, we are done.
         Newline is not saved. */
      if( buf[ count] == '\n')
      {
         break;
      }
   }

   /* Terminate the line. */
   buf[ count] = '\0';

   /* Return number of characters read. */
   return count;
}

void send_line( char *buf)
{
   /* Cannot send anything from a nonexistent buffer. */
   if( buf != NULL)
   {
      /* While not end of string.. */
      while( *buf != '\0')
      {
         /* Wait for room in the transmit FIFO. */
         while( (ASC0_FSTAT & 0xF00) == 0x800)
         {
            ;
         }




         /* Send the character. */
         ASC0_TBUF = *buf++;
      }
   }
}

After you have these working, you could start figuring out how to do it with interrupts. Sooner or later you will want to do something useful with the time wasted in these two routines.

Sauli

Reply

0 Sauli Porttila over 17 years ago in reply to ImPer Westermark

unsigned int receive_line( char *buf, unsigned int bufsize)
{
   unsigned int count;

   /* Cannot read anything into a nonexistent or
      zero sized buffer. */
   if( ( buf == NULL) || (bufsize == 0))
   {
      return 0;
   }

   /* Must have space for the terminating NUL. */
   bufsize--;

   /* Read no more characters than fits in the buffer. */
   for( count = 0; count < bufsize; count++)
   {
      /* Wait for a character. */
      while( (ASC0_FSTAT & 0x0F) == 0)
      {
         ;
      }

      /* Read it to the buffer. */
      buf[ count] = ASC0_RBUF;

      /* If newline, we are done.
         Newline is not saved. */
      if( buf[ count] == '\n')
      {
         break;
      }
   }

   /* Terminate the line. */
   buf[ count] = '\0';

   /* Return number of characters read. */
   return count;
}

void send_line( char *buf)
{
   /* Cannot send anything from a nonexistent buffer. */
   if( buf != NULL)
   {
      /* While not end of string.. */
      while( *buf != '\0')
      {
         /* Wait for room in the transmit FIFO. */
         while( (ASC0_FSTAT & 0xF00) == 0x800)
         {
            ;
         }




         /* Send the character. */
         ASC0_TBUF = *buf++;
      }
   }
}

After you have these working, you could start figuring out how to do it with interrupts. Sooner or later you will want to do something useful with the time wasted in these two routines.

Sauli

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