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10bit Right justified encoded char


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leeds

Thu Mar 06 2008, 12:55PM

Registered Member #6487

Joined: Thu Mar 06 2008, 11:54AM

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hello admin,

i have a problem reading the 10-bit right justified 2 byte data from the PIC. i'm using matlab to read the ADC. here is my PIC C code;

CODE:

main()

{

   long int adcValue;                     //16-bit A2D reading storage

   char adcHI, adcLO;                     //8-bit real time frames storage

   setup_adc_ports(A_ANALOG);             //set all ADC pins to analog

   setup_adc(ADC_CLOCK_INTERNAL);         //enable A2D module

   set_adc_channel(0);                    //read channel 0

   delay_us(20);                          //delay for sampling cap to charge

   while(TRUE)

   {

      adcValue = read_adc();                    //start conversion

      adcHI = (char)((adcValue>>5)& 0x1f);      // 0|0|0|d9|d8|d7|d6|d5

      adcLO = (char)((adcValue & 0x1f)|0x80);   // 1|0|0|d4|d3|d2|d1|d0

      putc(adcHI);                              // Transmit Byte 1 (d9...d5)

      putc(adcLO);                              // Transmit Byte 2 (d4...d0)

      delay_ms(5);                             //small delay before read

   }

}

using hyperterminal and other serial port monitors, i can get the ADC data. but with matlab it gives me the error: inputBufferSize must be greater than zero which means no data is in the port.

initialization of the serial port with the matlab code was made, serial object creation, serial settings; BaudRate @9600 as with the PIC,8bits, Parity=none

CODE:

 s = serial('COM1');

   fopen(s);

   set (s, 'BaudRate', 9600);

   data = fread(s,s.BytesAvailable);

   n = length(data);

i=1;

   while (i<n/2)

   {

   }

   end

   fclose(s);

   delete(s);

   clear(s);