Hi Lubin!



Could You check connections of pin AN7 and AN3 in your blockset? It's very strange, but when I want to convert AN7 analog input, dsPIC is converting different value than it's real. I checked all connections in my PCB and that value is on pin AN3. Is this possible, AN3 and AN7 are changed places?



Blockset version 0.98

Hi Nigma,



This would be quite surpising to have an inversion on pin AN7 ==> AN3.

Could you upload the model (.mdl file) so as to have a look ?

What are the parameters for Vref+ and Vref- ?



Lubin

I used AVdd - AVss.

The generated code for the configuration of the ADC with your model is :

<i>
</i>  124     /* S-Function "dsPIC_ADC" initialization Block: <Root>/ADC Input */
  125     /* Initialise ADC converter */
  126     /* 0 mean each 1 conversion */
  127   #define NoSamplesADC                   1
  128   #define ADCSval                        3
  129   #define SAMCval                        (1 << 8)
  130   #define OutFormatBitsval               (0 << 8)
  131   #define VoltRef                        (0 << 13)
  132   
  133     
  134     ADCON1 = 0x00E4 | (0 << 10)| OutFormatBitsval;
  135     ADCON2 = 0x0400 | (NoSamplesADC << 2) | VoltRef;
  136     ADCSSL = 144;
  137     ADCON3 = (ADCSval | SAMCval) & 0xff7f;
  138     ADCHS = 0x0000;
  139     IPC2 = (IPC2 | (6 << 12));           /*Interrupt Priority : 6*/
  140     _ADIF = 0;
  141   
  142  
  143   
  144   
  145     /* Turn on ADC Module */
  146     ADCON1bits.ADON= 1;

To read the converted values, the code is :

<i>
</i>   39       /* S-Function "ADC" Block: <Root>/ADC Input */
   40       Gyro_test_B.ADCInput_o1 = ADCBUF0;
   41       Gyro_test_B.ADCInput_o2 = ADCBUF1;

If there is something wrong with that, I would be glad to correct it.