PSoC™ 5, 3 & 1 Forum Discussions

 Hi, I am developing a medicine  application which includes a programmed Cypress CY8C27443-24PXi integrated circuit. I have been trying to use  it  on a protoboard instead of the PSoC itself for space purpose. I have found  out that, after programming it and putting it on my protobard  to test it, it  does not work. I have put the power lines properly and checked  the pin out diagram for the correct input and output ports but it seems like it does not want  to work at all. I put it  back  to the PSoC  and connect  it to my protoboard with some jumpers  and works just right. Is there something that needs to be considered for the IC to work out of the plataform on a protoboard or on a PCB  desing?

Any help would be appreciated.

Thanks.

Juan Luis Gantus Bernés.

9th. Semester Student  of Biomedical Engieering.

I am commencing a design that will require the SAR ADC to run almost full 1 Msample per sec while sequencing across 8 channels. Is this realistic as far as channel-to-channel crosstalk, settling time to 12 bit accuracy, etc?

Anyone with experience doing this and verifying performance?

Cheers,

  Chuck

Hello,

I am just starting with CY8CKIT-050 Development Kit.

I am using two SAR-ADC (Sampling frequency 100 kHz) and some time-critical calculation in a hight priority interrupt service routine (prio 0). Everything works fine until I implement an additional interrupt service (rising edge @ 10Hz, priority 7) to set a flag for further processing. This further processing is done in den main-loop and sends some data to the display.

When the the low level interrupt is enabled, I measure a Jitter (about 1.3us) in the signal processing in the high-priority interrupt service routine.

This is done with a toggle Bit as digital output at the end of the routine. The service routine is triggered by eoc of one ADC and needs about 4 us for the signal processing (without code optimization).

The reason for this Jitter is the code in the main loop (LCD functions) :

CY_ISR(DISP_ISR_LOC)
{
  Disp_Flag = 1; 
}

int main(void) .....

         if (Disp_Flag == 1)
        {
            // Doing nothing for testing!
           
            phi_disp = (phi_LUT_int * (uint64)360000) >> 16; // für P = 2
                   
            sprintf(displayStr,"%4d %4d ",(int)voltCount_sin,(int)voltCount_cos);
            LCD_Position(0,0);
            LCD_PrintString(displayStr);
            result = sprintf(displayStr,"%6d mGrad",(int)phi_disp);
            LCD_Position(1,0);
            LCD_PrintString(displayStr);
            Disp_Flag = 0;
        }

There is also a Jitter in the signal processing, depending on the input signal values and the adjustment of code optimization. But with constant input values (ignoring the ADC-Data) this jitter is not existing.

Could you give me some hints for solving this problem? 

with regards

steve_c