PSoC™ 5, 3 & 1 Forum Discussions

I'm using the PSoC 5LP to overlay pixels on a 8-bit parallel (BT.656) video stream. I need to synchronize my DMA with the vertical sync signal embedded in the video stream.  I'm using one DMA channel with four TD's.  What is the proper way to reset the entire chain?  Currently, I have the vertical sync signal generating an interrupt.  Here is the ISR:

CY_ISR(SYNC_ISR)

{

     CyDmaChSetRequest(DMA1_Chan, CY_DMA_CPU_TERM_CHAIN);   // Terminate the entire chain of TD's

     while(CyDmaChGetRequest(DMA1_Chan));                                               // Wait for the request to be processed.

     CyDmaChEnable(DMA1_Chan, 1);                                                              // Re-enable the DMA channel.

}

I've been trying to get into contact with a Cypress engineer, but 2 hours on the phone system got me nowhere, so I'm posting this here.

I've been fooling around with a system that utilizes three CY8C29466-12PVXET PSoC1's running at 5v.  I didn't handle the programming for that system, so I don't know exactly how the chip's resources are being utilized, but I ran the system with a 3.3v supply for unrelated reasons and noticed that they were still functioning perfectly.

I'm guessing that the M8C core runs on 3.3v internally anyways, and that that particular design did not make much use of any of the configurable blocks, which probably require the 5v supply.

Is there any validity to running these 29466's at 3.3v?  I'd also like to know (if this is even possible) what effect lower voltages would have on their operation up near their max operating temperature at 125C.

Hi

I am using the PSOC kit with the CY8C3866 (ES2 silicon)

I have to use the DAC, but the output signal is strange (see attachment). When I set the DAC to a new value, it does not settle like it should in less than 5us

The DAC output is directly into a 1M scope input, DC coupled.

The code, somewhat snipped: (also attached)

// Enable DACs

VDAC8_1_Start();

while (1) {

VDAC8_1_SetValue(100);

for (i=1;i<100;i++) {

value1 = 100;

}

VDAC8_1_SetValue(0);

for (i=1;i<100;i++) {

value1 = 100;

}

}

Hi,

I need to write a ECG signal on sd card but i can't because i can't get all samples with ADC.

This is code:

    for (i = 0; i < 2000; i++)
    {      
            
       if(ADC_DelSig_1_IsEndConversion(ADC_DelSig_1_WAIT_FOR_RESULT))
        { 
            output = ADC_DelSig_1_GetResult32();
            tensao_auxR = ADC_DelSig_1_CountsTo_mVolts(output);
        a=a+1;
        sprintf(buffer,"%4.2d\t %6.2f \n", a,tensao_auxR);
        FS_Write(pFile,buffer,sizeof(buffer));
        //CyDelay(0.1);
       
        }
        
    }

I can't find the error.

Can help me ?

Regards.

Hello,

  I have a problem with writing on a microSD connected directly to a PSoC 3 (CY8C3246PVI-147). It is set to work at 4MHz, and everything is OK when the PSoC is powered at 5V. However, when I power the PSoC at 3.3V, the microSD operations take a lot more time (tens of sceconds), and nothing is written on the memory card.

  Is there a problem with the PSoC outputs, not being able to command the microSD at 3.3 V power supply? If so, is a buffer chip required between the PSoC and the microSD?

  Thank you!

George