Frequency Read (Multiple Pins)

[Anonymous]

Hello,

   

I have a PSoC 4100 and I'm trying to read in the frequency from 9 pins. I'm limited to using 1 counter and no digital mux. Is there another method around this? Usually I would write a software mux but in this case I can't seem to assign one pin to another.  I have attached the TopDesign to this post.

       

Thank you.

[Anonymous]

So I made my SysClock to 24 MHz and can read values from .1 hz and higher. But, If i set my Waveform Generator to 913 Hz, I still read 917 even when the counters clock is 480 KHz. It seems that the higher i go the less accurate it gets.

   

The method you provided for reading inputs is for 1 pin at a time. Is there a way for implementing all pins at the same time?

   

Rick

[Bob_Marlowe]

No chance at all to have all 9 pins measured at the same time.

   

Accuracy of the clock is 5%. so your measurement lies well within.

       

Bob

[Anonymous]

There is this scenario when there is no signal to the first pin the remaining pins are not measured. In the MeasurePulse function the first while loop waits for the signal to go LOW.  My inputs are initialized to Pull Up resistor High Drive any may be the cause for no change of state. Do you agree?

   

Rick

[Bob_Marlowe]

Set it to "High impedance digital"

       

Bob

[Anonymous]

I have this funky circuit where I need the input to be Resistive pull up with High drive state.

   

I've tried implementing a timer during the first while loop in case the signal is longer than 10 seconds. That only works if the other inputs are > 5 Hz. If the rest of the inputs are reading less than 5 Hz than that condition doesn't work and gets stuck...

   

Rick

[Bob_Marlowe]

Resistive pull up with High drive state Sounds weird, really.

   

Please post a link to datasheet of your "funky circuit"

       

Bob

[Anonymous]

Bob, I was able to get it to work properly with the High Impedance Digital with High Drive state. But, the problem persists when there are zero herts at other pins. In other words, if the pin has no signal the Measure Pulse gets stuck in the for loop waiting for a signal to go low.

   

Rick

[Bob_Marlowe]

Use the interrupt on tc of the counter to set a flag.

       

Bob

[Anonymous]

This is my current project wihtout interrupts. How to implement interrupt without the if statements?

   

Rick

[Bob_Marlowe]

Sorry, but I do not understand the project with the two timers. And you still run on a frequency that cannot be derived from system clock.

       

Bob

[Anonymous]

So I've implemented the Frequency part. Now I need to implement an I2C interrupt. I have the I2C protocol setup in Main but would rather have it in an interrupt that way it only fires upon query. How do you go about making an I2C interrupt since ive never used an interrupt in PSoC before?? I understand the concept of interrupts but dont know how to implement one in PSoC.

   

Rick

[Anonymous]

I was able to implement an I2C interrupt like so:

   

void I2C_IRQHandler(){
    uint32 u32Status;
    
    //I2C_Slave_MV_GetSlaveInterruptSource() & I2C_Slave_MV_INTR_SLAVE_I2C_GENERAL;
    
    if(0u != (I2C_Slave_MV_GetRxInterruptSourceMasked() & I2C_Slave_MV_INTR_RX_PARITY_ERROR))

   

    I2C_Slave_MV_ClearRxInterruptSource(I2C_Slave_MV_INTR_RX_PARITY_ERROR);
    u32Status = I2C_Slave_MV_I2CSlaveStatus();
        
    
    if(s_I2CHandlerFn != NULL)
       s_I2CHandlerFn(u32Status);    
}

   

In main I call this guy:

   

I2C_Slave_MV_SetCustomInterruptHandler(&I2C_IRQHandler);

   

I'm able to get the most recent data with the I2C through this implementation.

   

Rick

[Bob_Marlowe]

See attached

       

Bob