PSCO4 stdUART MCU <--> PIC MCU not working, (Solved)

[Anonymous]

Please help me!

I've tried to do this on my own and spent >10 hours trying to get this idea to work, searched for sample software, read the SCB specsheet, searched the net!

I have a CY8KIT-042  eval board(mcu CY8C4245) to use to receive/send binary array of bytes to a PIC MCU, both directly connected Tx<-->RX.  configured 115200, 8,n,1   on both mcu's.

The cmd/data sent/received is always a fixed-size array of binary bytes .

The PIC is always the master.

PIC initiates a chat by sending 41 bytes binary.  (contained in an array: unsigned char Tx[41] ) to be received and placed into a unsigned char Rx[41] array on the CY8Kit.

The Cypress then sets a flag that a new byte/data pac of 41 bytes has been received and processes the received 41-byte buffer of cmds and data.

.

The Cy then should Tx back to the Cy8Kit the updated data in its  unsigned char Tx[41]

I have the PIC Xmit functioning perfectly Tx'ing the 40-byte array once a second (always same 40 test bytes). I have verified this on my scope.

I can't seem to get any received data into the CY8KIT. I haven't yet begun to write the code sending data back to the PIC.

Here is my HW info and code on the PSOC side of this game:

I configured the std UART SCB:      baud 115200,N,8,1

            HW:                                          for  Tx and Rx

                                                        Tx output pin P0[5] Tx  ----->PIC Rx

                                                         Rx input pin  P0[4] Rx ------>PIC Tx     (using 3-in flying wires for both connections including connecting both Vss(Gnd) and VDD(5V)<

                                                         Rx input pin on Cy has 18k pullup to +5

Config of SCB UART                         UART    (alias UA)

                                                         Rx and TX

                                                         FIFO size:  41

                                                         12 x oversampling Rx

                                                          System Clock 24Mhz

                                                          Only one active Interrupt checked:   RX FIFO UNDERFLOW

My Cypress Code:

//before main()

unsigned char Tx[41],Rx[41],rbyt=0;

CY_ISR_PROTO (ISR_UART);

void ISR_UART()

{

    /* Returns the status/identity of which enabled RX interrupt source caused interrupt event */

    uint32 source = UA_GetRxInterruptSource();

    /* Checks for "RX FIFO AND not empty" interrupt */

    if(0ul != (UA_INTR_RX_NOT_EMPTY & source))

     {

        /* Get the character from terminal */

        Rx[rbyt] = UA_UartGetByte();

        rbyt++;   //Counts the number of bytes received

        if(rbyt>41)rbyt=0;

        /* Clear UART "RX FIFO not empty interrupt" */

        UA_ClearRxInterruptSource(UA_INTR_RX_NOT_EMPTY);

        UA_ClearPendingInt();

     }

   else

   ClearPendingInt();

}

int main(void)

{

CyGlobalIntEnable; /* Enable global interrupts. */

CySysWdtDisable(0);// Disable, WDT to do nothing on WDT timeout

rbyt=0;

UA_Start();

UA_EnableInt();

UA_SetCustomInterruptHandler(ISR_UART);

start:   //---------------------------------------------------------------

// code continues here displays the value of rbyt on the Cy  and is now always showing 0  (a multiple digit 7-Seg display.. works 100%)

  goto start;

}

[MotooTanaka · Accepted solution]

Hi,

Since I don't have a PIC board, I used PC(and TeraTerm) to emulate a PIC.

I copied your source and added a debug command to print out the value(s) when rbyt hits 41.

I hope that I have not touched any other part(s).

And seeing the result (TeraTerm Log), your program seems to be working.

Then I would suggest you to check the hardware connection between

CY8CKIT-042 and your PIC.

=============================

#include "project.h"

#include <stdio.h>

char str[128] ; /* print buff */

//before main()

unsigned char Tx[41],Rx[41],rbyt=0;

CY_ISR_PROTO (ISR_UART);

void ISR_UART()

{

    /* Returns the status/identity of which enabled RX interrupt source caused interrupt event */

    uint32 source = UA_GetRxInterruptSource();

    /* Checks for "RX FIFO AND not empty" interrupt */

    if(0ul != (UA_INTR_RX_NOT_EMPTY & source))

    {

        /* Get the character from terminal */

        Rx[rbyt] = UA_UartGetByte();

        rbyt++;  //Counts the number of bytes received

        if(rbyt>41)rbyt=0;

        /* Clear UART "RX FIFO not empty interrupt" */

        UA_ClearRxInterruptSource(UA_INTR_RX_NOT_EMPTY);

        UA_ClearPendingInt();

    }

  else

      UA_ClearPendingInt() ; // was ClearPendingInt();

}

int main(void)

{

    CyGlobalIntEnable; /* Enable global interrupts. */

    CySysWdtDisable(0);// Disable, WDT to do nothing on WDT timeout

    rbyt=0;

    UA_Start();

    UA_EnableInt();

    UA_SetCustomInterruptHandler(ISR_UART);

start:  //---------------------------------------------------------------

// code continues here displays the value of rbyt on the Cy

// and is now always showing 0  (a multiple digit 7-Seg display.. works 100%)

    if (rbyt == 41) {

        int i ;

        UA_UartPutString("\n") ;

        for (i = 0 ; i < rbyt ; i++) {

            sprintf(str, "%02X ", Rx) ;

            UA_UartPutString(str) ;

        }

        UA_UartPutString("\n") ;

        rbyt = 0 ;

    }

  goto start;

}

=============================

TeraTerm Log

I set local echo on, so my typing is shown as letters,

but when 41st letter hits, the debug command prints out them in Hex format.

moto

[Anonymous]

Thanks a Gigabyte!

I just again checked by Tx--Rx and (ooops!) I had mistakenly soldered the right wire in the left place. 

The whole problem boiled down to HW.  Tx-->Tx   Rx-->Rx