A question about the PSOC5866 UART Rx interrupt

Can you please post your complete project so that we all can have a look at all of your settings. To do so, use

Creator->File->Create Workspace Bundle (minimal)

and attach the resulting file.

Bob

I created a project to reproduce your issue, but I cannot reproduce the issue with my CY8CKIT-059.  Please refer attached example project.

uint8 rxData = 0;


CY_ISR(int_Rx_isr) {
    rxData = UART_RXDATA_REG;
    UART_TXDATA_REG = rxData;
}

In the ISR, the value of RXDATA register is copied into the TXDATA register like your code.

int main(void) {
    CyGlobalIntEnable; /* Enable global interrupts. */


    /* Place your initialization/startup code here (e.g. MyInst_Start()) */
    UART_Start();
    int_Rx_StartEx(int_Rx_isr);    
    UART_PutString("HELLO WORLD\r\n");


    for (;;) {
        /* Place your application code here. */
    }
}

In the main() function, UART and Interrupt components are started and show a greeting message.

When this project is written to the Prototyping kit, the greeting message was displayed and loop-back the entered characters.  ISR is called once a character.

In my project, both FIFO size are set to four.  This means the UART component uses the hardware FIFO only.  Please check the FIFO size you specified.

Regards,

Noriaki

I have converted your project into my CY8CKIT-059 but the issue is not reproduced.

I assigned pins as follows.  Other pins are automatically assigned.

When I typed '1' and '3' alternately, the LED1 on the CY8CKIT-059 turns ON and OFF.

The behavior is same when the CY8CKIT-059 is disconnect and reconnect.

Regards,

Noriaki