Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

PSoC™ 5, 3 & 1 Forum Discussions

JeJa_2249041
Level 1
Level 1
First question asked Welcome!

I'm using the CY8C20524-12PVXI with the intention of controlling a display with a rotary encoder. It seems that when I run the application, the Interrupt Service Routine runs once, without touching a button. When I press the button, the ISR runs, but nothing happens each subsequent time that I press the button. The while loop in the main function still executes instructions, so I know that the ISR maintains context and returns to the correct address.

It seems like I need to clear the interrupt in order to interrupt again, but I haven't been able to successfully do so yet.

 

My GPIO setup is portrayed in the following code:

 

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

#pragma interrupt_handler GPIO_ISR

...

void main(void)

{

    IO_CFG |= 0x01; // set the IO_CFG_IOINT bit
    IO_CFG |= 0x02; // set REG_EN to 1

    // set pin as Open Drain Low, High Z
    ROT_SW_DriveMode_0_ADDR |= ROT_SW_MASK;
    ROT_SW_DriveMode_1_ADDR |= ROT_SW_MASK;
    ROT_SW_Data_ADDR |= ROT_SW_MASK;

    M8C_EnableIntMask(INT_MSK0, INT_MSK0_GPIO); //Enable the GPIO in INT_MSK0:
    ROT_SW_IntEn_ADDR |= ROT_SW_MASK; // Enableinterrupts on Rotary Switch
    M8C_EnableGInt; //Enables the Global Interrupt

    ...

    while (1)
    {
        ...
        if ( rotarySwitchPressed != button_idle ){
            rotarySwitchPressed = button_idle;
            ...
            ROT_SW_Data_ADDR |= ROT_SW_MASK;
            M8C_EnableIntMask(INT_MSK0, INT_MSK0_GPIO);
        }
        ...
    }

}

...

void GPIO_ISR(void)
{

    // disable button interrupt
    M8C_DisableIntMask(INT_MSK0, INT_MSK0_GPIO);
    rotarySwitchPressed = button_pressed;
    return;
}

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

Is there a register I need to write to in order to enable a GPIO to trigger the ISR more than one time?

Thanks!

0 Likes
1 Solution
SampathS_11
Moderator
Moderator
Moderator
250 sign-ins 250 solutions authored 5 questions asked

Hello @JeJa_2249041 ,

You would need to clear the GPIO interrupt in the ISR, by using

M8C_ClearIntFlag(INT_MSK0, INT_MSK0_GPIO)

You can find detailed information in PSoC®1 Interrupts, and  PSoC®1 - Getting Started With GPIO.

Best regards,

Sampath Selvaraj

View solution in original post

0 Likes
1 Reply
SampathS_11
Moderator
Moderator
Moderator
250 sign-ins 250 solutions authored 5 questions asked

Hello @JeJa_2249041 ,

You would need to clear the GPIO interrupt in the ISR, by using

M8C_ClearIntFlag(INT_MSK0, INT_MSK0_GPIO)

You can find detailed information in PSoC®1 Interrupts, and  PSoC®1 - Getting Started With GPIO.

Best regards,

Sampath Selvaraj

0 Likes