LPC812 GPIO input

hibino123 — Thu, 30 Jun 2022 08:31:42 GMT

Hi All,

I am new to using LPC812.

I am thinking of a program that blinks an LED when a button is pressed.

LEDs are connected to PIO0_0 and buttons are connected to PIO0_14.

This is the program I came up with.

int main(void) {
　SystemCoreClockUpdate();
　SysTick_Config( SYSTICK_DELAY );
　GPIOInit();
　LPC_SYSCON->SYSAHBCLKCTRL |= (1<<6);
　LPC_GPIO_PORT->DIR0 |= (1<<0);
　LPC_GPIO_PORT->DIR0 &=~ (1<<14);
　volatile int8_t SW1 = 1;
　while(1) {
　　SW1 = (LPC_GPIO_PORT->PIN0 & (1<<14));
　　if(SW1 == 0){
　　　LPC_GPIO_PORT->SET0 |= (1<<0);
　　　delaySysTick(100);
　　　LPC_GPIO_PORT->CLR0 |= (1<<0);
　　　delaySysTick(100);
　　}
　　else{
　　　LPC_GPIO_PORT->CLR0 |= (1<<0);
　　}
　}
　return 0 ;
}

However, this program did not work.

I think the pin is not set up correctly, but I would like to know.

Re: LPC812 GPIO input

Alice_Yang — Fri, 01 Jul 2022 03:31:54 GMT

Hello ,

Recommend you refer to the gpio demo under LPC824 SDK.

Also set breakpoint to while function, check whether it can enter while when press button.

Alice

Re: LPC812 GPIO input

Badman — Sat, 02 Jul 2022 10:50:48 GMT

I don't know lpc812. Maybe PIO0_14 has a different function than gpio by default. Check in User Manual PIO0_14.

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