K60 GPIO external interrupt-EEWORLD

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K60 can use almost any GPIO as an external interrupt

To use external interrupts, you need to configure the registers and write the interrupt function.

Here I use pin 19 of port A as the key external interrupt detection, and pin 10 of port A as the LED output

void init_gpio()

{

gpio_init_struct.GPIO_PTx = PTA; //PORTA

gpio_init_struct.GPIO_Pins = GPIO_Pin19; //Pins 6, 7

gpio_init_struct.GPIO_Dir = DIR_INPUT; //Input

gpio_init_struct.GPIO_PinControl = INPUT_PULL_UP|IRQC_FA; //Internal pull-up|rising edge interrupt

gpio_init_struct.GPIO_Isr = porta_isr; //interrupt function

LPLD_GPIO_Init(gpio_init_struct);

// Enable interrupt

LPLD_GPIO_EnableIrq(gpio_init_struct);

gpio_init_struct.GPIO_PTx=PTA;

gpio_init_struct.GPIO_Pins = GPIO_Pin10;

gpio_init_struct.GPIO_Dir = DIR_OUTPUT;

gpio_init_struct.GPIO_Output = OUTPUT_H;

gpio_init_struct.GPIO_PinControl = IRQC_DIS;

LPLD_GPIO_Init(gpio_init_struct);

}

The fifth line gpio_init_struct.GPIO_Isr = porta_isr; assigns the name of the interrupt function to GPIO_Isr, which is used to store the address pointer of the interrupt function and then enable the interrupt.

Interrupt function

void porta_isr()

{

if(LPLD_GPIO_IsPinxExt(PORTA, GPIO_Pin19))

{

//Debounce

delay();

if(PTA19_I==0)

{

PTA10_O=0;

delay();delay();delay();

PTA10_O=1;

}

The name of this interrupt function is the value given to GPIO_Isr. Each GPIO pin has an interrupt flag, and LPLD_GPIO_IsPinxExt(PORTx, GPIO_Piny) is the interrupt flag of the Piny port of PORTx. Once an interrupt occurs, the flag is 1 and the interrupt function content is executed.

There is also a tip, the interrupt function here needs to be declared, which is different from 51, where the 51 does not need to be declared.

Keywords：K60 GPIO Reference address：K60 GPIO external interrupt

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