Nuvoton M051 external interrupt 1 usage program-EEWORLD

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Share a program for using the external interrupt 1 of the Nuvoton M051 MCU:

#include "SmartM_M0.h"

#define DEBUGMSG printf

/******************************************

*Function name:KeyIntInit

* Input: None

*Output: None

*Function: key interrupt initialization

******************************************/

VOID KeyIntInit(VOID)

{

P3_PMD=0xFFFF; //quasi-bidirectional mode

P3_DOUT=0xFF; //output high level

P3_MFP = (P3_MFP & (~P33_EINT1_MCLK)) | EINT1; //P3.2 pin is set as external interrupt

DBNCECON &= ~ICLK_ON; //Disable clock?

DBNCECON &= DBCLK_HCLK; // Anti-bounce counter clock source is HCLK

DBNCECON |= SMP_256CK; //Set the anti-rebound sampling cycle selection

P3_DBEN |= DBEN3; //Enable P3.2 anti-rebound function

P3_IMD &= IMD3_EDG;

P3_IEN |= IF_EN3; //Set external interrupt 0 to falling edge trigger

NVIC_ISER |= EXT_INT1;

}

/******************************************

*Function name: main

* Input: None

*Output: None

*Function: Function body

******************************************/

INT32 main(VOID)

{

PROTECT_REG //Protect FLASH memory during ISP download

(

PWRCON |= XTL12M_EN; //The default clock source is external crystal oscillator

while((CLKSTATUS & XTL12M_STB) == 0); //Wait for 12MHz clock to stabilize

CLKSEL0 = (CLKSEL0 & (~HCLK)) | HCLK_12M; //Set the external crystal oscillator as the system clock

)

UartInit(12000000,9600); //Set the baud rate to 9600bps

KeyIntInit(); //Key interrupt initialization

DEBUGMSG("Init ok \b");

while(1);

}

/******************************************

*Function name:__KEYISR

* Input: None

*Output: None

*Function: key interrupt service function

******************************************/

VOID EINT1_IRQHandler（VOID)

{

DEBUGMSG("Key int "); //Print key interrupt information

P3_ISRC = P3_ISRC; //Write 1 to clear

}

Reference address：Nuvoton M051 external interrupt 1 usage program

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