/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 10 $
* $Date: 16/06/08 1:28p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how to use GPIO external interrupt function.
* @note
* Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "NUC123.h"
#define HCLK_CLOCK 72000000
/**
* @brief External INT0 IRQ
*
* @param None
*
* [url=home.php?mod=space&uid=266161]@return[/url] None
*
* [url=home.php?mod=space&uid=1543424]@Details[/url] The External INT0(PB.14) default IRQ, declared in startup_NUC123.s.
*/
void EINT0_IRQHandler(void)
{
/* For PB.14, clear the INT flag */
GPIO_CLR_INT_FLAG(PB, BIT14);
printf("EINT0 occurred.\n");
}
/**
* @brief External INT1 IRQ
*
* @param None
*
* @return None
*
* @details The External INT1(PB.15) default IRQ, declared in startup_NUC123.s.
*/
void EINT1_IRQHandler(void)
{
/* For PB.15, clear the INT flag */
GPIO_CLR_INT_FLAG(PB, BIT15);
printf("EINT1 occurred.\n");
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable XT1_OUT(PF0) and XT1_IN(PF1) */
SYS->GPF_MFP &= ~(SYS_GPF_MFP_PF0_Msk | SYS_GPF_MFP_PF1_Msk);
SYS->GPF_MFP |= SYS_GPF_MFP_PF0_XT1_OUT | SYS_GPF_MFP_PF1_XT1_IN;
/* Enable Internal RC 22.1184MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_OSC22M_EN_Msk);
/* Waiting for Internal RC clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_OSC22M_STB_Msk);
/* Switch HCLK clock source to Internal RC and HCLK source divide 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_HIRC, CLK_CLKDIV_HCLK(1));
/* Enable external XTAL 12MHz clock */
CLK_EnableXtalRC(CLK_PWRCON_XTL12M_EN_Msk);
/* Waiting for external XTAL clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL12M_STB_Msk);
/* Set core clock as HCLK_CLOCK */
CLK_SetCoreClock(HCLK_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_HXT, CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set GPB multi-function pins for UART0 RXD(PB.0) and TXD(PB.1) */
SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB0_Msk | SYS_GPB_MFP_PB1_Msk);
SYS->GPB_MFP |= (SYS_GPB_MFP_PB0_UART0_RXD | SYS_GPB_MFP_PB1_UART0_TXD);
/* Set GPB multi-function pins for INT0(PB.14) and INT1(PB.15) */
SYS->GPB_MFP &= ~(SYS_GPB_MFP_PB14_Msk | SYS_GPB_MFP_PB15_Msk);
SYS->ALT_MFP &= ~SYS_ALT_MFP_PB15_Msk;
SYS->GPB_MFP |= (SYS_GPB_MFP_PB14_INT0 | SYS_GPB_MFP_PB15_INT1);
SYS->ALT_MFP |= SYS_ALT_MFP_PB15_INT1;
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART0 module */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, 115200);
}
/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/* Init System, peripheral clock and multi-function I/O */
SYS_Init();
/* Lock protected registers */
SYS_LockReg();
/* Init UART0 for printf */
UART0_Init();
printf("\n\nCPU [url=home.php?mod=space&uid=72445]@[/url] %d Hz\n", SystemCoreClock);
printf("+------------------------------------------------------------+\n");
printf("| GPIO EINT0/EINT1 Interrupt Sample Code |\n");
printf("+------------------------------------------------------------+\n\n");
/*-----------------------------------------------------------------------------------------------------*/
/* GPIO External Interrupt Function Test */
/*-----------------------------------------------------------------------------------------------------*/
printf("EINT0(PB.14) and EINT1(PB.15) are used to test interrupt\n");
/* Configure PB.14 as EINT0 pin and enable interrupt by falling edge trigger */
GPIO_SetMode(PB, BIT14, GPIO_PMD_INPUT);
GPIO_EnableEINT0(PB, 14, GPIO_INT_FALLING);
NVIC_EnableIRQ(EINT0_IRQn);
/* Configure PB.15 as EINT1 pin and enable interrupt by rising and falling edge trigger */
GPIO_SetMode(PB, BIT15, GPIO_PMD_INPUT);
GPIO_EnableEINT1(PB, 15, GPIO_INT_BOTH_EDGE);
NVIC_EnableIRQ(EINT1_IRQn);
/* Waiting for interrupts */
while(1);
}
/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/
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