/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 7 $
* $Date: 15/09/02 10:04a $
* [url=home.php?mod=space&uid=247401]@brief[/url] Show the usage of GPIO external interrupt function and de-bounce function.
* @note
* Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "M451Series.h"
#define PLLCTL_SETTING CLK_PLLCTL_72MHz_HXT
#define PLL_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 default IRQ, declared in startup_M451Series.s.
*/
void EINT0_IRQHandler(void)
{
/* To check if PA.0 external interrupt occurred */
if(GPIO_GET_INT_FLAG(PA, BIT0))
{
GPIO_CLR_INT_FLAG(PA, BIT0);
printf("PA.0 EINT0 occurred.\n");
}
/* To check if PD.2 external interrupt occurred */
if(GPIO_GET_INT_FLAG(PD, BIT2))
{
GPIO_CLR_INT_FLAG(PD, BIT2);
printf("PD.2 EINT0 occurred.\n");
}
}
/**
* @brief External INT1 IRQ
*
* @param None
*
* @return None
*
* @details The External INT1 default IRQ, declared in startup_M451Series.s.
*/
void EINT1_IRQHandler(void)
{
/* To check if PB.0 external interrupt occurred */
if(GPIO_GET_INT_FLAG(PB, BIT0))
{
GPIO_CLR_INT_FLAG(PB, BIT0);
printf("PB.0 EINT1 occurred.\n");
}
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Enable HIRC clock (Internal RC 22.1184MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);
/* Wait for HIRC clock ready */
CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);
/* Select HCLK clock source as HIRC and and HCLK source divider as 1 */
CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));
/* Enable HXT clock (external XTAL 12MHz) */
CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);
/* Wait for HXT clock ready */
CLK_WaitClockReady(CLK_STATUS_HXTSTB_Msk);
/* Set core clock as PLL_CLOCK from PLL */
CLK_SetCoreClock(PLL_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Select UART module clock source as HXT and UART module clock divider as 1 */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set PD multi-function pins for UART0 RXD(PD.0) and TXD(PD.1) */
SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);
SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);
/* Set PA multi-function pin for EINT0(PA.0) */
SYS->GPA_MFPL = SYS->GPA_MFPL & (~SYS_GPA_MFPL_PA0MFP_Msk) | SYS_GPA_MFPL_PA0MFP_INT0;
/* Set PD multi-function pin for EINT0(PD.2) */
SYS->GPD_MFPL = SYS->GPD_MFPL & (~SYS_GPD_MFPL_PD2MFP_Msk) | SYS_GPD_MFPL_PD2MFP_INT0;
/* Set PB multi-function pin for EINT1(PB.0) */
SYS->GPB_MFPL = SYS->GPB_MFPL & (~SYS_GPB_MFPL_PB0MFP_Msk) | SYS_GPB_MFPL_PB0MFP_INT1;
}
void UART0_Init()
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART module */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 baud rate */
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 and De-bounce Sample Code |\n");
printf("+------------------------------------------------------------+\n\n");
/*-----------------------------------------------------------------------------------------------------*/
/* GPIO External Interrupt Function Test */
/*-----------------------------------------------------------------------------------------------------*/
printf("EINT0(PA.0 and PD.2) and EINT1(PB.0) are used to test interrupt\n");
/* Configure PA.0 as EINT0 pin and enable interrupt by falling edge trigger */
GPIO_SetMode(PA, BIT0, GPIO_MODE_INPUT);
GPIO_EnableInt(PA, 0, GPIO_INT_FALLING);
/* Configure PD.2 as EINT0 pin and enable interrupt by rising edge trigger */
GPIO_SetMode(PD, BIT2, GPIO_MODE_INPUT);
GPIO_EnableInt(PD, 2, GPIO_INT_RISING);
NVIC_EnableIRQ(EINT0_IRQn);
/* Configure PB.0 as EINT1 pin and enable interrupt by falling and rising edge trigger */
GPIO_SetMode(PB, BIT0, GPIO_MODE_INPUT);
GPIO_EnableInt(PB, 0, GPIO_INT_BOTH_EDGE);
NVIC_EnableIRQ(EINT1_IRQn);
/* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 clocks of LIRC clock */
GPIO_SET_DEBOUNCE_TIME(GPIO_DBCTL_DBCLKSRC_LIRC, GPIO_DBCTL_DBCLKSEL_1024);
GPIO_ENABLE_DEBOUNCE(PA, BIT0);
GPIO_ENABLE_DEBOUNCE(PB, BIT0);
GPIO_ENABLE_DEBOUNCE(PD, BIT2);
/* Waiting for interrupts */
while(1);
}
/*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/
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