/**************************************************************************//**
* @file main.c
* @version V3.00
* $Revision: 3 $
* $Date: 14/01/28 11:44a $
* @brief M051 Series GPIO Driver Sample Code
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
******************************************************************************/
#include <stdio.h>
#include "M051Series.h"
#define PLL_CLOCK 50000000
/**
* @brief External INT0 IRQ
*
* @param None
*
* @return None
*
* @details The External INT0(P3.2) default IRQ, declared in startup_M051Series.s.
*/
void EINT0_IRQHandler(void)
{
/* For P3.2, clear the INT flag */
GPIO_CLR_INT_FLAG(P3, BIT2);
printf("P3.2 EINT0 occurred.\n");
}
/**
* @brief External INT1 IRQ
*
* @param None
*
* @return None
*
* @details The External INT1(P3.3) default IRQ, declared in startup_M051Series.s.
*/
void EINT1_IRQHandler(void)
{
/* For P3.3, clear the INT flag */
GPIO_CLR_INT_FLAG(P3, BIT3);
printf("P3.3 EINT1 occurred.\n");
}
void SYS_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* 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 PLL_CLOCK from PLL */
CLK_SetCoreClock(PLL_CLOCK);
/* Enable UART module clock */
CLK_EnableModuleClock(UART0_MODULE);
/* Select UART module clock source */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P3 multi-function pins for UART0 RXD, TXD, EINT0 and EINT1 */
SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk | SYS_MFP_P32_Msk | SYS_MFP_P33_Msk);
SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0 | SYS_MFP_P32_INT0 | SYS_MFP_P33_INT1);
}
void UART0_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset UART */
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 @ %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(P3.2) and EINT1(P3.3) are used to test interrupt \n");
/* Configure P3.2 as EINT0 pin and enable interrupt by falling edge trigger */
GPIO_SetMode(P3, BIT2, GPIO_PMD_INPUT);
GPIO_EnableEINT0(P3, 2, GPIO_INT_FALLING);
NVIC_EnableIRQ(EINT0_IRQn);
/* Configure P3.3 as EINT1 pin and enable interrupt by rising and falling edge trigger */
GPIO_SetMode(P3, BIT3, GPIO_PMD_INPUT);
GPIO_EnableEINT1(P3, 3, GPIO_INT_BOTH_EDGE);
NVIC_EnableIRQ(EINT1_IRQn);
/* Enable interrupt de-bounce function and select de-bounce sampling cycle time is 1024 * 10 KHz clock */
GPIO_SET_DEBOUNCE_TIME(GPIO_DBCLKSRC_LIRC, GPIO_DBCLKSEL_1024);
GPIO_ENABLE_DEBOUNCE(P3, BIT2 | BIT3);
/* Waiting for interrupts */
while(1);
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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