- /**************************************************************************//**
- * @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. ***/
|