不如直接贴代码
- /**************************************************************************//**
- * [url=home.php?mod=space&uid=288409]@file[/url] main.c
- * [url=home.php?mod=space&uid=895143]@version[/url] V2.00
- * $Revision: 2 $
- * $Date: 15/04/10 10:28a $
- * [url=home.php?mod=space&uid=247401]@brief[/url] NUC230_240 Series GPIO Driver Sample Code
- *
- * @note
- * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
- ******************************************************************************/
- #include <stdio.h>
- #include "NUC230_240.h"
- #define PLL_CLOCK 72000000
- void GPAB_IRQHandler(void)
- {
- PA0^=1;
- /* To check if PB.3 interrupt occurred */
- if(GPIO_GET_INT_FLAG(PB, BIT3)) {
- GPIO_CLR_INT_FLAG(PB, BIT3);
- printf("PB.3 INT occurred.\n");
- } else {
- /* Un-expected interrupt. Just clear all PA, PB interrupts */
- PA->ISRC = PA->ISRC;
- PB->ISRC = PB->ISRC;
- printf("Un-expected interrupts.\n");
- }
- }
- void PWRWU_IRQHandler(void)
- {
- PA1^=1;
- printf("PDWU_IRQHandler running...\n");
- CLK->PWRCON |= CLK_PWRCON_PD_WU_STS_Msk; /* clear interrupt */
- }
- 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_HXT, CLK_CLKDIV_UART(1));
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init I/O Multi-function */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Set GPB multi-function pins for UART0 RXD and TXD */
- 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);
- }
- void UART0_Init()
- {
- /*---------------------------------------------------------------------------------------------------------*/
- /* Init UART */
- /*---------------------------------------------------------------------------------------------------------*/
- /* Reset UART0 */
- 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();
- /* Init UART0 for printf */
- UART0_Init();
- /* Configure PB.3 as Input mode and enable interrupt by rising edge trigger */
- GPIO_EnableInt(PB, 3, GPIO_INT_FALLING);
- NVIC_EnableIRQ(GPAB_IRQn);
- CLK->PWRCON |= CLK_PWRCON_PD_WU_INT_EN_Msk; /* Enable wake up interrupt source */
- NVIC_EnableIRQ(PWRWU_IRQn); /* Enable IRQ request for PDWU interrupt */
- NVIC_SetPriority(PWRWU_IRQn,0);
- NVIC_SetPriority(GPAB_IRQn,3);
- /* Waiting for PB.3 rising-edge interrupt event */
- while(1) {
- UART_WAIT_TX_EMPTY(UART0);
- CLK_PowerDown();
- }
- }
- /*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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