ddllxxrr笔记六中断之我见

2万 · 2011-9-19 11:13

在坛子里看到大家对回调函数的讨论，总觉得十分难。今天把中断这个测试做了，认为完全没有必要去讨论回调函数。

首先看下什么是回调函数：

如果参数是一个函数指针，调用者可以传递一个函数的地址给实现者，让实现者去调用它，这称为回调函数（Callback Function）

这就行了，我想新唐公司用这个函数就是为了不修改.S文件。象流明的每到一个中断必须修改。否则程序不好用。

下面这个程序是按键KEY2中断，我把中断函数换成任何名字，当然中断使能名字也得换，换成什么名字都好用，不信大家试试。

看了下

管脚中断使能的说明，也确实如此，大家不要要。。。。CALLBACK.吓到了，抓紧时间学习吧。

/*----------------------------------------------------------------------*/
/* Function: DrvGPIO_EnableEINT0                                              */
/*                                                                                              */
/* Parameter:                                                                               */
/*          TriggerType - [in]                                                          */
/*                E_DRVGPIO_INT_TYPE, specify the interrupt trigger type.                         */
/*                It could be E_IO_RISING, E_IO_FALLING or E_IO_BOTH_EDGE and             */
/*                it's meaning the interrupt function enable by rising egde/high level,             */
/*                falling edge/low level or both riging edge and falling egde.                            */
/*                If the interrupt mode is E_MODE_LEVEL and interrupt type is                      */
/*                E_BOTH_EDGEthen calling this API is ignored.                                        */
/*          Mode - [in]                                                                                              */
/*                E_DRVGPIO_INT_MODE, specify the interrupt mode.                               */
/*                It could be E_MODE_EDGE or E_MODE_LEVEL to control the interrupt is by       */
/*                edge trigger or by level trigger.                                                                      */
/*                If the interrupt mode is E_MODE_LEVEL and interrupt type is                            */
/*                E_BOTH_EDGEthen calling this API is ignored.                                              */
/*          pfEINT0Callback - [in]                                                                                           */
/*                It's the function pointer of the external INT0 callback function.                            */
/* Returns:                                                                                                                         */
/*             None                                                                                                                   */
/* Description:                                                                                                                      */
/*             Enable the interrupt function for external GPIO interrupt from /INT0(GPB.14) pin.       */
/*---------------------------------------------------------------------------------------------------*/

上我的中断调试程序，那个INT0可以换成任何名字，如：ddllxxrr

/*---------------------------------------------------------------------------------------------------------*/
/*                                                                                                       */
/* Copyright(c) 2009 Nuvoton Technology Corp. All rights reserved.                                        */
/*                                                                                                       */
/*---------------------------------------------------------------------------------------------------------*/
#include <stdio.h>
#include "NUC1xx.h"
#include "DrvGPIO.h"
#include "DrvUART.h"
#include "DrvSYS.h"
void INT0(void)
{
printf("Interrupt\n");
}
void Delay(uint32_t counter)
{
while (counter--);
}

/*---------------------------------------------------------------------------------------------------------*/
/* MAIN function                                                                                        */
/*---------------------------------------------------------------------------------------------------------*/
int main(void)
{
STR_UART_T sParam;
/* SYSCLK =>12Mhz*/
UNLOCKREG();
/* Enable 12M Crystal */
DrvSYS_SetOscCtrl(E_SYS_XTL12M, 1);
/* Switch to PLL clock */
DrvSYS_SelectHCLKSource(0);
LOCKREG();
/* Set UART0 Pin */
DrvGPIO_InitFunction(E_FUNC_UART0);
/* UART Setting */
sParam.u32BaudRate = 9600;
sParam.u8cDataBits = DRVUART_DATABITS_8;
sParam.u8cStopBits = DRVUART_STOPBITS_1;
sParam.u8cParity = DRVUART_PARITY_NONE;
sParam.u8cRxTriggerLevel = DRVUART_FIFO_1BYTES;
/* Select UART Clock Source From 12Mhz*/
DrvSYS_SelectIPClockSource(E_SYS_UART_CLKSRC, 0);
/* Set UART0 Configuration */
DrvUART_Open(UART_PORT0, &sParam);
/*---------------------------------------------------------------------------------------------------------*/
/* GPIO Interrupt Test                                                                                  */
/*---------------------------------------------------------------------------------------------------------*/
/* Configure general GPIO interrupt */
DrvGPIO_Open(E_GPB, 14, E_IO_INPUT);
/* Configure external interrupt */
DrvGPIO_EnableEINT0(E_IO_BOTH_EDGE, E_MODE_EDGE, INT0);
/* Waiting for interrupts */
while (1)
{
      printf("Deep Sleep\n");
      while (UART0->FSR.TE_FLAG == 0);
      GPIOA->DOUT |= 0x7000;
      UNLOCKREG();
      SCB->SCR = 4;
      SYSCLK->PWRCON.PD_WU_INT_EN = 0;
      SYSCLK->PWRCON.PD_WAIT_CPU  = 1;
      SYSCLK->PWRCON.PWR_DOWN  = 1;
      LOCKREG();
      __WFI();
}
}

效果图：