这样做。/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V3.00
* $Revision: 3 $
* $Date: 14/01/28 11:44a $
* [url=home.php?mod=space&uid=247401]@brief[/url] 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
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 and TXD */
SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0);
}
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)
{
int32_t i32Err;
/* 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("| P1.2(Output) and P4.1(Input) Sample Code |\n");
printf("+-------------------------------------------------+\n\n");
/* Configure P1.2 as Output mode and P4.1 as Input mode */
GPIO_SetMode(P1, BIT2, GPIO_PMD_OUTPUT);
GPIO_SetMode(P4, BIT1, GPIO_PMD_INPUT);
i32Err = 0;
printf("GPIO P1.2(output mode) connect to P4.1(input mode) ......");
/* Use Pin Data Input/Output Control to pull specified I/O or get I/O pin status */
P12 = 0;
if(P41 != 0)
{
i32Err = 1;
}
P12 = 1;
if(P41 != 1)
{
i32Err = 1;
}
if(i32Err)
{
printf(" [FAIL].\n");
}
else
{
printf(" [OK].\n");
}
/* Configure P1.2 and P4.1 to default Quasi-bidirectional mode */
GPIO_SetMode(P1, BIT2, GPIO_PMD_QUASI);
GPIO_SetMode(P4, BIT1, GPIO_PMD_QUASI);
while(1);
}
/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/
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