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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