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/**************************************************************************//** * @file main.c * @version V3.00 * $Revision: 3 $ * $Date: 15/09/02 10:03a $ * @brief Demonstrate how to set GPIO pin mode and use pin data input/output control. * @note * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved. * ******************************************************************************/#include"stdio.h"#include"M451Series.h"#include"NuEdu-Basic01.h"#definePLL_CLOCK 72000000voidSYS_Init(void) {/*---------------------------------------------------------------------------------------------------------*//*Init System Clock*//*---------------------------------------------------------------------------------------------------------*//*Enable HIRC clock (Internal RC 22.1184MHz)*/CLK_EnableXtalRC(CLK_PWRCTL_HIRCEN_Msk);/*Wait for HIRC clock ready*/CLK_WaitClockReady(CLK_STATUS_HIRCSTB_Msk);/*Select HCLK clock source as HIRC and and HCLK clock divider as 1*/CLK_SetHCLK(CLK_CLKSEL0_HCLKSEL_HIRC, CLK_CLKDIV0_HCLK(1));/*Enable HXT clock (external XTAL 12MHz)*/CLK_EnableXtalRC(CLK_PWRCTL_HXTEN_Msk);/*Wait for HXT clock ready*/CLK_WaitClockReady(CLK_STATUS_HXTSTB_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 as HXT and UART module clock divider as 1*/CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));/*---------------------------------------------------------------------------------------------------------*//*Init I/O Multi-function*//*---------------------------------------------------------------------------------------------------------*//*Set PD multi-function pins for UART0 RXD(PD.6) and TXD(PD.1)*/SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD6MFP_Msk |SYS_GPD_MFPL_PD1MFP_Msk); SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD6MFP_UART0_RXD |SYS_GPD_MFPL_PD1MFP_UART0_TXD); }voidUART0_Init() {/*---------------------------------------------------------------------------------------------------------*//*Init UART*//*---------------------------------------------------------------------------------------------------------*//*Reset UART module*/SYS_ResetModule(UART0_RST);/*Configure UART0 and set UART0 baud rate*/UART_Open(UART0,115200); }/*---------------------------------------------------------------------------------------------------------*//*Main Function*//*---------------------------------------------------------------------------------------------------------*/int32_t 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("Key1 ~ Key4 detection:\n"); Open_Seven_Segment(); Initial_Key_Input();while(1) {if(Get_Key_Input()&0XFF) {if(Get_Key_Input()&0x01) { Show_Seven_Segment(0,1); }if(Get_Key_Input()&0x02) { Show_Seven_Segment(2,1); }if(Get_Key_Input()&0x04) { Show_Seven_Segment(4,1); }if(Get_Key_Input()&0x08) { Show_Seven_Segment(8,1); } }//Show_Seven_Segment(Get_Key_Input(), 1);} }
这是我设计的一个小程序基于M451的库函数，可以下载到板子上试一试，努力去学习思考，反复验证，
当SW1按上时，B1出电压为零。
我在把库函数贴出来
#include#include"M451Series.h"#include"NuEdu-Basic01_Button.h"#defineKEY1 PE2#defineKEY2 PA8#defineKEY3 PB6#defineKEY4 PB7voidInitial_Key_Input(void) { GPIO_SetMode(PE, BIT2, GPIO_MODE_INPUT);//设为输入 GPIO_SetMode(PA, BIT8, GPIO_MODE_INPUT); GPIO_SetMode(PB, BIT6, GPIO_MODE_INPUT); GPIO_SetMode(PB, BIT7, GPIO_MODE_INPUT); } unsignedcharGet_Key_Input(void) { unsignedchartemp =0;if(KEY1 ==0) temp|=0x1;if(KEY2 ==0) temp|=0x2;if(KEY3 ==0) temp|=0x4;if(KEY4 ==0) temp|=0x8;returntemp; }
/**************************************************************************//** * @file NuEdu-Basic01_7_Segment.c * @version V3.00 * $Revision: 4 $ * $Date: 15/09/02 10:02a $ * @brief M451 series NuEdu Basic01 7-Segment driver source file * * @note * Copyright (C) 2014~2015 Nuvoton Technology Corp. All rights reserved. *****************************************************************************/#include#include"M451Series.h"#include"NuEdu-Basic01_7_Segment.h"#ifdef __cplusplusextern"C"{#endif/** @addtogroup M451_Device_Driver M451 Device Driver @{*//** @addtogroup NuEdu-Basic01_7_Segment Driver @{*//** @addtogroup NuEdu-Basic01_7_Segment Exported Functions @{*//** * @brief Configure the 7-Segment module * * @param[in] None * * @return None * * @details Configure GPIOs of 7-Segment as output mode and turn off all 7-Segement..*/voidOpen_Seven_Segment(void) { GPIO_SetMode(PB, BIT11, GPIO_MODE_OUTPUT);//设为输出 GPIO_SetMode(PB, BIT12, GPIO_MODE_OUTPUT); GPIO_SetMode(PB, BIT13, GPIO_MODE_OUTPUT); GPIO_SetMode(PB, BIT14, GPIO_MODE_OUTPUT); GPIO_SetMode(PB, BIT15, GPIO_MODE_OUTPUT); GPIO_SetMode(PB, BIT5, GPIO_MODE_OUTPUT); GPIO_SetMode(PD, BIT11, GPIO_MODE_OUTPUT); GPIO_SetMode(PF, BIT2, GPIO_MODE_OUTPUT); GPIO_SetMode(PD, BIT8, GPIO_MODE_OUTPUT); GPIO_SetMode(PC, BIT8, GPIO_MODE_OUTPUT); SEG_A_OFF; SEG_B_OFF; SEG_C_OFF; SEG_D_OFF; SEG_E_OFF; SEG_F_OFF; SEG_G_OFF; SEG_H_OFF; }/** * @brief Show number at 7-Segment module * * @param[in] no The number that will be showed at the specified 7-Segment module. * @param[in] number The group number of the specified 7-Segment module. * * @return None * * @details Configure GPIOs of 7-Segment to show number at 7-Segment module*/voidShow_Seven_Segment(unsignedcharno, unsignedcharnumber) { SEG_A_OFF; SEG_B_OFF; SEG_C_OFF; SEG_D_OFF; SEG_E_OFF; SEG_F_OFF; SEG_G_OFF; SEG_H_OFF; SEG_CONTROL1_OFF; SEG_CONTROL2_OFF;switch(no) {//show 0case0: SEG_A_ON; SEG_B_ON; SEG_C_ON; SEG_D_ON; SEG_E_ON; SEG_F_ON;break;//show 1case1: SEG_B_ON; SEG_C_ON;break;//show 2case2: SEG_A_ON; SEG_B_ON; SEG_G_ON; SEG_E_ON; SEG_D_ON;break;//show 3case3: SEG_A_ON; SEG_B_ON; SEG_G_ON; SEG_C_ON; SEG_D_ON;break;//show 4case4: SEG_F_ON; SEG_B_ON; SEG_G_ON; SEG_C_ON;break;//show 5case5: SEG_A_ON; SEG_F_ON; SEG_G_ON; SEG_C_ON; SEG_D_ON;break;//show 6case6: SEG_A_ON; SEG_F_ON; SEG_E_ON; SEG_G_ON; SEG_C_ON; SEG_D_ON;break;//show 7case7: SEG_A_ON; SEG_B_ON; SEG_C_ON; SEG_F_ON;break;//show 8case8: SEG_A_ON; SEG_B_ON; SEG_C_ON; SEG_D_ON; SEG_E_ON; SEG_F_ON; SEG_G_ON;break;//show 9case9: SEG_A_ON; SEG_B_ON; SEG_C_ON; SEG_F_ON; SEG_G_ON;break; }switch(number) {case1: SEG_CONTROL1_ON;break;//show 1case2: SEG_CONTROL2_ON;break; } }/*@}*//*end of group NuEdu-Basic01_7_Segment_EXPORTED_FUNCTIONS*//*@}*//*end of group NuEdu-Basic01_7_Segment_Driver*//*@}*//*end of group M451_Device_Driver*/#ifdef __cplusplus }#endif/*** (C) COPYRIGHT 2014~2015 Nuvoton Technology Corp. ***/
多看看库函数，对你的编程有很大的提高
/*---------------------------------------------------------------------------------------------------------*//*7-Segment GPIO constant definitions*//*---------------------------------------------------------------------------------------------------------*/#defineSEG_A_ON PB11=0 /*!< 7_Segment setting for turning on 7-Segment A. */#defineSEG_B_ON PB12=0 /*!< 7_Segment setting for turning on 7-Segment B. */#defineSEG_C_ON PB13=0 /*!< 7_Segment setting for turning on 7-Segment C. */#defineSEG_D_ON PB14=0 /*!< 7_Segment setting for turning on 7-Segment D. */#defineSEG_E_ON PB15=0 /*!< 7_Segment setting for turning on 7-Segment E. */#defineSEG_F_ON PB5=0 /*!< 7_Segment setting for turning on 7-Segment F. */#defineSEG_G_ON PD11=0 /*!< 7_Segment setting for turning on 7-Segment G. */#defineSEG_H_ON PF2=0 /*!< 7_Segment setting for turning on 7-Segment H. */#defineSEG_CONTROL1_ON PD8=1 /*!< 7_Segment setting for turning on 7-Segment C1. */#defineSEG_CONTROL2_ON PC8=1 /*!< 7_Segment setting for turning on 7-Segment C2. */#defineSEG_A_OFF PB11=1 /*!< 7_Segment setting for turning off 7-Segment A. */#defineSEG_B_OFF PB12=1 /*!< 7_Segment setting for turning off 7-Segment B. */#defineSEG_C_OFF PB13=1 /*!< 7_Segment setting for turning off 7-Segment C. */#defineSEG_D_OFF PB14=1 /*!< 7_Segment setting for turning off 7-Segment D. */#defineSEG_E_OFF PB15=1 /*!< 7_Segment setting for turning off 7-Segment E. */#defineSEG_F_OFF PB5=1 /*!< 7_Segment setting for turning off 7-Segment F. */#defineSEG_G_OFF PD11=1 /*!< 7_Segment setting for turning off 7-Segment G. */#defineSEG_H_OFF PF2=1 /*!< 7_Segment setting for turning off 7-Segment H. */#defineSEG_CONTROL1_OFF PD8=0 /*!< 7_Segment setting for turning off 7-Segment C1. */#defineSEG_CONTROL2_OFF PC8=0 /*!< 7_Segment setting for turning off 7-Segment C2. */
按键设为输入，断码管设为输出。
轻触开关的功能分为两种：一个是常开型、一种是常闭型。最为常见的是常开型，常开型是指线路一般为断开，轻按按键柄触动弹片和底座的炮点接触，这时开关视为导通，放开按键柄弹片和炮点分开，这时开关视为分开，产品的性能为OK。线路断开时两路的阻值为30m欧，当开关导通时两路的接触电阻0，这时开关性能就是非常好的。常闭型是比较少见的，因为这样比较不符合常规的产品设计，常闭型是指正常情况下开关是导通的，当触动开关的时候，线路和功能都是为断开的。这种开关的阻值就是和常开的相反，所以一般不推荐使用。下图都是常开轻触开关：
不论是常开型还是常闭轻触开关必须由两个引脚以上组成，这样才能形成一组开关功能，正常为两脚、四脚、五脚。为什么会有五脚开关的呢？因第五只脚是用来接地的，接地脚是用来干嘛的我想大家都知道。当然还有三个脚的，一般三脚都是侧压的比较多，这个第三只脚就是为了固定设计的，所以大家可以放心使用，使劲的去按压都是没有问题的。下图中两脚线路我们一款就一目了然了，我来解释一下轻触开关的四个引脚是怎么接的吧！正常情况下1和2为一组导通，3和4为一组导通，当触动开关的时候的1和3为一组，2和4为一组，按照这样的方式来设计开关的功能就是对的了。
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