嵌入式基础考试题目(共22页)

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1、精选优质文档-倾情为你奉上1、 用PWM方式，使LED灯闪烁。专心-专注-专业#include config.hvoid PwmInit(void);int main(void)PINSEL0=0x;PwmInit();while(1)PWMMR0=4000;PWMMR6=2000;return 0;void PwmInit()PWMPR=0x00;PWMMCR=0x02;PWMMR0=4000;PWMMR6=2000;PWMLER=0x41;PWMPCR=0x4000;PWMTCR=0x09;2、 用定时器匹配后引脚翻转功能使LED灯1秒闪烁一次。#include config.h#defi

2、ne LED 13void _irq IRQ_Time0() while(T0IR&0x01)=0); T0IR=0x01; VICVectAddr=0x00; void Time0Init() T0PR = 99;T0MCR = 0x03; T0MR0 = /4; T0TCR = 0x03; T0TCR = 0x01; T0EMR=0X30;VICIntSelect = 0x00;VICVectCntl0 = 0x24;VICVectAddr0 = (uint32)IRQ_Time0; VICIntEnable = 0x;int main() PINSEL0 = 0x; IOCLR=LED;

3、 Time0Init(); while(1); return 1;3、 上位机发送一个数字字符给下位机（1-8），下位机接受到这个字符若为“1”，则点亮一盏灯，“2”点亮2盏灯。“8”点亮8盏灯。4、 设外部中断为FIQ快速中断，按键按下，灯的亮灭状态改变。/*注意：需要在LPC2106.h中添加EXTMODE和EXTPOLAR寄存器*/#include config.h#define LED 0x01void _irq IRQ_SPR()if(IOPIN&0X01)=0)IOSET=0X01;elseIOCLR=0X01;while(EXTINT&0X02)!=0)EXTINT=0x02;/

4、中断初始化void EINT_init()PINSEL0=0X;/选择P0.14为中EINT1，P0.0为GPIOVICIntSelect=/*/(115);/设置EINT1为FIQ中断VICIntEnable=(10;i-)for(j=5000;j0;j-);uint32 dis_tab16=0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71;int main()int i;PINSEL0=0;IODIR=LED;while(1)for(i=0;i0;i-) for(j=110;j0;

5、j-) ;int main(void) const uint a8=0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0xff;PINSEL0 = 0x;PINSEL1 = 0x;IODIR = 0xFFFF;while (1) uchar i; for (i=0;i8;i+) IOSET = (CSi) & (0xFF00) | ai; delay(20); IOCLR = 0xFFFF; return 0;9、使用中断，2按键，2灯。不同按键控制不同灯，按键按下，所控制的灯的状态改变。修改头文件1）在#define MAMTIM (*(volatile unsigned

6、 char *) 0xE01FC004)/定时控制添加：#define EXTMODE (*(volatile unsigned char *) 0xE01FC148)#define EXTPOLAR(*(volatile unsigned char *) 0xE01FC14C)#include config.h#define d1 10/第一盏灯#define d2 1=10)temp+=6;/个位大于9进位，改0if(temp&0x00ff)0x99)temp+=0x060;/十位大于9进位，改0IOCLR=LED;IOSET=temp;while(EXTINT&0x01)!=0)EXTI

7、NT=0x01;VICVectAddr=0x00;/清零void _irq IRQ_Eint1()temp=VICIRQStatus;IOCLR=LED;IOSET=0;while(EXTINT&0x02)!=0)EXTINT=0x02;VICVectAddr=0x00;/减法void _irq IRQ_Eint2() temp=VICIRQStatus;temp=IOSET;temp-;if(temp&0x000f)=0xf)/temp-，个位出现f,执行下边操作temp&=0xf9;/个位f-9-，十位保留if(temp&0x00f0)=0xf0)/temp-,十位出现f,执行下边操作te

8、mp&=0x9f;/十位f-9,个位保留IOCLR=LED;IOSET=temp;while(EXTINT&0x04)!=0)EXTINT=0x04;VICVectAddr=0x00;void EXTINT_Init()VICIntSelect=0x;VICVectCntl0=0x2e;VICVectAddr0=(int)IRQ_Eint0;VICVectCntl1=0x2f;VICVectAddr1=(int)IRQ_Eint1;VICVectCntl2=0x30;VICVectAddr2=(int)IRQ_Eint2;VICIntEnable=0x0001c000;EXTINT=0x07;

9、int main()PINSEL0=0xa;PINSEL1=0x;EXTINT_Init();IODIR=LED;IOCLR=LED;while(1);return 0;11、以GPIO的方式控制LCD1602输出两行，第一行显示邮箱，第二行显示电话号#include config.h#define rs (18)#define rw (19)#define en (110)#define busy (19)data_buf0 = 0;Display(data_buf0+1);data_buf0+;ISendStr(EEPROM,0x00,data_buf,1);/写入数据到EEPROM 0x

10、00while(1);return 0;void DelayNS(uint32 dly) uint32 i; for(; dly0; dly-) for(i=0; i50000; i+);void Display(uint8 num)switch(num)case 0:/0IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x3F8;break;case 1:/1IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 2:/2IOCLR |= (IOCLR & 0xFFFF00FF)

11、|(0xFF8);IOSET |= 0xB8;break;case 3:/3IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xF8;break;case 4:/4IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 5:/5IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xD8;break;case 6:/6IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xD8;break;case

12、 7:/7IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 8:/8IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xF8;break;case 9:/9IOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xF8;break;case 10:/AIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 11:/BIOCLR |= (IOCLR & 0xFFFF00F

13、F)|(0xFF8);IOSET |= 0xC8;break;case 12:/CIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 13:/DIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0xE8;break;case 14:/EIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;case 15:/FIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;

14、default:/offIOCLR |= (IOCLR & 0xFFFF00FF)|(0xFF8);IOSET |= 0x8;break;13、利用PWM和按键，实现按键按下，脉宽增加的功能。#include config.h#define KEY1 0x /*P0.14引脚连接KEY1*/void WaitKey() uint32 i; while(1) while(IOPIN&KEY1)!=0); for(i=0;i=4000) pwmdata=0; return 0;14、利用数码管显示8个按键的按键序号，例如：第一个按键按下显示“1”，第二个按键按下显示“2”，以此类推。#includ

15、e config.h#define key (0xff0;i-)for(j=110;j0;-j);/*判断按键*/void waitkey()if(IOPIN&key)!=key)/判断有键按下delay(1000);/延时去抖if(IOPIN&key)!=key)/再次判断按键IOCLR=0xff;/清0switch(IOPIN&key)case 0x0000fe00:/键1IOSET=0x00FF06;break;case 0x0000fd00:/键2IOSET=0x00FF5b;break;case 0x0000fb00:/键3IOSET=0x000FF4f;break;case 0x0

16、000f700:/键4IOSET=0x00FF66;break;case 0x0000ef00:/键5IOSET=0x00FF6d;break;case 0x0000df00:/键6IOSET=0x00FF7d;break;case 0x0000bf00:/键7IOSET=0x0000FF07;break;case 0x00007f00:/键8IOSET=0x0000FF7f;break;while(IOPIN&key)=key);/等待按键抬起int main()PINSEL0=0x0;/GPIO功能IODIR=0xFF;/输入输出while(1)waitkey();return 0;15、

17、利用WDT，控制LED1-LED4显示输出。程序先对LED1-LED4闪烁3次，并进行喂狗处理；然后只点亮LED1，并进入死循环，等待WDT复位；#include config.h#define LEDCON 0xfvoid WdtFeed(void) WDFEED = 0xAA; WDFEED = 0x55;void DelayNS(uint32 dly) uint32 i; for(; dly0; dly-) for(i=0; i1000; i+)WdtFeed(); int main(void) uint8 i; IODIR = LEDCON; WDTC = ; WDMOD = 0x03

18、; WdtFeed(); for(i=0; i0; dly-) for(i=0; i5000; i+);void MSpiIni(void) S0SPCCR = 0x52; S0SPCR = 0x30;uint8 MSendData(uint8 data) IOCLR = HC595_CS; S0SPDR =data; while( 0=(S0SPSR&0x80) ); IOSET = HC595_CS; return (S0SPDR); uint8 const DISP_TAB16 = 0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x7

19、7,0x7c,0x39,0x5e,0x79,0x71;uint8 rcv_data; int main(void) uint8 i; PINSEL0 = 0x; PINSEL1 = 0x; IODIR = HC595_CS; MSpiIni(); while(1) for(i=0; i0;dly-) for(i=0;i50000;i+);void MSpiIni(void) S0SPCCR=0x52; S0SPCR=0x30; uint8 MSendData(uint8 data) IOCLR=HC595_CS; S0SPDR=data; while(0=(S0SPSR&0x80); IOSE

20、T=HC595_CS; return(S0SPDR);uint8 DISP_TAB33=0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80, 0x80,0x40,0x20,0x10,0x08,0x04,0x02,0x01, 0x00,0xFF,0x00,0xFF,0x00, 0x18,0x24,0x42,0x81, 0x01,0x04,0x10,0x40, 0x02,0x08,0x20,0x80 ; int main(void) uint8 rcv_data; uint8 i; PINSEL0=0x; PINSEL1=0x; IODIR=HC595_CS; MSpi

21、Ini(); rcv_data=MSendData(0); while(1) for (i=0;i0;dly-) for(i=0;i50000;i+);void UART0_Ini(void) U0LCR=0x83; U0DLL=0x12; U0DLM=0x00; U0LCR=0x03;void UART0_SendByte(uint8 data) U0THR=data; while(U0LSR&0x40)=0); void UART0_SendStr(uint8 const *str) while(1) UART0_SendByte(*str+); if(*str=0) UART0_Send

22、Byte(r); UART0_SendByte(n); break; int main(void) uint8 const SEND_STRING=zhangyunan!n; PINSEL0=0x; PINSEL1=0x; UART0_Ini(); UART0_SendStr(SEND_STRING); DelayNS(10);20、利用UART串口，完成一个字符串的写入和回写功能，要求每4个字符触发一次，返回刚才写入的字符。#include config.h#define LED1CON 0x #define FPCLK Ltypedef struct UartMode uint8 data

23、b; uint8 stopb; uint8 parity; UARTMODE;uint8 rcv_buf9; uint8 rcv_new; uint32 i;void _irq IRQ_UART0(void) i=IOSET; if(i&LED1CON)=0) IOSET=LED1CON; else IOCLR=LED1CON; if(0x04=(U0IIR&0x0F)rcv_new=1; for(i=1;i5;i+) rcv_bufi=U0RBR; for(i=5;i9;i+) rcv_bufi=rcv_bufi-4; VICVectAddr=0x00; void SendByte(uint

24、8 data) U0THR=data; while(U0LSR&0x20)=0); void ISendBuf(void) uint8 i; SendByte(n); for(i=1;i)return(0); if(set.datab8)return(0); if(0=set.stopb)|(set.stopb2)return(0); if(set.parity4)return(0); U0LCR=0x80; bak=(FPCLK4)/baud; U0DLM=bak8; U0DLL=bak&0xff; bak=set.datab-5; if(2=set.stopb)bak|=0x04; if(

25、0!=set.parity)set.parity=set.parity-1;bak|=0x08; bak|=set.parity4; U0LCR=bak; return(1);int main(void) UARTMODE uart0_set; PINSEL0=0x; PINSEL1=0x; IODIR=LED1CON; rcv_new=0; uart0_set.datab=8; uart0_set.stopb=1; uart0_set.parity=0; UART0_Ini(9600,uart0_set); U0FCR=0x81; U0IER=0x01; VICIntSelect=0x; VICVectCntl0=0x26; VICVectAddr0=(int)IRQ_UART0; VICIntEnable=0x; while(1) if(1=rcv_new) rcv_buf0=r; ISendBuf(); rcv_new=0; return(0);