单片机复习题答案.doc

复习题
考试时间：90分钟
试题1：小灯闪烁
要求利用LauncnPad上的LED小灯(P1.0 P1.6)，通过循环延时程序控制小灯闪烁，要求修改内部DCO系统时钟，控制小灯闪烁的速度，要求至少有四种明显变化的速度。要求画出硬件接线图。
主程序：
#include <msp430g2553.h>
void GPIO_init();
void BCSplus_init(void);
void P1_IODect();
void P13_Onclick();
void main()
{
WDTCTL=WDTPW+WDTHOLD;
GPIO_init();
_EINT();
_enable_interrupts();
while(1)
{
P1OUT^=BIT0;
P1OUT^=BIT6;
__delay_cycles(1000000);
}

}

void GPIO_init()
{
P1DIR|=BIT0+BIT6;
P1OUT|=BIT0;
P1OUT&=~BIT6;
P1IFG&=BIT0;
P1REN|=BIT3;
P1OUT|=BIT3;
P1DIR&=~BIT3;
P1IES|=BIT3;
P1IE|=BIT3;
}
void P1_IODect()
{

unsigned char Push_Key=0;
Push_Key=P1IFG&(~P1DIR);
__delay_cycles(10000);
if((P1IN&Push_Key)==0)
{
switch(Push_Key)
{
case BIT0: break;
case BIT1: break;
case BIT2: break;
case BIT3: P13_Onclick();break;
default:break;
}
}
}
#pragma vector=PORT1_VECTOR
__interrupt void P1_ISR(void)
{
_DINT();
P1_IODect();
P1IFG&=0X00;
_EINT();
}
void P13_Onclick()
{
static unsigned int Freq=0;
if(Freq>3)
{
Freq=0;
}
switch(Freq)
{
case 0:BCSCTL1 = CALBC1_1MHZ; DCOCTL = CALDCO_1MHZ;break;
case 1:BCSCTL1 = CALBC1_8MHZ; DCOCTL = CALDCO_8MHZ;break;
case 2:BCSCTL1 = CALBC1_12MHZ; DCOCTL = CALDCO_12MHZ;break;
case 3:BCSCTL1 = CALBC1_16MHZ; DCOCTL = CALDCO_16MHZ;break;
default:break;
}
Freq++;
}

试题2：LCD显示学号
在提供的段式LCD驱动程序基础上，编写主程序显示学号。要求画出硬件接线图。
主程序：
#include<msp430g2553.h>
#include<LCD_128.h>
#include<TCA6416A.h>
#include<HT1621.h>

main()
{
WDTCTL=WDTPW+WDTHOLD;
TCA6416A_Init();
HT1621_init();
while(1)
{
LCD_DisplayDigit(1,10);
LCD_DisplayDigit(4,9);
LCD_DisplayDigit(8,8);
LCD_DisplayDigit(4,7);
LCD_DisplayDigit(1,1);
LCD_DisplayDigit(1,2);
LCD_DisplayDigit(0,3);
LCD_DisplayDigit(3,4);
HT1621_Reflash(LCD_Buffer);
}
}
显示为本人学号
试题3：流水灯
在提供的TCA6416驱动程序基础上，要求首先实现8个外扩小灯的循环显示即流水灯功能，循环显示方式为：(要求画出硬件接线图)
● ○○○○○○○à○●○○○○○○à○○●○○○○○à○○○●○○○○à○○○○●○○○à○○○○○●○○à○○○○○○●○à○○○○○○○●à●○○○○○○○
加入TCA6416A.c
void LEDFlash(void)
{
unsigned char out0_7[2]={0};
unsigned char Flag1=0x7F;
unsigned char Flag2=0xFE;
unsigned int i;
for(i=0;i<8;i++)
{
out0_7[0] = Out_CMD0;
out0_7[1] = Flag1;
Flag1=(Flag1>>1)|0x80;
TCA6416_Tx_Frame(out0_7,2); // 将更新后的数据包，写入芯片寄存器
__delay_cycles(16000000);

}
for(i=0;i<8;i++)
{
out0_7[0] = Out_CMD0;
out0_7[1] = Flag2;
Flag2=(Flag2<<1)|0x01;
TCA6416_Tx_Frame(out0_7,2); // 将更新后的数据包，写入芯片寄存器
__delay_cycles(16000000);

}

}
主程序：
#include <msp430g2553.h>
#include<TCA6416A.h>
void main(void)
{
WDTCTL=WDTPW+WDTHOLD;
TCA6416A_Init();
BCSCTL1 = CALBC1_12MHZ;
DCOCTL = CALDCO_12MHZ;
while(1)
{
LEDFlash();
}
}

试题4：按键外部中断
要求利用LaunchPad板，P1.3外接按键，控制LED小灯（P1.6）状态，通过外部中断实现。要求画出硬件接线图。
主程序：（非常规方法）
#include"msp430g2553.h"
void P13_Onclick();
void P1_IODect();
void GPIO_init();
void main(void)
{
WDTCTL=WDTPW+WDTHOLD;
GPIO_init();
_EINT();
TACTL=TASSEL_2+ID_0+MC_1+TACLR+TAIE+~TAIFG;
TACCTL1=OUTMOD_7;
TACCR0=500;
_BIS_SR(LPM0_bits+GIE);
LPM3;
}
void GPIO_init()
{
P1DIR|=BIT6;
P1SEL|=BIT6;
P1REN|=BIT3;
P1OUT|=BIT3;
P1DIR&=~BIT3;
P1IES|=BIT3;
P1IE|=BIT3;
}
#pragma vector =PORT1_VECTOR
__interrupt void PORT1_ISR(void)
{
P1_IODect();
P1IFG=0;
}
void P1_IODect()
{
unsigned int key=0;
key=P1IFG&(~P1DIR);
__delay_cycles(10000);
if((P1IN&key)==0)
{
switch(key)
{
//case BIT0:P10_Onclick();break;
case BIT3:P13_Onclick();break;
default:break;
}
}
}
void P13_Onclick()
{
static unsigned int Freq=0;
if(Freq>=3)
{
Freq=0;
}
else Freq++;
switch(Freq)
{
case 0:TACCR1=100;break;
case 1:TACCR1=0;break;
case 2:TACCR1=100;break;
case 3:TACCR1=0;break;
default:break;
}
}

试题5:定时器
利用定时器定时0.5S功能，让小灯亮0.5s,暗0.5s方式闪烁。要求采用定时器中断功能实现。
主程序：
#include<msp430g2553.h>
void BCSplus_init(void);
void main(void)
{
WDTCTL=WDTPW+WDTHOLD;
BCSplus_init();
P1SEL=0X00;
P1DIR|=0X01;
P1OUT|=0X01;
while(1)
{
P1OUT^=0X01;
_delay_cycles(500000);
}
}

void BCSplus_init(void)
{

BCSCTL2 = SELM_0 + DIVM_0 + DIVS_0;

if (CALBC1_1MHZ != 0xFF) {

DCOCTL = 0x00;
BCSCTL1 = CALBC1_1MHZ; /* Set DCO to 1MHz */
DCOCTL = CALDCO_1MHZ;
}

BCSCTL1 |= XT2OFF + DIVA_0;

}

试题6：串口控制小灯亮灭
要求通过串口连接实验箱和计算机，编制程序，从PC机发送字符A到单片机，单片机接收后关闭LED小灯。发送字符B到单片机，单片机接收后点亮LED小灯。
主程序：
#include "msp430g2553.h"
void UART_RX(void);
unsigned char temp;
void main(void)
{
// CSL_init(); // Activate Grace-generated configuration
WDTCTL = WDTPW + WDTHOLD;
P1DIR|=BIT0;
P1SEL = BIT1 + BIT2;
P1SEL2 = BIT1 + BIT2;
if (CALBC1_1MHZ != 0xFF) {
DCOCTL = 0x00;
BCSCTL1 = CALBC1_1MHZ; /* Set DCO to 1MHz */
DCOCTL = CALDCO_1MHZ;
}
UCA0CTL1 |= UCSWRST;
UCA0CTL1 = UCSSEL_2 + UCSWRST;
UCA0MCTL = UCBRF_0 + UCBRS_1;
UCA0BR0 = 104;
UCA0CTL1 &= ~UCSWRST;
IFG2 &= ~(UCA0RXIFG);
IE2 |= UCA0RXIE;
__bis_SR_register(GIE);

LPM0;

}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR_HOOK(void)
{
UART_RX();
}

void UART_RX(void)
{
temp=UCA0RXBUF;

if(temp=='B')
P1OUT|=BIT0;
Else if(temp=='A')
P1OUT&=~BIT0;
while (!(IFG2&UCA0TXIFG));
UCA0TXBUF=temp;
}
题7：串口通信
要求通过串口连接实验箱和计算机，编制程序，从PC机发送字符到单片机，单片机在LCD上显示接收到的字符。
#include<msp430g2553.h>
#include<LCD_128.h>
#include<TCA6416A.h>
#include<HT1621.h>
void UART_RX(void);
unsigned char temp;
void main(void)
{
// CSL_init(); // Activate Grace-generated configuration
WDTCTL = WDTPW + WDTHOLD;
P1DIR|=BIT0;
P1SEL = BIT1 + BIT2;
P1SEL2 = BIT1 + BIT2;
if (CALBC1_1MHZ != 0xFF) {
DCOCTL = 0x00;
BCSCTL1 = CALBC1_1MHZ; /* Set DCO to 1MHz */
DCOCTL = CALDCO_1MHZ;
}
UCA0CTL1 |= UCSWRST;
UCA0CTL1 = UCSSEL_2 + UCSWRST;
UCA0MCTL = UCBRF_0 + UCBRS_1;
UCA0BR0 = 104;
UCA0CTL1 &= ~UCSWRST;
IFG2 &= ~(UCA0RXIFG);
IE2 |= UCA0RXIE;
__bis_SR_register(GIE);

LPM0;

}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCI0RX_ISR_HOOK(void)
{
UART_RX();
}

void UART_RX(void)
{
temp=UCA0RXBUF;
TCA6416A_Init();
HT1621_init();
LCD_DisplayDigit(temp-48,6);
HT1621_Reflash(LCD_Buffer);
while (!(IFG2&UCA0TXIFG));
UCA0TXBUF=temp;
}
r
试题8：定时器
使用单片机的内部定时器模块，制作电子钟并通过液晶显示时间信息。电子钟能正常运行时在LCD液晶上显示”XX:XX:XX”(时分秒)
主程序：
#include<msp430g2553.h>
#include<LCD_128.h>
#include<TCA6416A.h>
#include<HT1621.h>
int i,j=0,a1,a2,a3;
void js();
void GPIO_init();
main()
{
WDTCTL=WDTPW+WDTHOLD;
TCA6416A_Init();
HT1621_init();
GPIO_init();
js();
}
void js(void)
{
TCA6416A_Init();
HT1621_init();
_DINT();
while(1)
{
i++;
if(i%2)
{
LCD_DisplaySeg(99);
LCD_DisplaySeg(83);
}
if(i%2==0)
{
LCD_ClearSeg(83);
LCD_ClearSeg(99);
}

a1=i/3600;
a2=(i-a1*3600)/60;
a3=i-a1*3600-a2*60;

LCD_DisplayDigit(a1/10%6,1);
LCD_DisplayDigit(a1%10,2 );
LCD_DisplayDigit(a2/10%6,3);
LCD_DisplayDigit(a2%10,4);
LCD_DisplayDigit(a3/10%6,5);
LCD_DisplayDigit(a3%10,6);
__delay_cycles(1000000);
HT1621_Reflash(LCD_Buffer);
}
}

void GPIO_init()
{
P1REN|=BIT3;
P1OUT|=BIT3;
P1DIR&=~BIT3;
P1IES|=BIT3;
P1IE|=BIT3;
}
试题9：温度测量显示
要求MSP430G2553单片机ADC，内部温度传感器进行测量，并把温度结果通过LCD显示。要求画出硬件接线图。
主程序：
#include <msp430.h>
#include <ti/mcu/msp430/csl/CSL.h>
#include<msp430g2553.h>
#include<LCD_128.h>
#include<TCA6416A.h>
#include<HT1621.h>
void ADC10_init(void);
void BCSplus_init(void);
long IntDegc;
unsigned int Value;
int main(int argc, char *argv[])
{
//WDTplus_init();
WDTCTL=WDTPW+WDTHOLD;
TCA6416A_Init();
HT1621_init();
BCSplus_init();
ADC10_init();

while(1)
{
ADC10CTL0|= ENC+ADC10SC;
//while(ADC10DTCL1&BIT0);
Value=ADC10MEM;
IntDegc=((Value-673)*423)/1024;

LCD_DisplayDigit(IntDegc/100,1);
LCD_DisplayDigit(IntDegc/10%10,2);
LCD_DisplayDigit(IntDegc%10,3);
LCD_DisplaySeg(24);
LCD_DisplaySeg(51);
LCD_DisplaySeg(55);
LCD_DisplaySeg(54);
LCD_DisplaySeg(50);
LCD_DisplaySeg(63);
LCD_DisplaySeg(57);
LCD_DisplaySeg(56);
LCD_DisplaySeg(59);
HT1621_Reflash(LCD_Buffer);
}
//return (0);
}
试题10：信号周期检测，并通过串口显示。
要求利用定时器的输入捕捉功能，检测输入信号周期，并通过串口发送给PC显示。
#include "msp430g2553.h"
unsigned char temp;
unsigned char string[]="Please input controled number:";
void putchar(unsigned char c);
void putstr(unsigned char *s);

void main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
if (CALBC1_1MHZ==0xFF) // If calibration constant erased
{
while(1); // do not load, trap CPU!!
}
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_1MHZ; // Set DCO
DCOCTL = CALDCO_1MHZ;

P1DIR|=BIT6;
P1DIR |= BIT2; //P1.2 UART_TX
P1DIR &=~BIT1; //P1.2 UART_RX
P1SEL |= BIT1+BIT2; //select P1.1 and P1.2 as UART port
P1SEL2 |= BIT1+BIT2;

UCA0CTL1 |= UCSWRST;

UCA0CTL1 = UCSSEL_2 + UCSWRST;

UCA0MCTL = UCBRF_0 + UCBRS_1;

UCA0BR0 = 104;

UCA0CTL1 &= ~UCSWRST;
IE2 |= UCA0RXIE;
_EINT();
putstr(string);
LPM0;
//__bis_SR_register(LPM0_bits + GIE); // Enter LPM0, interrupts enabled

}
#pragma vector=USCIAB0RX_VECTOR
__interrupt void USCIA0_ISR(void)
{
while (!(IFG2&UCA0TXIFG)); // USCI_A0 TX buffer ready?
UCA0TXBUF = UCA0RXBUF;

temp=UCA0RXBUF;

if(temp=='A')
{
P1OUT|=BIT6;
}
else
{
P1OUT&=~BIT6;
}

}

void putchar(unsigned char c)
{
while (!(IFG2&UCA0TXIFG));
UCA0TXBUF=c;
}
void putstr(unsigned char *s)
{
IE2&=~UCA0RXIE;
while((*s)!=0)
{
putchar(*s);
s++;
}
putchar('\n');
IE2|=UCA0RXIE;
}
TACTL=TASSEL_2+MC_2+TAIE+TACLR; TACTL=TASSEL_2+MC_2+TAIE+TACLR;
试题11：PWM控制小灯亮度
要求利用LaunchPad开发板上P1.3按键，P1.6TA输出口接LED（用跳线帽连接），编写一段代码，通过按键改变PWM占空比，从而改变LED亮度。要求至少实现四级亮度变化。
#include <msp430g2553.h>
void GPIO_init();
void BCSplus_init(void);
void P1_IODect();
void P13_Onclick();
void main()
{
WDTCTL=WDTPW+WDTHOLD;
GPIO_init();
_EINT();
_enable_interrupts();
while(1)
{
P1OUT^=BIT0;
P1OUT^=BIT6;
__delay_cycles(1000000);
}

}

void GPIO_init()
{
P1DIR|=BIT0+BIT6;
P1OUT|=BIT0;
P1OUT&=~BIT6;
P1IFG&=BIT0;
P1REN|=BIT3;
P1OUT|=BIT3;
P1DIR&=~BIT3;
P1IES|=BIT3;
P1IE|=BIT3;
}
void P1_IODect()
{

unsigned char Push_Key=0;
Push_Key=P1IFG&(~P1DIR);
__delay_cycles(10000);
if((P1IN&Push_Key)==0)
{
switch(Push_Key)
{
case BIT0: break;
case BIT1: break;
case BIT2: break;
case BIT3: P13_Onclick();break;
default:break;
}
}
}
#pragma vector=PORT1_VECTOR
__interrupt void P1_ISR(void)
{
_DINT();
P1_IODect();
P1IFG&=0X00;
_EINT();
}
void P13_Onclick()
{
static unsigned int Freq=0;
if(Freq>3)
{
Freq=0;
}
switch(Freq)
{
case 0:BCSCTL1 = CALBC1_1MHZ; DCOCTL = CALDCO_1MHZ;break;
case 1:BCSCTL1 = CALBC1_8MHZ; DCOCTL = CALDCO_8MHZ;break;
case 2:BCSCTL1 = CALBC1_12MHZ; DCOCTL = CALDCO_12MHZ;break;
case 3:BCSCTL1 = CALBC1_16MHZ; DCOCTL = CALDCO_16MHZ;break;
default:break;
}
Freq++;
}

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