msp430f5529单片机hc-sr04超声波模块程序串口输出

ID:1039180 · 发表于 2022-7-11 19:55

测距并通过串口打印的例程

单片机源程序如下:

#include "User_Uart.h"
#include "driverlib.h"
void UCS_Init(void)
{
// P1DIR |= BIT0; // ACLK set out to pins
// P1SEL |= BIT0;
P2DIR |= BIT2; // SMCLK set out to pins
P2SEL |= BIT2;
// P7DIR |= BIT7; // MCLK set out to pins
// P7SEL |= BIT7;
P5SEL |= BIT2+BIT3; // Port select XT2
UCSCTL6 &= ~XT2OFF; // Enable XT2
UCSCTL3 |= SELREF_2; // FLLref = REFO
// Since LFXT1 is not used,
// sourcing FLL with LFXT1 can cause
// XT1OFFG flag to set
UCSCTL4 |= SELA_2; // ACLK=REFO,SMCLK=DCO,MCLK=DCO
// Loop until XT1,XT2 & DCO stabilizes - in this case loop until XT2 settles
do
{
UCSCTL7 &= ~(XT2OFFG + XT1LFOFFG + DCOFFG);
// Clear XT2,XT1,DCO fault flags
SFRIFG1 &= ~OFIFG; // Clear fault flags
}while (SFRIFG1&OFIFG); // Test oscillator fault flag
UCSCTL6 &= ~XT2DRIVE0; // Decrease XT2 Drive according to
// expected frequency
UCSCTL4 |= SELS_5 + SELM_5; // SMCLK=MCLK=XT2
}
void Uart_Init(void) // 115200 8N1
{
P4SEL |= BIT4+BIT5; // P4.4,5 = USA1 TXD/RXD
UCA1CTL1 |= UCSWRST; // **Put state machine in reset**
UCA1CTL1 |= UCSSEL__SMCLK ; // SMCLK
UCA1BR0 = 34; // 4MHz 115200 (see User's Guide)
// UCA1BR0 = 输入的时钟源/串口通信速率（取整）
UCA1BR1 = 0; // 4MHz 115200
UCA1MCTL = UCBRS_6; // 输入的时钟源/串口通信速率的余数*8
UCA1CTL1 &= ~UCSWRST; // **Initialize USCI state machine**
// __bis_SR_register(GIE); // Enter LPM0, interrupts enabled
}
#define Trig1(a) if(a==1) P1OUT |= BIT3; else P1OUT &= ~BIT3
unsigned int cap_new = 0; // 首次捕捉的ta0r值
unsigned int cap_old = 0; // 二次捕捉的ta0r值
//char test_num = 10; // 测量次数
char cap_N = 0; // 溢出次数
char state = 0x00; // zhuangtai
long cap_data = 0; // 距离值
//unsigned int dat[test_num]; //通过数组存10次测量值
void Hc_sr_Init(void) // 超声波模块初始化
{
/*
* P1.2 为echo引脚捕获模式
* P1.2 具有端口中断的通用数字I / O ，TA0 CCR1捕获：CCI1A输入，比较：Out1输出 BSL接收输入
* P1.3 为Trig 数字i/o模式
* P1.3 具有端口中断的通用数字I / O ， TA0 CCR2捕获：CCI2A输入，比较：Out2输出
*/
P1OUT &= ~( BIT2 + BIT3 );
P1DIR |= BIT3;
P1SEL |= BIT2;
/*
* note：由于选用的是P1.2 根据端口定义可知，使用的是TA0CCR1，捕获输入引脚通过TA0CCTL1寄存器控制，
*-捕获值存储在TA0CCR1中。
* TASSEL：SNCLK; 分频：4MHz/8 = 500k；计数模式：0 ==> 0xFFFF;
* TA0CCTL1：上升沿捕获；同步捕捉；捕获模式；CCI1A输入；
*/
TA0CTL = TASSEL__SMCLK + ID__8 + MC_2 + TACLR + TAIE;
TA0CCTL1 = CM_1 + SCS +CAP + CCIE + CCIS_0;
}
void Hc_sr_Open(void) //生成一个持续10us的高电平
{
Trig1(1);
__delay_cycles(40);
Trig1(0);
}
#pragma vector=TIMER0_A1_VECTOR
__interrupt void TIMER0_A1_ISR(void)
{
switch(__even_in_range(TA0IV,14))
{
case 0:break; // No interrupt
case 2:
state = TA0CCTL1 >> 14;
TA0CCTL1 &= ~CCIFG;
if( TA0CCTL1 & CM_1){
cap_new = TA0CCR1;
TA0CCTL1 &= ~CM_1;
TA0CCTL1 |= CM_2;
}else if ( TA0CCTL1 & CM_2){
cap_old = TA0CCR1;
cap_data = ( cap_old - cap_new ) * 0.34;
UARTprintf("\n\ncap_data: %u mm",cap_data);
TA0CCTL1 &= ~CM_2;
TA0CCTL1 |= CM_1;
}else UARTprintf("\nstate: %x",state); // 判断CM位捕捉模式
// UARTprintf("\n yes! ccr1 \nTA0 CCR1: %u TA0R: %u",TA0CCR1,TA0R);
break; // CCR1 not used
case 4: break; // CCR2 not used
case 6: break; // reserved
case 8: break; // reserved
case 10: break; // reserved
case 12: break; // reserved
case 14:
TA0CTL &= ~TAIFG;
if(cap_old < cap_new ){
cap_N += 1;
}
break; // overflow
default: break;
}
}
void main (void)
{
WDT_A_hold(WDT_A_BASE);
Uart_Init();
UCS_Init();
Hc_sr_Init();
__bis_SR_register(GIE);
UARTprintf("\nInitialization is complete!");
while(1)
{
Hc_sr_Open();
__delay_cycles(1000000);
}
}

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代码下载:

HCSR04.zip (655.34 KB, 下载次数: 48)

ID:935312 · 发表于 2022-7-29 01:48

头文件用不了

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msp430f5529单片机hc-sr04超声波模块程序 串口输出

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msp430f5529单片机hc-sr04超声波模块程序串口输出