关于用stc89c52单片机蓝牙遥控器

ID:892737 · 发表于 2021-8-11 16:38

请问一下大家，我这个51遥控器程序有什么问题吗？实物的连接时P1和P3上接着按键，按键另一边全部共地但是按按键时接收端没有反应，手机可以正常控制接收端。
key.h

#include "delay.h"
#define key1 P1 //1111 1111
#define key2 P3 //1111 11 P30:RXD P31:TXD
//extern u8 fx;
/*-----------------------------------------------
按键扫描函数，返回扫描键值
------------------------------------------------*/
unsigned char KeyScan(void)
{
if(key1!=0xff)
{
switch(key1) //1111 1111
{
case 0xfe:return 0x31;break; //left
case 0xfd:return 0x32;break; //right
case 0xfb:return 0x33;break; //left
case 0xf7:return 0x34;break; //right
case 0xef:return 0x35;break; //duoji 1
case 0xdf:return 0x36;break;
case 0xbf:return 0x37;break; //duoji 2
case 0x7f:return 0x38;break;
}
while(key1!=0xff);
}
if(key2!=0xff)
{
switch(key2) //0011 1111
{
case 0xfb:return 0x39;break; //duoji 3
case 0xf7:return 0x40;break;
case 0xef:return 0x41;break; //duoji 4 (夹球)
case 0xdf:return 0x42;break; // (放球)
}
while(key2!=0xff);
}
return 0;

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main.c

#include <reg51.h>
#include <stdio.h>
#include "key.h"
unsigned int receive;
void UART_Init(void)
{
PCON &= 0x7F; //波特率不倍速
SCON = 0x50; // SCON: 模式 1, 8-bit UART, 使能接收
TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit 重装
TH1 = 0xFD; // TH1: 重装值 9600 波特率晶振 11.0592MHz
TL1 = 0xFD;
TR1 = 1; // TR1: timer 1 打开
SM0=0;
SM1=1;
REN=1; //打开总中断
ES= 1; //打开串口中断
TI=1; //正常的话应该是TI = 1;但是为了控制接收先置‘0’；
}
unsigned char num ;
void com_UART0() interrupt 4
{
EA=0;
if(RI==1)
{
}
if (TI)
{
}
EA = 1;
}
unsigned int qwe=0x00;
void main()
{
UART_Init();
while(1)
{
num=KeyScan();
if(num!=qwe)
{
qwe=num;
if(TI==1)
{
SBUF = num;
TI=0;
}
}
}
}

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谢谢！

ID:161164 · 发表于 2021-8-11 17:13

TI是当SBUF有数据放入，并传输完成后才由单片机置1
TI初始值是0，所以if(TI==1)SBUF = num;永不成立
而SBUF没有数据放入，TI永不为1
永远传不了数据出去
应改为：

void com_UART0() interrupt 4
{
EA=0;
if(RI==1)
{
}
if (TI)
{
TI=0;//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
}
EA = 1;
}
unsigned int qwe=0x00;
void main()
{
UART_Init();
while(1)
{
num=KeyScan();
if(num!=qwe)
{
if(TI==0)//<<<<<<<<<<<<<<<<<<<<<<<
{
SBUF = num;
qwe=num;//<<<<<<<<<<<<<<<<<<<<<<<
}
}
}
}

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ID:892737 · 发表于 2021-8-11 17:56

lkc8210 发表于 2021-8-11 17:13
TI是当SBUF有数据放入，并传输完成后才由单片机置1
TI初始值是0，所以if(TI==1)SBUF = num;永不成立
而SB ...

按这样改了，还是不行

ID:161164 · 发表于 2021-8-11 23:04

1196383236 发表于 2021-8-11 17:56
按这样改了，还是不行

单片机接电脑串口
电脑收到数据吗？

ID:161164 · 发表于 2021-8-12 00:52

1196383236 发表于 2021-8-11 17:56
按这样改了，还是不行

看漏了你在UART_Init(void)中的TI=1;

经过一大轮仿真试验
得知按键扫描的while(key!=0xff)被串口脚干扰了
把#define key2 P3 改为#define key2 P2就正常了

ID:892737 · 发表于 2021-8-12 11:08

lkc8210 发表于 2021-8-11 23:04
单片机接电脑串口
电脑收到数据吗？

电脑收不到数据

ID:892737 · 发表于 2021-8-12 11:49

lkc8210 发表于 2021-8-12 00:52
看漏了你在UART_Init(void)中的TI=1;

经过一大轮仿真试验

我把51单片机上本该接蓝牙的P3.0和P3.1接到了usb转ttl上连接电脑，按按键它也没有数据

ID:161164 · 发表于 2021-8-12 14:25

1196383236 发表于 2021-8-12 11:49
我把51单片机上本该接蓝牙的P3.0和P3.1接到了usb转ttl上连接电脑，按按键它也没有数据

有试过RxD和TxD交换吗？

那就用范例代码试一下

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC89-90xx Series MCU UART (8-bit/9-bit)Demo ----------------*/
/* If you want to use the program or the program referenced in the */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/
#include "reg51.h"
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;
#define FOSC 11059200L //System frequency
#define BAUD 9600 //UART baudrate
/*Define UART parity mode*/
#define NONE_PARITY 0 //None parity
#define ODD_PARITY 1 //Odd parity
#define EVEN_PARITY 2 //Even parity
#define MARK_PARITY 3 //Mark parity
#define SPACE_PARITY 4 //Space parity
#define PARITYBIT NONE_PARITY //Testing even parity
sbit bit9 = P2^2; //P2.2 show UART data bit9
bit busy;
void SendData(BYTE dat);
void SendString(char *s);
void main()
{
#if (PARITYBIT == NONE_PARITY)
SCON = 0x50; //8-bit variable UART
#elif (PARITYBIT == ODD_PARITY) || (PARITYBIT == EVEN_PARITY) || (PARITYBIT == MARK_PARITY)
SCON = 0xda; //9-bit variable UART, parity bit initial to 1
#elif (PARITYBIT == SPACE_PARITY)
SCON = 0xd2; //9-bit variable UART, parity bit initial to 0
#endif
TMOD = 0x20; //Set Timer1 as 8-bit auto reload mode
TH1 = TL1 = -(FOSC/12/32/BAUD); //Set auto-reload vaule
TR1 = 1; //Timer1 start run
ES = 1; //Enable UART interrupt
EA = 1; //Open master interrupt switch
SendString("STC89-90xx\r\nUart Test !\r\n");
while(1);
}
/*----------------------------
UART interrupt service routine
----------------------------*/
void Uart_Isr() interrupt 4
{
if (RI)
{
RI = 0; //Clear receive interrupt flag
P0 = SBUF; //P0 show UART data
bit9 = RB8; //P2.2 show parity bit
}
if (TI)
{
TI = 0; //Clear transmit interrupt flag
busy = 0; //Clear transmit busy flag
}
}
/*----------------------------
Send a byte data to UART
Input: dat (data to be sent)
Output:None
----------------------------*/
void SendData(BYTE dat)
{
while (busy); //Wait for the completion of the previous data is sent
ACC = dat; //Calculate the even parity bit P (PSW.0)
if (P) //Set the parity bit according to P
{
#if (PARITYBIT == ODD_PARITY)
TB8 = 0; //Set parity bit to 0
#elif (PARITYBIT == EVEN_PARITY)
TB8 = 1; //Set parity bit to 1
#endif
}
else
{
#if (PARITYBIT == ODD_PARITY)
TB8 = 1; //Set parity bit to 1
#elif (PARITYBIT == EVEN_PARITY)
TB8 = 0; //Set parity bit to 0
#endif
}
busy = 1;
SBUF = ACC; //Send data to UART buffer
}
/*----------------------------
Send a string to UART
Input: s (address of string)
Output:None
----------------------------*/
void SendString(char *s)
{
while (*s) //Check the end of the string
{
SendData(*s++); //Send current char and increment string ptr
}
}

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ID:892737 · 发表于 2021-8-14 09:15

lkc8210 发表于 2021-8-12 14:25
有试过RxD和TxD交换吗？

那就用范例代码试一下

谢谢，解决了，但是有时候它检测不到松开的指令

ID:83626 · 发表于 2021-9-18 20:58

蓝牙开关能被小度在家控制吗？

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