PIC18F字符串蓝牙到Tera Term

Question

我想从PIC的USART输出一个字符串，并让它显示在Tera Term上。我现在用的是：

• PIC18F4331
• Sparkfun Bluesmirf RN-42
• MPLAB v8.85
• 万亿期限

我在此代码已经工作了几几天，我没有看到一个单一的回应。我认为可能导致此问题的一些事情是波特率和/或没有中断例程。但是如果我只是试图传输，是否需要中断？请有人指导我吗？另外，使用printf时，我看到蓝牙的响应，但是以奇怪的符号形式。例如，þþ。

此代码是对在线发现的代码的修改。

// Libraries 
#include <p18f4331.h> 
#include <stdio.h> 

// Configuations 
#pragma config OSC  = XT 
#pragma config WDTEN = OFF 
#pragma config PWRTEN = OFF 
#pragma config FCMEN = OFF 
#pragma config IESO  = OFF 
#pragma config BOREN = ON 
#pragma config BORV  = 27 
#pragma config WDPS  = 128 
#pragma config T1OSCMX = ON 
#pragma config PWMPIN = ON 
#pragma config MCLRE = ON 
#pragma config LVP  = OFF 
#pragma config STVREN = OFF 
#pragma config PWM4MX = RD5 

// Definitions 
#define _XTAL_FREQ 4000000 
#define BAUDRATE 9600 


void EUSART(void) 
{ 
    TRISC = 0b10000000; 
    SPBRG = 25; 
    TXSTAbits.CSRC = 0; // Baud Rate Generated Externally 
    TXSTAbits.TX9 = 0; // 8-Bit Transmission 
    TXSTAbits.TXEN = 1; // Transmit Enabled 
    TXSTAbits.SYNC = 0; // Asynchronous Mode 
    TXSTAbits.BRGH = 1; // High Baud Rate 
    TXSTAbits.TRMT = 0; // Transmit Shift Register When TSR Is Full 
    RCSTAbits.SPEN = 1; // Serial Port Enabled 
    RCSTAbits.RX9 = 0; // 8-Bit Reception 
    RCSTAbits.CREN = 1; // Enables Receive 
} 

void SendByteSerially(unsigned char Byte) // Writes a character to the serial port 
{ 
    while(!PIR1bits.TXIF) ; // wait for previous transmission to finish 
    TXREG = Byte; 
} 

unsigned char ReceiveByteSerially(void) // Reads a character from the serial port 
{ 
    while(!PIR1bits.RCIF) continue; // Wait for transmission to receive 
    return RCREG; 
} 

void SendStringSerially(const rom unsigned char* st) 
{ 
    while(*st) SendByteSerially(*st++); 
} 

void delayMS(unsigned int x) 
{ 
    unsigned char y; 
     for(;x > 0; x--) for(y=0; y< 82;y++); 
} 

void main(void) 
{ 
    unsigned char SerialData; 
    EUSART(); 
    SendStringSerially("Hello World"); 

    while(1) 
    { 
     SerialData = ReceiveByteSerially(); 
     SendByteSerially(SerialData); 
     delayMS(1000); 
    } 
} 

Answer 1

您使用的是PIC18，确保BRG16由于您使用BRGH

BAUDCTL.BRG16 = 0; 

因为SPBRGH16是SPBRG的高字节等于0，而且可以改变波特率值你的USART。

另外，请确保您在PIR1银行。在MPLAB，这将是

banksel PIR1; //Not sure if there's an ending coma 

我的两个通过UART传输功能时，正确初始化（在MIKROC）：

void vTx232 (UC ucSend) 
{ 
    STATUS.RP0 = PIR1;  //Sure we're in PIR1 
    while (PIR1.TXIF == 0);//While last TX not done 
    TXREG = ucSend;  //Input param into TXREG 
} 

void vTxString(UC *ucpString) 
{ 
    while (*ucpString!= 0x00) //While string not at its end 
    { 
     vTx232(*ucpString);  //Send string character 
     ucpString++;    //Increm string pointer 
    } 
}