Bild 18F46k80 EUART

Question

Ich versuche, Daten über EUSART zum Computer zu übertragen. Ich habe bereits alle konfigurierbaren Bits gesetzt, aber die serielle Kommunikation funktioniert immer noch nicht gut. Ich erhalte nur falsche Daten in meinem PC. Hier ist mein Code für die Einstellung uart (ich bin mit MPLAB Compiler XC8):

TRISC6 = 1; \\ set in datasheet 
TRISC7 = 1; \\ set in datasheet 

SPBRG1=25; \\ 4 MHz oscilator 
SPBRGH1=0; 
TXSTA1bits.BRGH = 1; \\ high speed uart 
BAUDCON1bits.BRG16 = 0; \\ 8 bit data 
TXSTA1bits.TX9 = 0;  
TXSTA1bits.SYNC = 0; \\ asynchronus mode 

RCSTA1bits.SPEN = 1; \\ enable serial port 
INTCONbits.GIE = 0; \\ set off interrupt 
TXSTA1bits.TXEN = 1; \\ transmitter is enabled 
while (1) { 
    TXSTA1bits.TXEN = 1; 
    //UART_Write_Text("Bye pic \n"); 
     TXREG = 76; 
    __delay_ms(100); 
    TXSTA1bits.TXEN = 0; 
} 

Vielen Dank für Hilfe

Answer 1

Der Sendepufferregister muss leer sein, bevor das nächste Byte senden Laden. Aus dem Datenblatt: "Sobald das TXREGx-Register die Daten an das TSR-Register überträgt (tritt in einem TCY auf), ist das TXREGx-Register leer und das TXxIF-Flag-Bit ist gesetzt."

Es scheint, als ob das Objekt wiederholt 'L' bei 9600 Baud mit einer Verzögerung sendet, damit der Host die empfangenen Daten verarbeiten kann. ändern, so zum letzten Zeilen:

TXSTA1bits.TXEN = 1; 
while(1){ 
    while (PIR1bits.TX1IF == 0); 
    TXREG = 76; 
    __delay_ms(100); 
} 

Answer 2

Dies ist mein Code mit Configurate Bits meine externe oscilator für 100% 4 MHz ist, und ich habe nicht Oszilloskop :(

#include <xc.h> 
#include <String.h> 
#include <pic18f46k80.h> 
#define _XTAL_FREQ 4000000 

// #pragma config statements should precede project file includes. 
// Use project enums instead of #define for ON and OFF. 

// CONFIG1L 
// #pragma config statements should precede project file includes. 
// Use project enums instead of #define for ON and OFF. 

// CONFIG1L 
#pragma config RETEN = OFF  // VREG Sleep Enable bit (Ultra low-power regulator is Disabled (Controlled by REGSLP bit)) 
#pragma config INTOSCSEL = LOW // LF-INTOSC Low-power Enable bit (LF-INTOSC in Low-power mode during Sleep) 
#pragma config SOSCSEL = DIG // SOSC Power Selection and mode Configuration bits (Digital (SCLKI) mode) 
#pragma config XINST = OFF  // Extended Instruction Set (Enabled) 

// CONFIG1H 
#pragma config FOSC = XT  // Oscillator (XT oscillator) 
#pragma config PLLCFG = OFF  // PLL x4 Enable bit (Disabled) 
#pragma config FCMEN = OFF  // Fail-Safe Clock Monitor (Disabled) 
#pragma config IESO = OFF  // Internal External Oscillator Switch Over Mode (Disabled) 

// CONFIG2L 
#pragma config PWRTEN = OFF  // Power Up Timer (Disabled) 
#pragma config BOREN = SBORDIS // Brown Out Detect (Enabled in hardware, SBOREN disabled) 
#pragma config BORV = 3   // Brown-out Reset Voltage bits (1.8V) 
#pragma config BORPWR = ZPBORMV // BORMV Power level (ZPBORMV instead of BORMV is selected) 

// CONFIG2H 
#pragma config WDTEN = SWDTDIS // Watchdog Timer (WDT enabled in hardware; SWDTEN bit disabled) 
#pragma config WDTPS = 1048576 // Watchdog Postscaler (1:1048576) 

// CONFIG3H     
#pragma config CANMX = PORTB // ECAN Mux bit (ECAN TX and RX pins are located on RB2 and RB3, respectively) 
#pragma config MSSPMSK = MSK7 // MSSP address masking (7 Bit address masking mode) 
#pragma config MCLRE = ON  // Master Clear Enable (MCLR Enabled, RE3 Disabled) 

// CONFIG4L 
#pragma config STVREN = ON  // Stack Overflow Reset (Enabled) 
#pragma config BBSIZ = BB2K  // Boot Block Size (2K word Boot Block size) 

// CONFIG5L 
#pragma config CP0 = OFF  // Code Protect 00800-03FFF (Disabled) 
#pragma config CP1 = OFF  // Code Protect 04000-07FFF (Disabled) 
#pragma config CP2 = OFF  // Code Protect 08000-0BFFF (Disabled) 
#pragma config CP3 = OFF  // Code Protect 0C000-0FFFF (Disabled) 

// CONFIG5H 
#pragma config CPB = OFF  // Code Protect Boot (Disabled) 
#pragma config CPD = OFF  // Data EE Read Protect (Disabled) 

// CONFIG6L 
#pragma config WRT0 = OFF  // Table Write Protect 00800-03FFF (Disabled) 
#pragma config WRT1 = OFF  // Table Write Protect 04000-07FFF (Disabled) 
#pragma config WRT2 = OFF  // Table Write Protect 08000-0BFFF (Disabled) 
#pragma config WRT3 = OFF  // Table Write Protect 0C000-0FFFF (Disabled) 

// CONFIG6H 
#pragma config WRTC = OFF  // Config. Write Protect (Disabled) 
#pragma config WRTB = OFF  // Table Write Protect Boot (Disabled) 
#pragma config WRTD = OFF  // Data EE Write Protect (Disabled) 

// CONFIG7L 
#pragma config EBTR0 = OFF  // Table Read Protect 00800-03FFF (Disabled) 
#pragma config EBTR1 = OFF  // Table Read Protect 04000-07FFF (Disabled) 
#pragma config EBTR2 = OFF  // Table Read Protect 08000-0BFFF (Disabled) 
#pragma config EBTR3 = OFF  // Table Read Protect 0C000-0FFFF (Disabled) 

// CONFIG7H 
#pragma config EBTRB = OFF  // Table Read Protect Boot (Disabled) 



void main(void) { 

    TRISD = 0; 
    ANCON0 = 0; 
    ANCON1 = 0; 
    TRISA = 0b00001111; 
    TRISE = 0b00000000; 
    TRISB = 0; 


TRISCbits.TRISC6 = 1; // set in datasheet 
TRISCbits.TRISC7 = 1; // set in datasheet 

SPBRG1=25; // 4 MHz oscilator 
SPBRGH1=0; 
TXSTA1bits.BRGH = 1; // high speed uart 
BAUDCON1bits.BRG16 = 0;// 8 bit data 
TXSTA1bits.TX9 = 0; 
TXSTA1bits.SYNC = 0; // asynchronus mode 

RCSTA1bits.SPEN = 1; // enable serial port 
INTCONbits.GIE = 0; // set off interrupt 
TXSTA1bits.TXEN = 1; // transmitter is enabled 

    while (1) { 
     while (PIR1bits.TX1IF == 0); 
    TXREG = 76; 
     __delay_ms(100); 
    } 


    return; 
}