while(1)
{
if(PIR1bits.RCIF == 1) // if the USART receive interrupt flag has been set TO ZERO
{
while(!TXSTAbits.TRMT );// Wait until TXREG is empty
{
TXREG = RCREG; // echo received data back to sender
}
}
}while(1)
{
if(PIR1bits.RCIF == 1) // if the USART receive interrupt flag has been set TO ZERO
{
while(!TXSTAbits.TRMT );// Wait until TXREG is empty
{
TXREG = RCREG; // echo received data back to sender
}
}
}
Hi misterT.
SPBRG = 25; // "25" calculated using formula from table 20-1 in the PIC18F4550 datasheet
RCSTAbits.SPEN = 1; // enable serial port (configures RX/DT and TX/CK pins as serial port pins)
TXSTAbits.TXEN = 1; // transmit enabled
RCSTAbits.CREN = 1; // enable receiver
LATBbits.LATB0 = 0; // RB-0 to High //turn LEDs of on start up
LATBbits.LATB1 = 0; // RB-1 to High
while(1)
{
if(PIR1bits.RCIF == 1) // if the USART receive interrupt flag has been set TO ZERO
{
while(!TXSTAbits.TRMT );// Wait until TXREG is empty
{
TXREG = RCREG; // echo received data back to sender
if(a == 'f')
{
LATBbits.LATB0 = 1; // RB-0 to High
LATBbits.LATB1 = 1; // RB-1 to High
}
}
}
}
Yes!! But I think we can assume the baud rate is out anyway... but not by much!!
TXREG = RCREG; // echo received data back to sender
if(a == 'f')a = RCREG;
TXREG = a; // echo received data back to sender
if(a == 'f')
// INCLUDE PIC18F4550 HEADERS (LIBRARIES) -------------------------------------------------------------------------------------------------------------------------------------------------------------
#include<p18f4550.h>
#include<delays.h> //Library for delays IMPORTANT TO INCLUDE THIS LIBRARY FOR DELAYS ()()()()()()()()()()()()()()()()()()()()()()()()()()
// COMPILER DIRECTIVES FOR CHIP CONFIGURATION BITS ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
#pragma config FOSC = HSPLL_HS // Since a 20MHz Xtal is used, set FOSC to HSPLL_HS (HS stands for high speed)
#pragma config PLLDIV = 5 // Divide the 20MHz by 5 to provide 4 MHz input to the 96 MHz PLL
#pragma config CPUDIV = OSC1_PLL2 // Divide 96 MHz PLL output by 2 to get 48 MHz system clock
#pragma config USBDIV = 2 // USB clock coming from 96 MHz PLL output is divided by 2
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor disabled (this is used to stop operation when frequency gets out of tollerance--usually used for medical applications)
#pragma config IESO = OFF // Oscillator Switchover mode disabled
#pragma config PWRT = OFF // Enable Power-up timer (This causes the PIC to delay until full operating voltage is reached before the program starts)
#pragma config BOR = ON // Enable Brown-out reset (This automatically put the PIC in reset if the power coming into the chip isn't sufficient to work reliably, hence preventing malfunctions)
#pragma config VREGEN = ON // Use internal USB voltage regulator from 5V to 3.3V
#pragma config WDT = OFF // Disable Watchdog timer (This is used so when the system see that it may not be working as expected, it automatically resets the PIC)
#pragma config MCLRE = ON // Enable MCLR Enable (MCLR is pin 1 of the PIC. When ground is applied it resets the PIC)
#pragma config LVP = OFF // Disable low voltage ICSP (This is another way to program the PIC. Since not used - Disable)
#pragma config ICPRT = OFF // Disable dedicated programming port (44-pin devices) (This is a Dedicated In-Circuit Debug/Programming Port)
#pragma config CP0 = OFF // Disable code protection (Used to protect the program from being coppied)
// INITIALIZE FUNCTIONS (Prototyping the functions) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
// MAIN FUNCTION -----------------------------------------------------------------------------------------------------------------------------------------------------------------------
void Configurate_USART (void)
{
//LEDs
TRISB = 0xF0 ; // PORT B Setting: Set all the pins in port B to Output.
// USART configuration
TXSTAbits.TX9 = 0; // 8-bit transmission
TXSTAbits.TXEN = 1; // Transmit enabled
TXSTAbits.SYNC = 0; // Asynchronous mode
TXSTAbits.BRGH = 1; // High speed
RCSTAbits.SPEN = 1; // Enable serial port - configures RX/DT and TX/CK pins as serial port pins
RCSTAbits.RX9 = 0; // 8-bit reception
RCSTAbits.CREN = 1; // Enable receiver
BAUDCONbits.BRG16 = 0; // 8-bit baud rate generator
SPBRG = 129; //calculated
SPBRGH = 0;
TRISCbits.RC6 = 1; // make the TX pin a digital output
TRISCbits.RC7 = 1; // make the RX pin a digital input
}
void main(void)
{
char Temp_Instruction;
Configurate_USART();
while(1)
{
if(PIR1bits.RCIF == 1) // if the USART receive interrupt flag has been set
{
Temp_Instruction = RCREG;
/*
if(Temp_Instruction == 'a')
{
LATBbits.LATB0 = 1; // RB-0 to High
LATBbits.LATB1 = 1; // RB-1 to High
RCREG = 0; //Empty register
}
if(Temp_Instruction == 'b')
{
LATBbits.LATB0 = 0; // RB-0 to Low
LATBbits.LATB1 = 0; // RB-1 to Low
RCREG = 0; //Empty register
}*/
while(!TXSTAbits.TRMT);
TXREG =Temp_Instruction; // echo received data back to sender
}
}
