Cantafford
Member
Hey,
I'm trying to simulate a temperature sensor connected to a PC via RS232 protocol controlled with a PIC18f2550 microcontroller.
The program is supposed to do the simple task of reading an analog value(the temperature) and display it on a virtual terminal when I press a button.
I wrote the following code:
And the header.h:
This is the schematic:
I have the following problem: The temperature is displayed as a binary value not as a decimal one. For temperature range: 1-100 it displays 0 and for temperature 100-150 it displays 1 on the virtual terminal. Please help me correct this issue. Thank you.
Also: I would like to delete one character from the terminal's screen. In my case the temperature value(not clear the entire screen just delete something as if I would do with backspace on a keyboard). Is that possible? Is there such a command?
Thank you for reading.
I'm trying to simulate a temperature sensor connected to a PC via RS232 protocol controlled with a PIC18f2550 microcontroller.
The program is supposed to do the simple task of reading an analog value(the temperature) and display it on a virtual terminal when I press a button.
I wrote the following code:
Code:
/*
* File: main.c
* Author: Paul
*
* Created on August 30, 2016, 11:34 AM
*/
#include <stdio.h>
#include <stdlib.h>
#include "header.h"
#include <plib/usart.h>
void configureADC();
void configureUSART();
void main()
{
OSCCON = 0x7F; // 8Mhz internal oscillator
TRISCbits.RC0 = 1;
configureADC();
float temperature = 0;
unsigned char buf[20];
unsigned char Txdata1[] = "Temperature sensor with RS232 communication";
unsigned char Txdata2[] = "Temperature is: ";
configureUSART();
while(BusyUSART()); //Check if Usart is busy or not
putsUSART(Txdata2); //transmit the string2
START:
GODONE = 1; // start conversion
for(int delay=0; delay<=10; delay++) __delay_ms(5);
while(GODONE); // wait for conversion to finish
temperature = (ADRES*5) / 1024; // 10 bit ADC(voltage reference 5V)
sprintf(buf, "%.3g", temperature); // Convert temperature float value to string
while(BusyUSART());
putsUSART(buf);
while(1) // when button is pressed display new temperature
{
if (PORTCbits.RC0 == 0)
{
for(int delay=0; delay<=30; delay++) __delay_ms(5);
goto START;
}
}
}
void configureADC()
{
TRISAbits.TRISA0 = 1;
ADCON0 = 0x01; // channel 0 selected / enable ADC
ADCON1 = 0x0E; // references selected
ADCON2 = 0b10001000; // right justified,TAD, FOSC/2
}
void configureUSART()
{
OpenUSART( USART_TX_INT_OFF &
USART_RX_INT_OFF &
USART_ASYNCH_MODE &
USART_EIGHT_BIT &
USART_CONT_RX &
USART_BRGH_HIGH &
USART_ADDEN_OFF,
52);
}And the header.h:
Code:
// PIC18F2550 Configuration Bit Settings
// 'C' source line config statements
#include <xc.h>
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
// CONFIG1L
#pragma config PLLDIV = 1 // PLL Prescaler Selection bits (No prescale (4 MHz oscillator input drives PLL directly))
#pragma config CPUDIV = OSC1_PLL2// System Clock Postscaler Selection bits ([Primary Oscillator Src: /1][96 MHz PLL Src: /2])
#pragma config USBDIV = 1 // USB Clock Selection bit (used in Full-Speed USB mode only; UCFG:FSEN = 1) (USB clock source comes directly from the primary oscillator block with no postscale)
// CONFIG1H
#pragma config FOSC = INTOSCIO_EC// Oscillator Selection bits (Internal oscillator, port function on RA6, EC used by USB (INTIO))
#pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)
// CONFIG2L
#pragma config PWRT = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOR = OFF // Brown-out Reset Enable bits (Brown-out Reset disabled in hardware and software)
#pragma config BORV = 3 // Brown-out Reset Voltage bits (Minimum setting)
#pragma config VREGEN = OFF // USB Voltage Regulator Enable bit (USB voltage regulator disabled)
// CONFIG2H
#pragma config WDT = OFF // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)
// CONFIG3H
#pragma config CCP2MX = ON // CCP2 MUX bit (CCP2 input/output is multiplexed with RC1)
#pragma config PBADEN = OFF // PORTB A/D Enable bit (PORTB<4:0> pins are configured as digital I/O on Reset)
#pragma config LPT1OSC = OFF // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = OFF // MCLR Pin Enable bit (RE3 input pin enabled; MCLR pin disabled)
// CONFIG4L
#pragma config STVREN = ON // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = ON // Single-Supply ICSP Enable bit (Single-Supply ICSP enabled)
#pragma config XINST = OFF // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))
// CONFIG5L
#pragma config CP0 = OFF // Code Protection bit (Block 0 (000800-001FFFh) is not code-protected)
#pragma config CP1 = OFF // Code Protection bit (Block 1 (002000-003FFFh) is not code-protected)
#pragma config CP2 = OFF // Code Protection bit (Block 2 (004000-005FFFh) is not code-protected)
#pragma config CP3 = OFF // Code Protection bit (Block 3 (006000-007FFFh) is not code-protected)
// CONFIG5H
#pragma config CPB = OFF // Boot Block Code Protection bit (Boot block (000000-0007FFh) is not code-protected)
#pragma config CPD = OFF // Data EEPROM Code Protection bit (Data EEPROM is not code-protected)
// CONFIG6L
#pragma config WRT0 = OFF // Write Protection bit (Block 0 (000800-001FFFh) is not write-protected)
#pragma config WRT1 = OFF // Write Protection bit (Block 1 (002000-003FFFh) is not write-protected)
#pragma config WRT2 = OFF // Write Protection bit (Block 2 (004000-005FFFh) is not write-protected)
#pragma config WRT3 = OFF // Write Protection bit (Block 3 (006000-007FFFh) is not write-protected)
// CONFIG6H
#pragma config WRTC = OFF // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) are not write-protected)
#pragma config WRTB = OFF // Boot Block Write Protection bit (Boot block (000000-0007FFh) is not write-protected)
#pragma config WRTD = OFF // Data EEPROM Write Protection bit (Data EEPROM is not write-protected)
// CONFIG7L
#pragma config EBTR0 = OFF // Table Read Protection bit (Block 0 (000800-001FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF // Table Read Protection bit (Block 1 (002000-003FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF // Table Read Protection bit (Block 2 (004000-005FFFh) is not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF // Table Read Protection bit (Block 3 (006000-007FFFh) is not protected from table reads executed in other blocks)
// CONFIG7H
#pragma config EBTRB = OFF // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) is not protected from table reads executed in other blocks)
#define _XTAL_FREQ 8000000This is the schematic:
I have the following problem: The temperature is displayed as a binary value not as a decimal one. For temperature range: 1-100 it displays 0 and for temperature 100-150 it displays 1 on the virtual terminal. Please help me correct this issue. Thank you.
Also: I would like to delete one character from the terminal's screen. In my case the temperature value(not clear the entire screen just delete something as if I would do with backspace on a keyboard). Is that possible? Is there such a command?
Thank you for reading.
.
