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Questions tagged [pic18]

The PIC18 series 8 bit microcontrollers manufactured by Microchip Technology.

230 questions
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Setting up a C project with multiple source files in MPLAB

I'm using the MPLAB IDE and the XC8 compiler for a C project for PIC18 devices. I'm building a project with multiple source files and don't know how to make the structure. In the project, I have the following things: A file main.c where the main…
user1544337
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Conflicting declarations in XC8 when using extern struct

I have a variable that is a struct, defined in a .c file: struct { int write_cursor; int read_cursor; message messages[10]; } out_messages = {0, 0}; To make it available in other files I have an .h file with: extern struct { int…
AndreKR
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PIC18F45K22 EUSART1 receive and show on hyper terminal

#include #include char uart_rd; void main(void) { ANSELC = 0; Open1USART(USART_TX_INT_ON & // disables transmission interrupt USART_RX_INT_OFF &// disables reception interrupt …
akumar
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Alternative ZigBee Stack

Is there any stack that can be an alternative for the Microchip ZigBee Stack? I have a PIC18F27J53 microcontroller and MRF24J40MB Transceiver. I tried to read and understand the examples included in the Microchip ZigBee Stack but I have no luck. I…
edmandie
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What does the Timer1 RD16 bit do on PIC18 microcontrollers?

I'm really confused. The manual says: RD16: 16-bit Read/Write Mode Enable bit 1= Enables register Read/Write of Timer1 in one 16-bit operation 0= Enables register Read/Write of Timer1 in two 8-bit operations However, there doesn't actually seem to…
Nate
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ADC Set up for pic18f1xk22 in C

Beginner trying to learn ADC setup, but unfortunately most examples online are for other pic18 models, and I don't have the adc.h definition as a resource. (Or else not for C code.) Don't want to be spoon-fed an answer really, but if anyone could…
jos
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Microchip C18 naked function

Someone knows a way to declare a naked function on C18 compiler? By naked function I mean function without any epilogue and prologue. in gcc I use: __attribute__((naked)) int func(int par1) Maybe a #pragma or some trick to have the same…
Gustavo Vargas
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Reading state of input pins on a PIC18

I have been able to get outputs working on my PIC and can make a bunch of LEDs dance on and off as I set various output latches high/low. However, I'm having a lot o difficulty reading in the state of a pin. See the code below. I set up my config,…
Ozzah
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Why won't this PIC code light up my LEDs?

The following code won't set any of the pins high on my PIC18F14K50, yet it couldn't be simpler! #include #include void main(void) { // Set ALL pins to output: TRISA = 0; TRISB = 0; TRISC = 0; // Set ALL pins to high: …
Ozzah
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C performance on a PIC board global variables vs. method local

All, I have C functions that are called many times a second as they are part of a control loop on a PIC18 board. These functions have variables that only need method scope, but I was wondering what if any overhead there was to constantly allocating…
schmouder
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How to set up prescaler on ISR to a certain interval in microseconds?

I have a PIC18F87J11 device and I'm supposed to create: 1) a high-priority ISR that's supposed to be triggered every 100ms 2) a low-priority ISR that's supposed to be triggered every 10ms I have a basic knowledge about configuring a pre-scaler, in…
cypher
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Continuously changing PWM with ADC on PIC18F452

I am writing code for generating continuously generated PWM with a potentiometer.The code is given below. The code is working fine, but in some scenarios, it stops working. I get a changing PWM when I give 0–3 volts from the potentiometer. But when…
Zerox
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PIC18f4550 external interrupts is not working

while using interrupts in pic18f4550, I get stuck in external interrupts, and the push button (RB0) is not Inverting (Toggle) the value at PORTD, I used timer0 interrupts which work perfectly, but I can't figure out what the issue is it is with this…
Aizaz
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Problem with PIC18F45K50's ANSELE register

I am trying to make a code for PIC18F45K50, I am trying to use PORTE as digital input, that means I have to clear ANSELE register which controls this pin behavior Working on MPLABX 3.30 i tried this line of code: clrf ANSELE to clear the register,…
Juan Camilo Aguilar Coronado
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crash when clearing uint8_t on pic18f67k22

I'm adding a clock to my program, but for some reason I cannot lower the value of my "sec" variable. I have a millisecond timer that raises a flag every ms. So, every 1000 ms I clear the ms variable; this happens without a problem. Now every 10 (for…
Wesley Kienhuis
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