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Questions tagged [pic18]

The PIC18 series 8 bit microcontrollers manufactured by Microchip Technology.

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How to flash the LED with push button - pic18f

I made a simple circuit to blink an LED, but the code does not work in proteus simulation. See the code and the simulation below. #INCLUDE "P18F2550.INC" CONFIG WDT=OFF CONFIG OSC=HS CONFIG LVP=OFF R2 EQU 0x2 R3 EQU 0x3 R4 EQU 0x4 ORG…
Ronald Araújo
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1wire problem in detail

I have defined these functions below, and when I ask Device_ID function for example of the family code, I only get FF (should be 28), acctually I get both the family code, 48-bit serial, and the crc 8 bit to be all "ones". It seems like the detect…
Christian
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Converting 0-5v analog to a rotary encoder equivalent

I'm currently working on a robot as an intern and must choose replacement drivers for the motors. The position information of the axis are given by analog pot. I do have 3 drivers by technosoft that needs a rotary encoder (quadrature) information to…
user2810509
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Timer is not counting on sleep mode with PIC18F?

I have PIC18F87J11 with MPLAB C18. I am trying to limit the consumption of battery by the device by forcing it to go to sleep. I noticed upon entering the sleep mode, timer0 stops counting up any further until awaken. Also the only method I know to…
Ammar
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Long Delay using Delay Functions from C18 Libraries for PIC18

I'm using a PIC18 with Fosc = 10MHz. So if I use Delay10KTCYx(250), I get 10,000 x 250 x 4 x (1/10e6) = 1 second. How do I use the delay functions in the C18 for very long delays, say 20 seconds? I was thinking of just using twenty lines of…
Michael Reed
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How do you write and read to memory with PIC18?

I want to store a number to PIC18 then retain it even if the power is lost or the unit is reset. I think my writing code portion looks fine, just the reading portion of it looks strange after the unit is reset. I am using the following code which I…
Ammar
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Getting Array Values from the user on PIC18?

First let me show what's working then I will show what's not working. This code gives the right result. unsigned long timeOn; long d[10]; d[0] = 8; d[1] = 6; d[2] = 0; d[3] = 0; d[4] = 0; timeOn = 10000*d[0] + 1000*d[1] + 100*d[2] + 10*d[3] + …
Ammar
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PIC 18 / RS232 receive

I am trying to receive some data from an RS232 connection (9600 kbps - sending "s" while(1) ( and tested on hyperterminal ) ) I am using p18F8722 and writing in c the following on the processor: Open1USART ( USART_TX_INT_OFF & USART_RX_INT_OFF &…
user2274358
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RS232 communication in MPlab

I am using MPlab to read data from a pic micro controller. I am using pic18F87J11. The data that I want to read is on pin 3 of the DB9 of the RS232, and my RS232 is connected to the pic micro controller. Can anyone help me or give me a simple sample…
user2226775
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Bit-banged serial on PIC stops working with nested loop in C

Stackoverflow, you've helped me before, I think I need your help again. I'm trying to bit-bang my own serial out using a GPIO on a PIC18F2550. This connects to some shift registers (3x74LS595), where the last one connects to a standard HD44780 LCD.…
BB ON
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PIC Micro computer - using timer 3 as asyn counter - pull up

I am using a PIC18(L)F1XK22. I'm trying to use timer 3 as a synchronous counter. The PIC is running using the internal oscillator. CONFIG FOSC = IRC ; Internal oscillator This should turn off use of pin RA5 as an external…
Mike D
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PIC18F2550 Memory game PIC C18 programming LED off

I am using MPLAB C18 compiler to write c code for a PIC18F2550 which is to control a memory game. The user is to repeat a sequence of flashing LEDs by pressing corresponding buttons. A bit like a old Simon game but with a sequence just happening…
user1912837
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Hitech C data buffers in program memory

The C18 compiler allows variables in program memory with ROM qualifier, but the Hi-Tech C seems rather reluctant to utilize the Havard architecture to its best. So is there a way to create data buffers in program memory with the Hi-Tech C compiler…
Vishnu
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Microchip: How to load more then one HEX file in MPLAB X

I use MPLAB X (sometime MPLAB 8) and i get some project to finish. I have these HEX files: bootloader.hex magic_flag.hex Bootloader is loaded from address 0x0 to 0x7FF. The magic flag has position in address 0x40 (so in bootloader area). And now I…
Lodhart
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PIC18f4620 Receive usart in SDCC

I'm trying to realize the communication of the PC (linux) with a PIC18F4620 for rs232. The Transmition (PIC -> to PC is fine). However, when I try to pass somenthing from the PC to PIC the PIR1bits.RCIF flag is never set and the interrupt does NOT…
Yuri Kaszubowski Lopes
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