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Questions tagged [pic18]

The PIC18 series 8 bit microcontrollers manufactured by Microchip Technology.

230 questions
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How to unit-test a bootloader on PIC18 with TCP/IP stack used?

I am developing a bootloader using the XC8 C compiler 1.12 in MPLAB X 1.60 from Microchip. The target chip is PIC18F87J60. My bootloader does some extra things bootloaders normally don't do. It downloads the app image to flash from a server and…
Jupiter
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Microchip TCP/IP stack PIC18F invalid packet seq/ack numbers

Dear fellow StackOverflowers, Im working on a project to implement something on the PIC18F87J60 on my custom (and tested) board using the TCP/IP stack from Microchip. As a test I wrote some code to setup a connection, maintain it for x seconds and…
Jupiter
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Delay on PIC18F

I'm using a PIC18F14K50 with HiTech ANSI C Compiler and MPLAB v8.43. My PIC code is finally up and running and working, with the exception of the delay function. This is crucial for my application - I need it to be in certain states for a given…
Ozzah
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parsing ip adress string in 4 single bytes

I'm programming on a MCU with C and I need to parse a null-terminated string which contains an IP address into 4 single bytes. I made an example with C++: #include int main() { char *str = "192.168.0.1\0"; while (*str != '\0') …
BETSCH
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PIC C18: Reading bits from a byte

I have a very elementary question. However, what ever I tried, I couldn't successfully implement this. I have a shift register (74LS164) connected to PIC18F2550 with the following hardware configuration: // Data pin #define SCLCD_DATA …
hkBattousai
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from PIC18f4550 to serial in parallel out latch

I searched alot about how to send data from PIC18f4550 to 8-bit serial-in, serial or parallel 74HC595 latch. I need a code example to understand how the operation can be performed. Any help is appreciated.
user1077980
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PIC programming which bits are which in TRIS register

I am trying to understand PIC18 code in a format like TRISB &= 0b11100000. What is the order the individual RB pins appear in? i.e. is this register setting RB0-RB2 as input, or RB5-RB7 as input?
Cheetaiean
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MPLAB gives Low power and device failed to connect error when programming pic18f25q10

I am trying to add a simple led application to a PIC18F25Q10 in another circuit using the Curiosity HPC development board. I am using the MCLR, PGD, PGC and GND pins. Although I set the LVP mode to enable in the CONFIG settings and the program speed…
fthelb
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Gated Timer on PIC18 sets TMR3IF flag to late & with Fosc/4 it doesn't set it anyway

I have already spent several nights debugging gated timer on PIC18F26K80. I use MPLAB v4.15 and XC8 v2.32. I want to run a long period timer, so I chose Timer 3 gated by Timer 4. I've read Microchip's documentation and tried to find answers…
OndraCER552
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Sending TABLAT value to a port gives me the wrong value

I'm trying to write a program on PIC18F4550 where I have data defined in my memory and want to send it to PORTC character by character. I have done so but the values showing on PORTC are not the ones shown in the TABLAT register. For example, in my…
April Crude
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Problem calling in PIC C18, parameters garbled - using pointers to structures perhaps?

I am trying to make a fairly simple call using PICC18. Using the MPLAB simulator I am seeing the arguments, even on entry to the function, being completely garbled. I have the following typedef typedef struct { // t_ax25AddressChar…
Richard Corfield
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How to place variables in the access bank - PIC 18 MPASM linker script

I have a linker script which starts INCLUDE 18f14K50_g.lkr I want my interrupt service variables to go into the ACCESS bank. (My program's so small at the moment the whole lot can, but maybe in future...). So SECTION NAME=VarsModemISR …
Richard Corfield
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How can i approach this program with creating a Boolean variable instead of cycling through branches?

I am programming a PIC1847q processor on the curiosity HPC board. My task is to design a battlestar galactica cyclon visor using the LEDs on the board. My current code does infact create and replicate the Cyclon, but I do not think the logic is…
Max Sorin
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Issue in interfacing SPI e-ink display with PIC 18F46K22

I am using a PIC 18F46K22 in SPI master mode to communicate with a Waveshare 1.54" ePaper Module. The FOSC frequency is 8Mhz internal and SPI configuration is FOSC/4. So when I check the output on logic-analyzer some output bits are differ from…
Naman Shandilya
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What is a normal interrupt latency and context saving time on Microchip C18?

I am using the Microchip C18 compiler and on occurrence of an interrupt I am experiencing a quite long delay before the ISR code starts running. As an experiment, this is in my main function: while(1) { LATAbits.LATA4 = 1; LATAbits.LATA4 =…
AndreKR
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