The PIC18 series 8 bit microcontrollers manufactured by Microchip Technology.
Questions tagged [pic18]
230 questions
2
votes
1 answer
Put the data from a .wav file into the flash memory of pic18F4550
I'm new at hardware programming: I work with the pic18F4550 with the C compiler from microchip version 8.63. My question is: has someone example code to write a .wav file (binary data) to the flash memory of the pic18F4550?
projecten1
- 67
- 9
2
votes
2 answers
PIC18F4550 customize USB VID and PID
I'm new to PIC programming, and I'm ready to make a USB program so that I can send it motor control commands from my program on a (Windows XP) PC.
How do I set the VID and PID for PIC18F4550? I read over the datasheet, but it doesn't seem to say…
lmat - Reinstate Monica
- 7,289
- 6
- 48
- 62
2
votes
1 answer
PIC18f46k42 UART not receiving
The TL;DR first: UART1 receiver isn't receiving; please tell me what I'm doing wrong.
More detailed version:
I'm currently working on a project that uses UART to send status reports between two PIC18f46k42 chips. Previous tests on a prototype board…
Chris
- 31
- 4
2
votes
1 answer
Simple Interrupt program traps/freeze cpu(USART/PIC18F/MICROCHIP/XC8)
I am using the following:
pic18f4550,
xc8 compiler,
mplab x ide v3.20,
a transmitter and receiver module (tested with a main program without any interruptions and works).
LED's connected to RD0,RD1 and RD2 (1 = light up)
Buttons…
Steve Quek
- 21
- 4
2
votes
2 answers
SPI master to PIC18F4550 slave synchronization (C18) using NETMF
A .NET Micro Framework device (ChipworkX in this case) sends a byte through the SPI interface to a PIC18F. Having PIE1bits.SSPIE enabled, the following code is executed on interrrupt:
void high_isr (void)
{
PIE1bits.SSPIE = 0;
…
Joost
- 43
- 4
2
votes
2 answers
Pic to PIc and PC USB how to?
I want to make an application where PIC18F4550 send its internal eeprom data to the pc through usb. Also i want to use the same usb connector to download the data to another PIC18F4550 over usb.
How to use ex_usb_serial.c of ccs examples codes for…
Adnan
- 193
- 3
- 8
2
votes
1 answer
Why doesn't this compile in C18?
I'm trying to compile the following code using the MPLAB C18 v3.36 compiler.
Compiler returns a syntax error on 'char rij;'.
But when i put char rij; a line earlier (before TRISA = ...), it compiles ...
void setup(void)
{
TRISD = 0b00000000;
…
Joost
- 43
- 4
2
votes
3 answers
USART transmit problems on a PIC
I'm trying to send data to an SD card from a PIC18f4580, but the PIC is not sending what it should be.
related global variables:
unsigned char TXBuffer[128]; //tx buffer
unsigned char TXCurrentPos = 0x00; //tracks the next byte to be sent
unsigned…
John Moffitt
- 5,730
- 7
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- 39
2
votes
4 answers
Running code while waiting for code
I know this will sound absurdly simple. But I cannot think of, or adequately define to search for, how to have code in C to have a blinking LED going at a constant frequency while the rest of the program runs. Set and forget sort of thing. I have…
Chris
- 21
- 1
2
votes
1 answer
no chip name specified; use "PICC18 --CHIPINFO"
I did a simple program to light a led.
#define _XTAL_FREQ 19660800
#define USE_AND_MASKS
#include
#include
#include
#include
void main(void) {
TRISA=0;
PORTA=0;
PORTA=0x5A;
while (1)
…
keating
- 23
- 1
- 3
2
votes
1 answer
PIC 18F8722 variable declaration adresses
I know I can declare a variable in that way.
variable udata 0x20
But what is the memory limit for this? Is
variable udata 0x35
a valid instruction? I mean, can I use address 0x35? Is it spared to me, not SFRs? Also, how can calculate space…
mualloc
- 495
- 9
- 24
2
votes
2 answers
Declaring large arrays on PIC18
I'm trying to declare a 512 byte array in MPLAB X v2.26, using compiler XC8 v1.32. My target is a PIC18F66K90 (4k of RAM).
If I declare the array inside any function, main for example, I get an error.
#define buffSize 512
int main (void) {
…
burnorthingham
- 51
- 1
- 7
2
votes
0 answers
PIC18F26J13, SPI2 mapped on PORTB, doesnt work
I am working on a project with a 18f26j13, where i need I2C on MSSP1, and SPI on MSSP2. my I2C works perfectly, but i cant get the SPI to work on port B, if i map them to port c, it works perfectly, so i am thinking that there is something i am not…
Heinrichs
- 21
- 2
2
votes
2 answers
reading pic18 rom constants with C18
I am struggling to understand why I get random data while trying to read from multidimensional table that is stored in rom.
I have a table of bitmap character which I want to display on OLED screen. Table of characters is too big to fit into ram…
user2771538
- 103
- 1
- 10
2
votes
1 answer
How to make timer0 use a prescaler of 1:64 in 16 bit mode?
I really do not have good understanding about timers, but I am trying to change timer0 to make it use a prescaler of 1:64 in 16 bit mode? I got the Timer code from Microchip and it is using 8 Bit mode with no prescaler. Download Files
This is some…
Ammar
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