I'm not sure how the union works. Can you give me an example? Thanks.

Is it possible to create a variable that has 8 bits (byte?) so that each bit accesses a different SFR register bit? For example, I want to access PORTA bits 0-3 and PORTB bits 0-3. So, if I set the variable to %00010001 RA0 and RB0 would set. I know I could do it with a subroutine by passing a byte ...

Lorenzo,
In the PIC18F4520 pins RC1 and RC2 are also used for capture and compare. In order for these pins to function as I/O port pins the capture/compare module must be disabled by setting the CCPxCON register appropriately. I usually do this in the initialize portion of my program.

Roy

The USB port provides +5v from your PC. I think the easiest method would be to feed that +5v to an input pin connected to a 10K ohm resistor tied to ground. If the USB port is not connected that pin would be "0" so you could disable your USB port logic. If that pin was high (1) that would indicate t...

My PIC and USB guide might help. You can download it from here:
http://www.ktgunsmith.com/other/PIC_and_USB_3-80.pdf

My PIC and USB guide might help. You can download it from here:
http://www.ktgunsmith.com/other/PIC_and_USB_3-80.pdf

Also, be sure the Button library is enabled or the "Button" command will not work.

For most MCU's that use the change on PORTB interrupt you need to reset the interrupt flag and read PORTB within the interrupt routine. The change on PORTB interrupt is triggered by any change on PORTB, positive or negative. You cannot select rising or falling edge triggering for the change on PORTB...

I posted a reply to random numbers here http://www.mikroe.com/forum/viewtopic.php?f=97&t=30624 . Basically I use the MikroProgram Suite to randomize the contents of EEPROM memory, then every time the PIC is powered up I rotate bytes within EEPROM addresses, and bits within EEPROM bytes. It works pre...

I think Sasa72 is right with most of his points. However, Nemweb seems to be a motivated young man, and with enough motivation, anything can be learned. My recommendation is to get some introductory books on the topics; basic electronics, digital electronics, microcontroller basics (available from M...

Claudio, You also need to enable the internal USB Voltage Regulator, this is about the 10th line down in the configuration. Are you using one of the Mikroelektronika development boards? If not, then you will also need a 0.22 uF capacitor connected from pin 18 to ground for the internal USB regulator...

Hello Nemweb, I used to teach computer technology so let me try to help. We use the decimal number system (base 10) which means we have 10 digits, 0 - 9. This also means that each position in a multi-digit number represents a power of 10. For example, the number 2564 can be represented by: (4 x 10^0...

Trevor, Actually, your keypad will also work if you just remove the 10K pull down resistors. This way your rows will be high (1) if a switch is open because of your 100K pull up resistors. Your program needs to make RA0, RA1, and RA2 inputs, RA3, RA4 and RA5 outputs which intially should be set all ...

I too had many problems with getting USB to work. As others have stated here, the configuration must be exactly correct. Also, be sure you have a .22uF capacitor connected from pin 14 to ground to enable the internal USB regulator. Your configuration should look like this: [img] http://www.ktgunsmit...

Here is an example from a project I'm building: '******************************************************************************* ' This procedure allows the user to enter load data into a file on the SD memory ' card. The user enters 3 lines, each line is 20 characters and ends with CR/LF ' characte...