Matrix user forums

You are definitely the man :D! Thanks Martin. Actually the flag method you have implemented seems to work better for my specific application, since I can control at what points in the program I want the "ISR" to execute. There are certain times I do not want the interrupt to have any effect, e.g ...

Martin / Ben, thanks for the help.

I have attached the flowcode file. The code I want to execute during the ISR is contained in the "Main_Interrupt" macro. If this can somehow be placed outside the ISR, but executes whenever the switch B0 is pressed, then my problem will be solved. Not commercially ...

I checked the compiler log files and I am getting the following warning messages after the interrupt compile:

Serious Warning: Possible sw stack corruption, function 'FCM_Enter_On_Time' called by more than one asynchronous thread (main/Task, interrupt, interrupt low)
Serious Warning: Possible sw ...

Hi Martin,

The ISR is quite long, so it cannot be switch debounce. I also have a 10K pulldown resistor connected to B0.

Yes, I do have the LCD code as part of the main interrupt. Should I remove it and add it to a macro called by the main interrupt routine?

Thanks
Mervin

Hi,

I've set up the B0 interrupt, run the simulation and when I press the interrupt switch it enters the ISR and thereafter exits as expected. When I download to the PIC and press the push button switch I wired up to B0, it enters the ISR. On exiting the ISR, it seems to re-execute the ISR; I see ...

A question regarding the use of the port interrupt:

B4 to B7 form part of the port interrupt. Does this mean I can use B0 to B3 for other purposes, e.g. use them as outputs?

I want to only use 2 of the 4 B4 to B7 interrupt pins, e.g. assign push button switches to B4 and B5. Do I use a pull-up ...

Sorry, my fault :oops:. I checked the circuit again and the enable pin was incorrectly connected; difficult to notice on a bread board full of wires! Yes, I know it is a bad excuse!

Martin thank you for suggesting the use of the timers as external interrupts. I am going to first try to configure ...

Okay, I've got another problem!!!

I moved the LCD from port B (D4 to D7 connected to B4 to B7, EN to B0 and RS to B1) to port A (D4 to D7 to A0 to A3, RS to A4 and EN to A5) to free up port B, so that I could use the port B interrupts. Now the LCD has stopped working and it used to working ...

Hi,

Does anybody know how to program and I/O pin of one of the ports of the 16F877A to be an interrupt pin, similar to the RB0 interrupt pin. I want to add 2 push button switches, each one triggering a separate macro. I can do it with RB0, but is it possible to program another pin to act as an ...

Guys, thanks for the reply.

I checked the connections and all are correct. SERMODE is connected to Vcc I have changed the settings as suggested by Mantas, but still no luck.

How can I check if the microcontroller is actually initializing SPI mode?

Maybe I should replace the RTC chip.

Thanks Mantas.

I have downloaded code from Sean for the DS1305 RTC [http://www.matrixmultimedia.com/mmforums/viewtopic.php?f=5&t=6854&p=15993&hilit=ds1305#p15993] and modified it a little with code from JohnCrow [http://www.matrixmultimedia.com/mmforums/viewtopic.php?f=29&t=8607&p=46544&hilit ...

Hi Mantas,

Thanks for the response and for providing clarity on SPI.

I noticed there are NVM Enable and NVM disable routines. I am assuming NVM enable drives the line low and NVM disable drives the line high. I can use the NVM line as the CE for the DS1305

Then I can:
Call SPI_Init
then
Call NVM ...

Hi,

I want to use the SPI_Legacy() component macro to program a DS1305 RTC. The chip requires an active high on the chip enable (CE) pin to enable the chip for read or write operations. The issue I have is, SPI_Legacy() is designed around the EB013 board, which has two enable outputs, i.e. NVM and ...

Hi Dazz,

Thanks for the response. I figured out what the problem was; I was using the home edition of Flowcode 5, so when I compiled the code, FC5 did not generate the C code for the I2C component. Okay, I feel like an idiot, because I spent a few hours trying to find out what was causing the ...

Hi,

I connected up a DS1307 RTC to a 16F8ffA as per the following discussion thread:
viewtopic.php?f=29&t=8607&p=46788&hilit=rtc#p46788

I am managing to download the code to the 16F887A and I get the LCD displaying "DS1307 programmed", but when I do a read to obtain the date, I just get zero's ...

Dazz, thanks. I have registered on the Flowcode v5 forum. I will post my previous message there.

Guys,

Sorry if this is posted in the wrong forum. I could not find a link to post a new message under Flowcode 5 forum.

I connected up the DS1307 as per the following discussion:
http://www.matrixmultimedia.com/mmforums/viewtopic.php?f=29&t=8607&p=46788&hilit=rtc#p46788

I am managing to download ...

Hi Acestu,

Thanks for the response. I will search for it.

Mervin

Hi ,

I am to developing a project using the 16F877A connected to a D1307 to provide time and date information. I want to run a routine (to control a couple of stepper motors etc.), which will start at a specific time of day from Monday to Sunday, execute and stop at a specific time. I want to ...

Yes, the jumpers are set to I/O and I am using a PIC16F84A.

I actually managed to figure out what the problem was. I had the osscillator switches set to RC/FAST. When I changed it to RC/SLOW and turned potentiometer to fully anti-clockwise, it solved the problem. Even LB5 is now working!! Should ...

I recently purchased a HP488 verion 3 board. I have managed to program a PIC1684 with a simple test program that sequentially turns on the onboard port A & PORT B LEDs (program part of the Matrix ASM for PICMicro course - tutorial TUTA3.asm), but noticed that the LB5 LED was not turning on while the ...