Matrix user forums

Hi, Is there a way to define and use a 32 bit unsigned VAR to count 10ms ticks in TMR0 macro? I looked in the latest BoostC manual and 32 bit unsigned is supported. I am not sure if it is supported in the BoostC version used by Flowcode or if I can even do it, say in a "C" block. I want to use this ...

Hi, It sounds like Timer 2 would be a better solution for me. I am using both 16F886/887 and 18F4620/2620 chips in my project, all running at 20MHz. I eventually want to get the 18F running at 40Mhz. I would like to experiment with this. Can someone provide me with the required code to do it? Since ...

Hi, Thank you for the information. I am having a problem in that tmr0 = 6; does not compile in my project. I have compiled it in your project fine. Any ideas as to why? I even copied your block into my project and it fails to compile. E:\Back Up Items\Step By Step\Flowcode Projects\18F 5 SEQ PAUSE R...

I found web page that describes a way to prelaod a value into the TMR0 counter so that it does not count 0 to 255 but rather from the "preloaded" value to 255. 20MHz, prescale 8 (2441.41Hz) with preload of 6 give me prefect 10ms multiplier when looped, based on their spreadsheet. I want to count tim...

Hello Ben, I have been trying to get TMR0 to work accurately with very little luck. I believe I have traced it to EEPROM READs. I read 15 eeprom addresses with every logic solve of the project. My project has no loops that tie up the program for extended period of time (other than the eeprom read lo...

Hi,

Guess I need to go back to 3rd grade after I get some sleep.

Thank you,

Ron

Hi, I need help, I cannot get the expected results using TMR0 INT. Either I do not understand how it works, or I am not implementing it correctly, or both. Please correct me as I explain what I think I know. I want to count 10ms time periods but need to use 20MHz for now (waiting on 40MHz crystals)....

Hi Guys, I have the TMR0 almost working. I am using the TMR0 to count out a "pause" command. 18F4620 running at 20MHz, prescale of 8 Flowcode tells me I am running at 2441.41 . I thought the formula was 20000 / 8 = 2500 ? 1 / 2500 = .0004, do what Steve suggested and do this INT for 25 times, then s...

Hi Ben, When the VAR that I am using to count "10ms increments" rolls over to zero I need to account for this. I expect the TMR0 INT to trigger anywhere from 1 - 3 times (depending on how much/which logic solves) per scan, I need to read up to 15 non consecutive eeprom addresses on some logic scans....

Hi,

I will be Incrementing a VAR using TMR0, when the VAR reaches 255 and then Increments again will it roll over to zero or do I have to push a 0 into the var1?

Thank you,

Ron

Hi, Thank you Steve and Ben. Quick question..... x2 How long does it take to process Var = (Var + 1) + (return time from the TMR0 routine) to the main application. 40MHz 18F 20MHz 16F At prescalers of 16 (18F) and 8 (16F) I hit the 10ms exactly. I am trying to determine at 400us TMR0 counts how much...

Hi Ben, I appreciate all the help..... Now for more questions regarding TMR0. I looked at the tutorial description and saw that clock speed/ prescaler = Hz, but the math 3,276,800Hz/128 = 25600 (not 25). Why does the 600 go away? I want to run at 40MHz on an 18F and have 10ms counts. How can I achie...

Hi, I want to use TMR0 to count in 10ms increments. It seems to me that when I get to a section of my code I will read the current value in the TMR0_Count_Var and capture it. If my code must wait a minimum of 10ms before continuing and by counting in 10ms increments with TMR0 I may not get the full ...

Hi, Can you tell me what component macros disable Interrupts please. I was trying to go through the "C" code for my program and it looks like writing to eeprom disables INT. I also use I2C, SPI and RS232 in my programs as well. I did not find anything else that disabled the INT in my program. It wou...

Hi Ben, These worked..... i set the component to 9600, I needed BRG16 I Added a "C" block with the following, which worked, I confirmed the baud rate using a serial port monitor. clear_bit(txsta, SYNC); set_bit(txsta, BRGH); set_bit(baudcon, BRG16); spbrg = 42; set_bit(rcsta, SPEN); // turn on seria...

Hello, I have tried to set up the baud rate register/bits with the following in an attempt to over ride the RS232 componenet macro baud rate. Ben had offered me this in a past post (18F4620, 20MHz, SYNC = 0, BRGH = 1, BRG16 = 1, SPBRG = 42, 115K2 Baud Rate). clear_bit(txsta, SYNC); set_bit(txsta, BR...

Hi Ben,

Can these same changes be made to V3?

Thank you,

Ron

Hello, Will Flowcode be supporting CAN that is built on board many of the newer PICs? 18F4680/18F2680 are the version I am looking at using. I want to be able to communicate using an 18F4680 as the master and 18F2680 as slaves. I am using V3 and hope to upgrade someday to V4 of Flowocde. Thank you, ...

Hi, I have written a simple program that reads an eeprom address many times. I need to use 2 different loop vars in order to count high enough. I have a block at the top if the flowchart to init the first loop var (Loop_1 type INT) to it's proper value of -30000. With each loop I INC Loop_1 until I ...

Hi, I want to "define" 8 pins for 18F4620 as both analog and digital in different sections of my program. A variable downloaded on power up via rs232 will determine which logic will be solved for each pin, digital or analog. If a pin is defined by RS232 as digital the analog logic will never solve, ...

Hi,

I changed the program for a 16F887 and it works properly.

So my guess is it is the config bits, any ideas????

Thank you,

Ron

Hello, I had a working program and then could not locate the latest source code, somehow must have deleted it. I went to older back up that should work and RS232 would not connect. So I went back to basics with 2 versions of the same program. 18F4620, 20000000 EXT Program 1 1 -> RA0 LED comes on whe...

Hi Ben, If I have only one RS232 port on my board and a toggle switch tied to input telling me which device is connected to my rs232 port can i have different "C" code in different loops of code that will allow my program to operate a single RS232 at different baud rates. Example: RA3 HIGH means MP3...

Hi, I was wondeirng if I can change the baud rate to different rates in a flowcode project. Example: Flowcode V3 There is am MP3 player that I can control via RS232, it must work at 2400 baud. I have a few RS232 boards that run at 115K2 baud. Can I put the necessary "C" code in the MP3 macro, place ...

Hi,

yes.... Boy, did I mess that one up......

10 bits.... yep...

Good thing these guys believe in the old saying.... Give me the answer I need, not for what I actually asked...

Thanks,

Ron