Matrix user forums

Using the DAC on the EB013 along with a ECIO28P.

The DAC only uses SCK, SD0 and DAC EN, but not SDI. Can I use the SDI(RB0) as an independent i/o line, or does it get tied up with the SPI Legacy routines?

Thanks David,

I'll stick with 4.3 for now.

I'm running Windows XP with all the updates, in case that helps with your investigation. I have another licence that runs on a Windows 7 machine - v4.5 works fine on that.

Just re-installed 4.3, and it works fine.

Hi John,

It's not a specific flowchart that causes the error. Any flowchart, including examples from Matrix, gives the same error.

Since upgrading to Flowcode v4.5.18.74 from 4.3, I get:

' Error: Access violation at 0x77C472E3 (tried to read from 0x00EC2000), program terminated. ' when I try to Compile to Chip

After launching the linker/assembler... I get a

Return code = -1073741819

Flowcode was unable to assemble the ASM ...

I see that JACQOUT had a similar interrupt priority question http://www.matrixmultimedia.com/mmforums/viewtopic.php?f=24&t=8507&p=25093&hilit=interrupt+priorities#p25093 and there was talk of using intcon3 to control the priority of INT2. I don't know if JACQOUT resolved this, but would that ...

My email notification doesn't seem to work. My account settings have a valid email address, and I am checking the 'Notify me when a reply is posted' box.

What additional code do I need to make TMR2 a high priority interrupt and INT2 a low or lower priority. I assume this code would be put somewhere at the very beginning of the overall program - is that right?

Is this not possible?

I want to be able to externally reset an ECIO40 with a switch. Pin 3 of the ECIO40 is labelled RESET. What voltage and/or circuitry do I need to add?


[the email notification does not seem to work, even though I have entered a valid email address in my profile]

Hi,

The project is a pulse generator with the following layout:

TMR2 is configured to provide a regular timing interrupt, which sets a pulse flag when the next pulse should occur.

The main routine contains switch checking (to set the pulse rate and width) and writing to an LCD.

A pulse routine ...

Thanks Benj,

How do I change the priorities of the interrupts? Do I need to use a C routine? (I'm not familiar with C).

What are the default interrupt priorities on an ECIO40? Can I change their priorities? I'm using Flowcode 4.

TMR0
RB0/INT0
PORT
TMR1
RB1/INT1
RB2/INT2
USBINT
RXINT
TMR2

When I select the PORT interrupt, it indicates that this is PORT B. What are the conditions on PORT B that will cause an ...

That worked a treat!

I only had issues with the LCD if I set '#define %s_DELAY delay_us' down to (10). I'll leave it a (50), and with that setting and taking out the 'Wdt_Delay_Ms(2)' I can position the cursor & write a whole line of 20 characters/numbers in about 5mS.

Cheers

Thanks for the speedy reply Benj. I will try your suggestions later. A couple of questions:

1. Does both 'print number' & 'print string' use the 'send data function', so if I amend

#ifdef _BOOSTC
#define %s_DELAY delay_10us(10)
#endif

in the definitions macro, does that affect writing numbers and ...

I'm trying to write data to the EB005 LCD board within a tight time window of 10mS. The data sheet for the EB005 quotes 'Cursor Shift' & 'Write Data to Ram' execution times as 39uS and 43uS, but I'm finding it takes 2.2mS for a cursor shift and 1.3mS for a write data (for 3 characters, it gets ...

Many thanks Benj.

I didn't realise that the rollover values could be altered from those in the drop-down list.

Cheers

I trying to get a 10mSec (100Hz) interrupt on a ECIO 40. I've tried all the combinations of TMR0/1/2, pre/post scaler, rollover, but cannot a combination that gives an exact 100Hz.

It's easy with the MCU Multiprogrammer EB006, TMR0 set to 300Hz, count 3 loops.

Any suggestions welcome.