rusefi.com

I'd like to see things represented as a state diagram / machine.

After some thought, I should correct myself and say "4-6 interrupt sources".

Maybe I'm confused but the only interrupts you should be dealing with are the teeth and cam events, a timer compare/match to turn on/off injectors and a timer compare/match for firing spark... okay maybe two each for injection and spark since you need to control injection time and dwell. That's 4-6 ...

If you have to fire an interrupt to charge the coil, then fire another to fire the coil, you have at least 13ns spent jumping into the IRQ handlers for one cylinder, and that doesn't include the time spent actually executing the code necessary to handle the interrupts properly. Overlapping processe...

@abecedarian STM has features that include "tail chaining" which is a cool stack thing, so it doesn't push and pull from the stack more than once. The link from Sync is very informative. .... Well, most ARMv7 has that, including the TMS570 chips mentioned elsewhere, so I'm glad you found ...

Also in the logic analyzer capture, what was the sample rate? AKA 24MHz sample clock in the analyzer will add a certain level of +/- tolerance jitter in the measurements. The sample rate of the logic analyzer is 200 MHz. Definitely is not a problem to obtain 0.1 or even 0.01 deg resolution for igni...

The following are my opinions and/or interpretations of things as best I know. With any real-time oriented system, interrupt latency has to be accounted / compensated for. It's worth noting an RTOS itself introduces latency and can exacerbate existing ones. This isn't necessarily a bad thing if the ...

@Sergey89 - yeah, your math looks better than mine. I did say I could be wrong, right?

~168MHz with 160ns latency?
That's like... 1000 cycles?

At 168MHz, 1 cycle is about 6.1 ns, so 160[ns latency] * 6.1 [ns per cycle] = 976 cycles

More interesting, 976 cycles * 6.1ns = 59536ns... almost 6 microseconds.

My math could be wrong though.

*edit- nevermind.

I agree, to an extent, the system should be more event driven, but I find the comparison between this and F1 in the '80s a bit of a stretch. IIRC, many of the ignition systems at the time were magneto based, so there goes a bunch of current ECU requirement out the window. The fairly narrow RPM requi...

If STM32F4 runs an engine, fine. Does that make it "right"?

Some of kb1gtt/Jared's comments do allude that with things as they stand, the chip is getting thin. He also gives good reasons for what considerations the alternatives require before jumping off to something else.

ARM GCC (Linaro) is available for download as an add-on in CCS6 App Center. http://e2e.ti.com/support/microcontrollers/hercules/f/312/p/384089/1356263#1356263 GCC tools are supported in the latest version of HALCoGen (v 4.01.00). When setting up the project, choose the correct "family" of ...

Q#1: what is XDS100? I know it's something about debugging. Is it a software protocol? Is it a hardware chip implementing some protocol? I see 'XDS100 emulation' all over the place. Why emulation - what is emulating what? XDS100 are JTAG emulators. See XDS100 emulator wiki on TI.com In particular, ...

@kb1gtt- the parts I have came from 82 Honda GL500. The VR pickups are stock and the centrifugal advance mechanism was modified to carry the gear/trigger which was purchased separately and required boring the gear and press-fitting it on the shaft with a few tack welds for good measure. I estimate I...

Do you have an extra VR sensor, crank wheel, and ability to spin the crank wheel? AKA how do we run a physical test? Matter of fact.... (this should look familiar to some) cxtrigger (3).jpg It hasn't been installed yet. Could probably come up with some way to secure and spin things, but I don't thi...

The crank VR's on my motorcycle can generate over 380v peak to peak. In retrospect, I should probably think myself lucky since my install will have 6 VR sensors to choose from.... 2 based on camshaft: one for each cylinder reflecting TDC compression (each generates ~14v peak) 2 based on crankshaft: ...

Will it work with voltages from 4mV to 400V... and with single-ended VR?


*edit- Yeah, I sort of pulled those numbers from my arse... but I think it's generally a reasonable question which flipping a battery around can't answer.

IIRC, the MAX9924/5/6/7 trigger on the positive going negative transition. So, if your polarity is reversed, your signals are delayed by 1/2 tooth, which in the case of a 60-1 is 3 degrees, a 36-1 is 5 degrees, and 12-1 would be 15 degrees. Even considering single-ended VR, the same would be true, i...

Hmm... I don't have that problem.
And I think it's fairly easy to see my screen is "magnified" a lot more than yours.

*edit- the screen cap is a dual monitor setup.

That is for the LS0432 board, the first Hercules LP. There is some information regarding using it, in particular how some of the projects require changing certain options in CCS. If you're using the LS1224 board, maybe start here ? And download the dev tools from here : http://www.ti.com/tool/nowecc...

R/C engine control is going to be fun to implement.

Knowing what type of engine and its displacement, and operating RPM range would help.
Is it spark or compression ignition?

And welcome!

klyttle wrote:

abecedarian wrote:IIRC, Xylinx has some FPGA with ADC capabilities, as do some of the others.

You're probably thinking of the Xilinx Virtex line of FPGAs. not sure if any of them are automotive rated though....

I think that was it; didn't check for automotive rating though.

From digikey https://octopart.com/ads7953srhbt-texas+instruments-12195531 it's about $11 for low qty. I'm not crazy about the package, I would prefer to see flying leads for thermal expansion issues. That package can be made to work, but requires a bunch of stuff to make it play nice with thermal e...

ADS7953-Q1 - 12 bit, 16 channel; ADS7252-Q1 - 12 bit, 12 channel
Both pin 'compatible', SAR, 0-5.25v range, external PGA / buffer, SPI, TSSOP-38, 4 GPIO / alarm output / configuration input, -40 to 125C
http://www.ti.com/lit/ds/symlink/ads7956-q1.pdf

IIRC, Xylinx has some FPGA with ADC capabilities, as do some of the others.

If anyone other than I are serious about this, I'll buy 2 TMS670LS12x LaunchPad and send one to Sr. russian, and the other to Jared. Is this still on the table? I'll take a LAUNCHXL2-TMS57012 and make a meaningful attempt to get it up & running :) I would even take two of these just in case I b...

N2HET register list: http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/312/5483.NHET_5F00_REG_5F00_HWAG_5F00_DRAFTONLY.pdf Rough graphical example of N2HET operation for angle determination: http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components...

If anyone other than I are serious about this, I'll buy 2 TMS670LS12x LaunchPad and send one to Sr. russian, and the other to Jared. Is this still on the table? I'll take a LAUNCHXL2-TMS57012 and make a meaningful attempt to get it up & running :) I would even take two of these just in case I b...

Is 40kPa usable minimum pressure? I thought there could be even lower pressure on idle. Tomin Keep in mind these sensors are "absolute": 0 kPa would be an absolute vacuum and ~101.3kPa would be the mean atmospheric pressure at sea level. Similarly, ~202.6kPa would equal approximately 14.7...