DIYEFI.org Forum

Starting to do some visualisations. Note that it is 35 C here today. I spent all day pulling wire and bending conduit in a mechanical room. Yuck.

I like though hole stuff better also. I do use quite a few breakout boards for things that don't come in diy type packages.

As far as the fets go it's pretty much 6 of one half a dozen of the other.

I'm also not a fan of the LM1815. viewtopic.php?f=5&t=1531

Just out of curiosity have you used the PropellerGCC yet?

Firmware tasks

The following tasks have to be performed by the processor. The load can be spread out across 8 x 20 MIPS cores and 16 hardware timers.

• Monitor ignition power
• Track statistics and save in EEPROM (more on this later)
• Monitor 2 pulse input channels for engine speed and output shaft speed
• Poll 2 ADC channels via SPI
• Switch 4 digital outputs (3-4, TCC, Relay, OD light)
• Modulate 1 PWM output (governor)
• Communicate via serial (USB)
• Convert raw input values into useful units
• Perform logic decisions and set flags
• Perform table lookups
• Flash SCAN led

Peter wrote:Just out of curiosity have you used the PropellerGCC yet?

Propeller just got WAY more attractive! Cool :-)

Peter wrote:I like though hole stuff better also. I do use quite a few breakout boards for things that don't come in diy type packages.

As far as the fets go it's pretty much 6 of one half a dozen of the other.

I'm also not a fan of the LM1815. viewtopic.php?f=5&t=1531

Just out of curiosity have you used the PropellerGCC yet?

I get much better than short spikes from my twin LM1815s, but it did take some circuit tweaking.

No I haven't used PropellerGCC. To be honest I like the simplicity of SPIN and PASM. I'm more of a Python and assembler guy than C. I was going to mention it though, as it does make the product more attractive to a larger user base.

Fred wrote:

Peter wrote:Just out of curiosity have you used the PropellerGCC yet?

Propeller just got WAY more attractive! Cool

The best part is it has standard C libraries, so it acts more like Linux than just a plain old microprocessor.

http://propgcc.googlecode.com/hg/doc/Library.html

Basic Coding Milestones
(Somewhat in order of precedence)

#1 Boot/Debug

• Dump predefined variables via serial <- basic testing interface
• Reboot microprocessor on demand (trivial)
• Respond via VGA/NTSC terminal to serial commands <- reduces need for a laptop later
• Generate constant data stream when prompted, and stop when prompted <- datalogging framework
• Set/unset flags via serial
• Write fixed and floating point values to variables via serial

#2 Data Acquisition

• Read and dump states of digital inputs: Ignition Power, Park/Neutral, OD Switch
• Read and dump raw values from DAC: Transmission Pressure, Transmission Temp, Throttle Position, [Baro?] (Need an MCP3204 after all)
• Calculate frequency of pulse inputs: Tachometer, Output Shaft Sensor

#3 Output Generation

• Turn OD, SCAN LEDs on and off
• Switch transmission solenoids on and off: Transmission Relay, 3-4 Shift, TCC Lockup
• Generate PWM for Governor Solenoid

#4 Math

• Convert analogue inputs to either fixed or floating point in Metric automotive units via table lookup or scaling
• Convert Tach and OSS frequencies to RPM
• Set/unset flags via value comparison <- for shift mode logic

#5 Logic

• Boolean compare flags to set shift modes
• Write mode-specific values to PWM and digital outputs
• Profit?

The output shaft speed sensor tone ring has 24 teeth.

thebigmacd wrote: #3 Output Generation

• Turn OD, SCAN LEDs on and off
• Switch transmission solenoids on and off: Transmission Relay, 3-4 Shift, TCC Lockup
• Generate PWM for Governor Solenoid

So, how would 1-2-3 shift be controlled then? Is it all taken care by the single PWM for Governor Solenoid?

russian wrote:

thebigmacd wrote: #3 Output Generation

• Turn OD, SCAN LEDs on and off
• Switch transmission solenoids on and off: Transmission Relay, 3-4 Shift, TCC Lockup
• Generate PWM for Governor Solenoid

So, how would 1-2-3 shift be controlled them? Is it all taken care by the single PWM for Governor Solenoid?

Yes sir, it is. It simulates the old mechanical pressure control in non-electronic version of the transmission.