Microsquirt V2 no serial communication

[jsmcortina]

"Fuel pump always on" doesn't sound good.
Possible reasons I can think of:
-Bootload wire shorted to ground?
-Serial cable doing something weird and putting processor into bootload mode?
-Firmware corrupted
-Chip blank
-Hardware fault

Have you tried the serial "loopback test" to check that your cable is operating? It's in the back of the Megasquirt-2 Setting Up Manual.

James

[turbosj413]

"Fuel pump always on" doesn't sound good.
Possible reasons I can think of:
-Bootload wire shorted to ground?
-Serial cable doing something weird and putting processor into bootload mode?
-Firmware corrupted
-Chip blank
-Hardware fault

Have you tried the serial "loopback test" to check that your cable is operating? It's in the back of the Megasquirt-2 Setting Up Manual.

James

bootloader wire is going to ground.. is this not how to go into bootloader mode? .. Ive done the loopback test on the cable and it works no problem

[jsmcortina]

Sounds like it could be an internal fault then.

However, I did have one USB-serial cable that wasn't RS232 compliant. It would pass loopback, but wouldn't talk to the Microsquirt.

James

[racingmini_mtl]

However, I did have one USB-serial cable that wasn't RS232 compliant. It would pass loopback, but wouldn't talk to the Microsquirt.

The cheap chinese USB-serial adapters based on the CH340 chipset will not work with the Microsquirt. There might be other problematic adapters but these ones definitely need to be avoided. By the way, they work fine with a V3.0 board so the issue is a hardware compatibility with the Microsquirt RS232 circuit (verified with an oscilloscope).

Jean

[jsmcortina]

However, I did have one USB-serial cable that wasn't RS232 compliant. It would pass loopback, but wouldn't talk to the Microsquirt.

The cheap chinese USB-serial adapters based on the CH340 chipset will not work with the Microsquirt. There might be other problematic adapters but these ones definitely need to be avoided. By the way, they work fine with a V3.0 board so the issue is a hardware compatibility with the Microsquirt RS232 circuit (verified with an oscilloscope).

Agreed. The CH340 is not RS232. If under warranty return it as not fit for purpose. It is 0-5V only instead of +/-7V minimum.

James

[turbosj413]

either way i get the same outcome with direct serial connection .. im trying to flash new firmware using a different program and still no success.. this is a bit beyond my limited computer skill level

[turbosj413]

still no luck... tried a few more different computers/cables ect.. thinking about ordering a new v3 and tossing this one on the shelf

[rickb794]

Any chance a battery charger or some other noisy poor power source was involved?
Or worse yet a Wall Wart that put out AC?

[turbosj413]

Any chance a battery charger or some other noisy poor power source was involved?
Or worse yet a Wall Wart that put out AC?

as long as ive had it its seen nothing but a good 12v battery .. never know what the previous owner did to it...

[rickb794]

Ouch!