I am trying to use mbed to flash firmware onto my SKR V1.3 to get around controlling it using g-code due to personal needs but my firmware does nothing when flahsed. I’ve added custom pin definitions to PinNames.h in the TARGET_LPC13XX folder and after compiling it successfully to a firmware.bin fi…

I haven’t used the bootloader stuff before, and you need to know about the bootloadersize and what start address it will call. The smoothieware bootloader seems to consume the first 16 k of the flash, then the mbed_app.json may look like this: { "target_overrides": { "*": { …

[image] rydb: DigitalOut xEN(P2_1); //Pin 74 of LPC the enable pin is declared but not set, have you tried to set it to 0 or 1? Should enable when set = 0.

Ok this is weird. I tested a bunch of inputs on the xEN pin: EN turns on when set to xEN = 0; xEN = 1; XEN = false; xEN = true; xEN.write(0); and they all result in the xEN pin reading 2.9-3V. However, when I remove the xEN pin declaration: DigitalOut xEN(P2_1); //Pin 74 of LPC It disable…

Hmm, this honestly sounds like it could be a hardware problem, like the IO pin got fried at some point. Does the same thing happen if you use a different pin?

I measured the yDIR and ySTP pins with my multimeter and the yDIR pin reads 2.0V and the ySTP fluctuates rapidly between 2.0V-0V meaning its being properly switched, and the yEN pin is at 0V. However… The y stepper isn’t turning. Its properly connected and I know the stepper works because it spun wh…

Hmm, what’s the logic level of the stepper motor controller that you are interfacing with? 2V may be too low for it to recognize a logic high. Also, since the LPC1768 is a 3.3V device, 2V on an output pin is very suspicious – it should be 3.3V or 0V. Is it possible that there could be a short to …

First of all, try unplugging the LPC1768 from anything connected to it, and check if the voltage is back to normal. You can also use an ohmmeter to measure the resistance between those pins and ground (make sure to turn off the power first!).

The only thing plugged to it are the stepper drivers. the lpc1768 is soldered onto the board and im worried about accidently killing the processor shorting its leads since they’re so tiny, is there a way for me to not do that? In the meantime, ill double the steppers work with marlin to confirm if…

Are you using a custom board that you made?

no im using an SKR V1.3, the schematic is in the question post

Trouble interfacing with LPC1768 with custom pin definitions

Mbed OS Bugs

rydb (ryan d) July 20, 2020, 5:26am 11

how would i check for a short to ground on the pins?

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Trouble interfacing with LPC1768 with custom pin definitions

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