Basic Information: Printer Model: Self build MCU / Printerboard: BTT Octopus Pro Host / SBC raspi4 klippy.log klippy.log (2.2 MB) Describe your issue: Hi, I use an mellow SHT36 v3 toolhead pcb which works well but I’m unable to use the accel lis2dw. I get “Invalid lis2dw id (got ff vs 44…

Okay, I’ve received the package. Well, from signal integrity, it really seems fine. So, it is probably a hardware quirk. Yellow is SCK, blue is CS. ▶ Oscilloscope shots (they are crazy small :D) [image] (I got ground from the RGB connector, it was just handy) I will take a look and see if it …

[image] ChiiSama: [image] mykepredko: Can you explain exactly how you made the serial connection between the Raspberry Pi and the SHT36? I’m trying to figure out how you get a serial connection of: With a UTOR (instead of UTOC) board from mellow. It is in principle an usb to rs323 adapter…

[image] mykepredko: you’re using this diagram for the UTOR connection wiring Yes exactly. No idea what they really transmit I trusted their RS232 description. I only connected the raspi via USB to UTOR and the UTOR to the SHT36. The rest like octopus pro and ERCF is connected via usb to the…

[image] nefelim4ag: Klipper is able to distinguish devices and use different SPI rates for them Didn’t know that. Thought one SPI connection with different devices on it need all the same SPI speed. So I limited MAX and lis2dw. The rest like the TMC chips are limited from older problems with …

[image] mykepredko: “fly wires” Thanks good idea!

[image] nefelim4ag: Unfortunately, I’m in NL, and it looks like we will spend a price of the unit, sending it back and forth :frowning: Thats not a problem. Only one direction is needed. Dont need the SHT36 back. I need only one SHT36 and I bought also an EBB36 meanwhile as fallback. The Chan…

FWIW, I have searched my junkyard and found BIGTREETECH ADXL345/S2DW Accelerometer Board for Running Klipper – Biqu Equipment (LIS2DW variant). It is showing the same behavior. I also agree that soldering around the BGA seems less appealing. Maybe something like https://www.aliexpress.com/item/100…

Hmmm… void gpio_peripheral(uint32_t gpio, int func, int pull_up) { padsbank0_hw->io[gpio] = ( PADS_BANK0_GPIO0_IE_BITS | (PADS_BANK0_GPIO0_DRIVE_VALUE_4MA << PADS_BANK0_GPIO0_DRIVE_MSB) | (pull_up > 0 ? PADS_BANK0_GPIO0_PUE_BITS : 0) | (pull_up < 0 ? PADS_BANK0_G…

[image] nefelim4ag: What if we hack a drive strength here to higher values? wouldnt drive strengh be an issue before the 200 MHz too? 4.7k pullups shouldnt mess with any timing, especially on those short traces. If it is a timing issue, what about manually controlling the CS pin using [outpu…

From discord debugging with a logic analyzer, it seems like the SPI mode change and timing cause the issue. So, basically, on the cold start, it errors out because the SCK line goes from default to the required state by SPI mode. ▶ Logic analyzer screenshots The quirk is that MAX31685 works in the …

For my BTT LIS board: The first reading fails, but the second and subsequent readings succeed. This is true for both soft and hard SPI. Speeds like 5M, 4M, 3M, 1M, and 500k have no effect. This is the case for both hard and soft SPI (first fail, subsequent succeed). The ADXL345 on a Pico board wor…

Lis2dw on mellow SHT36 v3 -> Invalid lis2dw id

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Lis2dw on mellow SHT36 v3 -> Invalid lis2dw id

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