# Octopus Pro 1.0.1 (H723) and SPI3 **URL:** \ **Category:** General Discussion\ **Created:** [April 6, 2023, 12:43pm UTC](https://klipper.discourse.group/t/octopus-pro-1-0-1-h723-and-spi3/7675 "2023-04-06T12:43:52Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![tafy](https://avatars.discourse-cdn.com/v4/letter/t/67e7ee/32.png) [@tafy](https://klipper.discourse.group/u/tafy)\ **Post date:** [April 6, 2023, 12:43pm UTC](https://klipper.discourse.group/t/octopus-pro-1-0-1-h723-and-spi3/7675/1 "2023-04-06T12:43:52Z")
Hello, I went from a octopus pro with 429 chipset to an octopus pro v1.0.1 with a h723 chipset. My config was transferred without any problem but only for one section. It seems that SPI3 is not available in the firmware for h723, I get the following error " Unknown spi\_bus ‘spi3’ ". Has this been renamed ? all I can see in the firmware file is a reference to spi3a and spi3 is absent. this is the portion of my config causing the issue: [adxl345] cs\_pin: PA15 spi\_bus: spi3 Thanks for your guidance. ---
**Author:** ![dumpster\_monkey](https://avatars.discourse-cdn.com/v4/letter/d/53a042/32.png) [@dumpster\_monkey](https://klipper.discourse.group/u/dumpster_monkey)\ **Post date:** [July 18, 2023, 6:57am UTC](https://klipper.discourse.group/t/octopus-pro-1-0-1-h723-and-spi3/7675/2 "2023-07-18T06:57:48Z")
Not sure if you got this sorted, I had a look at the klipper.dict file for the h723 board and it looks like the spi\_bus you want is spi1a(“BUS\_PINS\_spi1a”:“PB4,PB5,PB3”) . Those pins correspond to the board pins shown on the [btts colour pinout pdf](https://github.com/bigtreetech/BIGTREETECH-OCTOPUS-Pro/blob/master/Hardware/BIGTREETECH-Octopus-Pro-V1.0-Color-PIN-V3.0.pdf) (which also shows PA15 as the CS pin). So definitely not the spi3 that the f4xx pro boards use. So… [adxl345] cs\_pin: PA15 spi\_bus: spi1a ---
**Author:** ![EddyMI3D](https://yyz2.discourse-cdn.com/free1/user_avatar/klipper.discourse.group/eddymi3d/32/1981_2.png) [@EddyMI3D](https://klipper.discourse.group/u/EddyMI3D)\ **Post date:** [May 7, 2024, 5:33am UTC](https://klipper.discourse.group/t/octopus-pro-1-0-1-h723-and-spi3/7675/3 "2024-05-07T05:33:44Z")