# SPI1 in Arduino fails

**URL:** <https://forum.amebaiot.com/t/spi1-in-arduino-fails/3403>\
**Category:** Peripherals\
**Tags:** rtl8735b\
**Created:** [October 10, 2024, 1:01pm UTC](https://forum.amebaiot.com/t/spi1-in-arduino-fails/3403 "2024-10-10T13:01:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![andf](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@andf](https://forum.amebaiot.com/u/andf)\
**Post date:** [October 10, 2024, 1:01pm UTC](https://forum.amebaiot.com/t/spi1-in-arduino-fails/3403/1 "2024-10-10T13:01:12Z")

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in a custom board with module rtl8735b I cannot seem to configure SPI1 in arduino. Pin mapping looks correct but when running I get:

> [MISC Err]Pin 5[8] is conflicted  
> [MISC Err]It’s configured as GPIO now.  
> [MISC Err]It’s using by peripheral F0000000  
> [SSI Err]PIN a8 cannot be registered.  
> [SSI Err]spi\_format(): SPI 1 init fails.  
> [SSI Err]Please initialize SPI format first!

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<div class="post-metadata">

**Author:** ![andf](https://avatars.discourse-cdn.com/v4/letter/a/58956e/32.png) [@andf](https://forum.amebaiot.com/u/andf)\
**Post date:** [October 10, 2024, 1:59pm UTC](https://forum.amebaiot.com/t/spi1-in-arduino-fails/3403/2 "2024-10-10T13:59:22Z")

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seems solved, was a config issue of SPI always changing SPI1\_SS pin…