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| GPIO11 for SPI or General Purpose https://www.8devices.com/community/viewtopic.php?f=13&t=1109 |
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| Author: | avrhack [ 25 Mar 2018, 13:22 ] |
| Post subject: | GPIO11 for SPI or General Purpose |
Have been troubleshooting what I thought was a hardware issue on my custom Carambola2 board which uses GPIO11 as one of the SPI CS lines. As usual the solution is simple - GPIO11 is by default fixed as an input for Jumpstart. To use it as an output you need to run "mmio -b 0x18040030 0x00070200" first - that will disable jumpstart and allow GPIO11 for other uses e.g. SPI. Hopefully this will save someone else some time fooling around, googling unsuccessfully etc.! |
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