nrf52: Implement EasyDMA-based SPI peripheral implemenation #14057
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bergzand
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Type: enhancement
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benpicco
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bergzand
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@benpicco I've modified the code to minimize the number of ifdefs and let the compiler handle removing any resulting dead code. |
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Rebased on top of #14061 (and now waiting on that PR) |
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Rebased! |
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Squashed! |
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Ho, That rebase is not how it should be, give me a second for a next attempt |
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Should be good now, at least the content of the commits now matches their description |
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Thanks for the review @benpicco! |
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Contribution description
This PR splits the common nrf5x SPI peripheral into the old (,and for the nrf52 deprecated peripheral,) nRF51 driver and a new EasyDMA-based driver for the nRF52. The new driver is significantly faster than the old one as the bytes can be send back-to-back without overhead from the CPU.
I decided to split the nrf5x common peripheral driver, it became too much of an ifdef hell to keep them merged.
The peripheral driver requires a GPIO interrupt on the nrf52832 due to errata 58. The proposed driver uses an adapted form of the workaround presented by Nordic. This anomaly also exists on engineering sample A of the nrf52840. I decided not to support that to shave off some additional flash usage and runtime checks. This might be an issue on the nrf52840-pdk boards.
Testing procedure
Compilation should verify that all nrf52 boards have been adapted, the board config requires modification from
NRF_SPI#toNRF_SPIM#. Maybe @MrKevinWeiss can give this a try on the RobotFW tests to verify the runtime behaviour.Issues/PRs references
None