Fix EasyDMA max size. #315
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Dirbaio
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EASY_DMA_SIZE changes based on peripheral, but it is always equal for UARTE, SPIx, TWIx, so I've kept a single variable. Data source is nrfx files, like [this one](https://github.com/NordicSemiconductor/nrfx/blob/b5399066bd7f3dc32ee15510d06ef7137bcacf36/mdk/nrf9160_peripherals.h#L150). Fixes nrf-rs#314
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jonas-schievink
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May 11, 2021
| // Limits for Easy DMA - it can only read from data ram | ||
| pub const SRAM_LOWER: usize = 0x2000_0000; | ||
| pub const SRAM_UPPER: usize = 0x3000_0000; | ||
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| #[cfg(any(feature = "51", feature = "52810", feature = "52832"))] | ||
| pub const FORCE_COPY_BUFFER_SIZE: usize = 255; |
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Do we even need this constant if we already have EASY_DMA_SIZE?
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I would say it's not necessarily bad to have a smaller force copy buffer size than the maximum allowed by DMA, because it gives less side effects with too big buffers overflowing memory unintentionally.
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Yeah, stack-allocating a 64kb copy buffer wouldn't be pretty
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EASY_DMA_SIZE changes based on peripheral, but it is always equal for UARTE, SPIx, TWIx, so
I've kept a single variable.
Data source is nrfx files, like this one.
I've added the values for all nrf chips, even currently unsupported ones, because they'll likely be supported soon. Can remove it if that's not wanted.
Fixes #314