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669104d841
Setting up a DMA transfer can take longer than sending out a buffer byte by byte if the buffer is small. DMA only shows advantages for large buffers, using it for every transfer will cause a net slowdown. Since we did not come up with a good way to determine the treshold based on the SPI frequency, just use a fixed buffer for now so that DMA can be used without slowing things down overall.
15 lines
477 B
Plaintext
15 lines
477 B
Plaintext
# Copyright (c) 2020 HAW Hamburg
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#
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# This file is subject to the terms and conditions of the GNU Lesser
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# General Public License v2.1. See the file LICENSE in the top level
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# directory for more details.
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config SPI_DMA_THRESHOLD_BYTES
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int "SPI DMA threshold (bytes)"
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depends on MODULE_PERIPH_DMA
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depends on MODULE_PERIPH_SPI
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default 16
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help
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Threshold in bytes under which no SPI DMA transfer will be performed.
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Polling will be used instead.
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