5a02fe068b
apa102: use 4-byte buffer to improve speed
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Instead of sending the APA102 data byte by byte, it's more efficient to
send multiple bytes at once (especially when the SPI peripheral uses
DMA). This requires the apa102.Device object to be a pointer receiver to
avoid excessive heap allocations.
This commit also just happens to work around a hardware bug on the
nrf52832:
https://infocenter.nordicsemi.com/index.jsp?topic=%2Ferrata_nRF52832_Rev2%2FERR%2FnRF52832%2FRev2%2Flatest%2Fanomaly_832_58.html&anchor=anomaly_832_58
2021-05-30 22:39:50 +02:00
42a907035b
spi: incorporate change from GH issue feedback
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Signed-off-by: deadprogram <ron@hybridgroup.com >
2020-12-15 06:08:59 +01:00
46c9ba9595
spi: remove machine.SPI and replace with drivers.SPI interface for almost all SPI drivers
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Signed-off-by: deadprogram <ron@hybridgroup.com >
2020-12-15 06:08:59 +01:00
74c9ff4c76
all: changeover to eliminate all direct use of master/slave terminology
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Signed-off-by: deadprogram <ron@hybridgroup.com >
2020-07-30 12:03:09 +02:00
91539d9ef8
apa102: avoid creating garbage
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Avoid creating unnecessary garbage in the following ways:
* Use the Transfer method instead of the Tx method for single byte
transfers.
* Use a statically allocated buffer for the fixed start-of-frame
sequence.
Running this for a few minutes did not cause the garbage collector to
run. Previously, it would run every second or so in a
persistence-of-vision application.
2020-05-26 19:50:31 +02:00
d1b917b835
Support software SPI for APA102 (Itsy Bitsy M0 on-board "Dotstar" LED as example) ( #86 )
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* Added implementation and example to support software-based SPI for APA102, for use with boards like Adafruit Itsy Bitsy M0 for instance.
2019-09-09 12:31:17 +02:00
c09f0a8075
all: switch to using custom domain for all drivers
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Signed-off-by: Ron Evans <ron@hybridgroup.com >
2019-05-29 13:33:50 +02:00
773b01e911
apa102: add support for APA102 SPI controlled LEDs
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Signed-off-by: Ron Evans <ron@hybridgroup.com >
2018-12-22 19:14:02 +01:00
Ayke van Laethem
deadprogram
BCG