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Signed-off-by: Keith Packard <keithp@keithp.com>
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There are just too many limitations in when interrupts are delivered
to make them useful. Instead, just drive the SPI directly with the
CPU. At higher spi speeds (6Mhz or more), it's probably faster to do
it this way anyways.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This improves performance for SPI transfers, while allowing other
tasks to get work done during longer SPI transfers.
Signed-off-by: Keith Packard <keithp@keithp.com>
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This matches STM
Signed-off-by: Keith Packard <keithp@keithp.com>
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Unused varibles, functions and parameters.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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Wasn't doing the reset sequence correctly (write 0, then write 1).
Signed-off-by: Keith Packard <keithp@keithp.com>
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Was setting configuration for PIO1_21 instead of PIO0_21.
Signed-off-by: Keith Packard <keithp@keithp.com>
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SPI SCLK0 can appear on three different pins; let the application
configure which one it wants.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Might be able to turn it off with some care; more experimentation required.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Check for both fifo status *and* device busy to make sure the device
is idle before we touch any registers.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Signed-off-by: Keith Packard <keithp@keithp.com>
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