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The STM32L151 has several SPI busses, and we want to use more than
one, so add a 'bus' parameter to the SPI interfaces. To avoid wasting
time on AVR and CC1111 processors which only use one SPI bus, elide
those parameters from the actual functions by wrapping them with
macros.
Configuring chip select is now all macroized so that each chip can
have its own version, allowing the STM to share the various SPI device
drivers with the cc1111 and avr processors. Note that only the M25
driver has been ported; porting the others is 'trivial', but not
necessary at this point.
Signed-off-by: Keith Packard <keithp@keithp.com>
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I don't know why this is necessary, but the receive buffer gets
'extra' data added somehow.
Signed-off-by: Keith Packard <keithp@keithp.com>
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SPI transactions generally require a read followed by a write, with
the chip select held the whole time. As a result, the SPI bus must be
held across multiple transactions. To make this reliable, the caller
must hold the SPI mutex, instead of the underlying SPI driver.
Signed-off-by: Keith Packard <keithp@keithp.com>
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Adds a few drivers including an LCD driver
Signed-off-by: Keith Packard <keithp@keithp.com>
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