suspect-devices/circuitpython/extmod/machine_spi.c, branch 2.xCircuitPython - a Python implementation for teaching coding with microcontrollershttps://git.suspectdevices.com/suspect-devices/circuitpython/atom?h=2.x2017-02-06T03:38:33+00:00extmod/machine_spi: Remove EVENT_POLL_HOOK from soft-SPI transfer func.2017-02-06T03:38:33+00:00Damien Georgedamien.p.george@gmail.com2017-02-06T03:38:33+00:00urn:sha1:dee47949cc8782c2d565de6d6b7e5c1339000061
SPI needs to be fast, and calling the EVENT_POLL_HOOK every byte makes it
unusable for ports that need to do non-trivial work in the EVENT_POLL_HOOK
call. And individual SPI transfers should be short enough in time that
EVENT_POLL_HOOK doesn't need to be called.
If something like this proves to be needed in practice then we will need
to introduce separate event hook macros, one for "slow" loops (eg
select/poll) and one for "fast" loops (eg software I2C, SPI).
extmod/machine_spi: Provide reusable software SPI class.2016-12-08T02:47:01+00:00Damien Georgedamien.p.george@gmail.com2016-12-08T02:47:01+00:00urn:sha1:1eb3c66e9136b5934fc306408f00f11a07dea584
So long as a port defines relevant mp_hal_pin_xxx functions (and delay) it
can make use of this software SPI class without the need for additional
code.
extmod/machine_spi: Add optional support for fast software SPI.2016-10-04T02:46:40+00:00Damien Georgedamien.p.george@gmail.com2016-10-04T02:46:40+00:00urn:sha1:b0eb0d6153d63cf823065792db35d2858fbb9406
If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY then it can use a
faster software SPI loop that does not make calls to the delay_us
function.
extmod/machine_spi: Use delay_half, not baudrate, for internal timing.2016-10-04T02:43:02+00:00Damien Georgedamien.p.george@gmail.com2016-10-04T02:43:02+00:00urn:sha1:b932b2dd1faaf3091b13af7d213041a737e40fac
The delay_half parameter must be specified by the port to set up the
timing of the software SPI. This allows the port to adjust the timing
value to better suit its timing characteristics, as well as provide a
more accurate printing of the baudrate.
extmod/machine_spi: Factor out software SPI code from esp8266 to extmod.2016-10-03T05:43:44+00:00Damien Georgedamien.p.george@gmail.com2016-10-03T05:43:44+00:00urn:sha1:d434ce3fca088959c4a4bf525b9d730ec9bdb7b4extmod/machine_spi: Simplify SPI xfer function to only take one buf len.2016-10-03T01:39:31+00:00Damien Georgedamien.p.george@gmail.com2016-10-03T01:39:31+00:00urn:sha1:5bb28c7f10ebd1036302cf7ac0b24a7a233de2aa
There is no need to take src_len and dest_len arguments. The case of
reading-only with a single output byte (originally src_len=1, dest_len>1)
is now handled by using the output buffer as the input buffer, and using
memset to fill the output byte into this buffer. This simplifies the
implementations of the spi_transfer protocol function.
extmod: Add machine_spi with generic SPI C-protocol and helper methods.2016-09-01T05:07:20+00:00Damien Georgedamien.p.george@gmail.com2016-09-01T05:07:20+00:00urn:sha1:0823c1baf864f2e8fd60e49a5e42a958fd89ff43
The idea is that all ports can use these helper methods and only need to
provide initialisation of the SPI bus, as well as a single transfer
function. The coding pattern follows the stream protocol and helper
methods.