So while I'm exploring hostmot2 communication interfaces,
I figured I might as well be thorough and try out BSPI (again,
as I looked into it several years ago briefly). In the latest
incarnation, the man page (hostmot2, lcnc 2.19-pre0) says
that a set of functions are exported:
BSPI
The BSPI (Buffered SPI) driver is unusual in that it does not create
any HAL pins. Instead the driver exports a set of functions that can be
used by a sub-driver for the attached hardware. Typically these would
be written in the "comp"
pre-processing language: see http://linux‐
cnc.org/docs/html/hal/comp.html or man halcompile for further details.
See man mesa_7i65 and the source of mesa_7i65.comp for details of a
typical sub-driver. See man hm2_bspi_setup_chan, man
hm2_bspi_write_chan, man hm2_tram_add_bspi_frame, man hm2_allo‐
cate_bspi_tram, man hm2_bspi_set_read_funtion and man
hm2_bspi_set_write_function for the exported functions.
The names of the available channels are printed to standard output dur‐
ing the driver loading process and take the form hm2_<board
name>.<board index>.bspi.<index> For example hm2_5i23.0.bspi.0
So, I have a bitstream loaded with a BSPI channel and get this in my axis load:
...
hm2/hm2_7i90.0: created Buffered SPI function hm2_7i90.0.bspi.0.
...
hm2/hm2_7i90.0: IO Pin 024 (P2-01): Buffered SPI Interface #0, pin /Frame
(Output)
hm2/hm2_7i90.0: IO Pin 025 (P2-03): Buffered SPI Interface #0, pin Serial
Out (Output)
hm2/hm2_7i90.0: IO Pin 026 (P2-05): Buffered SPI Interface #0, pin Clock
(Output)
hm2/hm2_7i90.0: IO Pin 027 (P2-07): Buffered SPI Interface #0, pin Serial
In (Input)
hm2/hm2_7i90.0: IO Pin 028 (P2-09): Buffered SPI Interface #0, pin CS2
(Output)
hm2/hm2_7i90.0: IO Pin 029 (P2-11): Buffered SPI Interface #0, pin CS1
(Output)
hm2/hm2_7i90.0: IO Pin 030 (P2-13): Buffered SPI Interface #0, pin CS0
(Output)
I do not, however, see any of the advertised functions appear in the machine
configuration.
Am I misunderstanding what "exported functions" means? The only functions that
appear
are ones I addf'ed. I've looked at the mesa_7i65.comp example, but I'd like to
see a hal
file that uses mesa_7i65. There doesn't seem to be any such example in the
source tree.
Thanks again.
-- Ralph
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