45 lines
1.7 KiB
Text
45 lines
1.7 KiB
Text
\# Author Andy Pugh
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\# Issued under the terms of the GPL v2 License or any later version
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.TH hm2_bspi_set_write_function "3hm2" "2011-05-31" "LinuxCNC Documentation" "Hostmot2"
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.SH NAME
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hm2_bspi_set_write_function \- Register a function to handle the tram write phase
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of a hostmot2 buffered SPI driver.
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.SH SYNTAX
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.HP
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int hm2_bspi_set_write_function(char *name, void *func, void *subdata)
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.SH DESCRIPTION
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\fBhm2_bspi_set_write_function\fR registers a function in an external driver
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to be called every time that the main Hostmot2
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driver calls the generic "prepare_tram_write" functions.
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The names of the available channels are printed with rtapi_print_msg during the
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driver loading process and take the form:
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.RS
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hm2_<board name>.<board index>.bspi.<index>
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.RE
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For example hm2_5i23.0.bspi.0.
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"func" should be a pointer to a function in the sub driver which is to be
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called to process the pins into BSPI write registers prior to the regular TRAM
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write phase. The function must take a single argument, a pointer to an
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individual instance of the internal driver. If defined in comp then the
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function must \fBnot\fP use the FUNCTION() convenience macro, and the argument
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to the function in the definition must \fBalways\fP be (struct state *inst).
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"subdata" is a pointer to the driver instance internal data. In the case of a
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driver written in comp this will always be "inst" in the function call.
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If using comp then the call to this function should be anywhere in the
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EXTRA_SETUP code.
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.SH RETURN VALUE
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Returns 0 on success and -1 on failure.
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.SH SEE ALSO
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\fBhm2_bspi_setup_chan(3hm2)\fR,
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\fBhm2_bspi_read_chan(3hm2)\fR,
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\fBhm2_tram_add_bspi_frame(3hm2)\fR,
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\fBhm2_allocate_bspi_tram(3hm2)\fR,
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src/hal/drivers mesa_7i65.comp in the LinuxCNC source distribution.
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