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I try to communicate with the MCP3202 A/D converter. This converter from
Microchip has an SPI interface and, according to the documentation, at the
begginning of communication I've to send 4 bits to the A/D in order to select
the input analog channel, set the bit-ordering mode, etc. After sending these 4
bits, subsequential 13 clock cycles will output a null bit and the 12 bits of
the converted value.
So, using the "write" function is not an option because as far as I know this
function sends only a byte at a time, and I must write only 4 bits to the chip,
not an entire byte. Is there any way to do so with libmpsse? or I've to modify
it?
For the sake of reference, this A/D chip is part of a DLP-2232DAQ board. I've
managed yet to communicate with the I/O ports included there thanks your great
libmpsse, so thank you for your work!
Original issue reported on code.google.com by masores...@gmail.com on 5 Mar 2013 at 3:21
The text was updated successfully, but these errors were encountered:
Currently libmpsse only supports sending 8-bit bytes, although adding support
for arbitrary bit-length transfers shouldn't be hard since the FTDI chips do
support that. I'll put it on the todo list, but in the meantime yes, you will
either need to modify libmpsse, or bitbang the data using libmpsse's bitbang
mode.
Original comment by heffne...@gmail.com on 11 Mar 2013 at 2:14
I've checked in some patches to the trunk that now include WriteBits and
ReadBits functions. Initial testing seems OK, but I need to test them on a real
device.
Original comment by heffne...@gmail.com on 22 Mar 2013 at 7:07
The latest code from the trunk contains two new functions: ReadBits and
WriteBits, which allow you to read and write from 1 to 8 bits at a time. They
can be safely mixed with the Read and Write functions in your code. I have
tested this at different bit widths in SPI0 mode reading and writing data MSB
first.
Original comment by heffne...@gmail.com on 25 Mar 2013 at 3:00
Original issue reported on code.google.com by
masores...@gmail.com
on 5 Mar 2013 at 3:21The text was updated successfully, but these errors were encountered: