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Discussion Groups | LPC2000 | LPC2129 SPI Concerns
Discussion group dedicated to the Philips LPC2000 family of ARM MCUs
LPC2129 SPI Concerns - Robert Genders - Aug 28 8:59:13 2008
Hi,
Sorry for the previous post.. Hopefully this sorts out the issue.
I'm trying to implement the SPI interface to communicate with a CS8406 and =
a CS8416 audio chip. The idea is to send serial data to the chip to be enco=
ded as AES audio.
The serial interface is a 3-pin I2S audio connection which acts in a simila=
r manner to SPI, with the chips acting as masters and the 2129 as a slave. =
I'm hoping I can fudge them together, however the data length of the AES ch=
ip is only configurable as 16, 20 or=A024 bit. From looking at the LPC2129 =
user manual, it appears that it can only be configured as 8-bit data length=
. Is this the case?=A0
I'm working well above my required data rate so if the SPI on the 2129 can =
be used with 16 received clock edges and only 8 data bits transmitted from =
the 2129, then it would be an option for me. The other option I've consider=
ed is to run the GPIO as controlling and clock lines, but I can't seem to g=
et the required oscillation frequency (in the order of MHz, ~1-4MHz). I'd r=
ather not approach this method as I'm not sure I can rely on the produced c=
lock (and also whether its feasibly possible).=20
Any feedback, in particular on the data length of the SPI interface, would =
be welcomed.
Regards,
=A0
Rob
=20=20=20=20=20=20
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )
Sorry for the previous post.. Hopefully this sorts out the issue.
I'm trying to implement the SPI interface to communicate with a CS8406 and =
a CS8416 audio chip. The idea is to send serial data to the chip to be enco=
ded as AES audio.
The serial interface is a 3-pin I2S audio connection which acts in a simila=
r manner to SPI, with the chips acting as masters and the 2129 as a slave. =
I'm hoping I can fudge them together, however the data length of the AES ch=
ip is only configurable as 16, 20 or=A024 bit. From looking at the LPC2129 =
user manual, it appears that it can only be configured as 8-bit data length=
. Is this the case?=A0
I'm working well above my required data rate so if the SPI on the 2129 can =
be used with 16 received clock edges and only 8 data bits transmitted from =
the 2129, then it would be an option for me. The other option I've consider=
ed is to run the GPIO as controlling and clock lines, but I can't seem to g=
et the required oscillation frequency (in the order of MHz, ~1-4MHz). I'd r=
ather not approach this method as I'm not sure I can rely on the produced c=
lock (and also whether its feasibly possible).=20
Any feedback, in particular on the data length of the SPI interface, would =
be welcomed.
Regards,
=A0
Rob
=20=20=20=20=20=20
------------------------------------
(You need to be a member of lpc2000 -- send a blank email to lpc2000-subscribe@yahoogroups.com )