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2006-03-21 by householder_lpc
Dear, How should I use the SPI port on an LPC2200 processor if I want to interface two or more peripherals on it? I thought that every slave peripheral should have a dedicated Chip Select signal, and the one for which CS is low would be allowed to talk/hear. BUT, there is only one SSEL signal per SPI bus on the LPC. Should I use GPIO pins to create a CS for each peripheral? Many thanks in advance.
2006-03-21 by Sean
The SSEL line is the dedicated CS signal per device. The output SSEL line on the uC is just an example, you can use any GPIO for this functionality to control multiple devices, or if you want several then you can use a decoder chip i.e. 2-to-4 or 3-to-8 to conserve on GPIO lines. -- Sean At 05:21 3/21/2006, you wrote:
>Dear, > >How should I use the SPI port on an LPC2200 processor if I want to >interface two or more peripherals on it? > >I thought that every slave peripheral should have a dedicated Chip >Select signal, and the one for which CS is low would be allowed to >talk/hear. > >BUT, there is only one SSEL signal per SPI bus on the LPC. Should I >use GPIO pins to create a CS for each peripheral? > >Many thanks in advance.
2006-03-21 by Sagaert Johan
Hi The SSEL is used when the LPC210x is acting as an SPI slave. you need to drive the chip selects yourself. Johan
----- Original Message -----
From: householder_lpc
To: lpc2000@yahoogroups.com
Sent: Tuesday, March 21, 2006 11:21 AM
Subject: [lpc2000] Interfacing two peripherals on the same SPI port... SSEL function?
Dear,
How should I use the SPI port on an LPC2200 processor if I want to
interface two or more peripherals on it?
I thought that every slave peripheral should have a dedicated Chip
Select signal, and the one for which CS is low would be allowed to
talk/hear.
BUT, there is only one SSEL signal per SPI bus on the LPC. Should I
use GPIO pins to create a CS for each peripheral?
Many thanks in advance.
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