On Jul 30, 2007, at 11:51 AM, Charles Krinke wrote:
I'm puzzled about how to setup interrupts for the second I2C interface
in an 8541. This is the CPM interface, the one with buffer
descriptors.
I see mention of its I2CER/I2CMR registers, but am having trouble
figuring out how to enable and interrupt so that when the interface is
in slave mode and a packet is received, it will vector to an interrupt
service routine.
I am using Linux-2.7.17.11 and I know you-all have gone past this a
bit,
but in the midst of a project, we are constrained to finish with the
kernel we started with.
A few pointers on enabling an interrupt from this interface would be
greatly appreciated.
To get interrupts you need to use the BD rings. Look at the section
'I2C Buffer Descriptors' in the 8555 UM and it shows 'I' bits in both
the TX RX rings that should cause interrupts.
- k
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