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Re: ADC - No init


On Thu, Jan 01, 2009 at 09:01:49AM -0800, Peter Huszar wrote:
> First of all Happy New Year to all of you.
> 
> 
> I have been doing some work with the ADC driver of the LPC2xxx family.
> 
> I might have misunderstood the concept of the DEVTAB, but since it requires
> the entry point of the init() function in the device driver code, I assumed it will be called. 
> 
> I have traced with the debugger, but the init() of the device driver does not seem to 
> be called between cyg_io_lookup() and cyg_io_read() calls from the user code.
> 
> Of course the lookup() functions in the device driver could also be used to do the 
> initialization, but I would like to know if this is the way to do it, or I should look for 
> some trouble elsewhere. Also since the init() function pointed to by DEVTAB is
> responsible for calling the generic device inti function cyg_adc_device_init()
> I assumed it would be called. 
> 
> Please let me know where my thoughts err.

It should be called as part of
packages/io/common/current/src/iosys.c:cyg_io_init()

You might want to enable CYGDBG_IO_INIT so you can see what devices
init function get called. Check the device is even on the list.

     Andrew

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