On Thu, Aug 7, 2014 at 7:55 AM, Luke Kenneth Casson Leighton lkcl@lkcl.net wrote:
On Wed, Aug 6, 2014 at 6:10 PM, Daniel Iglesias daniel.iglesias@gmail.com wrote:
06/08/14 14:18, Luke Kenneth Casson Leighton wrote:
On Wed, Aug 6, 2014 at 1:19 PM, Miguel Garcia gacuest@gmail.com wrote:
A basic sketch of the block diagram: http://oi57.tinypic.com/16aeffb.jpg
ok great.
so, things that are missing from the diagram:
- digital GPIO IC connects its IRQ-OUT to EINT0-IN on EOMA68
What's the purpose of this IRQ line? After looking at the GPIO IC datasheet I'm assuming it's there so the IC is polled only when the inputs change, is this correct? (i.e., avoiding busy-waiting)
http://www.nxp.com/products/interface_and_connectivity/i2c/i2c_general_purpo...
you _want_ one that has an IRQ. don't use one that doesn't.
...except do try to find one that's a bit less than $0.95 in volume!! http://www.futureelectronics.com/en/technologies/semiconductors/comm-product...