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NXP Employee
NXP Employee
Content originally posted in LPCWare by IanB on Sat Feb 13 10:20:31 MST 2016
I have an application where the ADC is set to runs continuously. It reads 6 channels, 10 bits per channel, with a division ratio of 56. With a 48MHz clock the sequence repeats 13000 times a second.
The interrupt is triggered by the end of the conversion on AD7, and the routine reads all the data registers (not the global data register - I have read the errata)

Although the data seem correct, every channel has bit 30 set indicating an overrun.

I even reduced the interrupt service routine so that it did no more than read the data registers and toggle a GPIO port.
I could see on the 'scope that it was running 13000 times a second, but it still indicated overruns on each channel.

Should I just ignore bit 30? Or has there really been an overrun?
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