using AI_Config_Fifo_Data to set channel and bank

[scoobydoo]

OK, still working on the 6229 driver - in particular setting up the AI_Config_Fifo_Data register before an AI read.  The spec says the bottom 4 bits are the channel number, then the next two bits are the bank.  I've found no real explanation what a "bank" is.  However after looking at the examples, it appears the bank is simply bits 4 and 5 of the channel number.  There is all this bit shifting to and out those 2 bits, shift them down 4 bits, then later they are shifted back to the left and ored back in.  As best I can tell, one could have simply done a

AI_Config_Fifo_Data |= channel;

Maybe & channel with 0x3f, just to be safe.  Anyway, am I missing something in the DDK code, or have you guys just taken something really simple and make it just a bit more obscure?

Thanks.

[DiegoF]

Hi,

You are correct, the bank ends up being the 2 most significant bits for the channel number.  My guess is that the register fields reflect the hardware implementation. 

Diego.