Dear Hector Palacios, > Dear Marek, > > On 07/05/2013 01:37 PM, Marek Vasut wrote: > > Dear Hector Palacios, > > > >> The LRADC virtual channels have an 18 bit field to store the sum of up > >> to 2^5 accumulated samples. The read_raw function however only operates > >> over a single sample (12 bit resolution). > >> In order to use this field for scaling operations, we need it to be the > >> exact resolution value of the LRADC. > > > > How would this work once the accumulation is supported? > > As I see it, when you read a channel the driver should give you the 12-bit > value either of one single sample or of N samples. The hardware will always give you 18 bit value, let's call it A of N accumulated samples, each 12 bit long. N is in range of 1 to 32 . The driver currently supports N = 1. Do I understand it correctly that if we want to support N > 1, we have to do the division of A / N in the driver and therefore we will again report only a 12-bit value to the userland ? If so, Acked-by: Marek Vasut <marex@xxxxxxx> Best regards, Marek Vasut -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
