There are interfaces in corr for talking to katadcs and iadcs. I'll soon be adding SFP+ (for ROACH-2 mezzanine cards) and KAT's new 10-bit 1.8GSa/s ADC.
You'll probably want to dig through the datasheets of each ADC to better understand what these do. There're a couple of paragraphs explaining how to use these interfaces here: https://casper.berkeley.edu/wiki/Corr If you want to understand the register mapping, you should probably dig through corr's source code. I don't know of any other CASPER documentation. I tried to add comments like this: #register 0x00: # 0-1: standby modes # 2 Chip version test bit. Not implemented on A/B versions (C only). Ignore. # 3 Demux mode (0= 1:1; 1=1:2) # 4-5 Analogue input select (11 = indep, 10= input I, 00 = input Q) # 6-7 Clk select (10 = clkI to both, 00 = clkI to I and clkIn to Q) # 8 Decimation # 9 Always zero # 10-11 Calibration (01 = keep last value, 00=zero gain and DC offset, 11 = perform new calibration) # 12-13 Control wait bit calibration (11 for >500MSps, 10 for 250-500MSps, 01 for 125-250MSps, 00 for <125Msps) # 14 DMUX (0=Fs/4, 1=Fs/2) # 15 NA Jason On 30 Aug 2012, at 23:18, Gopal Narayanan wrote: > Hello Casperites, > > I read with interest Hong Chen's memo on the external adjustment of the > iADC board at: > > https://casper.berkeley.edu/wiki/External_Adjustment_for_the_Atmel_iADC > > I am most interested in the ability to control, calibrate and compensate > the ADC board with controlling the iadc_controller device file. Is there > documentation in the following aspects of the CASPER ecosystem, > specifically for ADC boards. I would appreciate pointers on finding > either code segments or real documentation on these: > > * Aspects of the iADC board registers. How to activate these > registers? You seem to be reading 128 bytes each time you read from the > file system handle 'iadc_controller'. Where are the docs for these? > * Are there equivalent instructions for other ADC boards like KatADC? > * How exactly do devices like iadc_controller get created? Pointers > to where in the source code to look at would be great! > * I would appreciate general pointers as to where the file system > handles for things seen in listdev() are created? For eg. > sys_clkcounter, etc.? > > Thanks in anticipation for your help! > > Gopal > > -- > Gopal Narayanan Ph #: (413) 545 0925 > Department of Astronomy e-mail: [email protected] > University of Massachusetts Amherst MA 01003 >
