RFC: Embed our knowledge of VSFR types into the batch reader

[ckuethe]

Following on to #48 , I thought I might do some initial work on simplifying the batch_read_vsfrs() API. As best I can tell, radiacode transports all VSFRs as uint32le on the wire, no matter how many information-bearing bits they contain: a bool takes 32 bits, just like a float.

Conveniently, the SFR_FILE VS tells us which VSFR IDs are defined, and how to interpret them. It is fairly straightforward to parse the output of the commands() function which reads the SFR_FILE to produce a dict of format strings.

I updated batch_read_vsfrs() and its callers to omit the format argument, and just use the lookup dict to figure out what format to use.

As a quick test, the get_alarm_limits() function works correctly, as does the hand-rolled equivalent of energy_calib(): rc.batch_read_vsfrs([ CHN_TO_keV_A0, CHN_TO_keV_A1, CHN_TO_keV_A2])

Thoughs?

PS. here's the trashy script I used to generate the body of the lookup dict...

import iniconfig
import radiacode

cf = iniconfig.IniConfig('', data=radiacode.RadiaCode().commands())

for k in cf.sections:
    v = dict(cf[k].items())
    k = k.removeprefix('RC_').removeprefix('VSFR_')
    c = None
    if v.get('Type', "") == 'float':
        c = 'f'
    else:
        if v.get('Size', False) == '1':
            if v.get('Min', False) == '0' and v.get('Max', False) == '1':
                c = '3x?'
            else:
                c = '3xb' if v.get('Signed', False) == '1' else '3xB'
        elif v.get('Size', False) == '2':
            c = '2xh' if v.get('Signed', False) == '1' else '2xH'
        elif v.get('Size', False) == '4':
            c = 'i' if v.get('Signed', False) == '1' else 'I'

    print(f"\tVSFR.{k}: '{c}',")