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TSPEC: New step=1/d syntax to divide logical cylinder by 'd'

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eg. "c=0-81/2:step=1/2" will read sequential cylinders on a 40T drive,
mapping them to logical cylinders 0,2,4,...,80
Refs #150
This commit is contained in:
Keir Fraser 2022-01-11 13:52:42 +00:00
parent 375a40006e
commit d56fe22761
1 changed files with 7 additions and 4 deletions
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11
scripts/greaseweazle/tools/util.py
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@ -71,7 +71,8 @@ class TrackSet:
l = []
for c in ts.cyls:
for h in ts.heads:
pc = c*ts.step + ts.h_off[h]
pc = c//-ts.step if ts.step < 0 else c*ts.step
pc += ts.h_off[h]
ph = 1-h if ts.hswap else h
l.append((pc, ph, c, h))
l.sort()
@ -134,8 +135,8 @@ class TrackSet:
if m is None: raise ValueError()
self.h_off[h] = int(m.group(1))
elif k == 'step':
self.step = int(v)
if self.step <= 0: raise ValueError()
m = re.match('1/(\d)$', v)
self.step = -int(m.group(1)) if m is not None else int(v)
else:
print(k,v)
raise ValueError()
@ -147,7 +148,9 @@ class TrackSet:
x = self.h_off[i]
if x != 0:
s += ':h%d.off=%s%d' % (i, '+' if x >= 0 else '', x)
if self.step != 1: s += ':step=%d' % self.step
if self.step != 1:
s += ':step=' + (('1/%d' % -self.step) if self.step < 0
else ('%d' % self.step))
if self.hswap: s += ':hswap'
return s