From 09d097506be28360a8d87fe5ebcfd31c422618ab Mon Sep 17 00:00:00 2001
From: Dan White <dan@whiteaudio.com>
Date: Sat, 30 Jun 2012 21:03:18 -0500
Subject: [PATCH] interactive bisect can repeat a guess

---
 python-lib/mpsse-test.py | 29 +++++++++++++++++++----------
 1 file changed, 19 insertions(+), 10 deletions(-)

diff --git a/python-lib/mpsse-test.py b/python-lib/mpsse-test.py
index d292bcb..b61beb2 100755
--- a/python-lib/mpsse-test.py
+++ b/python-lib/mpsse-test.py
@@ -34,7 +34,7 @@ def str2hex(x):
     return ''.join(map(lambda h: '%02x' % ord(h), x))
 
 
-def bisect(fset, limits=[0.0, 1.0], dgmin=None):
+def bisect(fset, limits=[0.0, 1.0], dgmin=None, up='uk', down='dj'):
     """Given a one-input function fset and list of limits, interactively bisect
     the range by sending fset(guess) and asking to go (u)p or (d)own for the
     next step.  Each stepsize is progressively halved and optionally limited to
@@ -53,18 +53,25 @@ def bisect(fset, limits=[0.0, 1.0], dgmin=None):
         guess.append(g)
         fset(g)
 
-        a = raw_input('q, [u,k], [d,j] ? ').lower()
+        a = raw_input('q, a, [%s], [%s] ? ' % (up, down)).lower()
         if a == 'q':
             quit = True
             return guess[2:]
 
-        if a in 'dj':
+        if a in down:
             g = g - dg
-        elif a in 'uk':
+        elif a in up:
             g = g + dg
+        elif a in 'a':
+            #again, keep same guess, do not modify dg
+            continue
         else:
             print 'OOPS, expecting u or d only'
 
+        # limit values
+        g = min(g, xmax)
+        g = max(g, xmin)
+
         dg = dg / 2
         # for ints, step size stops at 1
         if isinstance(xmin, int):
@@ -77,9 +84,9 @@ def bisect(fset, limits=[0.0, 1.0], dgmin=None):
 ##############################################################################
 # Setup FTDI serial ports
 #
-spi0 = usbio.AtoiSPI0(100e3) #port A
+spi0 = usbio.AtoiSPI0(1000e3) #port A
 
-spi1 = usbio.AtoiSPI1(100e3)  #port B
+spi1 = usbio.AtoiSPI1(1000e3)  #port B
 spi1.context.pidle = spi1.context.pstop = 0xf8
 spi1.Stop()
 
@@ -231,10 +238,10 @@ print str2hex(bytes2str(chain.bytes))
 mux.selA = 0
 mux.selB = 0
 for ota in mux.ota:
-    ota.mode = ota.MUX_CMP
+    ota.mode = ota.CAL_CMP
     ota.fast = 1
     ota.gain = 8
-    ota.offset = 0
+    ota.offset = 52
 mux.write()
 
 
@@ -298,10 +305,12 @@ if 0:
 
     n = []
     r = []
-    nbits = 16
+    nbits = 12
     for i in range(2**nbits):
         x = 2**(16-nbits) * i
         dac.set(0, x)
+        dac.set(2, x)
+        dac.set(4, x)
         adc.read() #sham to trigger conversion
         sleep(160e-6) #ensure 160us conversion time delay
         n.append(x)
@@ -310,7 +319,7 @@ if 0:
         if i % 256 == 0:
             print x, v
 
-    if 1:
+    if 0:
         figure()
         plot(n, r)
         xlabel('DAC code')
-- 
2.25.1