From: Dan White <dan@whiteaudio.com>
Date: Tue, 17 Apr 2012 19:30:24 +0000 (-0500)
Subject: dac is SPI1 mode
X-Git-Tag: calibrations~107
X-Git-Url: http://git.whiteaudio.com/gitweb/?a=commitdiff_plain;h=174c212fbe4bf327c9edb4b5a42dc27fd1a662eb;p=430.git

dac is SPI1 mode
---

diff --git a/python-lib/mpsse-test.py b/python-lib/mpsse-test.py
index 953c4ab..0e33bf9 100644
--- a/python-lib/mpsse-test.py
+++ b/python-lib/mpsse-test.py
@@ -3,6 +3,7 @@
 import time
 import struct
 
+from myhdl import intbv
 from myhdl import bin as b
 
 import mpsse
@@ -13,7 +14,7 @@ import usbio
 class AtoiSPI0(mpsse.MPSSE):
     def __init__(self, freq):
         super(AtoiSPI0, self).__init__()
-        self.Open(0x0403, 0x6011, mpsse.SPI0, int(freq),
+        self.Open(0x0403, 0x6011, mpsse.SPI1, int(freq),
                 interface=mpsse.IFACE_A)
         self.SetCS('flash')
 
@@ -24,13 +25,13 @@ class AtoiSPI0(mpsse.MPSSE):
             self.context.pstart = 0x00
         elif name == 'dac':
             self.context.pidle = self.context.pstop = 0x08
-            self.context.pstart = 0x10
+            self.context.pstart = 0x18
         elif name == 'adc':
             self.context.pidle = self.context.pstop = 0x08
-            self.context.pstart = 0x20
+            self.context.pstart = 0x28
         elif name == 'convst':
             self.context.pidle = self.context.pstop = 0x08
-            self.context.pstart = 0x30
+            self.context.pstart = 0x38
         else:
             raise Exception, 'Unknown CS name: %s' % name
 
@@ -77,7 +78,31 @@ class AtoiI2C(mpsse.MPSSE):
         return r
 
 
-spi = AtoiSPI0(1e5)
+
+def int2str(value, width):
+    if (width % 8) != 0:
+        raise Exception, 'width must be multiple of 8'
+    v = intbv(value, max=2**width)
+    b = [v[i:i-8] for i in range(width, 0, -8)]
+    return ''.join(map(chr, b))
+
+
+
+
+def dacval(value):
+    v = intbv(0)[32:]
+    v[28:24] = 0x3
+    v[24:20] = 0xf
+    v += (value << 4)
+    return int2str(v, 32)
+
+
+def w(v):
+    spi.Start()
+    spi.Write(v)
+    spi.Stop()
+
+spi = AtoiSPI0(1e4)
 spi.SetLoopback(0)
 
 
@@ -89,3 +114,21 @@ vatoi = usbio.AD524x(i2c, 2)
 v430 = usbio.AD524x(i2c, 3)
 
 
+
+
+#turn on internal reference always
+spi.SetCS('dac')
+
+int_ref_always_on = intbv(0)[32:]
+int_ref_always_on[27] = 1
+int_ref_always_on[24] = 1
+int_ref_always_on[19] = 1
+int_ref_always_on[13] = 1
+w(int2str(int_ref_always_on, 32))
+
+all_dacs_on = intbv(0)[32:]
+all_dacs_on[26] = 1
+all_dacs_on[8:] = 0xff
+w(int2str(all_dacs_on, 32))
+
+w(dacval(2**15))
diff --git a/python-lib/usbio.py b/python-lib/usbio.py
index 283a698..235d297 100644
--- a/python-lib/usbio.py
+++ b/python-lib/usbio.py
@@ -505,6 +505,35 @@ class AD524x(object):
 
 
 
+class DAC_Channel(object):
+    def __init__(self, defaults):
+        self._value = defaults['value']
+
+    @property
+    def value(self):
+        return self._value
+
+class DAC8568(object):
+    CTL_WIDTH = 32
+    DAC_WIDTH = 16
+    POR_VALUE = 2**(DAC_WIDTH - 1)
+
+    def __init__(self, spibus, cs='dac'):
+        self.bus = spibus
+        self.cs = 'dac'
+        self._word = intbv(0)[self.CTL_WIDTH:]
+    
+    @property
+    def bytes(self):
+        """Return the control data as a byte sequence in MSB..LSB order."""
+        w = self.word
+        b = [w[i:i-8] for i in range(self.CTL_WIDTH, 0, -8)]
+        return tuple(b)
+
+    def send(self):
+        self.bus.SetCS('dac')
+        
+
 class I2C(object):
     def write(self, data):
         """Send i2c command data to slave."""