kopia lustrzana https://git.code.sf.net/p/tinypythonpanadapter/code
297 wiersze
11 KiB
Python
297 wiersze
11 KiB
Python
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#!/usr/bin/env python
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# Si570control class gives python access to the Si570 Digital
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# Sythesizer via a USB connection.
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# Copyright (C) 2014 Martin Ewing
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Contact the author by e-mail: aa6e@arrl.net
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# This is "middleware" that defines an API for general user programming
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# of radio systems using the Si570 Programmable VCXO as an inexpensive
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# digital VFO. These routines connect via USB to an ATtiny45 USB-to-I2C
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# device, which is running the usbavrsi570 code from PE0FKO.
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# Tested on SoftRock RxTx Ensemble that uses the ATtiny85 MPU chip and a
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# SiLabs 570 ("CAC000141G / D1HOS144") chip
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# [3.3v CMOS, 61 ppm stab., 10-160 MHz]
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# partially based on a subset of operations.c from Andrew Nilsson VK6JBL
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# Also, see http://www.silabs.com/Support%20Documents/TechnicalDocs/si570.pdf
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# and https://code.google.com/p/usbavrsi570/
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# require libusb-1.0 wrapper from https://pypi.python.org/pypi/libusb1/1.2.0
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import libusb1, usb1
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import math, sys
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from sidefs import *
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# flags used for most usb i/o
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#input
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UFLGS1 = libusb1.LIBUSB_TYPE_VENDOR | \
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libusb1.LIBUSB_RECIPIENT_DEVICE | \
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libusb1.LIBUSB_ENDPOINT_IN
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#output
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UFLGS2 = libusb1.LIBUSB_TYPE_VENDOR | \
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libusb1.LIBUSB_RECIPIENT_DEVICE | \
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libusb1.LIBUSB_ENDPOINT_OUT
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# Note changes from operation.c:
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# 1. method names have changed to make them more regular.
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# 2. get/set freq always work with floating MHz of signal frequency =
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# osc frequency / multiplier.
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class Si570control(object):
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def __init__(self, verbose=0, fXtal=114.285, multiplier=4, i2c=0x55,
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vendor_id=0x16c0, product_id=0x05dc):
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self.verbose = verbose
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self.fXtal = fXtal
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self.multiplier = multiplier
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self.i2c = i2c
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self.context = usb1.USBContext()
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self.device = self.context.getByVendorIDAndProductID(vendor_id, product_id)
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if self.verbose:
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print "device", self.device
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self.handle = self.device.open()
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self.version = self.getVersion()
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# get version numbers
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def getVersion(self):
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bb = bytearray(self.handle.controlRead
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(UFLGS1,REQUEST_READ_VERSION, 0x0E00, 0, 2, 500))
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if len(bb)==2:
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ver = "%d.%d" % (bb[1], bb[0])
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if self.verbose:
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print "Version", ver
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return ver
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else:
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if self.verbose:
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print "Version Unknown."
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return None
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def enum_devices(self):
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mydevices = self.context.getDeviceList()
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print "n=",len(mydevices)
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for i,x in enumerate(mydevices):
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print "%2d %2d %d %3d %d %d %0.4x %0.4x" % (i,
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x.getBusNumber(),
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x.getDeviceAddress(),
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x.getDeviceClass(),
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x.getDeviceProtocol(),
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x.getDeviceSpeed(),
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x.getVendorID(),
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x.getProductID() )
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def getFreqByValue(self): # return osc freq / multiplier
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bb = bytearray( self.handle.controlRead
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(UFLGS1, REQUEST_READ_FREQUENCY, 0, 0, 4, 500) )
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fint = ((bb[3] << 8 | bb[2]) << 8 | bb[1] ) << 8 | bb[0]
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if len(bb) == 4:
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ans = (float(fint)/(1<<21)) / self.multiplier
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return ans
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else:
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return None
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def getRegisters(self):
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bb = bytearray( self.handle.controlRead
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(UFLGS1, REQUEST_READ_REGISTERS, SI570_I2C_ADDR, 0, 6, 5000) )
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if len(bb) > 0:
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for i in range(6):
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print "Register %d = %X (%d)" % ( i+7, bb[i], bb[i] )
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def calculateFreq(self, s): # s is string, could be bytearray?
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si = bytearray(s)
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RFREQ_int = ((si[2] & 0xf0) >> 4) + ((si[1] & 0x3f) * 16)
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RFREQ_frac = ((si[2] & 0xf ) << 24) + (si[3] << 16) + (si[4] << 8) + si[5]
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RFREQ = RFREQ_int + (float(RFREQ_frac) / 268435456.0)
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N1 = ((si[1] & 0xc0 ) >> 6) + ((si[0] & 0x1f) << 2)
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HS_DIV = (si[0] & 0xE0) >> 5
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fout = self.fXtal * RFREQ / ((N1 + 1) * HS_DIV_MAP[HS_DIV])
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if self.verbose >= 2:
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print "RFREQ = %f" % RFREQ
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print "N1 = %d" % N1
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print "HS_DIV = %d" % HS_DIV
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print "nHS_DIV = %d" % HS_DIV_MAP[HS_DIV]
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print "fout = %f" % fout
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return fout # actual osc freq.
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def getFreq(self): # return osc freq / multiplier
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strg = self.handle.controlRead \
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(UFLGS1, REQUEST_READ_REGISTERS, SI570_I2C_ADDR, 0, 6, 5000)
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# keep strg for calculateFrequency, avoiding unicode issues.
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bb = bytearray( strg )
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if len(bb) > 0:
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if self.verbose >= 2:
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for i in range(6):
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print "Register %d = %X (%d)" % ( i+7, bb[i], bb[i] )
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return self.calculateFreq(strg) / self.multiplier
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else:
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return None
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def getPTT(self):
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bb = bytearray( self.handle.controlRead
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(UFLGS1, REQUEST_READ_KEYS, 0, 0, 1, 5000) )
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if bb[0] & 0x40:
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return 1
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else:
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return 0
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def getKeys(self):
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bb = bytearray( self.handle.controlRead
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(UFLGS1, REQUEST_READ_KEYS, 0, 0, 1, 5000) )
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if bb[0] & 0x20: # CW_KEY_1 high: not pressed low: pressed
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keys = 0
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else:
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keys = 1
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if not (bb[0] & 0x02):
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keys += 2 # CW_KEY_2 high: not pressed low: pressed
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return keys # keys = 3 if both pressed
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def setPTT(self, value):
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bb = bytearray( self.handle.controlRead
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(UFLGS1, REQUEST_SET_PTT, value, 0, 3, 5000) )
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if self.verbose >= 2:
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print "buffer=",bb[0],bb[1],bb[2]
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def calcDividers(self, f): # Returns solution = [HS_DIV, N1, f0, RFREQ]
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# Instead of solution structure, use simple list for each variable.
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cHS_DIV = list()
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cN1 = list()
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cf0 = list()
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cRFREQ = list()
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for i in range(7,-1,-1): # Count down through the dividers
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if HS_DIV_MAP[i] > 0:
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cHS_DIV.append(i)
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y = (SI570_DCO_HIGH + SI570_DCO_LOW) / (2 * f)
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y = y / HS_DIV_MAP[i]
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if y < 1.5:
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y = 1.0
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else:
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y = 2 * round(y/2.0)
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if y > 128:
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y = 128
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cN1.append( math.trunc(y) - 1 )
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cf0.append( f * y * HS_DIV_MAP[i] )
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else:
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cHS_DIV.append(None) # dummy result
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cN1.append(None) # another dummy
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cf0.append( 1.0E16 )
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imin = -1
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fmin = 1.0E16
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for i in range(8):
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if (cf0[i] >= SI570_DCO_LOW) & (cf0[i] <= SI570_DCO_HIGH) :
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if cf0[i] < fmin:
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fmin = cf0[i]
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imin = i
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if imin >= 0:
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solution = [ cHS_DIV[imin], cN1[imin], cf0[imin], cf0[imin]/self.fXtal ]
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if (self.verbose >= 2):
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print "Solution:"
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print " HS_DIV = %d" % solution[0]
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print " N1 = %d" % solution[1]
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print " f0 = %f" % solution[2]
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print " RFREQ = %f" % solution[3]
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else:
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solution = None # This is the error return
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return solution
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def setLongWord(self, v ): # v = int value; return bytearray(4)
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iv = int(v) # be sure of int type
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b = bytearray(4)
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b[0] = iv & 0xff
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b[1] = ((iv & 0xff00) >> 8) & 0xff
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b[2] = ((iv & 0xff0000) >> 16) & 0xff
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b[3] = ((iv & 0xff000000) >> 24) & 0xff
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return b # NB bytearray, not long word!
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def setFreq(self, frequency):
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f = self.multiplier * frequency
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value = 0x700 + self.i2c
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index = 0
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if self.verbose:
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print "Setting Si570 Frequency by registers to: %f" % f
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sHS_DIV, sN1, sf0, sRFREQ = self.calcDividers(f)
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RFREQ_int = math.trunc(sRFREQ)
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RFREQ_frac= int( round((sRFREQ - RFREQ_int) * 268435456) ) # check int ok
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intbuf = self.setLongWord( RFREQ_int )
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fracbuf = self.setLongWord( RFREQ_frac)
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outbuf = bytearray(6)
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outbuf[5] = fracbuf[0]
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outbuf[4] = fracbuf[1]
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outbuf[3] = fracbuf[2]
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outbuf[2] = fracbuf[3] | ((intbuf[0] & 0xf) << 4)
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outbuf[1] = RFREQ_int / 16 + ((sN1 & 0x3) << 6)
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outbuf[0] = sN1/4 + (sHS_DIV << 5)
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sout = str()
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for x in outbuf:
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sout += chr(x)
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r = self.handle.controlWrite \
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(UFLGS2, REQUEST_SET_FREQ, value, index, sout, 5000)
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if r:
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if self.verbose >= 2:
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print "Set Freq Buffer",
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print "%x %x" % (outbuf[0], outbuf[1])
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else:
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print "Failed writing frequency to device"
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def setFreqByValue(self, frequency):
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f = self.multiplier * frequency
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value = 0x700 + self.i2c
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index = 0
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buf = self.setLongWord(round(f * 2097152.0))
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if self.verbose:
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print "Setting Si570 Frequency by value to: %f" % f
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if self.verbose >= 2:
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print "Set Freq Buffer: %x %x %x %x" % (buf[0], buf[1],
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buf[2], buf[3])
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sout = str()
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for x in buf:
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sout += chr(x)
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r = self.handle.controlWrite \
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(UFLGS2, REQUEST_SET_FREQ_BY_VALUE, value, index, sout, 5000)
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if r:
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if self.verbose >= 2:
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print "Set Freq Buffer: %x %x %x %x" % (buf[0], buf[1],
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buf[2], buf[3])
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else:
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print "Failed setting frequency"
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# End of Si570 class
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if __name__ == "__main__":
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# debug code goes here
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si = Si570control(verbose=0)
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freq = si.getFreqByValue()
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print "freq by value", freq
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#si.getRegisters()
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#f = si.getFreq()
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#print "returned freq", f
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#si.setFreq( 1.8)
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#print "set freq check"
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#si.getFreq()
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print "SET FREQ BY VALUE"
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si.setFreqByValue(7.5)
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print "checking"
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print si.getFreqByValue()
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if False:
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print "Calc. dividers [HS_DIV, N1, f0, RFREQ]"
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a = si.calcDividers(28.0)
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print a
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print "Done."
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