-
Notifications
You must be signed in to change notification settings - Fork 0
/
dds.py
217 lines (182 loc) · 4.61 KB
/
dds.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
import struct
class BitBangInterface:
def __init__(self, device):
self.device = device
self.last = None
self.buf = bytearray()
def set_bit(self, bit, on):
if on:
if self.last:
value = self.last | (1<<bit)
else:
value = 1<<bit
else:
if self.last:
value = self.last & ~(1<<bit)
else:
value = ~(1<<bit)
self.buf.append(value & 0xff)
self.last = value
# if on :
# self.bitbang.port |=
# else:
# self.bitbang.port &= ~(1<<bit)
def flush(self):
#print self.buf
self.device.write(self.buf)
self.device.flush()
self.buf = bytearray()
class SPIDevice:
def __init__(self, bb, pins, conf = {}):
self.bitbang = bb
self.pins = pins
def set_bit(self, bit, on):
if isinstance(bit, str):
bit = self.pins.get(bit)
if bit == None:
return
self.bitbang.set_bit(bit, on)
def flush(self):
self.bitbang.flush()
def assert_cs(self):
self.set_bit("cs", False)
def negate_cs(self):
self.set_bit("cs", True)
def assert_sclk(self):
self.set_bit("sclk", True)
def negate_sclk(self):
self.set_bit("sclk", False)
def toggle_sclk(self):
self.assert_sclk()
self.negate_sclk()
def assert_reset(self):
self.set_bit("reset", True)
def negate_reset(self):
self.set_bit("reset", False)
def assert_ioupdate(self):
self.set_bit("ioupdate", True)
def negate_ioupdate(self):
self.set_bit("ioupdate", False)
def toggle_ioupdate(self):
self.assert_ioupdate()
self.negate_ioupdate()
def send_bit(self, on):
self.set_bit("sdio", on)
self.toggle_sclk()
def send_byte(self, byte, bits = 8):
mask = 1 << (bits-1)
for i in range(bits):
self.send_bit((byte & mask) != 0)
mask >>= 1
def send_array(self, data, bits):
i = 0
while bits > 0:
byte = data[i]
mask = 1 << 7
while mask > 0 and bits > 0:
self.send_bit((byte & mask) != 0)
bits -= 1
mask >>= 1
i += 1
class AD9859(SPIDevice):
PINS_DEFAULT = { "sdio":0, "cs":2, "sclk":4, "ioupdate":5 }
FCLK_DEFAULT = 400e6
CONFIG_DEFAULT = { "vco_range":1, "refclk_multiplier":10 }
DIVISOR = 65536.0*65536.0
ASF_MAX = 0x3fff
CFR1 = 0x00
CFR2 = 0x01
ASF = 0x02
ARR = 0x03
FTW0 = 0x04
POW0 = 0x05
CFR1_DEF = ( ("unused", 5),
("load_apr", 1),
("osk_enable", 1),
("auto_osk_keying", 1),
("auto_sync", 1),
("software_manual_sync", 1),
("unused", 6),
("unused", 2),
("autoclrphaseaccum", 1),
("enable_sine_out", 1),
("unused", 1),
("clearphaseaccum", 1),
("sdio_input_only", 1),
"lsb_first",
"digital_powerdown",
"unused",
"dac_powerdown",
"clockinput_powerdown",
"external_powerdownmode",
"unused",
"syncout_disable",
"unused" )
CFR2_DEF = ( ("unused", 8),
("unused", 4),
("high_speed_sync_enable", 1),
("hardware_manual_sync_enable", 1),
("crystal_out_pin_active", 1),
("unused", 1),
("refclk_multiplier", 5),
("vco_range", 1),
("charge_pump_current", 2) )
def get_config_reg(self, bitdef):
conf = self.conf
ary = bytearray()
byte = 0
i = 8
for k in bitdef:
s = 1
if not isinstance(k, str):
s = k[1]
k = k[0]
i -= s
#raise if i < 0
v = conf.get(k)
if v:
byte |= v << i
if i == 0:
ary.append(byte)
byte = 0
i = 8
return ary
def __init__(self, bb, conf = {}):
pins = conf.get("pins") or AD9859.PINS_DEFAULT
SPIDevice.__init__(self, bb, pins, conf)
self.conf = conf
self.fclk = conf["fclk"]
def reset(self):
self.negate_cs()
self.negate_ioupdate()
self.negate_sclk()
self.negate_reset()
def setup(self):
self.assert_cs()
cfr1 = self.get_config_reg(AD9859.CFR1_DEF)
cfr2 = self.get_config_reg(AD9859.CFR2_DEF)
self.write_reg(AD9859.CFR1, cfr1, 32)
self.write_reg(AD9859.CFR2, cfr2, 24)
self.negate_cs()
def write_reg(self, reg, data, bits):
self.send_byte(reg, 8)
self.send_array(data, bits)
def setFTW0(self, ftw0):
reg = bytearray(struct.pack('>L', long(ftw0) & 0xffffffffL))
self.write_reg(AD9859.FTW0, reg, 32)
def setASF(self, ampl):
reg = bytearray(struct.pack('>H', long(ampl) & 0x3fff))
self.write_reg(AD9859.ASF, reg, 16)
def set_frequency(self, freq):
self.assert_cs()
self.setFTW0(freq * AD9859.DIVISOR / self.fclk)
self.negate_cs()
def set_amplitude(self, db):
self.assert_cs()
if db > 0:
db = 0
self.setASF(10.0**(db / 20.0) * AD9859.ASF_MAX)
self.negate_cs()
def ioupdate(self):
self.toggle_ioupdate()
self.flush()