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b7f9d252 AD |
1 | ------------------------------------------------------------------------------- |
2 | Sony E-mount camera/lens | |
3 | ------------------------------------------------------------------------------- | |
4 | ||
5 | These are dumps from a Sony E-mount camera/lens. | |
6 | ||
7 | Details: | |
8 | https://en.wikipedia.org/wiki/Sony_E-mount | |
9 | ||
10 | These were taken using a modified 16mm Meike extension tube that brings out | |
11 | each lens contact to a 10-pin ribbon cable. | |
12 | ||
13 | Pinout of the mount is as follows (these pins are from left to right | |
14 | looking at a lens from the rear): | |
15 | ||
16 | 1: LENS_GND - Lens motor GND | |
17 | ||
18 | 2: LENS_POWER - Lens motor power | |
19 | Can be either 5.0V or unregulated Vbat (7.4V nominal) - This is somehow | |
20 | negotiated between body and lens. | |
21 | ||
22 | 3: LOGIC_GND - Ground for lens logic circuitry | |
23 | ||
24 | 4: BODY_VD_LENS - As-of-yet unknown body->lens signalling | |
25 | In nearly all cases, it is normally high but pulses low at a very low duty | |
26 | cycle at 60 Hz (is it 50 in EU?). | |
27 | ||
28 | 5: LOGIC_VCC - Lens logic power | |
29 | 3.15V. All data lines described below are 3.15V logic high. | |
30 | ||
31 | 6: LENS_CS_BODY - Handshaking line from lens to body | |
32 | Always high when RXD is transferring data, normally low. | |
33 | ||
34 | 7: RXD - Serial data from lens to body | |
35 | Starts at 750 kbaud, usually negotiates up to 1.5 Mbaud during init. | |
36 | 8N1, LSB-first. | |
37 | ||
38 | 8: TXD - Serial data from body to lens | |
39 | Same speeds as above. | |
40 | ||
41 | 9: BODY_CS_LENS - Handshaking line from body to lens | |
42 | Always high when TXD is transferring data. | |
43 | ||
44 | 10: LENS_XDETECT - (weakly) pulled high by the body | |
45 | Grounded to LOGIC_GND by the lens, or sometimes via 680 Ohm resistor | |
46 | (Viltrox EF-NEX II). Used to detect presence of a lens. Body will not | |
47 | output power unless this is grounded. | |
48 | ||
49 | ||
50 | Logic analyzer setup | |
51 | -------------------- | |
52 | ||
53 | The logic analyzer used was an fx2lafw board (at 6MHz): | |
54 | ||
55 | http://www.amazon.com/gp/product/B00ZOC23TK | |
56 | ||
57 | Probe Lens mount | |
58 | ---------------------- | |
59 | 0 BODY_VD_LENS | |
60 | 1 VCC | |
61 | 2 LENS_CS_BODY | |
62 | 3 RXD | |
63 | 4 TXD | |
64 | 5 BODY_CS_LENS | |
65 | ||
66 | ||
67 | Data | |
68 | ---- | |
69 | ||
70 | Protocol (quick summary): | |
71 | ||
72 | Data is only transmitted when a CS line goes high. Only one frame of data is | |
73 | transmitted per high CS period. All frames start with 0xF0, followed by a | |
74 | command ID byte. All frames end with 0x55, this is preceded by a 16-bit | |
75 | checksum of the command ID byte plus all payload bytes. Checksum is least | |
76 | significant byte first. Frames from body to lens are sometimes padded with | |
77 | additional 0x00 bytes beyond 0x55. | |
78 | ||
79 | A CS line can go high without any data being transmitted. This has so far | |
80 | only been seen during a speed change. | |
81 | ||
82 | The protocol appears to assume fixed frame lengths for a given command ID. | |
83 | Occurrences of 0x55 within a frame are NOT escaped. | |
84 | ||
85 | During "idle" operation, a low pulse of BODY_VD_LENS appears to trigger two | |
86 | status response frames from the lens to the body, followed by two frames from | |
87 | body to lens. | |
88 | ||
89 | Summary of hardware used: | |
90 | ||
91 | - Body: Sony ILCE-A6000 | |
92 | - Probe breakout: Meike 16mm macro extension tube with all pins wired out | |
93 | to a ribbon cable | |
94 | - Lenses: | |
95 | - Sony SEL55210 55-210mm zoom lens, initialization captured at both 55mm | |
96 | and 210mm zoom settings | |
97 | - Viltrox EF-NEX II adapter - Canon EF to Sony E mount electronic adapter | |
98 | - Canon EF 50mm/1.8 STM - Used with Viltrox adapter | |
99 | - Canon EF-S 24mm/2.8 STM - Used with Viltrox adapter | |
100 | - Sony SELP1650 16-50mm Power Zoom lens - Initialization only captured at | |
101 | the lens' default power-on focal length due to PZ + retractable lens | |
102 | ||
103 | More details can be found in the dpreview thread at: | |
104 | http://www.dpreview.com/forums/post/56133485 | |
105 |