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Commit | Line | Data |
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1 | ------------------------------------------------------------------------------- | |
2 | Epson RTC-8564 JE/NB | |
3 | ------------------------------------------------------------------------------- | |
4 | ||
5 | This is an example capture of I2C traffic from/to an Epson RTC-8564 JE/NB | |
6 | I2C RTC chip, which has a slave address of 0x51 (or 0xa2, if the read/write | |
7 | bit is included). | |
8 | ||
9 | ||
10 | Logic analyzer setup | |
11 | -------------------- | |
12 | ||
13 | The logic analyzer used was a ChronoVu LA8 (at 1MHz): | |
14 | ||
15 | Probe RTC chip pin | |
16 | ------------------------ | |
17 | 0 (green) SCL | |
18 | 1 (orange) SDA | |
19 | ||
20 | ||
21 | Data | |
22 | ---- | |
23 | ||
24 | The device talking to the RTC was doing the following in an infinite loop: | |
25 | ||
26 | - Set the RTC to a specific date/time (Nov 22, 2011 - 04:03:54, weekday = 2). | |
27 | ||
28 | - Read back the current time from the RTC. | |
29 | ||
30 | This is what the decoded data should look like: | |
31 | ||
32 | - Setting the date/time: | |
33 | S Wr:0xa2 A 0x02 A 0x54 A 0x03 A 0x04 A 0x22 A 0x02 A 0x11 A 0x11 A P | |
34 | ||
35 | - Reading the current date/time: | |
36 | S Wr:0xa2 A 0x02 A Sr Rd:0xa3 A 0x54 A 0x03 A 0x44 A 0x62 A 0x52 A | |
37 | 0x51 A 0x11 N P | |
38 | ||
39 | - The abbreviations used above: S = Start, Wr = Write, A = ACK, P = Stop, | |
40 | Sr = Repeated start, Rd = Read, N = NACK | |
41 | ||
42 | The sigrok command line used was: | |
43 | ||
44 | sigrok-cli -d 0:samplerate=1mhz --samples 8388608 \ | |
45 | -p '1=SCL,2=SDA' -o rtc_epson_8564je.sr | |
46 |