diff options
| author | Uwe Hermann <uwe@hermann-uwe.de> | 2011-11-24 20:29:44 +0100 |
|---|---|---|
| committer | Uwe Hermann <uwe@hermann-uwe.de> | 2011-11-24 20:29:44 +0100 |
| commit | 709737bde931156a23f8c5b8bfdd8af2c1e165a9 (patch) | |
| tree | 45a5fd01882810fe14155f9744c41e0d3f106e72 | |
| parent | f9eb559c8e87546fee0b672f2f7a5efb9125e17e (diff) | |
| download | sigrok-dumps-709737bde931156a23f8c5b8bfdd8af2c1e165a9.tar.gz sigrok-dumps-709737bde931156a23f8c5b8bfdd8af2c1e165a9.zip | |
rtc_epson_8564je: Fix up and document example.
The sample data was not correct, only reads were contained, but no writes.
Also, document how the decoded I2C data should look like.
| -rw-r--r-- | i2c/rtc_epson_8564je/README | 19 | ||||
| -rw-r--r-- | i2c/rtc_epson_8564je/rtc_epson_8564je.sr | bin | 63546 -> 96839 bytes |
2 files changed, 16 insertions, 3 deletions
diff --git a/i2c/rtc_epson_8564je/README b/i2c/rtc_epson_8564je/README index e87f4de..bebec46 100644 --- a/i2c/rtc_epson_8564je/README +++ b/i2c/rtc_epson_8564je/README @@ -2,7 +2,8 @@ Epson 8564JE I2C RTC ------------------------------------------------------------------------------- -This an example capture of I2C traffic from/to an Epson 8564JE I2C RTC chip. +This an example capture of I2C traffic from/to an Epson 8564JE I2C RTC chip, +which has a slave address of 0x51 (or 0xa2, if the read/write bit is included). Logic analyzer setup @@ -14,7 +15,7 @@ of 1MHz. The logic analyzer probes were connected to the RTC chip like this: Probe RTC chip pin ------------------------ 0 (green) SCL - 6 (blue) SDA + 1 (orange) SDA GND GND @@ -27,8 +28,20 @@ The device talking to the RTC was doing the following in an infinite loop: - Read back the current time from the RTC. +This is what the decoded data should look like: + + - Setting the date/time: + S Wr:0xa2 A 0x02 A 0x54 A 0x03 A 0x04 A 0x22 A 0x02 A 0x11 A 0x11 A P + + - Reading the current date/time: + S Wr:0xa2 A 0x02 A Sr Rd:0xa3 A 0x54 A 0x03 A 0x44 A 0x62 A 0x52 A + 0x51 A 0x11 N P + + - The abbrevations used above: S = Start, Wr = Write, A = ACK, P = Stop, + Sr = Repeated start, Rd = Read, N = NACK + The sigrok command line used was: sigrok-cli -d 0:samplerate=1mhz --samples 8388608 \ - -p '1=SCL,7=SDA,2-6,8' -o rtc_epson_8564je.sr + -p '1=SCL,2=SDA' -o rtc_epson_8564je.sr diff --git a/i2c/rtc_epson_8564je/rtc_epson_8564je.sr b/i2c/rtc_epson_8564je/rtc_epson_8564je.sr Binary files differindex 76f088f..c84bb78 100644 --- a/i2c/rtc_epson_8564je/rtc_epson_8564je.sr +++ b/i2c/rtc_epson_8564je/rtc_epson_8564je.sr |