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-rw-r--r--i2c/rtc_dallas_ds1307/README44
-rw-r--r--i2c/rtc_dallas_ds1307/rtc_ds1307_200khz.srbin0 -> 620 bytes
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diff --git a/i2c/rtc_dallas_ds1307/README b/i2c/rtc_dallas_ds1307/README
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+-------------------------------------------------------------------------------
+Dallas DS1307 RTC Clock
+-------------------------------------------------------------------------------
+
+This is a capture of data ouput from a Dallas DS1307 RTC module using:
+
+ - hwclock -f /dev/rtc1 --systohc && { while true; hwclock -f /dev/rtc1; done }
+
+Details:
+ - DS1307 datasheet: http://sparkfun.com/datasheets/Components/DS1307.pdf
+
+
+Logic analyzer setup
+--------------------
+
+The logic analyzer used was Open Bench Logic Sniffer (at 20kHz):
+
+ Probe DS1307 pin
+ -------------------------
+ 0 SCL
+ 1 SDA
+
+
+Data
+----
+
+This is what the decoded data should look like:
+
+ - Setting the date/time:
+ S Wr:0x68 A 0x16 A 0x35 A 0x18 A 0x01 A 0x10 A 0x03 A 0x13 A P
+
+ - Reading the current date/time:
+ S Wr:0x68 A 0x00 A Sr Rd:0x68 A 0x16 A 0x35 A 0x18 A 0x01 A 0x10 A
+ 0x03 A 0x13 N P
+
+ - The abbreviations 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 --driver=ols:conn=/dev/ttyACM0 -d samplerate=200khz \
+ --samples=24576 -p 0=SCL,1=SDA --triggers SDA=0 -o <filename>
+
diff --git a/i2c/rtc_dallas_ds1307/rtc_ds1307_200khz.sr b/i2c/rtc_dallas_ds1307/rtc_ds1307_200khz.sr
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index 0000000..9d8f21f
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+++ b/i2c/rtc_dallas_ds1307/rtc_ds1307_200khz.sr
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