1 -------------------------------------------------------------------------------
2 Dallas DS1307 RTC Clock
3 -------------------------------------------------------------------------------
5 This is a capture of data ouput from a Dallas DS1307 RTC module using:
7 - hwclock -f /dev/rtc1 --systohc && { while true; hwclock -f /dev/rtc1; done }
10 - DS1307 datasheet: http://sparkfun.com/datasheets/Components/DS1307.pdf
16 The logic analyzer used was Open Bench Logic Sniffer (at 200kHz):
19 -------------------------
27 This is what the decoded data should look like:
29 - Setting the date/time:
30 S Wr:0x68 A 0x16 A 0x35 A 0x18 A 0x01 A 0x10 A 0x03 A 0x13 A P
32 - Reading the current date/time:
33 S Wr:0x68 A 0x00 A Sr Rd:0x68 A 0x16 A 0x35 A 0x18 A 0x01 A 0x10 A
36 - The abbreviations used above: S = Start, Wr = Write, A = ACK, P = Stop,
37 Sr = Repeated start, Rd = Read, N = NACK
40 The sigrok command line used was:
42 sigrok-cli --driver=ols:conn=/dev/ttyACM0 -d samplerate=200khz \
43 --samples=24576 -p 0=SCL,1=SDA --triggers SDA=0 -o <filename>