NAME
ds1307 — 64 x 8, serial, i2c real-time clockSYNOPSIS
device iicdevice iicbus
device ds1307
DESCRIPTION
The ds1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. The ds1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the part operates from the backup supply. Access to ds1307 settings is made with the sysctl(8) interface:dev.ds1307.0.%desc: Maxim DS1307 RTC dev.ds1307.0.%driver: ds1307 dev.ds1307.0.%location: addr=0xd0 dev.ds1307.0.%pnpinfo: name=rtc compat=maxim,ds1307 dev.ds1307.0.%parent: iicbus1 dev.ds1307.0.sqwe: 1 dev.ds1307.0.sqw_freq: 32768 dev.ds1307.0.sqw_out: 0
- dev.ds1307.%d.sqwe
- If set to 1, the SQW pin drives a square-wave of dev.ds1307.%d.sqw_freq frequency. If set to 0, the output level of SQW pin is controlled by dev.ds1307.%d.sqw_out.
- dev.ds1307.%d.sqw_freq
- Select the frequency of the SQW pin when the square-wave output is enabled on dev.ds1307.%d.sqwe. It can be set to 1, 4096, 8192 and 32768.
- dev.ds1307.%d.sqw_out
- Set the output level of the SQW pin when dev.ds1307.%d.sqwe is set to 0.
MIPS, these values are configurable for
ds1307:
- hint.ds1307.%d.at
- The iicbus(4) that the ds1307 is connected to.
- hint.ds1307.%d.addr
- The i2c address of ds1307.
- compatible
- Must always be set to "dallas,ds1307" or "maxim,ds1307".
- reg
- The i2c address of ds1307. The default address for ds1307 is 0xd0.
SEE ALSO
fdt(4), iic(4), iicbus(4), sysctl(8)HISTORY
The ds1307 driver first appeared in FreeBSD 11.0.AUTHORS
The ds1307 driver and this manual page were written by Luiz Otavio O Souza <[email protected]>.| March 7, 2015 | Debian |