the ds1307 comes 56 bytes of nvsram.
if remove battery sram dies. 56 bytes survive power off when used
with arduino eeprom. here read , write cares.
if remove battery sram dies. 56 bytes survive power off when used
with arduino eeprom. here read , write cares.
code: [select]
void tiny_rtc_ds1307_24c32::readsrambyte(byte baddress, byte *pbvalue)
{
wire.begintransmission(ds1307_i2c_address);
wire.write(baddress+8);
wire.endtransmission();
uint8_t bret = wire.requestfrom(ds1307_i2c_address, 1);
*pbvalue = wire.read();
}
void tiny_rtc_ds1307_24c32::writesrambyte(byte baddress, byte bvalue)
{
wire.begintransmission(ds1307_i2c_address);
wire.write(baddress+8);
wire.write(bvalue);
wire.endtransmission();
}
thanks sharing. want better understand akis_t has provided, see timekeeper register, table 2 on page 8 of:
http://datasheets.maximintegrated.com/en/ds/ds1307.pdf
http://datasheets.maximintegrated.com/en/ds/ds1307.pdf
Arduino Forum > Using Arduino > Programming Questions > DS1307 RTC programming - 2. Using the 56 nvSRAM bytes
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