twi interfacing with RTC DS1307

[sunil kumar]

please suggest me some API's to interface nrf51422 with RTC DS1307

[Einar Thorsrud]

I have not found a library that will drop directly into the SDK, but there are several libraries out there that you can look at for inspiration. You will also want to look at the TWI master driver for handling the I2C communication with the DS1307.

If you intend to power the nRF at all times (which is the case for most products), it could be an option to use the internal RTC instead of a external RTC. You would have to handle the complexities of date and time, such as adjusting for months with fewer than 31 days and corrections for leap year in software, but the accuracy will be just as good as using the DS1307 (as it only depends on the 32 kHz crystal).

[sunil kumar]

those are the parameters which i used to call nrf_drv_twi_init():

ret_code_t ret;
	nrf_drv_twi_config_t config;
	config.scl=7;
	config.sda=30;
	config.frequency = NRF_TWI_FREQ_100K;
	config.interrupt_priority=0;
	ret = nrf_drv_twi_init(&instance,&config,NULL,NULL);