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).
Thank you thats working a bit but after first transmission rest ones are not working, in file nrf_drv_twi.c, in function twi_transfer there is a variable is_busy, which remains false after 1st transmission, which is in turn avoiding further communication can i reset it or there is some other procedure?
Thank you thats working a bit but after first transmission rest ones are not working, in file nrf_drv_twi.c, in function twi_transfer there is a variable is_busy, which remains false after 1st transmission, which is in turn avoiding further communication can i reset it or there is some other procedure?
