Mass storage with nRF51?

[Sensors]

I have a project that requires a bluetooth central to be used to gather data from a HRM service, which shouldn't be too much of an issue. However, it also has to store this, and other local sensor data to some sort of storage device (perhaps microSD or Flash memory).

I want to be able to access this data from a PC or other device, but I'm not sure if the nRF51 or nRF52 has the ability to support a file system and act as a USB mass storage device. Would I need to use an additional part to make this possible? If so, what options do I have?

Thanks

[RK]

You take the micro SD card out and plug it into a USB adaptor and put it in the computer you want to download the data onto. That's how you access it over USB.

I believe FreeRTOS also has a free FAT filesystem which you can use without the actual RTOS, so you just need to write the SPI driver for the MicroSD card which is tedious but not very hard.

Alternatively since you have bluetooth how about just retransmitting the data over bluetooth to the host computer.