It is a total custom implementation, I'm not sure if Nordic think it is useful for general purpose and have an official support.
I think it is no problem for nRF51/52 work as a card to interact with interface device (card reader). However, if use nRF51/52 as a general card reader, there are some electrical specification issues, for example, ISO/IEC 7816 requires the current supply is up to 50mA, this can not be provided by GPIO of nRF51/52. Although with our implementation, nRF51/52 are working perfectly as a SIM/USIM card reader, but I have no idea if use nRF 51/52 as a general card reader.
About our progress, it is no problem to let the 2 stacks (Softdevide and ISO7816) work "together" as TDM manner, it is working in our implementation. Since at any time, there is only 1 stack running. We are trying to make 2 stacks work concurrently by using timeslot feature of Softdevice.
It is a total custom implementation, I'm not sure if Nordic think it is useful for general purpose and have an official support.
I think it is no problem for nRF51/52 work as a card to interact with interface device (card reader). However, if use nRF51/52 as a general card reader, there are some electrical specification issues, for example, ISO/IEC 7816 requires the current supply is up to 50mA, this can not be provided by GPIO of nRF51/52. Although with our implementation, nRF51/52 are working perfectly as a SIM/USIM card reader, but I have no idea if use nRF 51/52 as a general card reader.
About our progress, it is no problem to let the 2 stacks (Softdevide and ISO7816) work "together" as TDM manner, it is working in our implementation. Since at any time, there is only 1 stack running. We are trying to make 2 stacks work concurrently by using timeslot feature of Softdevice.
