初始版本

external/infineon/pal/nrf5x/README.md

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+# General
+
+All projects built with the nrf5x PAL need to set `DL_MAX_FRAME_SIZE=250` via
+a global define, because the nrf5x doesn't support the default frame size.
+
+To use the PAL together with other I2C devices and be able to run it also on a BLE Shield2Go
+make a global define `IFX_2GO_SUPPORT`.
+
+# Nordic SDK `nrf_crypto` backend
+
+To use the OPTIGA with the `nrf_crypto` API the Nordic SDK needs to be modified
+according to the following steps.
+
+Locate the folder <NRF_SDK>/components/libraries/crypto/. In each file listed in
+the following table locate the include statement section starting with the
+comment `// Include all backends`.
+
+Append the corresponding OPTIGA backend header file include statement at the end
+of each respective include block.
+
+|File                        |Include statement to append        |
+|----------------------------|-----------------------------------|
+|`nrf_crypto_ecc_backend.h`  |`#include "optiga_backend_ecc.h"`  |
+|`nrf_crypto_ecdh_backend.h` |`#include "optiga_backend_ecdh.h"` |
+|`nrf_crypto_ecdsa_backend.h`|`#include "optiga_backend_ecdsa.h"`|
+|`nrf_crypto_rng_backend.h`  |`#include "optiga_backend_rng.h"`  |
+
+# Memory Allocation
+
+The library allocates memory on the heap. To ensure correct operation the heap
+must be sufficiently large, e.g. 8,192 Bytes.