Renamed ./src/external to ./src/extensions. No code logic changes. (0.40.5)

web/documentation/extensions/pcsc/pcsc.md

@@ -0,0 +1,36 @@
+---
+layout: page
+published: true
+noToc: false
+noComments: false
+noDate: false
+title: Fun - PC/SC (smart cards) extension (optional)
+subtitle: Documentation for PC/SC (smart cards) extension (optional)
+description: Documentation for PC/SC (smart cards) extension (optional)
+permalink: /documentation/extensions/pcsc/
+lang: en
+tags:
+- cards
+- extension
+- optional
+- smart
+---
+
+
+- CMake option: FUN_WITH_PCSC=ON
+- Purpose: Access smart card readers/cards via PC/SC (pcsclite).
+- Homepage: [https://pcsclite.apdu.fr/](https://pcsclite.apdu.fr/){:class="ext"}
+
+## Opcodes:
+
+- OP_PCSC_ESTABLISH: returns context id (>0) or 0
+- OP_PCSC_RELEASE: pops ctx id; returns 1/0
+- OP_PCSC_LIST_READERS: pops ctx id; returns array of reader names
+- OP_PCSC_CONNECT: pops reader, ctx id; returns handle (>0) or 0
+- OP_PCSC_DISCONNECT: pops handle id; returns 1/0
+- OP_PCSC_TRANSMIT: pops apdu, handle id; returns map with data/SW/rc
+
+## Notes:
+
+- Requires PC/SC lite development headers/libs.
+- Behavior and availability depend on platform and reader drivers.