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springcard-ccid-serial

PC/SC-Like library and CCID "driver" for PC/SC couplers over a Serial link

This project is associated with SpringCard document PNA23174 Application Note: Using the M519 in PC/SC Coupler mode over a Serial interface.

Please download this document here: https://www.springcard.com/en/download/find/file/pna23174

Introduction

PC/SC is the de-facto standard to make an application running on a high-end computer (say, a PC) interact with a smart card (SC).

SpringCard offers numerous USB products that comes with a PC/SC driver for desktop and server operating systems. SpringCard also offers products that use another communication channel as their primary interface: Bluetooth, Ethernet (network), or Serial.

Serial devices namely target low-end, OS-less systems, where USB is not available. On such targets, there is of course no PC/SC stack, no support for plug'n'play drivers. The goal of this project is to mimic the standard PC/SC stack (hence the name "PC/SC-Like") and provide a minimal, Serial-based CCID driver, to provide a seamless experience for developers who are familiar with PC/SC and/or with the development of a smart card-aware application, and are integrating a SpringCard Serial PC/SC coupler in their embedded system.

Compliant products

M519 family

The M519 and all its derivative products (for instance M519-SUV) are supported.

In particular, the M519-SRK (Starter Kit) is supported, and is our development and validation platform. Examples and documentations will refer to this SRK.

K663 family

The K663 and all its derivative products (for instance K663-TTL) are supported, provided that they firmware version is >= 2.02. Earlier versions of K663 could be upgraded.

K531 and K632 are not supported.

API Reference

The .html files within the /docs folder are your primary source of information.

Sample

The /src/sample/pcsc-serial-sample.c has all you need.

Porting the library to your MCU

Use the /src/hal/skel/hal_skel.c file as reference.

Your hardware-abstraction layer (HAL) must provide the following features:

Serial communication with the module.

The CCID_SerialOpen function shall configure the UART (38400bps, 8 data bits, 1 stop bit, no parity, no flow control).

The CCID_SerialSendByte and CCID_SerialSendBytes are used to transmit (TX) from the MCU to the module.

Receiving (RX) must be done in an ISR. The ISR shall call CCID_SerialRecvByteFromISR for every byte that comes from the module to the MCU.

Wait for the end of the communication.

CCID_WaitWakeup will be called in the context of the main task, and shall block until CCID_SerialRecvByteFromISR has called CCID_WakeupFromISR.

You must implement CCID_WaitWakeup and CCID_WakeupFromISR to provide this behaviour.

If you don't have an OS, a simple flag (volatile BOOL) does the job easily.

Under a multi-task/multi-thread kernel, you must use a 'Event' or 'Semaphore' object to implement this correctly.

Under FreeRTOS (http://www.freertos.org) you could typically use a Binary Semaphore as follow:

  • CCID_WaitWakeup blocks using xSemaphoreTake
  • CCID_WakeupFromISR calls xSemaphoreGiveFromISR to unblock.

Manage delays

The libraries expects to have a function named sleep_ms to wait for the specified number of milliseconds.

License

This library is Copyright (c) 2015-2023 SPRINGCARD SAS, FRANCE - http://www.springcard.com

Permission is given to embed it in your own MCU (or even PC-based) projects, provided that this project is always used in conjunction with a genuine SpringCard product.

Please read the LICENSE.txt file for details.