[QN9083 ]: To use ISO7816 with QN908x

[waynejeong]

Hello.

I want to implement ISO7816 interface using QN9083 with smart card IC. According to UM11023, QN908x series can support ISO7816 interface. I had try to find ISO7816 driver example in SDK_2.2_QN908XCDK, but I could not find it.

If there is the ISO7816 driver example code, please let me know how can I get.

[kishansaralaya]

Hi Wayne Jeong and Thomas,

 Have you successfully able to implement ISO7816 interface in QN908x

[kishansaralaya]

Hi All,
Am able to get a response from the smart card using the config settings mentioned in this thread. While configuring the QN9080 for a bidirectional communication (ISO7816 - half duplex) need to know what additional configurations need to be added apart from the below steps: 
    //Interrupt driven USART config used to Read the Smart card response. 

 
  step 1.  flexCom0->IOMODE = FLEXCOMM_IOMODE_DIO_MODE(1)|FLEXCOMM_IOMODE_DIO_OEN(0);

  step 2. CardReset();

  step 3.  //Read ATR value in the IRQ method.

  step 4.  //Config Rx port for Sending APDU command.

  step 5.   flexCom0->IOMODE = FLEXCOMM_IOMODE_DIO_MODE(1)|FLEXCOMM_IOMODE_DIO_OEN(1); 

  step 6.  USART_WriteBlocking(SMARTCARD_USART, apdu, sizeof(apdu) / sizeof(apdu[0]));

  step 7.  //Some configurations need to done here ?

  step 8.    flexCom0->IOMODE = FLEXCOMM_IOMODE_DIO_MODE(1)|FLEXCOMM_IOMODE_DIO_OEN(0);

  step 9.    //Read APDU response in the IRQ handler

Need to know what specific function/configuration I need to call at step 7?, kindly do the needful.

[kishansaralaya]

Am able to successfully configure the QN908x with ISO7816 mode and communicate, the only step missing in the above list is the FIFOCFG configuration. After setting that everything worked as needed.

[gerardo_rodriguez]

Hello Wayne Jeong,

The QN908x USART only supports the bidirectional/half-duplex communication needed by the 7816 protocol.

Unfortunately, there is no example application for this feature, but it shouldn't be very hard to implement. In the FLEXCOMx_IOMODE register, you need to enable the DIO_MODE bit to enable bidirectional mode and the DIO_OEN bit indicates if the pin will act as a receiver or as a transmitter.

Let me know any question you may have.

Regards,

Gerardo

[thomasyoun]

Dear Gerardo~

I'm going to make a card reader through the ISO7816.

For other manufactures, MCU pins are required for ISO7816 communication.

Please refer to the following...

   (LINK : ST 7816 )

   1. USART_CK(Smartcard clock), 

   2. USART_TX(IO serial data: open drain),  

   3.Any GPIO(Reset to card),

   4. Any GPIO(Supply voltage),

   5.Any GPIO(Programming voltage)

I have a question~

For Qn908x MCU, 

Is USART0 Tx a Smartcard CK? Is USART0 Rx the Smartcard data?     

=> PA04 : Smartcard CLK(?), PA05 : Smartcard DATA(FC0_RXD_SDA_MOSI)

if not,

If the pin description in the QN908x datasheet says USART Clock

Is USART0 CLK a Smartcard CK? Is USART0 Rx the Smartcard data? 

 => PA18 : Smartcard CLK(?), PA18 : Smartcard DATA(FC0_RXD_SDA_MOSI)

   

I want to circuit first.

If you have a sample program, please share it.

Thank you.

[gerardo_rodriguez]

Hello Thomas,

When 7816 mode is enabled, the USART RX (FCn_RXD) is the bidirectional I/O data pin. The USART SCK (FCn_SCK) could be used as the smart card clock, but you should verify with the smartcard specification about the required clock frequency. If you need a higher frequency than what the USART SCK generates you could use a separate timer for generating this clock.

The USART pins on Flexcomm 0 are: 

- PA05 or PA17 for FC0_RXD.

- PA18 or PA19 for FC0_SCK.

As reference, you can use the application note AN4453 which describes a smart card interface implemented in a different MCU.

Regards,

[kishansaralaya]

Dear Gerado Rodriguez,

Need few suggestions on implementing ISO7816 interface using QN908x controller,
1. Can we make use USART polling mechanism as a interface between Smart card and the controller.
2. Is there a way to increase the Rx buffer size.if am not wrong by default buffer size is limited to 16 bytes.