ST25R3911B: How to read tag's memory?
Hello there,
I am using this shield:
https://www.st.com/en/ecosystems/x-nucleo-nfc05a1.html
Connected to the Nucleo64 L476RG board.
I wanted to utilize this demo:
The problem was that there is the source code generated by CubeMX provided, without the actual CubeMX project available. Because of that, instead of generating code from CubeMx, I had to generate CubeMx project from code by hand. I have placed the whole project here in case anyone needs that:
https://github.com/bremenpl/NFC5
The project works and the demo reads some data from a tag placed on the PCB antenna.
I need to read the tags memory (that 256 bytes of data) but I dont know how to do that. In the demo, there are a lot of hardcoded variables and the whole architecture is merely readable. After a while I found out that in this function the data is exchanged:
demo.c:
/*!
*****************************************************************************
* \brief Exchange APDUs
*
* Example how to exchange a set of predefined APDUs with PICC. The NDEF
* application will be selected and then CC will be selected and read.
*
*****************************************************************************
*/
void demoSendAPDUs( void )
{
uint16_t rxLen;
ReturnCode err;
/* Exchange APDU: NDEF Tag Application Select command */
err = demoIsoDepBlockingTxRx(&gDevProto.isoDepDev, ndefSelectApp, sizeof(ndefSelectApp), gRxBuf.rxBuf, sizeof(gRxBuf.rxBuf), &rxLen);
if( (err == ERR_NONE) && gRxBuf.rxBuf[0] == 0x90 && gRxBuf.rxBuf[1] == 0x00)
{
platformLog(" Select NDEF App successfully \r\n");
/* Exchange APDU: Select Capability Container File */
err = demoIsoDepBlockingTxRx(&gDevProto.isoDepDev, ccSelectFile, sizeof(ccSelectFile), gRxBuf.rxBuf, sizeof(gRxBuf.rxBuf), &rxLen);
/* Exchange APDU: Read Capability Container File */
err = demoIsoDepBlockingTxRx(&gDevProto.isoDepDev, readBynary, sizeof(readBynary), gRxBuf.rxBuf, sizeof(gRxBuf.rxBuf), &rxLen);
}
}I need to figure out what command to send in order to read the memory. Its not easy, since the Author decided to hardcode all the used commands:
/* P2P communication data */
static uint8_t NFCID3[] = {0x01, 0xFE, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A};
static uint8_t GB[] = {0x46, 0x66, 0x6d, 0x01, 0x01, 0x11, 0x02, 0x02, 0x07, 0x80, 0x03, 0x02, 0x00, 0x03, 0x04, 0x01, 0x32, 0x07, 0x01, 0x03};
/* APDUs communication data */
static uint8_t ndefSelectApp[] = { 0x00, 0xA4, 0x04, 0x00, 0x07, 0xD2, 0x76, 0x00, 0x00, 0x85, 0x01, 0x01, 0x00 };
static uint8_t ccSelectFile[] = { 0x00, 0xA4, 0x00, 0x0C, 0x02, 0xE1, 0x03};
static uint8_t readBynary[] = { 0x00, 0xB0, 0x00, 0x00, 0x0F };
/*static uint8_t ppseSelectApp[] = { 0x00, 0xA4, 0x04, 0x00, 0x0E, 0x32, 0x50, 0x41, 0x59, 0x2E, 0x53, 0x59, 0x53, 0x2E, 0x44, 0x44, 0x46, 0x30, 0x31, 0x00 };*/
/* P2P communication data */
static uint8_t ndefPing[] = {0x00, 0x00};
static uint8_t ndefInit[] = {0x05, 0x20, 0x06, 0x0F, 0x75, 0x72, 0x6E, 0x3A, 0x6E, 0x66, 0x63, 0x3A, 0x73, 0x6E, 0x3A, 0x73, 0x6E, 0x65, 0x70, 0x02, 0x02, 0x07, 0x80, 0x05, 0x01, 0x02};
static uint8_t ndefUriSTcom[] = {0x13, 0x20, 0x00, 0x10, 0x02, 0x00, 0x00, 0x00, 0x19, 0xc1, 0x01, 0x00, 0x00, 0x00, 0x12, 0x55, 0x00, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f, 0x77, 0x77, 0x77, 0x2e, 0x73, 0x74, 0x2e, 0x63, 0x6f, 0x6d};Basing on this it is not possible to figure out what is the frame format or anything. I could not find it in the datasheet either.
I would really appreciate all help regarding this issue. Any hints or links for finding the required information (or providing it) would be really helpful!