Update NFC content on-the-fly

RE: Update NFC content on-the-fly

Batov — Tue, 26 May 2020 13:29:58 GMT

I have found a issue.

Details at nRF5_SDK_14.2.0\components\nfc\t2t_lib\nfc_fixes.h.

I do not have BOARD_PCA10040 define for my custom board.

HAL_NFC_ENGINEERING_BC_FTPAN_WORKAROUND define fix my issue.

RE: Update NFC content on-the-fly

Batov — Mon, 11 May 2020 17:19:42 GMT

Thanks a lot for you help!

You example works fine for my case. I will try find issue at my code.

RE: Update NFC content on-the-fly

Jørgen Holmefjord — Thu, 07 May 2020 13:34:25 GMT

I made a modified version of the NFC record_url example, but I'm not able to reproduce the issue you are seeing:

<info> app: NFC URL start
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: NFC_T2T_EVENT_FIELD_OFF
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: nfc_t2t_emulation_stop
<info> app: nfc_t2t_emulation_start
<info> app: NFC_T2T_EVENT_FIELD_ON
<info> app: NFC_T2T_EVENT_DATA_READ
<info> app: NFC_T2T_EVENT_FIELD_OFF

Here is the project I used (SDK 14.2.0): devzone.nordicsemi.com/.../record_5F00_url_5F00_update.zip

Can you share the project you used to reproduce this?

RE: Update NFC content on-the-fly

Batov — Wed, 29 Apr 2020 14:57:32 GMT

I have call nfc_t2t_emulation_stop from application context.

main.c

nfc_init("1", "2");
nrf_delay_ms(5000);
nfc_start("3");

nfc.c

static void nfc_callback(void * p_context, nfc_t2t_event_t event, const uint8_t * p_data, size_t data_length)
{
    (void)p_context;

    switch (event)
    {
        case NFC_T2T_EVENT_FIELD_ON:
            NRF_LOG_DEBUG("NFC_T2T_EVENT_FIELD_ON");
            break;
        case NFC_T2T_EVENT_FIELD_OFF:
            NRF_LOG_DEBUG("NFC_T2T_EVENT_FIELD_OFF");
            break;
        case NFC_T2T_EVENT_DATA_READ:
			NRF_LOG_DEBUG("NFC_T2T_EVENT_DATA_READ");
			break;
        case NFC_T2T_EVENT_STOPPED:
			NRF_LOG_DEBUG("NFC_T2T_EVENT_STOPPED");
			break;
        default:
            break;
    }
}

void nfc_init(char *p_fw_ver, char *p_hw_rev)
{
	NRF_LOG_DEBUG("NFC init");

	uint32_t  err_code;
	uint32_t  len = sizeof(m_ndef_msg_buf);

	err_code = nfc_t2t_setup(nfc_callback, NULL);
	APP_ERROR_CHECK(err_code);

	err_code = msg_encode(m_ndef_msg_buf, &len);
	APP_ERROR_CHECK(err_code);

	err_code = nfc_t2t_payload_set(m_ndef_msg_buf, len);
	APP_ERROR_CHECK(err_code);

	err_code = nfc_t2t_emulation_start();
	APP_ERROR_CHECK(err_code);
}

void nfc_start(char *test)
{
	NRF_LOG_DEBUG("NFC start");

	uint32_t  err_code;
	uint32_t  len = sizeof(m_ndef_msg_buf);

	err_code = nfc_t2t_emulation_stop();
	NRF_LOG_DEBUG("nfc_t2t_emulation_stop: 0x%x", err_code);

	err_code = msg_encode(m_ndef_msg_buf, &len);
	APP_ERROR_CHECK(err_code);

	err_code = nfc_t2t_payload_set(m_ndef_msg_buf, len);
	APP_ERROR_CHECK(err_code);

	err_code = nfc_t2t_emulation_start();
	APP_ERROR_CHECK(err_code);
}

logs with issue:

00> [00000000] <debug> NFC: NFC init
00> [00001374] <debug> NFC: NFC_T2T_EVENT_FIELD_ON
00> [00001491] <debug> NFC: NFC_T2T_EVENT_DATA_READ
00> [00005110] <debug> NFC: NFC start
00> [00005110] <debug> NFC: nfc_t2t_emulation_stop: 0x0

logs without issue:

00> [00000000] <debug> NFC: NFC init
00> [00003898] <debug> NFC: NFC_T2T_EVENT_FIELD_ON
00> [00004017] <debug> NFC: NFC_T2T_EVENT_DATA_READ
00> [00004402] <debug> NFC: NFC_T2T_EVENT_FIELD_OFF
00> [00005014] <debug> NFC: NFC start
00> [00005014] <debug> NFC: nfc_t2t_emulation_stop: 0x0
00> [00009423] <debug> NFC: NFC_T2T_EVENT_FIELD_ON
00> [00009541] <debug> NFC: NFC_T2T_EVENT_DATA_READ
00> [00009806] <debug> NFC: NFC_T2T_EVENT_FIELD_OFF

Issue: Unable to update NFC payload after NFC_T2T_EVENT_FIELD_ON event. Tag is unavailable for any readers.

RE: Update NFC content on-the-fly

Jørgen Holmefjord — Wed, 29 Apr 2020 12:44:42 GMT

Hi,

Did you check the return code from call to nfc_t2t_emulation_stop? It may be that you cannot call these functions from interrupt context. Can you try to set a flag in the event handler, and do the payload update in the main context?

Best regards,
Jørgen