[FL-3603] Support for external NFC field detection on the new NFC stack

firmware/targets/f7/api_symbols.csv

@@ -1278,6 +1278,9 @@ Function,+,furi_hal_mpu_protect_read_only,void,"FuriHalMpuRegion, uint32_t, Furi
 Function,+,furi_hal_nfc_abort,FuriHalNfcError,
 Function,+,furi_hal_nfc_acquire,FuriHalNfcError,
 Function,+,furi_hal_nfc_event_start,FuriHalNfcError,
+Function,+,furi_hal_nfc_field_detect_start,FuriHalNfcError,
+Function,+,furi_hal_nfc_field_detect_stop,FuriHalNfcError,
+Function,+,furi_hal_nfc_field_is_present,_Bool,
 Function,+,furi_hal_nfc_init,FuriHalNfcError,
 Function,+,furi_hal_nfc_is_hal_ready,FuriHalNfcError,
 Function,+,furi_hal_nfc_iso14443a_listener_set_col_res_data,FuriHalNfcError,"uint8_t*, uint8_t, uint8_t*, uint8_t"
@@ -2226,7 +2229,6 @@ Function,+,nfc_data_generator_fill_data,void,"NfcDataGeneratorType, NfcDevice*"
 Function,+,nfc_data_generator_get_name,const char*,NfcDataGeneratorType
 Function,+,nfc_device_alloc,NfcDevice*,
 Function,+,nfc_device_clear,void,NfcDevice*
-Function,+,nfc_device_is_equal_data,_Bool,"const NfcDevice*, NfcProtocol, const NfcDeviceData*"
 Function,+,nfc_device_copy_data,void,"const NfcDevice*, NfcProtocol, NfcDeviceData*"
 Function,+,nfc_device_free,void,NfcDevice*
 Function,+,nfc_device_get_data,const NfcDeviceData*,"const NfcDevice*, NfcProtocol"
@@ -2235,6 +2237,7 @@ Function,+,nfc_device_get_protocol,NfcProtocol,const NfcDevice*
 Function,+,nfc_device_get_protocol_name,const char*,NfcProtocol
 Function,+,nfc_device_get_uid,const uint8_t*,"const NfcDevice*, size_t*"
 Function,+,nfc_device_is_equal,_Bool,"const NfcDevice*, const NfcDevice*"
+Function,+,nfc_device_is_equal_data,_Bool,"const NfcDevice*, NfcProtocol, const NfcDeviceData*"
 Function,+,nfc_device_load,_Bool,"NfcDevice*, const char*"
 Function,+,nfc_device_reset,void,NfcDevice*
 Function,+,nfc_device_save,_Bool,"NfcDevice*, const char*"

firmware/targets/f7/furi_hal/furi_hal_nfc.c

@@ -401,6 +401,47 @@ FuriHalNfcError furi_hal_nfc_reset_mode() {
     return error;
 }
 
+FuriHalNfcError furi_hal_nfc_field_detect_start() {
+    FuriHalNfcError error = FuriHalNfcErrorNone;
+    FuriHalSpiBusHandle* handle = &furi_hal_spi_bus_handle_nfc;
+
+    st25r3916_write_reg(
+        handle,
+        ST25R3916_REG_OP_CONTROL,
+        ST25R3916_REG_OP_CONTROL_en | ST25R3916_REG_OP_CONTROL_en_fd_mask);
+    st25r3916_write_reg(
+        handle, ST25R3916_REG_MODE, ST25R3916_REG_MODE_targ | ST25R3916_REG_MODE_om0);
+
+    return error;
+}
+
+FuriHalNfcError furi_hal_nfc_field_detect_stop() {
+    FuriHalNfcError error = FuriHalNfcErrorNone;
+    FuriHalSpiBusHandle* handle = &furi_hal_spi_bus_handle_nfc;
+
+    st25r3916_clear_reg_bits(
+        handle,
+        ST25R3916_REG_OP_CONTROL,
+        (ST25R3916_REG_OP_CONTROL_en | ST25R3916_REG_OP_CONTROL_en_fd_mask));
+
+    return error;
+}
+
+bool furi_hal_nfc_field_is_present() {
+    bool is_present = false;
+    FuriHalSpiBusHandle* handle = &furi_hal_spi_bus_handle_nfc;
+
+    if(st25r3916_check_reg(
+           handle,
+           ST25R3916_REG_AUX_DISPLAY,
+           ST25R3916_REG_AUX_DISPLAY_efd_o,
+           ST25R3916_REG_AUX_DISPLAY_efd_o)) {
+        is_present = true;
+    }
+
+    return is_present;
+}
+
 FuriHalNfcError furi_hal_nfc_poller_field_on() {
     FuriHalNfcError error = FuriHalNfcErrorNone;
     FuriHalSpiBusHandle* handle = &furi_hal_spi_bus_handle_nfc;

firmware/targets/furi_hal_include/furi_hal_nfc.h

@@ -113,6 +113,24 @@ FuriHalNfcError furi_hal_nfc_set_mode(FuriHalNfcMode mode, FuriHalNfcTech tech);
  */
 FuriHalNfcError furi_hal_nfc_reset_mode();
 
+/** Start field detection
+ *
+ * @return FuriHalNfcError
+ */
+FuriHalNfcError furi_hal_nfc_field_detect_start();
+
+/** Stop field detection
+ *
+ * @return FuriHalNfcError
+ */
+FuriHalNfcError furi_hal_nfc_field_detect_stop();
+
+/** Check if external NFC field is present
+ *
+ * @return FuriHalNfcError
+ */
+bool furi_hal_nfc_field_is_present();
+
 /** Turn on field
  *
  * @return FuriHalNfcError