Add nfcfEmulationTransmit and remove redundant _u.update in emulation

Author: GOB52

src/nfc/layer/f/emulation_layer_f_ST25R3916.cpp

@@ -211,9 +211,9 @@ bool ListenerST25R3916ForF::stop_emulation()
            _u.writeModeDefinition(0x00);
 }
 
-bool ListenerST25R3916ForF::transmit(const uint8_t* tx, const uint16_t tx_len, const uint32_t timeout_ms)
+bool ListenerST25R3916ForF::transmit(const uint8_t* tx, const uint16_t tx_len, const uint32_t /*timeout_ms*/)
 {
-    return _u.nfcfTransmit(tx, tx_len, timeout_ms);
+    return _u.nfcfEmulationTransmit(tx, tx_len);
 }
 
 // ------------------------------------------------------------
@@ -284,7 +284,6 @@ EmulationLayerF::State ListenerST25R3916ForF::goto_communicated()
     _u.writeDirectCommand(CMD_UNMASK_RECEIVE_DATA);
     //       rfalCheckEnableObsModeRx();
 
-    _u.update();
     return update_communicated();
     return EmulationLayerF::State::Communicated;
 }
@@ -303,7 +302,6 @@ EmulationLayerF::State ListenerST25R3916ForF::goto_selected()
     (void)get_irq(I_par32 | I_crc32 | I_err232 | I_err132);
     _u.enable_interrupts(I_rxe32);
 
-    _u.update();
     return update_selected();
     return EmulationLayerF::State::Selected;
 }

src/unit/unit_ST25R3916.hpp

@@ -1901,6 +1901,8 @@ class UnitST25R3916 : public Component {
       @return True if successful
      */
     bool nfcfTransmit(const uint8_t* tx, const uint16_t tx_len, const uint32_t timeout_ms);
+    //! @brief Transmit in emulation (PICC) mode with minimal I2C overhead
+    bool nfcfEmulationTransmit(const uint8_t* tx, const uint16_t tx_len);
     /*!
       @brief Receive from NFC-F PICC
       @param[out] rx Receive buffer

src/unit/unit_ST25R3916_nfcf.cpp

@@ -101,6 +101,16 @@ bool UnitST25R3916::nfcfTransmit(const uint8_t* tx, const uint16_t tx_len, const
     return wait_for_interrupt(I_txe32, timeout_ms) & I_txe32;
 }
 
+bool UnitST25R3916::nfcfEmulationTransmit(const uint8_t* tx, const uint16_t tx_len)
+{
+    if (!tx || !tx_len) {
+        return false;
+    }
+    return writeDirectCommand(CMD_CLEAR_FIFO) &&  //
+           writeFIFO(tx, tx_len) &&               //
+           writeNumberOfTransmittedBytes(tx_len, 0) && writeDirectCommand(CMD_TRANSMIT_WITH_CRC);
+}
+
 bool UnitST25R3916::nfcfReceive(uint8_t* rx, uint16_t& rx_len, const uint32_t timeout_ms)
 {
     CHECK_MODE();