feat(nfc): add phase-one card emulation mode

ql-application/threadx/interface/custom_app/nfc.c

@@ -7,14 +7,30 @@
 #include "ql_gpio.h"
 #include "app_inc.h"
 #include "ql_fs.h"
+#include "DP1312EA.h"
+#include "TypeA.h"
+#include "LPCD.h"
 
+#define NFC_WORK_MODE_READER          0
+#define NFC_WORK_MODE_CARD_EMULATION  1
+
+/*
+ * Phase-1 validation switch.
+ * Set to NFC_WORK_MODE_READER to restore the original NTAG213 reader flow.
+ */
+#ifndef NFC_WORK_MODE
+#define NFC_WORK_MODE NFC_WORK_MODE_CARD_EMULATION
+#endif
+
+#define DP1312EA_PIN_IRQ GPIO_PIN_NO_85
+
+#if (NFC_WORK_MODE == NFC_WORK_MODE_READER)
 extern int fota_start;
 extern int audio_packet_type;
 extern volatile int tts_playing;
 extern int g_testmode;
 
 static ql_sem_t nfc_irq_sem = NULL;
-#define DP1312EA_PIN_IRQ GPIO_PIN_NO_85
 
 // NFC 任务状态
 typedef enum {
@@ -25,7 +41,65 @@ typedef enum {
 static volatile nfc_state_t g_nfc_state = NFC_STATE_LPCD_WAIT;
 static volatile int g_poll_fail_count = 0;
 static volatile int g_nfc_irq_trigger = 0;
+#endif
 
+#if (NFC_WORK_MODE == NFC_WORK_MODE_CARD_EMULATION)
+static void nfc_card_emulation_log_status(const char *reason)
+{
+    printf("NFC card emulation %s: cmd=%02X irq=%02X err=%02X status1=%02X status2=%02X fifo=%02X\r\n",
+           reason,
+           DP1312EA_ReadRawRC(CommandReg),
+           DP1312EA_ReadRawRC(ComIrqReg),
+           DP1312EA_ReadRawRC(ErrorReg),
+           DP1312EA_ReadRawRC(Status1Reg),
+           DP1312EA_ReadRawRC(Status2Reg),
+           DP1312EA_ReadRawRC(FIFOLevelReg));
+}
+
+static void nfc_card_emulation_start(void)
+{
+    DP1312EA_WriteRawRC(CommandReg, DP1312EA_IDLE);
+    DP1312EA_WriteRawRC(ComIrqReg, 0x7F);
+    DP1312EA_WriteRawRC(DivIrqReg, 0x7F);
+    DP1312EA_SetBitMask(FIFOLevelReg, 0x80);
+
+    DP1312EA_Simulate_Card();
+    nfc_card_emulation_log_status("started");
+    printf("NFC phase-1 target: ATQA=44 00, UID=08 AA BB CC, SAK=00\r\n");
+}
+
+static void nfc_card_emulation_task(void)
+{
+    u8 last_command = 0xFF;
+    u8 command;
+
+    nfc_card_emulation_start();
+
+    while (1) {
+        command = DP1312EA_ReadRawRC(CommandReg) & 0x0F;
+
+        if (command != last_command) {
+            nfc_card_emulation_log_status("state changed");
+            last_command = command;
+        }
+
+        if (command != DP1312EA_AUTOCOLL) {
+            /*
+             * AutoColl normally exits after selection or on an RF/error event.
+             * Phase 1 has no ISO14443-4 handler yet, so allow the phone time to
+             * finish its probe, then arm AutoColl again for the next tap.
+             */
+            ql_rtos_task_sleep_ms(500);
+            nfc_card_emulation_start();
+            last_command = DP1312EA_AUTOCOLL;
+        }
+
+        ql_rtos_task_sleep_ms(20);
+    }
+}
+#endif
+
+#if (NFC_WORK_MODE == NFC_WORK_MODE_READER)
 static void nfc_irq_wake(void *args)
 {
     unsigned char level = 0;
@@ -41,10 +115,15 @@ static void nfc_irq_wake(void *args)
 		 ql_rtos_semaphore_release(nfc_irq_sem);
 	}
 }
+#endif
 
 
 void ql_nfc_task_thread(void *arvg)
 {
+#if (NFC_WORK_MODE == NFC_WORK_MODE_CARD_EMULATION)
+    printf("NFC work mode: CARD_EMULATION (phase 1)\r\n");
+    nfc_card_emulation_task();
+#else
     s8 read_status;
     
     while(1)
@@ -138,11 +217,13 @@ void ql_nfc_task_thread(void *arvg)
             }
         }
     }
+#endif
 }
 
 
 void DP1312EA_Init(void)
 {
+#if (NFC_WORK_MODE == NFC_WORK_MODE_READER)
     // 创建信号量
     ql_rtos_semaphore_create(&nfc_irq_sem, 0);
 
@@ -150,14 +231,20 @@ void DP1312EA_Init(void)
     ql_gpio_init(DP1312EA_PIN_IRQ, PIN_DIRECTION_IN, PIN_PULL_PD, PIN_LEVEL_LOW);
     ql_eint_register(DP1312EA_PIN_IRQ, PIN_RISING_EDGE, PIN_PULL_PD, NULL, nfc_irq_wake);
     ql_eint_enable_wakeup(DP1312EA_PIN_IRQ, PIN_RISING_EDGE);
+#else
+    /* Poll IRQ/status registers during the phase-1 card-emulation test. */
+    ql_gpio_init(DP1312EA_PIN_IRQ, PIN_DIRECTION_IN, PIN_PULL_PD, PIN_LEVEL_LOW);
+#endif
 
     // I2C 和芯片初始化
     DP1312EA_Reset();
     Check_Chip();
 
-    // 初始状态为低功耗等待
+    // Reader mode starts in low-power card detection.
+#if (NFC_WORK_MODE == NFC_WORK_MODE_READER)
     g_nfc_state = NFC_STATE_LPCD_WAIT;
     g_poll_fail_count = 0;
+#endif
     
     // 创建任务
     ql_task_t nfcTaskRef = NULL;