refactor(touch): 集成硬件 I2C 驱动并添加 EXTI 中断支持

- 将 touch 底层从软件 I2C 位冲切换为硬件 I2C0 (PB6/PB7)
- 修复 i2c_driver I2C0 引脚映射 (PB8/PB9 -> PB6/PB7)
- 重写 master_write_read() 实现正确的重复起始条件
- 添加 i2c_driver.h C API 声明供 C 代码调用
- 添加 GT1151 EXTI 中断 (PD11, EXTI11 下降沿触发)
- 删除 touch.h 中废弃的软件 I2C 函数声明
- test_touch() 改为中断驱动，无触摸时 I2C 总线空闲

app/main.cpp

@@ -6,6 +6,7 @@
 #include "sdram_manager.h"
 #include "flash_manager.h"
 #include "lcd.h"
+#include "touch.h"
 #include <cstdio>
 #include <cstring>
 
@@ -346,7 +347,106 @@ static void concurrent_loop(void)
 }
 
 // =============================================================
-// 主函数
+//  Touch 测试
+        // =============================================================
+
+        static void test_touch(void)
+    {
+        printf("\r\n===== Touch 测试 (中断驱动) =====\r\n");
+
+        uint8_t ret = GT1151_Init();
+        if (ret != 0)
+        {
+            printf("  Touch 初始化失败 (ret=%d)\r\n", ret);
+            return;
+        }
+        printf("  Touch 初始化成功，等待触摸中断...\r\n");
+
+        LCD_Clear(0x0841);
+        POINT_COLOR = CYAN;
+        LCD_ShowString(10, 10, 460, 24, 16, 0, (uint8_t *)"=== Touch Test (IRQ) ===");
+        POINT_COLOR = WHITE;
+        LCD_ShowString(10, 35, 460, 24, 16, 0, (uint8_t *)"Touch screen now");
+        LCD_ShowString(10, 55, 300, 24, 16, 0, (uint8_t *)"IRQ driven, watch UART");
+        LCD_ShowString(10, 75, 200, 24, 16, 0, (uint8_t *)"X:0  Y:0");
+
+        uint16_t last_x = 0xFFFF;
+        uint16_t last_y = 0xFFFF;
+        uint32_t idle_counter = 0;
+        bool was_touching = false;
+        uint32_t iter = 0;
+
+        g_touch_irq_flag = 0;
+
+        while (1)
+        {
+            if (g_touch_irq_flag)
+            {
+                g_touch_irq_flag = 0;
+                delay_1ms(5);
+
+                GT1151_Scan(0);
+
+                if (tp_dev.sta & TP_PRES_DOWN)
+                {
+                    idle_counter = 0;
+                    uint16_t x = tp_dev.x[0];
+                    uint16_t y = tp_dev.y[0];
+
+                    printf("[TOUCH] iter=%lu  sta=0x%02X  x=%u  y=%u\r\n",
+                           (unsigned long)iter, tp_dev.sta, x, y);
+
+                    if (x < lcddev.width && y < lcddev.height)
+                    {
+                        POINT_COLOR = BLACK;
+                        LCD_FillRectangle(10, 75, 200, 95);
+                        POINT_COLOR = GREEN;
+                        char buf[24];
+                        sprintf(buf, "X:%-3d  Y:%-3d", x, y);
+                        LCD_ShowString(10, 75, 200, 24, 16, 0, (uint8_t *)buf);
+
+                        if (was_touching && last_x != 0xFFFF)
+                        {
+                            POINT_COLOR = MAGENTA;
+                            LCD_DrawLine(last_x, last_y, x, y);
+                        }
+
+                        POINT_COLOR = YELLOW;
+                        LCD_FillCircle(x, y, 4);
+
+                        last_x = x;
+                        last_y = y;
+                        was_touching = true;
+                    }
+                }
+                else
+                {
+                    was_touching = false;
+                    last_x = 0xFFFF;
+                    last_y = 0xFFFF;
+                }
+
+                iter++;
+            }
+            else
+            {
+                idle_counter++;
+                delay_1ms(10);
+                if (idle_counter > 500)
+                {
+                    printf("  无触摸超过 5 秒，退出 Touch 测试\r\n");
+                    break;
+                }
+            }
+        }
+
+        LCD_Clear(BLUE);
+        printf("  Touch 测试完成\r\n");
+        delay_1ms(500);
+    }
+
+    // =============================================================
+    // 主函数
 // =============================================================
 int main(void)
 {
@@ -438,6 +538,9 @@ int main(void)
     concurrent_loop();
     delay_1ms(500);
 
+    test_touch();
+    delay_1ms(500);
+
     // ---- 主循环 ----
     led_pattern(0x0F);
     printf("\r\n===== 所有外设测试完成 =====\r\n");