move code in host demo to /src in prepare for support freeRTOS projects

demos/host/src/main.c

@@ -0,0 +1,50 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "boards/board.h"
+#include "tusb.h"
+
+#if defined(__CODE_RED)
+  #include <cr_section_macros.h>
+  #include <NXP/crp.h>
+  // Variable to store CRP value in. Will be placed automatically
+  // by the linker when "Enable Code Read Protect" selected.
+  // See crp.h header for more information
+  __CRP const unsigned int CRP_WORD = CRP_NO_CRP ;
+#endif
+
+int main(void)
+{
+  uint32_t current_tick = system_ticks;
+
+  board_init();
+  tusb_init();
+
+  //------------- application task init -------------//
+  keyboard_app_init();
+  mouse_app_init();
+
+  printf("reset\n");
+  while (1)
+  {
+    tusb_task_runner();
+    keyboard_app_task();
+    mouse_app_task();
+
+    if (current_tick + CFG_TICKS_PER_SECOND < system_ticks)
+    {
+      static uint8_t timeout_10_ms = 0;
+      timeout_10_ms = (timeout_10_ms+1) % 10;
+      if (timeout_10_ms % 10 == 0)
+      {
+        printf("tinyusb: " __DATE__ "\t" __TIME__ "\n"); // toggle leds on EA4357 is quite troublesome
+      }
+
+      current_tick += CFG_TICKS_PER_SECOND;
+      board_leds(0x01, (current_tick/CFG_TICKS_PER_SECOND)%2); /* Toggle LED once per second */
+    }
+  }
+
+  return 0;
+}