finally able to get freeRTOS run with current mouse + keyboard example

NOTES: print_greeting if is executed before the start of freeRTOS scheduler --> hardfault
- print_greeting->vsprintf->systick -> bunch of ISR --> hardfault.

printf using serial after the start of scheduler is ok though

demos/bsp/boards/board.c

@@ -37,15 +37,22 @@
 
 #include "board.h"
 
+#if TUSB_CFG_OS == TUSB_OS_NONE
 volatile uint32_t system_ticks = 0;
 
 void SysTick_Handler (void)
 {
   system_ticks++;
-#if TUSB_CFG_OS == TUSB_OS_NONE
   tusb_tick_tock(); // TODO temporarily
-#endif
 }
+#endif
+
+//void board_delay_blocking(uint32_t ms)
+//{
+//  volatile uint32_t delay_us = 1000*ms;
+//  delay_us *= (SystemCoreClock / 1000000) / 3;
+//  while(delay_us--);
+//}
 
 void check_failed(uint8_t *file, uint32_t line)
 {

demos/bsp/boards/board.h

@@ -68,6 +68,8 @@
 #define PRINTF_TARGET_SWO           3 // aka SWV, ITM
 #define PRINTF_TARGET_NONE          4
 
+#define PRINTF(...) printf(__VA_ARGS__)
+
 #if BOARD == 0
   #error BOARD is not defined or supported yet
 #elif BOARD == BOARD_NGX4330