add new LED key systick sample code

guowenxue

2018-05-16 a22d9c106276bb1819e583012d7ea41b6529b318

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#ifndef __DEBUG_UART_H__1V2039076V__
#define __DEBUG_UART_H__1V2039076V__
 
void dbg_setup_uart(void);
 
#endif /* __DEBUG_UART_H__1V2039076V__ */