keil編譯出現如下警告:
WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: UART0
MODULE: .\obj\app_uart0.obj (APP_UART0)
WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: UART0
MODULE: .\obj\app_uart0.obj (APP_UART0)
ADDRESS: 31ACH
解決辦法:L1和L2是同一問題,是Uart0在程式中使用了,但是沒定義;
如下:uart.h檔案中結構體
typedef struct
{
u8 RxOk;
}USART_DEF;
extern USART_DEF Uart0;
uart.c中需要定義下USART_DEF Uart0;