Undefined symbol assert_failed (referred from dma.o).
鏈接過程中出現assert_param函數未定義的錯誤
解決方法：
在Options->C/C++->preprocessor Symboles有Define:項中輸入USE_STDPERIPH_DRIVER，重新編譯鏈接，無警告無錯誤。
或其實，出現這種現象是由於你使用的main文件模板時將以下的函數刪掉了！所以直接加上相應的函數就OK！
1 #ifdef USE_FULL_ASSERT 2 /** 3 * @brief Reports the name of the source file and the source line number 4 * where the assert_param error has occurred. 5 * @param file: pointer to the source file name 6 * @param line: assert_param error line source number 7 * @retval : None 8 */ 9 #define assert_param(expr) ((expr) ? (void)0 : assert_failed((uint8_t *)__FILE__, __LINE__)) 10 /* Exported functions ------------------------------------------------------- */ 11 void assert_failed(uint8_t* file, uint32_t line); 12 #else 13 #define assert_param(expr) ((void)0) 14 #endif