Build target 'Target 1'
assembling STM32F10x.s...
compiling stm32test.c...
stm32test.c(18): warning: #1-D: last line of file ends without a newline
linking...
stm32test.axf: Error: L6218E: Undefined symbol GPIO_Init (referred from stm32test.o).
Target not created
是什么原因啊