这是报错的
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_Cmd (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_DeInit (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_GetCalibrationStatus (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_GetConversionValue (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_GetFlagStatus (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_GetResetCalibrationStatus (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_Init (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_RegularChannelConfig (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_ResetCalibration (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_SoftwareStartConvCmd (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_StartCalibration (referred from adc.o).
..\OBJ\PWM.axf: Error: L6218E: Undefined symbol ADC_TempSensorVrefintCmd (referred from adc.o).
Not enough information to list image symbols.

是库文件没有拷贝去过或者搜索路径没有设置好吧。

貌似PWM.C中未定义头文件 adc.h

试着包含一下adc.h的头文件

没有添加STM32XX_ADC.C文件。