数字化LED光源控制器设计

123201211671—181520113-0560-04ScienceTechnologyandEngineeringVol.12No.3Jan.20122012Sci.Tech.Engrg.LED510640USBLED。ARMCortex－M3STM32F107PWM、、。PWM。STM32USB2．0PWMTP368.1A20111018632009AA4Z111、2007BAH13B06、2011ZM00561988—。、。、、、、CCD、。。RS232PC。STARMCortex－M3STM32STM32F107VCT612USBPCPC。STM32PWM。、。。1PCLEDPWM。PCUSB。LED。PC。LEDLED。LEDLED。LEDPWM3。LED。LED。PWMLED。LED。、PWM。1。、。1LED。2STM32F107VCT6。STM32、、ARMCor-tex－M3。STM32F107VCT6STM3272MHz。MCUPWMPWMLEDPWM。Cortex－M3/IO。。。USBSTM32F107VCT6USB-OTG4PC。2。23KeilARMRealViewMDKSTM325。3．1GUIDwindowsAPIWriteFileReadFileCreateFile6。3．2USBUSBBulk-Only1IN2OUT。USBWDM。。DriverEntryIRP。IO。IOIRP。IRPCreatFileBulkUsb_DispatchCreate7。IRP。3。1653LED3USB3．3STM32。。STUSB。4。4。。main。mainGPIOUSB。。USBEP2EP2_OUT_Call-back。。。TIM1PWM16PWMled。PWMTIM116TIM_ARR。fpwm=fTIM_clock/TIM_ARR+11TIM116TIM_CCRTIM_ARR。fduty=TIM_CCR/TIM_ARR+1×100%2PWM。TIM2TIM3TIM4TIM5。。4。3000．192ms1ms5a26512b、c、d20%60%100%。5。5LEDPCRS232、STM32F107VCT6USB。PWM。。1STMicroelectronics．STM32Referencemanual．20092．USB2．0OTG．20043．LEDPWM．2010182109—1114．STM32USBOTG．201130102—35．STM32ARMCortex—M3．20086．Windows2000/XPWDM．20037．STM32USB．2010212—3DesignoftheDigitalLEDLightingControllerXIEPeng-chengLAIYi-zongLIDiDept．ofMechanical＆AutomotiveEngineeringSouthChinaUniversityofTechnologyGuangzhou510640P．R．ChinaAbstractInordertoimprovethequalityoflightingsysteminmachinevisionandobtainstableimagetheLEDlightingcontrollerbasedonUSBprotocolhasbeendesigned．ThelightingcontrollerusestheSTM32F107asmicro-controllerwhichisbasedonARMCortex-M3core．PWMDimmingtechnologyisappliedinordertoavoidthephe-nomenonofcolorcastinanalogdimming．Threelightingmodeshavebeendesignedincludingnormalmodestrobemodeandtriggermode．Theapplicationinmachinevisionshowsthatitcouldnotonlyreducesthecostbutalsodimsaccuratelyandimprovesthequalityoftheimage．KeywordsSTM32USB2．0protocollightingcontrollermachinevisionPWMdimming3653LED