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TMS320F28335: TMS320F28335PGFA CA和TMS320F28335PGFA G4A的区别

Part Number: TMS320F28335


目前应用了两版DSP,分别为TMS320F28335PGFA CA和TMS320F28335PGFA G4A,遇到的问题是串口通信(RS232)程序在TMS320F28335PGFA CA运行正常,可以与上位机进行正常通信,但是同一版程序在TMS320F28335PGFA G4A上运行就无法与上位机进行正常通信。但是两个芯片都能实现串口下载程序功能,所以可以推断串口外围硬件电路是没有问题的。请问如何解决此问题?两个版本的DSP有什么区别?