JTAG仅作JTAG使用，未作GPIO用。有时可以连接上用IAR下载调试，有时一直连不上。什么原因？是硬件JTAG接口损坏？
Thu Sep 29, 2011 15:02:18: Loaded macro file: D:Program FilesIAR SystemsEmbedded Workbench 6.0 KickstartarmconfigflashloaderTexasInstrumentsFlashLM3Sxxx.mac
Thu Sep 29, 2011 15:02:19: JTAG Speed is set to: 500 kHz
Thu Sep 29, 2011 15:02:21: Fatal error: **ERROR**: JTAG initialization failed 0x00000004   Session aborted!
Thu Sep 29, 2011 15:02:21: Failed to load flash loader: D:Program FilesIAR SystemsEmbedded Workbench 6.0 KickstartarmconfigflashloaderTexasInstrumentsFlashLM3SxxxRAM16K.out
Thu Sep 29, 2011 15:02:21: Failed to load flash loader: D:Program FilesIAR SystemsEmbedded Workbench 6.0 KickstartarmconfigflashloaderTexasInstrumentsFlashLM3Sx6xx.flash 此帖出自小平头技术问答