LPC MicrocontrollersのトピックShared SWD-bus (multi-drop) https://community.nxp.com/t5/LPC-Microcontrollers/Shared-SWD-bus-multi-drop/m-p/529548#M9832 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Harrie on Thu Feb 18 05:31:59 MST 2016</STRONG><BR /><SPAN>Without result so far, I have made several attempts to share a single SWD-bus to debug two LPC11Cxx MCUs.</SPAN><BR /><BR /><SPAN>Debugging in LPCXpresso works fine with a single MCU on the PCB, however when the second MCU is added the I get the following error.</SPAN><BR /><BR /><I>[color=#f00]Target error from Register access: Nn(05). ACK Fault<BR />terminating on communication loss: Pipe has been closed by GDB.[/color]</I><BR /><BR /><SPAN>If possible, I would like to know how to create a shared SWD-bus as discribed in the link below?</SPAN><BR /><BR /><A href="http://http://web.archive.org/web/20150321140036/http://www.arm.com/files/pdf/Low_Pin-Count_Debug_Interfaces_for_Multi-device_Systems.pdf">http://web.archive.org/web/20150321140036/http://www.arm.com/files/pdf/Low_Pin-Count_Debug_Interfaces_for_Multi-device_Systems.pdf</A></BODY></HTML> Wed, 15 Jun 2016 19:27:59 GMT lpcware 2016-06-15T19:27:59Z Shared SWD-bus (multi-drop) https://community.nxp.com/t5/LPC-Microcontrollers/Shared-SWD-bus-multi-drop/m-p/529548#M9832 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by Harrie on Thu Feb 18 05:31:59 MST 2016</STRONG><BR /><SPAN>Without result so far, I have made several attempts to share a single SWD-bus to debug two LPC11Cxx MCUs.</SPAN><BR /><BR /><SPAN>Debugging in LPCXpresso works fine with a single MCU on the PCB, however when the second MCU is added the I get the following error.</SPAN><BR /><BR /><I>[color=#f00]Target error from Register access: Nn(05). ACK Fault<BR />terminating on communication loss: Pipe has been closed by GDB.[/color]</I><BR /><BR /><SPAN>If possible, I would like to know how to create a shared SWD-bus as discribed in the link below?</SPAN><BR /><BR /><A href="http://http://web.archive.org/web/20150321140036/http://www.arm.com/files/pdf/Low_Pin-Count_Debug_Interfaces_for_Multi-device_Systems.pdf">http://web.archive.org/web/20150321140036/http://www.arm.com/files/pdf/Low_Pin-Count_Debug_Interfaces_for_Multi-device_Systems.pdf</A></BODY></HTML> Wed, 15 Jun 2016 19:27:59 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Shared-SWD-bus-multi-drop/m-p/529548#M9832 lpcware 2016-06-15T19:27:59Z Re: Shared SWD-bus (multi-drop) https://community.nxp.com/t5/LPC-Microcontrollers/Shared-SWD-bus-multi-drop/m-p/529549#M9833 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by TheFallGuy on Thu Feb 18 05:51:45 MST 2016</STRONG><BR /><SPAN>Multi-drop SWD is not supported in standard Cortex-M0, M3 and M4 parts. According to this ARM article:</SPAN><BR /><SPAN><A class="jive-link-external-small" href="https://community.nxp.com/external-link.jspa?url=http%3A%2F%2Finfocenter.arm.com%2Fhelp%2Findex.jsp%3Ftopic%3D%2Fcom.arm.doc.faqs%2Fka16814.html" rel="nofollow" target="_blank">http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka16814.html</A></SPAN><BR /><SPAN>The chip vendor (i.e NXP) needs to license (and therefore implement in silicon) an additional component. AFAIK, NXP has not...</SPAN><BR /></BODY></HTML> Wed, 15 Jun 2016 19:27:59 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Shared-SWD-bus-multi-drop/m-p/529549#M9833 lpcware 2016-06-15T19:27:59Z