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LPC 822 ISP Write to RAM echoes correctly, but OK response never received!

Question asked by lpcware Employee on Jun 15, 2016
Latest reply on Jul 6, 2017 by Andreas Schnitzer
Content originally posted in LPCWare by schoeler on Mon Apr 11 17:39:15 MST 2016
According to 25.6.1.4 of LPC82X_UM10800, after a command with an acceptable address, length, and count is received, the LPC will respond with CMD_SUCCESS ("0").  At this point, the host then sends a length amount of bytes, and the LPC should respond with "OK<CR><LF>".

There have been some instances of the OK<CR><LF> not occuring, but no confirmation from NXP (for example, https://www.lpcware.com/content/forum/error-isp-lpc812-lost-characters-when-sending-bytes-too-fast-lpc812-command-w#comment-1145095 comment 14).  This is not listed in the Errata sheet Rev 1.1. 

Has anyone else seen this issue?

Even though there is no return code, a READ from the same location returns all the values I have sent.  So I know the data is in RAM, but there just seems to be no return code, contrary to what is stated in the manual.

Thanks.

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