ISP over RS-485?

[lpcware]

Content originally posted in LPCWare by jdupre on Tue Aug 04 12:56:47 MST 2015
Is it possible to use ISP mode at boot if an RS-485 transceiver is on the ISP UART?  If so, how does one control the direction (TxEnable) so an autobaud response can be sent?

The LPC2xxx has a means to control this via the reset and ISP entry pins.  But the LPC15xx has two ISP entry pins and I find no mention of the ISP code being able to control RTS in the manual.

- Joe

[lpcware]

Content originally posted in LPCWare by jdupre on Thu Aug 13 21:56:04 MST 2015
No comment?  Is it impossible for the ISP ROM & hardware in the LPC15xx to signal TxEnable for an RS-485 transceiver?

Looks like I can do it with IAP, but it sure would be better to have this possible with the ISP interface.