ISP syncronization impossible at 115200bps

Discussion created by lpcware Employee on Jun 15, 2016
Latest reply on Jun 15, 2016 by lpcware
Content originally posted in LPCWare by giusloq on Wed Jul 22 06:58:17 MST 2015
I have a LPC1778 and I'm trying to use the ISP for programming through serial port.

I can program the Flash correctly at 57600bps, but it is impossible at 115200bps. When I send sync char ('?'), I receive back from the MCU strange bytes and the the "Syncronized" ASCII word.

Another question. Why must I send the oscillator frequency to the MCU during sync sequence? I think the MCU knows very well its "default" oscillator frequency at startup and during ISP (12MHz for LPC1778).