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Hello,

I think the problem causing the compilation error is the Flowcode project file name, it's been reported before. Try shortening the name and getting rid of the brackets.
viewtopic.php?f=63&t=17965&p=76175#p76151

Hello,
Thanks for info. I give a short FC project file name (MBSlaveLCD16.fcfx) , compiler gives me the following , no data at lcd when I send some characters ( emulator gives me response error). LCD works fine when I change the MCU with a PIC16F1939(with the same code).

Launching the compiler...
C:\Program Files (x86)\Flowcode 7\compilers\pic\bin\xc8.exe --chip=18F458 "MBSlaveLCD16.c" --MSGDISABLE=359,1273,1388
Microchip MPLAB XC8 C Compiler (Free Mode) V1.38
Build date: Jun 30 2016
Part Support Version: 1.38
Copyright (C) 2016 Microchip Technology Inc.
License type: Node Configuration
Employing 18F458 errata work-arounds:
* Address 4000h boundary
* Faulty table reads at -40 degrees C
* GOTO instruction at reset vector must be preceded by NOP
* Peripherals can misbehave if BSR = 15
* DAW instruction may improperly clear CARRY bit
* Writes to flash must target opposite side of 4000h boundary
MBSlaveLCD16.c:
37: __config("__PROG_CONFIG", "pic18", 0x3, 0xFFFF);
^ (0) Can't find config word 3 used in in __PROG_CONFIG() (warning)

Are configuration settings correct? Below I post the file . Thanks.

Hello,

To sanity check your configuration settings use the 1 second flasher method, it works really well and is a nice double check that everything is right. I cannot really double check your config settings are valid without knowing the details of your hardware.

It looks to me from your project like you have a 16MHz crystal connected to the oscillator pins. The other config settings look fine though the power up timer can be useful if you want to enable this.

37: __config("__PROG_CONFIG", "pic18", 0x3, 0xFFFF);
^ (0) Can't find config word 3 used in in __PROG_CONFIG() (warning)

This can be safely ignored.

The other warnings are just telling you about workarounds the compiler is doing to get around known problems with the silicone.

Making some tests with flasher method , I note that the code with PIC18F458 don't start and therefore not run , while with PIC16F1939 works fine , I don't know why. Is there an error at code , or hardware needs modification? Hardware is simple , I don't think that there is a reason for modification . Is there a way to check the code for errors? Below I post a sketch of schematic for your opinion.

Hello,

From your schematic it looks like you're missing a resistor between pin 1 of the micro and VCC to pull the MCLR/Reset pin high. A value in the range of 1K to 100K should work well.

The 16F1937 has a configuration option for internal MCLR but the 18F458 does not which maybe explains the difference.

I connect a pull-up resistor 10K between pin1 and VDD , so the mcu works fine . Many thanks Ben !