18LF452 strangeness

Testing/Troubleshooting
1

Hi there

I have a strange(I think)  problem.

I have two 18F452’s programmed with the bootloader, and MIOS 1.9e . both of these work great.

I also have and 18LF452 programmed with the bootloader. If I program this chip with the MIDI loopback test, it works fine.

The bootloader programs fine, however when I try to upload MIOS via mios studio, I get the following errors :

Starting upload of mios_v1_9e_pic18f452.hex

Hex file contains code in MIOS range, forcing reboot!

Received Upload Request

Sending block 00000400-000004FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Error: Received unexpected Upload Request

Sending block 00000500-000005FF

Error: Received unexpected Upload Request

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Received Checksum: 0F - Error

Sending block 00000500-000005FF

Aborting after 16 errors

Any ideas ? Or should I be using a different bootloader for the 18LF series ?

Thanx

Thys

2

Re: MIOS Upload fails…

The LF should behave the same way as the F… Weird…

3

Yes, it should behave like a common PIC18F452

Maybe an issue with your programmer? Which one did you use? And did you perform a verify after programming the bootloader to check the flash content?

Maybe the code memory protection is activated, so that flash cannot be overwritten via software?

Best Regards, Thorsten.

4

Maybe an issue with your programmer? Which one did you use? And did you perform a verify after programming the bootloader to check the flash content?

I used a classic TAIT serial programmerand ICProg 1.05E , the same one I used to program the two working 18F452’s

I Also read back the contents and compared to the hex file, and all is OK

Maybe the code memory protection is activated, so that flash cannot be overwritten via software?

I have also verified that the code protection is the same as the others , Config 5 == C00F

Thanx

Thys

5

Hm, then I don’t have any ideal for the reason…

ICProg has a readout function, right? What has been written between 0x400 and 0x5ff?

Best Regards, Thorsten.