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doguhanpala
Joined: 05 Oct 2016 Posts: 120
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bootloader problem |
Posted: Tue Apr 09, 2019 3:56 am |
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Hello everyone,
I am newbie about bootloaders. I have read a few posts here. As i understand after the boodloader you can upload hex via usb or serial pins.
When the pic start up the bootloader checks for a message for a time period(if there is new hex) if there is no message it goes to the main function of the hex. If there is a message, writes the new hex.
First of all, is there any mistake (or mistakes probably) on the summary?
Secondly, i want to use the usb bootlader. I upload the ccs example code(i dont share it because of forum rules) but after that there is no communication. After usb communication the computer does not play usb voice and i cant see the hardware on device manager.
I checked about usb communication with a basic getc and putc function. I can send and see the chars via putty.
Any ideas about what am i doing wrong? |
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temtronic
Joined: 01 Jul 2010 Posts: 9174 Location: Greensville,Ontario
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Posted: Tue Apr 09, 2019 5:43 am |
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What version of Windows ? What other programs are running ?
What program did you download into the PIC ?
If the PIC program doesn't talk to the PC often, Windows will 'close' the USB port.
One of the bad things about USB is that it is NOT an interrupt driven serial port which the original comports were. It's 'polled' so whatever is attached to the PC USB HAS to access the PC on a regular basis to keep the USB comport 'open' or 'active'.
Jay |
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doguhanpala
Joined: 05 Oct 2016 Posts: 120
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Posted: Tue Apr 09, 2019 6:16 am |
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temtronic wrote: | what version of Windows/ What other programs are running.
What program did you download into the PIC ?
If the PIC program doesn't talk to the PC often, Windows will 'close' the USB port.
One of the bad things about USB is that it is NOT an interrupt driven serial port which the original comports were. It's 'polled' so whateve ris attacjed to the PC USB HAS to access the PC on a regular basis to keep the USB comport 'open' or 'active'.
Jay |
Hello Jay,
I use Windows 10. For uploading new hex, i tried picpgmboot and ccsbotloader.exe. When i checked device manager for usb ports, none of them was working though.
I downloaded the ex_usb_bootloader (i did not change anything).
About polling, even if i manage to connect once, i should send a data to usb port to keep it open if i am not mistaken.
Thank you for your answer. |
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