bootloader does not work..

[ScaleRobotics]

What speed crystal are you using on your PIC16F877a, and which hex file are you using? Do you have a schematic of your PIC16 chip setup?

[bmmilk]

What speed crystal are you using on your PIC16F877a, and which hex file are you using? Do you have a schematic of your PIC16 chip setup?

I'm using 4MHZ crystal. the hex file is tinybld_16F876A_04MHz.
ooppss,i dont have schematic of my pic setup.but it works well when i use a programmer to program instead of trying to build a bootloader.

[ScaleRobotics]

Hi bmmilk,

i dont have schematic of my pic setup.but it works well when i use a programmer to program instead of trying to build a bootloader.

So, when you program it with a programmer, you can get you code to work with your setup?

I have used the Tiny Bootloader on the same chip, with a RS232 to USB converter and had it work for me. It sounds like you are doing everything else right, so I suspect the wiring. How about a picture of your setup?

[bmmilk]

Hi bmmilk,



So, when you program it with a programmer, you can get you code to work with your setup?

I have used the Tiny Bootloader on the same chip, with a RS232 to USB converter and had it work for me. It sounds like you are doing everything else right, so I suspect the wiring. How about a picture of your setup?

Hi bmmilk,



So, when you program it with a programmer, you can get you code to work with your setup?

I have used the Tiny Bootloader on the same chip, with a RS232 to USB converter and had it work for me. It sounds like you are doing everything else right, so I suspect the wiring. How about a picture of your setup?

@ScaleRobotics:
ya when i program with an external programmer my code can function with the hardware.I hv posted 4 pictures of my connection of max232 and also pic16f877a.i doubt that if my connection is correct is it my usb serial converter spoil or cant work.i dont know.
here are the pictures,feel free to help me check ya...thank you a lot^^


http://bmmilk.blogspot.com/2011/10/blog-post_15.html