bootloader does not work..

[ScaleRobotics]

Thanks Sylvio,

It looks like TX pin 11 of the Max232 chip (red wire) is going to the RX pin of the PIC chip. In this case RX should go to RX and TX should go to TX.

[bmmilk]

Thanks Sylvio,

It looks like TX pin 11 of the Max232 chip (red wire) is going to the RX pin of the PIC chip. In this case RX should go to RX and TX should go to TX.

Attachment 6059

ya,I changed the connection.but now the bootloader show this when i tried to write flash


Connected to \\.\COM4 at 9600
HEX: 3052 days old, INHX8M,16Fcode+cfg, total=200 bytes.
Searching for PIC ...Not found,
ERROR!


so what can i do with this?thank you

[supratik]

bmmilk,
Can you check the following things

1. You are supposed to use the programmer to download the tinybld_xxxxx.hex file. Once it is done the chip will learn how to talk with tiny bootloader using serial port. After that you should be able to use serial port to download your own program (try with some blinky program).

2. If you are using electrolytic capacitor for MAX232 check the polarity of the caps. A single reverse caps can create those problems.

3. PIN 11 of MAX232 should go to RC6 and PIN 12 to RC7 of uC.

4. PIN 13 and 14 of MAX232 should go to Tx (pin 3) and Rx (pin 2) of serial port (DB9).

5. Make sure you have the right baud rate. It should be defined in the .asm file.