Merge pull request #257 from dbuezas/fix-isp

Changes extended_fuses from 0x07 to 0xff as indicated by newer avrdude

lgt8f/boards.txt

@@ -21,7 +21,7 @@ menu.upload_speed=Upload speed
 328.bootloader.tool=avrdude
 328.bootloader.high_fuses=0xff
 328.bootloader.low_fuses=0xff
-328.bootloader.extended_fuses=0x07
+328.bootloader.extended_fuses=0xff
 328.bootloader.unlock_bits=0x3f
 328.bootloader.lock_bits=0x3f
 328.build.core=lgt8f
@@ -109,7 +109,7 @@ menu.upload_speed=Upload speed
 328_16.bootloader.tool=avrdude
 328_16.bootloader.high_fuses=0xff
 328_16.bootloader.low_fuses=0xff
-328_16.bootloader.extended_fuses=0x07
+328_16.bootloader.extended_fuses=0xff
 328_16.bootloader.unlock_bits=0x3f
 328_16.bootloader.lock_bits=0x3f
 328_16.build.core=lgt8f
@@ -229,7 +229,7 @@ menu.upload_speed=Upload speed
 328_12.bootloader.tool=avrdude
 328_12.bootloader.high_fuses=0xff
 328_12.bootloader.low_fuses=0xff
-328_12.bootloader.extended_fuses=0x07
+328_12.bootloader.extended_fuses=0xff
 328_12.bootloader.unlock_bits=0x3f
 328_12.bootloader.lock_bits=0x3f
 328_12.build.core=lgt8f
@@ -333,7 +333,7 @@ menu.upload_speed=Upload speed
 #88.bootloader.tool=avrdude
 #88.bootloader.high_fuses=0xff
 #88.bootloader.low_fuses=0xff
-#88.bootloader.extended_fuses=0x07
+#88.bootloader.extended_fuses=0xff
 #88.bootloader.unlock_bits=0x3f
 #88.bootloader.lock_bits=0x3f
 #88.build.mcu=atmega88
@@ -378,7 +378,7 @@ lardu_328e.upload.speed=57600
 lardu_328e.bootloader.tool=avrdude
 lardu_328e.bootloader.high_fuses=0xff
 lardu_328e.bootloader.low_fuses=0xff
-lardu_328e.bootloader.extended_fuses=0x07
+lardu_328e.bootloader.extended_fuses=0xff
 lardu_328e.bootloader.path=lgt8fx8e
 lardu_328e.bootloader.file=lgt8fx8e\optiboot_lgt8f328d.hex
 lardu_328e.bootloader.unlock_bits=0x3f

lgt8f/libraries/LarduinoISP/readme.md

@@ -12,28 +12,39 @@ This is an implementation of LGT8Fx8P ISP download protocol. You can make arduin
 
 ## usage
 
-1. Make a LGTISP:
-   1. Select SERIAL_RX_BUFFER_SIZE to 250 in Menu: Tools/Arduino as ISP/SERIAL_RX_BUFFER_SIZE to 250
-   2. Burn LGTISP into another LGT328p board.
-   3. Select Default in Menu: Tools/Arduino as ISP/Default
-   4. Short `RESET` pin and `VCC` pin of ISP board to avoid bootloader executing.
-   5. The board becomes a LGTISP now! Connect `SWD` and `SWC`. `RST` can be either connect or not.
+1. Prepare a board to use as Programmer:
+   1. In the menu select: `Tools`/`Arduino as ISP`/`SERIAL_RX_BUFFER_SIZE to 250`
+   2. Open `File`/`Examples`/`LarduinoISP`/`LarduinoISP`
+   3. Upload the sketch.
+   4. Go back to normal serial buffer size: `Tools`/`Arduino as ISP`/`Default`
+   5. Put a capacitor (e.g 10uF) between the `RESET` pin and `VCC` pin of ISP board to resets while uploading. Alternatively, short `RESET` and `VCC`, but make sure to NOT press the reset button in the board.
+   6. Congratulations, you have a LGTISP Programmer now!
+2. Connect the programmer to the target board
+   1. Connect `SWD` and `SWC`. `RST` can be either connect or not.
       | Arduino Nano || LGT |
       |:-:|:-:|:-:|
       | D13 | -> | SWC |
       | D12 | -> | SWD |
       | D10 | -> | RST |
-2. Burn bootloader into LGT8Fx8P:
+3. Burn bootloader into LGT8Fx8P:
    1. change **Programmer** to **AVR ISP**.
    2. click **Burn Bootloader** or upload sketches directly through the menu: **Sketch/Upload using programmer**
+   3. Now the target board can receive sketches via serial
+4. Burn sketches directly through the programmer:
+   1. Open the desired sketch
+   2. Configure the board from `Tools` as normal
+   3. Change **Programmer** to **AVR ISP**.
+   4. With everything wired, in the menu go to `Sketch`/`Upload using Programmer` (alternatively hold shift while clicking the upload button)
+   5. Congratulations! the sketch is now uploaded without a bootloader! Uploading via serial should't be possible anymore on that board (unless you Burn the bootloader again)
 
 ## Guide
 
 [rickygai](https://github.com/rickygai) created a very detailed guide [here](https://github.com/rickygai/arduino/blob/main/LGT8F328P.pdf)
 
 ## author
 
-brother_yan
+ISP code: brother_yan
+This page: dbuezas
 
 ## reference