參考資訊：
http://www.gammon.com.au/uno
https://www.arduino.cc/en/Tutorial/ArduinoISP
http://irq5.io/2017/07/25/making-usbasp-chinese-clones-usable/
https://www.deviantart.com/mortenaaserud/art/Digispark-Attiny85-Pinout-738150591
USB ISP目前只能搭配ProgISP使用，而這個軟體目前只能在Windows下使用，最可惜的是avrdude竟然不支援USB ISP燒錄器，於是司徒花了一些時間上網找了一下資料，發現國外有人透過硬體跳線解決，但是這畢竟比較麻煩一點，最好可以透過韌體解決，幸運地，司徒最終找到分享的資源，過程說明如下：
PCB正面(Atmega88)
PCB背面
因為需要透過Arduino Uno更新USB ISP(變成USBasp)韌體，因此，必須先把Arduino Uno變成一台燒錄器
確定Port
燒錄
接著連接USB ISP和Arduino Uno(腳位如下)：
| Arduino UNO | USB ISP |
|---|---|
| SCK | SCK |
| VCC | VCC |
| GND | GND |
| MISO | MISO |
| MOSI | MOSI |
| Pin10 | Reset |
| RESET | 10uF |
在燒錄時，USB ISP Reset腳位必須手動連接
usbasp.atmega88.2011-05-28.hex
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Patch USBasp Firmare(185行)改成如下：
:100B8000D9F77A9589F708951BB815B880EF8AB917
燒錄Patch Firmware(patch.hex)
$ sudo apt-get update
$ sudo apt-get install avrdude
$ sudo avrdude -vv -c stk500v1 -b 19200 -P /dev/ttyACM0 -p m88 -U flash:w:patch.hex:i
avrdude: Version 6.3, compiled on Nov 8 2018 at 17:56:23
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "/usr/local/etc/avrdude.conf"
User configuration file is "/root/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : /dev/ttyACM0
Using Programmer : stk500v1
Overriding Baud Rate : 19200
AVR Part : ATmega88
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 512 4 0 3600 3600 0xff 0xff
flash 65 6 64 0 yes 8192 64 128 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : STK500
Description : Atmel STK500 Version 1.x firmware
Hardware Version: 2
Firmware Version: 1.18
Topcard : Unknown
Vtarget : 0.0 V
Varef : 0.0 V
Oscillator : Off
SCK period : 0.1 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.03s
avrdude: Device signature = 0x1e930a (probably m88)
avrdude: safemode: hfuse reads as DD
avrdude: safemode: efuse reads as F9
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "patch.hex"
avrdude: writing flash (4716 bytes):
Writing | ################################################## | 100% 6.67s
avrdude: 4716 bytes of flash written
avrdude: verifying flash memory against patch.hex:
avrdude: load data flash data from input file patch.hex:
avrdude: input file patch.hex contains 4716 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 3.34s
avrdude: verifying ...
avrdude: 4716 bytes of flash verified
avrdude: safemode: hfuse reads as DD
avrdude: safemode: efuse reads as F9
avrdude: safemode: Fuses OK (E:F9, H:DD, L:FF)
avrdude done. Thank you.
完成後的LED會變成藍色(原本是紅色)
接著測試一下USB ISP燒錄功能
| USB ISP | ATtiny85 |
|---|---|
| VCC | 5V |
| GND | GND |
| RST | PB5 |
| SCK | PB2 |
| MISO | PB1 |
| MOSI | PB0 |
main.hex
:100000000EC015C014C013C012C011C010C00FC064 :100010000EC00DC00CC00BC00AC009C008C011241E :100020001FBECFE5D2E0DEBFCDBF02D018C0E8CF03 :1000300082E087BB88BB2FE936E891E02150304051 :100040009040E1F700C0000018BA2FE936E891E0CF :10005000215030409040E1F700C00000EBCFF89411 :02006000FFCFD0 :00000001FF
燒錄
$ sudo avrdude -vv -c usbasp -p t85 -U flash:w:main.hex:i
avrdude: Version 6.3, compiled on Nov 8 2018 at 17:56:23
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "/usr/local/etc/avrdude.conf"
User configuration file is "/root/.avrduderc"
User configuration file does not exist or is not a regular file, skipping
Using Port : usb
Using Programmer : usbasp
avrdude: seen device from vendor ->www.fischl.de<-
avrdude: seen product ->USBasp<-
AVR Part : ATtiny85
Chip Erase delay : 4500 us
PAGEL : P00
BS2 : P00
RESET disposition : possible i/o
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 6 4 0 no 512 4 0 4000 4500 0xff 0xff
flash 65 6 32 0 yes 8192 64 128 4500 4500 0xff 0xff
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
lock 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
lfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
efuse 0 0 0 0 no 1 0 0 9000 9000 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
Programmer Type : usbasp
Description : USBasp, http://www.fischl.de/usbasp/
avrdude: auto set sck period (because given equals null)
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e930b (probably t85)
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FF
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: auto set sck period (because given equals null)
avrdude: reading input file "main.hex"
avrdude: writing flash (98 bytes):
Writing | ################################################## | 100% 0.08s
avrdude: 98 bytes of flash written
avrdude: verifying flash memory against main.hex:
avrdude: load data flash data from input file main.hex:
avrdude: input file main.hex contains 98 bytes
avrdude: reading on-chip flash data:
Reading | ################################################## | 100% 0.05s
avrdude: verifying ...
avrdude: 98 bytes of flash verified
avrdude: safemode: hfuse reads as DF
avrdude: safemode: efuse reads as FF
avrdude: safemode: Fuses OK (E:FF, H:DF, L:E2)
avrdude done. Thank you.