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FT4222HQ-R 用户编程技术手册 - FTDI Chip（飞特帝亚）
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FTDI Chip（飞特帝亚）
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USB芯片
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FT4222HQ-R数据手册
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Copyright © 2008 Future Technology Devices International Limited 1
Document Reference No.: FT_000078
FTDI Device EEPROM Programming Using a Vinculum VNC1L Application Note AN_105
Version 1.00
Clearance No.:
FTDI# 59
Table of Contents
1
Introduction............................................................................................ 2
1.1
Conventions ......................................................................................................... 2
1.2
Acronyms and Abbreviations ............................................................................. 3
2
Project Setup ......................................................................................... 4
2.1
Hardware Setup ................................................................................................... 4
2.2
Software Setup .................................................................................................... 5
2.2.1
TTL-232R-3V3 Drivers ............................................................................................................ 5
2.2.2
VNC1L Firmware ..................................................................................................................... 5
2.2.3
Alternative Application Code ................................................................................................... 5
3
EEPROM Firmware Commands ............................................................ 6
3.1
FTDI Erase EEPROM (FEE) ................................................................................. 6
3.2
Write EEPROM (FEW) .......................................................................................... 6
3.3
Read EEPROM (FER) ........................................................................................... 6
4
Application Code ................................................................................... 7
4.1
Subroutines for Setting up and Connecting to the TTL-232R-3V3 .................. 7
4.2
Subroutines for Setting up the VNC1L .............................................................. 7
4.2.1
Queue Status ........................................................................................................................... 8
4.2.2
Read Responses from VNC1L ................................................................................................ 8
4.2.3
Write Firmware commands to VNC1L ..................................................................................... 9
4.2.4
Shortened Command Set command (SCS) .......................................................................... 10
4.2.5
Firmware Version command (FWV) ...................................................................................... 10
4.2.6
Query Port command (QP) .................................................................................................... 10
4.2.7
Select Interface command (SC) ............................................................................................ 11
4.2.8
Query Device command (QD) ............................................................................................... 11
4.3
Subroutines for Reading and Writing to the EEPROM ................................... 13
4.3.1
Reading from an EEPROM (FER) ......................................................................................... 13
4.3.2
Writing to an EEPROM (FEW) .............................................................................................. 14
4.3.3
Writing to the EEPROM of an FTxxxR chip ........................................................................... 15
4.3.4
Checksum .............................................................................................................................. 17
5
Contact Information............................................................................. 18
Appendix A - References .......................................................................... 19
Appendix B - Revision History .................................................................. 20
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