ReAl

Час від часу зустрічаю запитання по відмінностях між цими мікросхемами. В описах чи відкритих проектах в інтернеті згадується FT2232C, а в продажу зараз є FT2232D. Виникають сумніви у сумісності програм та адаптерів.
Як це часто буває, всі ці сумніви розвіюються при перегляді сторінки опису FT2232D. Але чомусь багатьом легше не подивитися на сайті виробника, а спитати на форумі чи набрати рядок «різниця FT2232C та FT2232D» в пошуковику. Ну що ж, ось він, цей рядок для нього, хай йому буде легше

Документації на старіші версії мікросхем на сайті вже немає, але безпосередньо на сторінці сказано:

The FT2232D is the 3rd generation of FTDI’s popular USB UART/FIFO IC. The FT2232D is an updated version of the FT2232C and its lead free version, the FT2232L. Please note that the FT2232D is not an new generation of device.

The FT2232D is lead free and pin compatible with the original FT2232C and FT2232L devices. All the original device features are supported with some additional features available including a CPU-style FIFO mode and an extended operating temperature range.

»»» І що ж все це означає?

Some of FTDI USB converter chips have MPSSE — hardware engine for implementation of serial interfaces like JTAG, SPI, I2C. FT2232D and previous versions FT2232C, FT2232L support Full-Bandwidth USB and have upper TCK/SCK frequency level 6 MHz. FT2232H, FT4232H, FT232H work in USB 2.0 Hi-Speed mode and have 30 MHz limit.

MPSSE defines DBUS0..DBUS2 as TCK/SCK, TDI/MOSI and TDO/MISO. AVR ISP interface requires RESET signal. DBUS3 (TMS/CS) can be used for this purpose and AVReAl uses it by default.

»»» Read more about MPSSE and AVReAl

avreal v1.28r9 (Tue 2011-12-20) has been released.

• FT232H MPSSE mode support added.
• Delays processing in Windows version changed: lower CPU load for -k/-K switches.
• Resynchronisation method changed for all microcontrollers.
  Resync process started with one attempt of RESET pulse method then continued with SCK pulse method.
  More about synchronisation.

AVR ISP-programming starts with RESET activation following by transmitting of programming enable instruction. Entry sequence requirement is that SCK must be set to ’0′ during RESET activation. Otherwise SCK falling edge causes unintended programming hardware state change.

The falling edge distorts 4-byte programming instruction. The microcontroller does not recognise it and does not enter programming mode. There is no sense to send programming entry instruction again because byte-level command’s phase is shifted by one SCK period. The last SCK pulse of previous instruction will act as extra pulse for subsequent command.

Synchronisation can also be corrupted during programming process. Read more in publication about AVReAl “synchronisation lost” message.

Atmel datasheets describe two methods for synchronisation recovery.

»»» Read more about resynchronisation[/lаng_en]

avreal beta-version 1.28r9b1 with FT232H support has been released.
Please, test it.

avreal v.1.28r8 and older ones were built for FreeBSD 6.4.
avreal1.28r8 was rebuilt for FreeBSD 8.2 then tested and uploaded to avreal download page.

All future versions will be built for FreeBSD 8.2 only.

avreal v1.28r8 (Sat 2011-08-13) has been released.

• Raw binary file support is added.
  Binary files are denoted by :bin: prefix in file name.
• -r switch behavior is changed.
  -r+ forces writing full memory content into output file (“old” behavior of -r).
  When -r is used, rows which contain only FF bytes in data field will not be written into :ihex: output file. FF-only tail will not be written into :bin: file.

As it was published before 64-bit libftd2xx.so libraries version 1.0.0 and above are not compatible with earlier ones. There are no problems with 32-bit libraries.
It is necessary to install old libftd2xx package for 64-bit avreal/Linux. The package can be downloaded from here.
AVReAl beginning from 1.28r6 loads the library by name libftd2xx.so.0 but not libftd2xx.so. That allows to install both library versions.
Let review installation process.

Continue reading ‘How to install two versions of libftd2xx’ »

From AVReAl‘s point of view there are two Windows families.

Windows 9X family OS like Windows 98 does not require LPT access driver. avreal uses direct IO access when working in it.

NT-line OS like Windows XP or Windows 7 requires a DLPortIO driver. Driver installation process for 32-bit and 64-bit OS has been described before.

For all Windows versions parallel port number or base address must be set in command line, for example -p1, -p378. Port number is just alias for standard address as it is noted in -p switch description. Fixed 378/278/3BC addresses are used for LPT1/2/3.

Non-standard base address for PCI-LPT extension board can be found on port properties tab in device manager.

»»» How to see the address of LPT in Windows

avreal v1.28r7 (Sun 2011-02-27) has been released.

• -v+ processing error — fixed.