mirror of
https://git.code.sf.net/p/openocd/code
synced 2025-11-04 10:29:03 +00:00
aee495e785
add new i2c bit-banging feature, we can now connect in JTAG with the SoC target and in i2c with the main board components at the same time. Change-Id: I8e4516fe1ad5238e0373444f1c3c9bc0814d0f52 Signed-off-by: Ahmed BOUDJELIDA <aboudjelida@nanoxplore.com> Reviewed-on: https://review.openocd.org/c/openocd/+/7796 Tested-by: jenkins Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
38 lines
1.7 KiB
Plaintext
38 lines
1.7 KiB
Plaintext
#SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
This is the ANGIE firmware for ANGIE USB-JTAG adapter.
|
|
|
|
The main components of ANGIE adapter are:
|
|
- Cypress EZ-USB FX2 microcontroller
|
|
- Spartan-6 FPGA
|
|
- SRAM memory chip
|
|
- Pin headers for various JTAG pin assignments
|
|
|
|
To compile the firmware, the SDCC compiler package is required. Most Linux
|
|
distributions include SDCC in their official package repositories. The SDCC
|
|
source code can be found at http://sdcc.sourceforge.net/
|
|
|
|
Simply type "make bin" in the ANGIE directory to compile the firmware.
|
|
"make clean" will remove all generated files except the BIN file
|
|
required for downloading the firmware to ANGIE.
|
|
|
|
Note that the EZ-USB FX2 microcontroller does not have on-chip flash,
|
|
ANGIE include on-board EEPROM memory to store the firmware program of
|
|
the FX2, but we are not going to use this method.
|
|
|
|
Instead, upon initial connection of the ANGIE adapter to the host PC
|
|
via USB, the EZ-USB FX2 core has enough intelligence to act as a
|
|
stand-alone USB device, responding to USB control requests and allowing
|
|
firmware download via a special VENDOR-type control request. Then, the
|
|
EZ-USB microcontroller simulates a disconnect and re-connect to the USB bus.
|
|
It may take up to two seconds for the host to recognize the newly connected
|
|
device before OpenOCD can proceed to execute JTAG commands. This delay is
|
|
only visible when OpenOCD first uses a blank (unconfigured) ANGIE device.
|
|
|
|
Once the firmware downloaded, the FX2 microcontroller activate its GPIF mode,
|
|
download the Spartan-6 FPGA's bitstream, program the FPGA rapidly, and switch
|
|
back to default io mode.
|
|
|
|
Once the user disconnects the ANGIE adapter, all its memory contents are lost
|
|
and the firmware & bitstream download process has to be executed again.
|