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Bus Pirate

Configuration

$ cat /etc/udev/rules.d/53-lattice-ftdi.rules
SUBSYSTEM=="tty", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6001", ATTRS{serial}=="A10KM11W", MODE="0660", SYMLINK+="buspirate"

Usage

After the Bus Pirate (BP) as been connected using the USB cable we should be able to connect to it usign minicom:

$ minicom -b 115200 -8 -D /dev/buspirate
?
General                                 Protocol interaction
---------------------------------------------------------------------------
?       This help                       (0)     List current macros
=X/|X   Converts X/reverse X            (x)     Macro x
~       Selftest                        [       Start
#       Reset                           ]       Stop
$       Jump to bootloader              {       Start with read
&/%     Delay 1 us/ms                   }       Stop
a/A/@   AUXPIN (low/HI/READ)            "abc"   Send string
b       Set baudrate                    123
c/C     AUX assignment (aux/CS)         0x123
d/D     Measure ADC (once/CONT.)        0b110   Send value
f       Measure frequency               r       Read
g/S     Generate PWM/Servo              /       CLK hi
h       Commandhistory                  \       CLK lo
i       Versioninfo/statusinfo          ^       CLK tick
l/L     Bitorder (msb/LSB)              -       DAT hi
m       Change mode                     _       DAT lo
o       Set output type                 .       DAT read
p/P     Pullup resistors (off/ON)       !       Bit read
s       Script engine                   :       Repeat e.g. r:10
v       Show volts/states               .       Bits to read/write e.g. 0x55.2
w/W     PSU (off/ON)            <x>/<x= >/<0>   Usermacro x/assign x/list all

The ? is a command which is sent to BP.

We can check the version of BP that I have:

HiZ>i
Bus Pirate v3b
Firmware v5.10 (r559)  Bootloader v4.4
DEVID:0x0447 REVID:0x3046 (24FJ64GA002 B8)
http://dangerousprototypes.com

The default baud rate for 3.0 and higher is 2M, and otherwise should be set to 115200.

When I got this device I wanted to use the 3.3V pin to power an iCE40HZ8K-EVB but I was not able to get it to work.

After reading through the user manual I noticed that the on-board power supply needs to be activated first:

HiZ>m
1. HiZ
2. 1-WIRE
3. UART
4. I2C
5. SPI
6. 2WIRE
7. 3WIRE
8. LCD
9. DIO
x. exit(without change)
Ready
SPI>W
Power supplies ON
SPI>

HiZ stands for high impedance mode (HiZ) which is a a safe mode with all outputs disabled.

After doing that I can see the Mode led is on as is the VREG led is also on, and with the oscilloscope we can verify the voltage is indeed now 3.3V:

Bus Pirate image

Probe

$ flashrom -p buspirate_spi:dev=/dev/ttyUSB0
flashrom v1.2 on Linux 5.13.14-200.fc34.x86_64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Bus Pirate firmware 6.1 and older does not support SPI speeds above 2 MHz. Limiting speed to 2 MHz.
It is recommended to upgrade to firmware 6.2 or newer.
Found Eon flash chip "EN25QH16" (2048 kB, SPI) on buspirate_spi.

Reading from flash

$ flashrom -p buspirate_spi:dev=/dev/ttyUSB0,spispeed=1M -r original.bin -V

Troubleshooting

flashrom -p buspirate_spi:dev=/dev/ttyUSB0,spispeed=1M -w blinky.bin
flashrom v1.2 on Linux 5.13.14-200.fc34.x86_64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found Eon flash chip "unknown Eon SPI chip" (0 kB, SPI) on buspirate_spi.
===
This flash part has status NOT WORKING for operations: PROBE READ ERASE WRITE
The test status of this chip may have been updated in the latest development
version of flashrom. If you are running the latest development version,
please email a report to [email protected] if any of the above operations
work correctly for you with this flash chip. Please include the flashrom log
file for all operations you tested (see the man page for details), and mention
which mainboard or programmer you tested in the subject line.
Thanks for your help!
Error: Image size (135100 B) doesn't match the flash chip's size (0 B)!
make: *** [Makefile:33: blinky_flash_rom] Error 1

In this case the issue is that Bus Pirate had not been configured and in SPI mode.

flashrom -p buspirate_spi:dev=/dev/ttyUSB0,spispeed=1M -w blinky.bin
flashrom v1.2 on Linux 5.13.14-200.fc34.x86_64 (x86_64)
flashrom is free software, get the source code at https://flashrom.org

Using clock_gettime for delay loops (clk_id: 1, resolution: 1ns).
Found Eon flash chip "EN25QH16" (2048 kB, SPI) on buspirate_spi.
Error: Image size (135100 B) doesn't match the flash chip's size (2097152 B)!
make: *** [Makefile:33: blinky_flash_rom] Error 1

This is because the Flash size is 2048 kB and the image that we are trying to flash it will does not have that size. We can pad it to that size though.