Bus Pirate v4 "VREG too low" but nothing is connected

Products & Technology Grove
#1

I’ve got my Bus Pirate v4. Self-test (~) runs ok and reports 0 errors. Here is the version:

$ sudo picocom /dev/ttyACM0
HiZ>i
Bus Pirate v4
Firmware v6.0-a3 
DEVID:0x1019 REVID:0x0004 (24FJ256GB106 UNK)
http://dangerousprototypes.com

However, when powering up (W) in SPI mode, I get “VREG too low”. NOTHING is connected to the board, just USB cable to the PC.

SPI>W
VREG too low, is there a short?
Power supplies OFF

When staring the bootloader from the menu, the connection closes before expected “BL4+” reply appears.

HiZ>$
Are you sure? y
BOOTLOADER

FATAL: read zero bytes from port
term_exitfunc: reset failed for dev UNKNOWN: Input/output error
(these two lines are from picocom terminal program)

I tried different USB cables and different USB ports.

I tried this firmware loader: https://github.com/mikebdp2/Bus_Pirate/tree/master/BPv4-bootloader/pirate-loader, WITH a jumper between PGND and PGC. It reports no or an invalid reply.

$ sudo ./pirate-loader --dev=/dev/ttyACM0 --hello
+++++++++++++++++++++++++++++++++++++++++++
  Pirate-Loader for BP with Bootloader v4+  
  Loader version: 1.0.3  OS: UNKNOWN
+++++++++++++++++++++++++++++++++++++++++++

Opening serial device /dev/ttyACM0...OK
Configuring serial port settings...OK
Sending Hello to the Bootloader...ERROR
No reply from the bootloader, or invalid reply received: 4
Please make sure that PGND and PGC are connected, reconnect
the device and try again
#2

The “VREF too low” disappeared after downloading github.com/mikebdp2/Bus_Pirate/blob/master/package_latest/BPv4/firmware/bpv4_fw7.0_opt3_18092016.hex. thx Alex R2AUK eax.me/bus-pirate/

I used powering on with a jumper between PGC and PGD to enter the bootloader. I don’t know if $ would have worked. pirate-loader (github_com/mikebdp2/Bus_Pirate/tree/master/BPv4-bootloader/pirate-loader) message “jumper between PGND and PGC” was misleading.

The bootloader is one-shot (dangerousprototypes_com/forum/index.php?topic=271.0). Replug USB after saying --hello.

$ sudo ./pirate-loader --dev=/dev/ttyACM0 --hello
+++++++++++++++++++++++++++++++++++++++++++
  Pirate-Loader for BP with Bootloader v4+
  Loader version: 1.0.3  OS: Linux
+++++++++++++++++++++++++++++++++++++++++++

Opening serial device /dev/ttyACM0...OK
Configuring serial port settings...OK
Sending Hello to the Bootloader...OK

Bootloader version: 4,06
Device ID [f1]:PIC24FJ256GB106

Replug USB (re-enter the bootloader)

$ sudo ./pirate-loader --dev=/dev/ttyACM0 --hex=bpv4_fw7.0_opt3_18092016.hex
+++++++++++++++++++++++++++++++++++++++++++
  Pirate-Loader for BP with Bootloader v4+
  Loader version: 1.0.3  OS: Linux
+++++++++++++++++++++++++++++++++++++++++++

Parsing HEX file [bpv4_fw7.0_opt3_18092016.hex]
Found 46212 words (138636 bytes)
Opening serial device /dev/ttyACM0...OK
Configuring serial port settings...OK
Sending Hello to the Bootloader...OK

Bootloader version: 4,06
Device ID [f1]:PIC24FJ256GB106
Erasing page 0, 0000...OK
Writing page 0 row 0, 0000...OK
. . .
Writing page 97 row 783, 18780...OK
Erasing page 170, 2a800...OK
. . .
Writing page 170 row 1367, 2ab80...(SKIPPED by bootloader)...OK

Firmware updated successfully :)!

“VREF too low” gone, “clutch engaged” appears:

$ sudo picocom /dev/ttyACM0
HiZ>i
Bus Pirate v4
Community Firmware v7.0 - goo.gl/gCzQnW [HiZ 1-WIRE UART I2C SPI 2WIRE 3WIRE KEYB LCD PIC DIO]
DEVID:0x1019 REVID:0x0004 (24FJ256GB106 UNK)
dangerousprototypes.com

HiZ>m
5. SPI
(1)>5
. . .
(1)>
Clutch disengaged!!!
To finish setup, start up the power supplies with command 'W'

Ready
SPI>W
POWER SUPPLIES ON
Clutch engaged!!!
SPI>