andreyk0 / power-supply-ieee488-gpib-controller

Control power supply over GPIB interface

power-supply-ieee488-gpib-controller

Control Agilent 6621A power supply over GPIB interface via AR488 serial adapter.

Interface

Info view

• button short press - both channels on/off
• button long press - file selector UI
• rotary encoder - adjust by 0.1 (V/I)
• rotary encoder (while pressed) - adjust by 1 (V/I)
• rotary encoder short press - flip between channels
• rotary encoder long press - flip between I/V adjustment

File view

• encoder scroll, press to run
• button cancel, back to info screen

SDCard

• BOOT file (root directory) is loaded on startup
• root directory is listed in the file selector screen (64 entries max, each 32 char max)

Example boot file.

Display

Repurposed Reprap controller board.

Pin assignments

See STM32 Cube project file and/or init code / types.rs.

GPIB Serial adapter

Forked snapshot of AR488 GPIB IEEE-488 serial adapter.

Connector: FTDI USB serial adapter.

Example picocom session

picocom --baud 115200 --imap lfcrlf --echo /dev/ttyUSB0

Default address / print command results

++addr 5
++auto 1

Send some commands

id?
HP6621A

sts? 1
  1

err?
  6

test?
  0

vset 1 1.2; vset 2 2.3

Interface: 4wire (Gnd, Vcc, Rx, Tx), 115200, no flow control.

Signal levels: TTL 3.3V (works with 5V FTDI cable too).

MCU serial

Testing MCU serial - to - UART via USB serial

picocom --baud 115200 --imap lfcrlf --echo /dev/ttyUSB0
picocom --baud 115200 --imap crcrlf --echo /dev/ttyACM0

Openocd standalone

Use openocd without GDB.

LTO (link time optimizaions) breaks GDB because linker generates an ELF that still refers to (now missing) inlined sections. OTOH without LTO binary doesn't fit into the flash.

Connect to the running openocd:

nc localhost 4444

Use built-in program script to erase/load new binary:

program target/thumbv7m-none-eabi/debug/controller

Enable debug output from the chip:

arm semihosting enable

Reset chip

reset