Backplane

Code for running the prototype backplane

Installation

• tps_pmbus module pip3 install smbus2
• Adafruit ADS1x15 library pip3 install adafruit-ads1x15
• configurate i2c bus 4 on pins 23 (sda) and 24 (scl)
  • in /boot/config.txt uncomment/add: dtparam=i2c_arm=on dtoverlay=i2c-gpio,bus=4,i2c_gpio_delay_us=1,i2c_gpio_sda=23,i2c_gpio_scl=24
• configurate i2c bus 3 on pins 7 (sda) and 8 (scl) (normally not needed; for additional external devices) dtoverlay=i2c-gpio,bus=3,i2c_gpio_delay_us=1,i2c_gpio_sda=7,i2c_gpio_scl=8

Pins Pi

• TPSs: bus 1 (sda1 to pin 2, scl1 to pin 3)
• ADCs: bus 4 (sda2 to 23, scl2 to 24) (see above)

Controlling Boards

• start session with ./start_session.sh
• this is now running a tmux session with prefix set to control + w (press simultaniously)
• to exit the session (for example if you turned off the powersupply etc) press prefix followed by x (so ctrl + w simultaniously, let go and then press x)
• call object with tpsXX.method()
• function examples
  • toggle_on_off_bit()
    • 0: off
    • 1: on
    • nothing/-1: toggle
  • toggle_en_pin_behaviour(n)
    • 0: ignore
    • 1: on
    • nothing/-1: toggle
  • get_switching_freq()
  • set_switching_feq(n)
    • 0-7
  • get_status_word()
  • clear_faults()
  • status()
  • stats()
  • set_UVLO_threshold(n)
    • 0-3
  • get_UVLO_threshold()
  • load_defaults()
    • 1 MHz, ignore enable pin, FCCM, converter off (on with toggle_converter())
  • toggle_fccm(n)
    • 0: DCM (discontinuous conduction mode)
    • 1: FCCM (forced continuous conduction mode)
    • nothing/-1: toggle
• old stuff (just ignore)
  • edit control_board.py and uncomment/add lines including device I2C address
  • run python3 -i control_boards.py for interactive python session

Temperature Reading

• to activate the one wire temp interface on the RaspberryPi, run ./activate_temp_sensors_interface.sh
  • only need to do that once after every restart
• a dictionary converting the unique ID of the temp sensor to a board address can be found under Devices/ds18b20.py
  • add entry here when adding/changing temp sensor

Reading ADCS

• run python3 adc_readout.py
• to change parameters edit adc_readout.py def get_channels(self, interval: float = 0, voltages: bool = True): ...

Layouts

• even_horizontal