16-Jun-2021
- Thomas Watteyne
Attendees
@Thomas Watteyne
@Austin Patel
@Kristofer PISTER
@David Burnett
@Fil Maksimovic
@Martina Balbi
@Said Alvarado-Marin
Action items
Minutes
@Thomas Watteyne
Farnell order (60x XLs, 2x dev boards) should be received on Jun 17, 2021
Will hold onto chips, just let me know where we should send it
@Austin Patel will do!
@Said Alvarado-Marin
DotBot runs!
@Martina Balbi
BLE-based connectivity working
@Fil Maksimovic
LH2: working on calibration using a calibration board (4x LH2 receivers)
FPGA: thanks @David Burnett for point to https://github.com/PyFive-RISC-V/caravel_pyfive ! implements exactly what was needed, peripheral bus (Wishbone), DMA and HW acceleration
@David Burnett https://opencores.org/
@Kristofer PISTER great, as previous experience wasn’t fantastic with other approaches
@Kristofer PISTER
VDDD tap: would prefer not haven’t an external regulator, breaks the vision a bit
we would like SCuM itself to work as a true single chip
do we get different results depending on the test (tapping a wire vs. using a power supply)
2 tests:
use a real wire
use the nRF:
pin to VDDD LDO out
high z, set 1, strobe from high z to active output, to high z, emulating tapping behavior
@David Burnett it that doesn’t work, we can use a voltage divider
discussion about previous tests
tapped at 1.1V: @aus
@Austin Patel
test 1 leave tap connected, record whether programming works, optical programming, on McCoy with the IMU
test 2: remove tap when seeing program running
constant 1.8V didn't work; a tap at 1.8V didn’t work (board wouldn’t program)
@Kristofer PISTER what did we do?
@Fil Maksimovic program, doesn’t execute, tap, it executes
@Kristofer PISTER looks like the only difference is the duration of the tap
@Thomas Watteyne we could use the nRF to vary (sweep) the duration of the tap
@Kristofer PISTER we need to get the nRF up and running, and try with the 3-wire bus
@Austin Patel probably the next step is to use the nRF.
thoughts: people integrating on micro-robots may only need cold boot
low confidence this will work
looking to having the board work
@Kristofer PISTER let’s
have @Andrew Fearing put a regulator to get things going
study this with the nRF by disconnecting the regulator
@Kristofer PISTER can we put a resistor divider on the board so voltage from nRF goes down to 1.1V
@Austin Patel another pin which has the voltage divider, do can choose between straight to nRF, or voltage divider
@Fil Maksimovic use a break-out board of a regulator?
@Austin Patel will ask @Andrew Fearing
@Thomas Watteyne to write a UART pass-through snippet
@Thomas Watteyne to write a strobe snippet
@David Burnett
writing proposal