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NRF52 TODO

Initial work items

Minimum items needed to make sure hardware is good.

DONE select and install a bootloader (adafruit)
DONE get old radio driver working on NRF52
DONE basic test of BLE
DONE get a debug 'serial' console working via the ICE passthrough feater
Use the PMU driver on real hardware
add a NEMA based GPS driver to test GPS
Use new radio driver on real hardware - possibly start with https://os.mbed.com/teams/Semtech/code/SX126xLib/
Use UC1701 LCD driver on real hardware. Still need to create at startup and probe on SPI
test the LEDs
test the buttons
make a new boarddef with a variant.h file. Fix pins in that file. In particular (at least): #define PIN_SPI_MISO (46) #define PIN_SPI_MOSI (45) #define PIN_SPI_SCK (47) #define PIN_WIRE_SDA (26) #define PIN_WIRE_SCL (27)

Secondary work items

Needed to be fully functional at least at the same level of the ESP32 boards. At this point users would probably want them.

enable BLE DFU somehow
set appversion/hwversion
report appversion/hwversion in BLE
use new LCD driver from screen.cpp. Still need to hook it to a subclass of (poorly named) OLEDDisplay, and override display() to stream bytes out to the screen.
get full BLE api working
we need to enable the external xtal for the sx1262 (on dio3)
figure out which regulator mode the sx1262 is operating in
turn on security for BLE, make pairing work
make power management/sleep work properly
make a settimeofday implementation
make a file system implementation (preferably one that can see the files the bootloader also sees) - use https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_fds_usage.html?cp=7_5_0_3_55_3
make ble endpoints not require "start config", just have them start in config mode
measure power management and confirm battery life
use new PMU to provide battery voltage/% full to app (both bluetooth and screen)
do initial power measurements

Items to be 'feature complete'

good power management tips: https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/optimizing-power-on-nrf52-designs
call PMU set_ADC_CONV(0) during sleep, to stop reading PMU adcs and decrease current draw
do final power measurements
backport the common PMU API between AXP192 and PmuBQ25703A
use the new buttons in the UX
currently using soft device SD140, is that ideal?
turn on the watchdog timer, require servicing from key application threads
install a hardfault handler for null ptrs (if one isn't already installed)

Things to do 'someday'

Nice ideas worth considering someday...

Use NRF logger module (includes flash logging etc...) instead of DEBUG_MSG
Use "LED softblink" library on NRF52 to do nice pretty "breathing" LEDs. Don't whack LED from main thread anymore.
decrease BLE xmit power "At 0dBm with the DC/DC on, the nRF52832 transmitter draws 5.3mA. Increasing the TX power to +4dBm adds only 2.2mA. Decreasing it to -40 dBm saves only 2.6mA."
in addition to the main CPU watchdog, use the PMU watchdog as a really big emergency hammer
turn on 'shipping mode' in the PMU when device is 'off' - to cut battery draw to essentially zero
make Lorro_BQ25703A read/write operations atomic, current version could let other threads sneak in (once we start using threads)
turn on DFU assistance in the appload using the nordic DFU helper lib call
make the segger logbuffer larger, move it to RAM that is preserved across reboots and support reading it out at runtime (to allow full log messages to be included in crash reports). Share this code with ESP32 (use gcc noinit attribute)
convert hardfaults/panics/asserts/wd exceptions into fault codes sent to phone
stop enumerating all i2c devices at boot, it wastes power & time
consider using "SYSTEMOFF" deep sleep mode, without RAM retension. Only useful for 'truly off - wake only by button press' only saves 1.5uA vs SYSTEMON. (SYSTEMON only costs 1.5uA). Possibly put PMU into shipping mode?

/*
per
https://docs.platformio.org/en/latest/tutorials/nordicnrf52/arduino_debugging_unit_testing.html

ardunino github is here https://github.com/sandeepmistry/arduino-nRF5
devboard hw docs here:
https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_buttons_leds.html?cp=4_0_4_7_6

https://docs.platformio.org/en/latest/boards/nordicnrf52/nrf52840_dk_adafruit.html

must install adafruit bootloader first!
https://learn.adafruit.com/circuitpython-on-the-nrf52/nrf52840-bootloader
see link above and turn off jlink filesystem if we see unreliable serial comms
over USBCDC

adafruit bootloader install commands (from their readme)
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog -e -f nrf52 Erasing user available code and UICR flash areas. Applying
system reset.
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog --program pca10056/pca10056_bootloader-0.3.2_s140_6.1.1.hex -f nrf52
Parsing hex file.
Reading flash area to program to guarantee it is erased.
Checking that the area to write is not protected.
Programming device.
kevinh@kevin-server:~/.platformio/packages/framework-arduinoadafruitnrf52/bootloader$
nrfjprog --reset -f nrf52 Applying system reset. Run.

install jlink tools from here:
https://www.segger.com/downloads/jlink#J-LinkSoftwareAndDocumentationPack

install nrf tools from here:
https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Command-Line-Tools/Download#infotabs

examples of turning off the loop call to save power:
https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/advertising-beacon

example of a more complex BLE service:
https://learn.adafruit.com/bluefruit-nrf52-feather-learning-guide/custom-hrm
*/

// See g_ADigitalPinMap to see how arduino maps to the real gpio#s - and all in
// P0
#define LED1 14
#define LED2 13

/*
good led ble demo:
https://github.com/adafruit/Adafruit_nRF52_Arduino/blob/master/libraries/Bluefruit52Lib/examples/Peripheral/nrf_blinky/nrf_blinky.ino
*/

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