STM32F4: SPI communications (#998)

* cleanup is_enumerated, rename comms and init spi

* big comms refactor, building now

* misra fixes

* more fixes

* misra try 3

* cleanup

* this belongs in a separate PR

* remove unneccesary file

* revert llspi changes

* llspi misra fix

* enable SPI on F4 and setup gpio

* duh

* wip: spi comms

* more spi wip

* dynamic sector erasing

* Revert "dynamic sector erasing"

This reverts commit fce1215a2ede45e5e2a0e97ca23a86c1d8bfa94a.

* more sectors to be erased

* debugging

* woah, this works

* cleanup on the panda side

* add sync and checksum checks, and fix recovery on errors

* this seems relatively stable

* add retrying

* this is stabler

* some endianness and endpoint fixes

* builds

* revert that

* add that back

* checksum start

* start splitting up driver

* spi behind flag

* cleanup test

* bump up timeout

Co-authored-by: Comma Device <device@comma.ai>
Co-authored-by: Adeeb Shihadeh <adeebshihadeh@gmail.com>

.github/workflows/test.yaml

@@ -40,10 +40,10 @@ jobs:
         run: eval "$BUILD"
       - name: Test python package installer
         run: ${{ env.RUN }} "cd /tmp/openpilot/panda && python setup.py install"
-      - name: Build panda STM image and bootstub
-        run: ${{ env.RUN }} "cd /tmp/openpilot/panda && scons"
-      - name: Build pedal STM image and bootstub
-        run: ${{ env.RUN }} "cd /tmp/openpilot/panda && PEDAL=1 scons"
+      - name: Build panda + pedal images and bootstub
+        run: ${{ env.RUN }} "cd /tmp/openpilot/panda && scons -j4"
+      - name: Build panda with SPI support
+        run: ${{ env.RUN }} "cd /tmp/openpilot/panda && ENABLE_SPI=1 scons -j4"
 
   unit_tests:
     name: unit tests
@@ -66,7 +66,7 @@ jobs:
       - name: Build Docker image
         run: eval "$BUILD"
       - name: Run safety tests
-        timeout-minutes: 3
+        timeout-minutes: 4
         run: |
           ${{ env.RUN }} "cd /tmp/openpilot && \
                           scons -c && \