This device implements the IM120417002 colors shield v1.1 for Arduino
(which relies on the DM163 8x3-channel led driving logic) and features
a simple display of an 8x8 RGB matrix. This color shield can be plugged
on the Arduino board (or the B-L475E-IOT01A board) to drive an 8x8
RGB led matrix. This RGB led matrix takes advantage of retinal persistance
to seemingly display different colors in each row.



I'm stuck on some issues with this implementation :

1. Tests

TLDR: how can I provide a test or an example?

I've tested the display by running custom executables and
comparing to the result on the real board, but I don't
know how to test it using a QTest.

`qtest_init_internal` sets `-display none`
so there's no way to test the display visually.

There's no `visit_type_*` for arrays so accessing the DM163
buffer to check its content is complicated. I could technically
access all the elements in the array (returning a different element
each time in the getter for example), but that seems sketchy.

2. Frame Rate

It'd be convenient to set the QEMU console's refresh rate
in order to ensure that the delay before turning off rows
(4 frames currently) isn't too short. However
`dpy_ui_info_supported(s->console)` returns false.



Changes from v2 : Corrected typo in the Based-on message id

Changes from v1 :
- moving the DM163 from the SoC to the B-L475E-IOT01A machine
(changing config files and tests accordingly)
- restricting DM163 test to ARM & DM163 availability
- using `object_class_by_name()` to check for DM163 presence at run-time
- exporting SYSCFG inputs to the SoC (and adapting tests accordingly)

Thank you for your review Philippe :)

Based-on: 20240224105417.195674-1-ines.varhol@telecom-paris.fr
([PATCH v6 0/3] Add device STM32L4x5 GPIO)

Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>

Inès Varhol (5):
  hw/display : Add device DM163
  hw/arm : Pass STM32L4x5 SYSCFG gpios to STM32L4x5 SoC
  hw/arm : Create Bl475eMachineState
  hw/arm : Connect DM163 to B-L475E-IOT01A
  tests/qtest : Add testcase for DM163

 docs/system/arm/b-l475e-iot01a.rst  |   3 +-
 include/hw/display/dm163.h          |  57 +++++
 hw/arm/b-l475e-iot01a.c             | 103 ++++++++--
 hw/arm/stm32l4x5_soc.c              |   6 +-
 hw/display/dm163.c                  | 308 ++++++++++++++++++++++++++++
 tests/qtest/dm163-test.c            | 192 +++++++++++++++++
 tests/qtest/stm32l4x5_gpio-test.c   |  12 +-
 tests/qtest/stm32l4x5_syscfg-test.c |  16 +-
 hw/arm/Kconfig                      |   1 +
 hw/display/Kconfig                  |   3 +
 hw/display/meson.build              |   1 +
 hw/display/trace-events             |  13 ++
 tests/qtest/meson.build             |   5 +
 13 files changed, 690 insertions(+), 30 deletions(-)
 create mode 100644 include/hw/display/dm163.h
 create mode 100644 hw/display/dm163.c
 create mode 100644 tests/qtest/dm163-test.c

-- 
2.43.2