rgbmatrix: Don't crash when setting brightness=0

If the display is paused, `_PM_swapbuffer_maybe` will never return.
So, when brightness is 0, refresh does nothing.  This makes it necessary
to update the display when unpausing.

Closes: #3524

1 files changed, 6 insertions, 2 deletions

diff --git a/shared-module/rgbmatrix/RGBMatrix.c b/shared-module/rgbmatrix/RGBMatrix.c
index 3007ca4db..abd6d500f 100644
--- a/shared-module/rgbmatrix/RGBMatrix.c
+++ b/shared-module/rgbmatrix/RGBMatrix.c
@@ -190,6 +190,8 @@ void common_hal_rgbmatrix_rgbmatrix_set_paused(rgbmatrix_rgbmatrix_obj_t* self,
         _PM_stop(&self->protomatter);
     } else if (!paused && self->paused) {
         _PM_resume(&self->protomatter);
+        _PM_convert_565(&self->protomatter, self->bufinfo.buf, self->width);
+        _PM_swapbuffer_maybe(&self->protomatter);
     }
     self->paused = paused;
 }
@@ -199,8 +201,10 @@ bool common_hal_rgbmatrix_rgbmatrix_get_paused(rgbmatrix_rgbmatrix_obj_t* self)
 }
 
 void common_hal_rgbmatrix_rgbmatrix_refresh(rgbmatrix_rgbmatrix_obj_t* self) {
-    _PM_convert_565(&self->protomatter, self->bufinfo.buf, self->width);
-    _PM_swapbuffer_maybe(&self->protomatter);
+    if (!self->paused) {
+        _PM_convert_565(&self->protomatter, self->bufinfo.buf, self->width);
+        _PM_swapbuffer_maybe(&self->protomatter);
+    }
 }
 
 int common_hal_rgbmatrix_rgbmatrix_get_width(rgbmatrix_rgbmatrix_obj_t* self) {