From 762a5e01ab0004a17ab3537b38c89b0eb5b4098e Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper
Date: Wed, 4 Jun 2025 00:22:49 -0600
Subject: emisar-d3aa: reduced preflash by changing timing of power enable
 steps

After testing on every device I can, and getting several users to also
test this, it appears to reduce and sometimes completely eliminate
preflash on most devices... and the cases where it wasn't reported to
help, at least it didn't make things worse.  Some units apparently just
can't get the flash eliminated completely, despite trying lots of things.

Instead of turning the chips on and then waiting 4ms, it now turns the
preflash absorber on, waits ~0.6ms, sets misc params, then turns the
boost chip on, then waits ~0.6ms, then turns the preflash absorber off.

This seems to work best on li-ion power, where on my devices it completely
eliminates any preflash.  There is still a very mild flash on AA though,
which I wasn't able to get rid of.  But it's like... 0.003 lm for just
a few milliseconds, really not bad.  Even in the worst case reported by
a user, based on the video they took, it looks like just 0.01 lm for
a few milliseconds.
---
 hw/hank/emisar-d3aa/hwdef.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'hw/hank/emisar-d3aa/hwdef.h')

diff --git a/hw/hank/emisar-d3aa/hwdef.h b/hw/hank/emisar-d3aa/hwdef.h
index 87740ba..889b721 100644
--- a/hw/hank/emisar-d3aa/hwdef.h
+++ b/hw/hank/emisar-d3aa/hwdef.h
@@ -85,7 +85,7 @@ enum CHANNEL_MODES {
 
 // IN- NFET
 // pull high to force output to zero to eliminate the startup flash
-#define IN_NFET_DELAY_TIME   12  // (ms)
+#define IN_NFET_DELAY_TIME   0  // (ms)
 #define IN_NFET_ENABLE_PIN   PIN4_bp
 #define IN_NFET_ENABLE_PORT  PORTD_OUT
 
-- 
cgit v1.2.3