From d44219123ff95f151bd523c7fab057c51f96f368 Mon Sep 17 00:00:00 2001
From: Yannick <78848398+yannick818@users.noreply.github.com>
Date: Wed, 5 Nov 2025 16:01:47 +0100
Subject: stm32/dsi: support short write without parameters

---
 embassy-stm32/src/dsihost.rs | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/embassy-stm32/src/dsihost.rs b/embassy-stm32/src/dsihost.rs
index fd1682d2b..59a2cbcdb 100644
--- a/embassy-stm32/src/dsihost.rs
+++ b/embassy-stm32/src/dsihost.rs
@@ -121,17 +121,15 @@ impl<'d, T: Instance> DsiHost<'d, T> {
 
     /// DCS or Generic short/long write command
     pub fn write_cmd(&mut self, channel_id: u8, address: u8, data: &[u8]) -> Result<(), Error> {
-        assert!(data.len() > 0);
-
-        if data.len() == 1 {
-            self.short_write(channel_id, PacketType::DcsShortPktWriteP1, address, data[0])
-        } else {
-            self.long_write(
+        match data.len() {
+            0 => self.short_write(channel_id, PacketType::DcsShortPktWriteP0, address, 0),
+            1 => self.short_write(channel_id, PacketType::DcsShortPktWriteP1, address, data[0]),
+            _ => self.long_write(
                 channel_id,
                 PacketType::DcsLongPktWrite, // FIXME: This might be a generic long packet, as well...
                 address,
                 data,
-            )
+            ),
         }
     }
 
-- 
cgit 


From 1f2d953b5662fadecad1e63e9e17efdd881e7d0d Mon Sep 17 00:00:00 2001
From: Yannick <78848398+yannick818@users.noreply.github.com>
Date: Thu, 6 Nov 2025 17:06:52 +0100
Subject: added changelog entry

---
 embassy-stm32/CHANGELOG.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/embassy-stm32/CHANGELOG.md b/embassy-stm32/CHANGELOG.md
index ee76a5d1b..35dd79d2a 100644
--- a/embassy-stm32/CHANGELOG.md
+++ b/embassy-stm32/CHANGELOG.md
@@ -44,6 +44,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - feat: Added RTC low-power support for STM32WLEx ([#4716](https://github.com/embassy-rs/embassy/pull/4716))
 - fix: Correct STM32WBA VREFBUFTRIM values
 - low_power: remove stop_with rtc and initialize in init if low-power feature enabled.
+- feat: stm32/dsi support zero parameter commands in `write_cmd` ([#4847](https://github.com/embassy-rs/embassy/pull/4847))
 
 ## 0.4.0 - 2025-08-26
 
-- 
cgit