From 38b8b41ccc9b4c4d1a963ae98b6308d9a34fe988 Mon Sep 17 00:00:00 2001
From: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com>
Date: Thu, 21 May 2026 18:03:07 -0400
Subject: [PATCH] [sx126x] Assert NSS before wait_busy so commands wake the
 chip from sleep (#16546)

---
 esphome/components/sx126x/sx126x.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/esphome/components/sx126x/sx126x.cpp b/esphome/components/sx126x/sx126x.cpp
index 6e6857fadb..83afeac50a 100644
--- a/esphome/components/sx126x/sx126x.cpp
+++ b/esphome/components/sx126x/sx126x.cpp
@@ -30,8 +30,8 @@ static constexpr uint8_t OCP_140MA = 0x38;  // 140 mA max current
 static constexpr float LOW_DATA_RATE_OPTIMIZE_THRESHOLD = 16.38f;  // 16.38 ms
 
 uint8_t SX126x::read_fifo_(uint8_t offset, std::vector<uint8_t> &packet) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->transfer_byte(RADIO_READ_BUFFER);
   this->transfer_byte(offset);
   uint8_t status = this->transfer_byte(0x00);
@@ -43,8 +43,8 @@ uint8_t SX126x::read_fifo_(uint8_t offset, std::vector<uint8_t> &packet) {
 }
 
 void SX126x::write_fifo_(uint8_t offset, const std::vector<uint8_t> &packet) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->transfer_byte(RADIO_WRITE_BUFFER);
   this->transfer_byte(offset);
   for (const uint8_t &byte : packet) {
@@ -55,8 +55,8 @@ void SX126x::write_fifo_(uint8_t offset, const std::vector<uint8_t> &packet) {
 }
 
 uint8_t SX126x::read_opcode_(uint8_t opcode, uint8_t *data, uint8_t size) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->transfer_byte(opcode);
   uint8_t status = this->transfer_byte(0x00);
   for (int32_t i = 0; i < size; i++) {
@@ -67,8 +67,8 @@ uint8_t SX126x::read_opcode_(uint8_t opcode, uint8_t *data, uint8_t size) {
 }
 
 void SX126x::write_opcode_(uint8_t opcode, uint8_t *data, uint8_t size) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->transfer_byte(opcode);
   for (int32_t i = 0; i < size; i++) {
     this->transfer_byte(data[i]);
@@ -78,8 +78,8 @@ void SX126x::write_opcode_(uint8_t opcode, uint8_t *data, uint8_t size) {
 }
 
 void SX126x::read_register_(uint16_t reg, uint8_t *data, uint8_t size) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->write_byte(RADIO_READ_REGISTER);
   this->write_byte((reg >> 8) & 0xFF);
   this->write_byte((reg >> 0) & 0xFF);
@@ -91,8 +91,8 @@ void SX126x::read_register_(uint16_t reg, uint8_t *data, uint8_t size) {
 }
 
 void SX126x::write_register_(uint16_t reg, uint8_t *data, uint8_t size) {
-  this->wait_busy_();
   this->enable();
+  this->wait_busy_();
   this->write_byte(RADIO_WRITE_REGISTER);
   this->write_byte((reg >> 8) & 0xFF);
   this->write_byte((reg >> 0) & 0xFF);