From 7dd40e2014a04a3af560c212815cd77ca604b667 Mon Sep 17 00:00:00 2001
From: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Date: Fri, 10 Sep 2021 12:10:28 +1200
Subject: [PATCH 1/3] Fix a few ESP32-C3 compiler issues (#2265)

* Fix using Serial when using ESP32-C3 standard pins

* Force type for std::min in pn532

* Fix variable size where size_t is different on exp32-c3
---
 esphome/components/api/api_frame_helper.cpp | 2 +-
 esphome/components/pn532/pn532.cpp          | 2 +-
 esphome/components/uart/uart_esp32.cpp      | 4 ++++
 3 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/esphome/components/api/api_frame_helper.cpp b/esphome/components/api/api_frame_helper.cpp
index 26fbf1269f..520a5c2caf 100644
--- a/esphome/components/api/api_frame_helper.cpp
+++ b/esphome/components/api/api_frame_helper.cpp
@@ -707,7 +707,7 @@ APIError APIPlaintextFrameHelper::try_read_frame_(ParsedFrame *frame) {
     }
 
     size_t i = 1;
-    size_t consumed = 0;
+    uint32_t consumed = 0;
     auto msg_size_varint = ProtoVarInt::parse(&rx_header_buf_[i], rx_header_buf_.size() - i, &consumed);
     if (!msg_size_varint.has_value()) {
       // not enough data there yet
diff --git a/esphome/components/pn532/pn532.cpp b/esphome/components/pn532/pn532.cpp
index fc84f30078..fcab9872c4 100644
--- a/esphome/components/pn532/pn532.cpp
+++ b/esphome/components/pn532/pn532.cpp
@@ -49,7 +49,7 @@ void PN532::setup() {
   }
 
   // Set up SAM (secure access module)
-  uint8_t sam_timeout = std::min(255u, this->update_interval_ / 50);
+  uint8_t sam_timeout = std::min<uint8_t>(255u, this->update_interval_ / 50);
   if (!this->write_command_({
           PN532_COMMAND_SAMCONFIGURATION,
           0x01,         // normal mode
diff --git a/esphome/components/uart/uart_esp32.cpp b/esphome/components/uart/uart_esp32.cpp
index 16d683e4a6..c672a34c36 100644
--- a/esphome/components/uart/uart_esp32.cpp
+++ b/esphome/components/uart/uart_esp32.cpp
@@ -73,7 +73,11 @@ void UARTComponent::setup() {
   // Use Arduino HardwareSerial UARTs if all used pins match the ones
   // preconfigured by the platform. For example if RX disabled but TX pin
   // is 1 we still want to use Serial.
+#ifdef CONFIG_IDF_TARGET_ESP32C3
+  if (this->tx_pin_.value_or(21) == 21 && this->rx_pin_.value_or(20) == 20) {
+#else
   if (this->tx_pin_.value_or(1) == 1 && this->rx_pin_.value_or(3) == 3) {
+#endif
     this->hw_serial_ = &Serial;
   } else {
     this->hw_serial_ = new HardwareSerial(next_uart_num++);

From 87842e097bcb02893d2dea286f4af7970fa3492f Mon Sep 17 00:00:00 2001
From: poptix <poptix@poptix.net>
Date: Fri, 10 Sep 2021 04:05:25 -0500
Subject: [PATCH 2/3] sm300d2: Accept (undocumented) 0x80 checksum offset.
 (#2263)

Co-authored-by: Matt Hallacy <github@poptix.net>
---
 esphome/components/sm300d2/sm300d2.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/esphome/components/sm300d2/sm300d2.cpp b/esphome/components/sm300d2/sm300d2.cpp
index 34d80349f9..b1787581ae 100644
--- a/esphome/components/sm300d2/sm300d2.cpp
+++ b/esphome/components/sm300d2/sm300d2.cpp
@@ -27,7 +27,8 @@ void SM300D2Sensor::update() {
   }
 
   uint16_t calculated_checksum = this->sm300d2_checksum_(response);
-  if (calculated_checksum != response[SM300D2_RESPONSE_LENGTH - 1]) {
+  if ((calculated_checksum != response[SM300D2_RESPONSE_LENGTH - 1]) &&
+      (calculated_checksum - 0x80 != response[SM300D2_RESPONSE_LENGTH - 1])) {
     ESP_LOGW(TAG, "SM300D2 Checksum doesn't match: 0x%02X!=0x%02X", response[SM300D2_RESPONSE_LENGTH - 1],
              calculated_checksum);
     this->status_set_warning();

From 9821a3442bc7e10654af3b26b6c8785efe9a6de4 Mon Sep 17 00:00:00 2001
From: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Date: Fri, 10 Sep 2021 21:34:38 +1200
Subject: [PATCH 3/3] Bump version to 2021.9.0b2

---
 esphome/const.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/const.py b/esphome/const.py
index 44e3c09870..100d89594b 100644
--- a/esphome/const.py
+++ b/esphome/const.py
@@ -1,6 +1,6 @@
 """Constants used by esphome."""
 
-__version__ = "2021.9.0b1"
+__version__ = "2021.9.0b2"
 
 ESP_PLATFORM_ESP32 = "ESP32"
 ESP_PLATFORM_ESP8266 = "ESP8266"