From ed48b4f15eb8347cdf40c90c1e456d3227d6062a Mon Sep 17 00:00:00 2001
From: Kyle Stonacek <kyle@stonacek.nz>
Date: Wed, 4 Mar 2026 17:35:35 +1300
Subject: [PATCH] support for ESP32-C3 supermini

---
 platformio.ini | 20 ++++++++++++++++++--
 src/main.cpp   | 14 ++++++++++----
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/platformio.ini b/platformio.ini
index 904dfe6..00eb70f 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -9,7 +9,7 @@
 ; https://docs.platformio.org/page/projectconf.html
 
 [platformio]
-default_envs = esp32dev, espa-v1, espa-v2
+default_envs = esp32dev, espa-v1, espa-v2, esp32-c3-devkitm-1
 ; data_dir = {$PROJECT_DIR}/data
 
 [env:spa-base]
@@ -86,4 +86,20 @@ build_flags =
   -D TX_PIN=20          ; Spa serial TX
   -D EN_PIN=9           ; Enable/config button
   -D GP_PIN=21          ; General purpose button (reserved)
-  -D SPA_SERIAL=Serial1 ; ESP32-C6 only has UART0/UART1, no UART2
\ No newline at end of file
+  -D SPA_SERIAL=Serial1 ; ESP32-C6 only has UART0/UART1, no UART2
+
+[env:esp32-c3-devkitm-1]
+extends = env:spa-base
+# ESP32-C3 DevKitC-1 for esp32-c3 super mini
+# super mini only has one serial rx/tx, so serial debugging is disabled.
+framework = arduino 
+board = esp32-c3-devkitm-1
+board_build.mcu = esp32c3
+board_build.partitions = partitions/espa_v2_partitions.csv
+board_upload.flash_size = 4MB
+build_flags =
+  -D ESP32_C3=1
+  -D RX_PIN=20
+  -D TX_PIN=21
+  -D EN_PIN=0
+  -D SPA_SERIAL=Serial0 ; ESP32-C3 only has UART0
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 2835140..e9538a7 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -646,8 +646,10 @@ void setup() {
     pinMode(GP_PIN, INPUT_PULLUP);
   #endif
 
-  Serial.begin(115200);
-  
+  #if !defined(ESP32_C3)
+    Serial.begin(115200);
+  #endif
+
   #if defined(ESPA_V2)
     // ESP32-C6: Wait for USB CDC to connect (with timeout)
     unsigned long startWait = millis();
@@ -657,8 +659,12 @@ void setup() {
     delay(100);  // Extra settling time for USB
   #endif
   
-  Serial.setDebugOutput(true);
-  Debug.setSerialEnabled(true);
+  #if defined(ESP32_C3) // ESP32-C3 can not support serial output since it only has 1 uart
+    Debug.setSerialEnabled(false);
+  #else
+    Serial.setDebugOutput(true);
+    Debug.setSerialEnabled(true);
+  #endif
 
   si.begin();  // Initialize SpaInterface serial communication