roughed in support for esp32-h2 via Waveshare dev board

src/modules/ExternalNotificationModule.h

@@ -23,7 +23,8 @@ extern AmbientLightingThread *ambientLightingThread;
 #endif
 #endif
 
-#if !defined(ARCH_PORTDUINO) && !defined(ARCH_STM32WL) && !defined(CONFIG_IDF_TARGET_ESP32C6)
+#if !defined(ARCH_PORTDUINO) && !defined(ARCH_STM32WL) && !defined(CONFIG_IDF_TARGET_ESP32C6) &&                                 \
+    !defined(CONFIG_IDF_TARGET_ESP32H2)
 #include <NonBlockingRtttl.h>
 #else
 // Noop class for portduino.

src/modules/SerialModule.cpp

@@ -175,7 +175,7 @@ int32_t SerialModule::runOnce()
                 // Give it a chance to flush out 💩
                 delay(10);
             }
-#if defined(CONFIG_IDF_TARGET_ESP32C6)
+#if defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2)
             if (moduleConfig.serial.rxd && moduleConfig.serial.txd) {
                 Serial1.setRxBufferSize(RX_BUFFER);
                 Serial1.begin(baud, SERIAL_8N1, moduleConfig.serial.rxd, moduleConfig.serial.txd);
@@ -279,7 +279,7 @@ int32_t SerialModule::runOnce()
             }
 #endif
             else {
-#if defined(CONFIG_IDF_TARGET_ESP32C6)
+#if defined(CONFIG_IDF_TARGET_ESP32C6) || defined(CONFIG_IDF_TARGET_ESP32H2)
                 while (Serial1.available()) {
                     serialPayloadSize = Serial1.readBytes(serialBytes, meshtastic_Constants_DATA_PAYLOAD_LEN);
 #else
@@ -542,8 +542,7 @@ ParsedLine parseLine(const char *line)
  */
 void SerialModule::processWXSerial()
 {
-#if SERIAL_PRINT_PORT != 0 && !defined(ARCH_STM32WL) && !defined(CONFIG_IDF_TARGET_ESP32C6)
-
+#if SERIAL_PRINT_PORT != 0 && !defined(ARCH_STM32WL) && !defined(CONFIG_IDF_TARGET_ESP32C6) && !defined(CONFIG_IDF_TARGET_ESP32H2)
     static unsigned int lastAveraged = 0;
     static unsigned int averageIntervalMillis = 300000; // 5 minutes hard coded.
     static double dir_sum_sin = 0;

src/platform/esp32/main-esp32.cpp

@@ -277,6 +277,8 @@ void esp32Setup()
 // #define APP_WATCHDOG_SECS 45
 #define APP_WATCHDOG_SECS 90
 
+// esp_task_wdt_init returns an unknown error, so skip it on ESP32H2
+#ifndef CONFIG_IDF_TARGET_ESP32H2
 #if ESP_ARDUINO_VERSION >= ESP_ARDUINO_VERSION_VAL(3, 0, 0)
     const esp_task_wdt_config_t wdt_config = {
         .timeout_ms = APP_WATCHDOG_SECS * 1000,
@@ -302,7 +304,7 @@ void esp32Setup()
         res = esp_task_wdt_add(NULL);
     }
     assert(res == ESP_OK);
-
+#endif
 #if HAS_32768HZ
     enableSlowCLK();
 #endif
@@ -311,7 +313,9 @@ void esp32Setup()
 /// loop code specific to ESP32 targets
 void esp32Loop()
 {
+#ifndef CONFIG_IDF_TARGET_ESP32H2
     esp_task_wdt_reset(); // service our app level watchdog
+#endif
 
     // for debug printing
     // radio.radioIf.canSleep();
@@ -344,9 +348,10 @@ void cpuDeepSleep(uint32_t msecToWake)
         13,
 #endif
         34, 35, 37};
-
+#ifndef CONFIG_IDF_TARGET_ESP32H2
     for (int i = 0; i < sizeof(rtcGpios); i++)
         rtc_gpio_isolate((gpio_num_t)rtcGpios[i]);
+#endif
 #endif
 
         // FIXME, disable internal rtc pullups/pulldowns on the non isolated pins. for inputs that we aren't using

src/sleep.cpp

@@ -564,6 +564,8 @@ void enableModemSleep()
     esp32_config.max_freq_mhz = CONFIG_ESP32S2_DEFAULT_CPU_FREQ_MHZ;
 #elif CONFIG_IDF_TARGET_ESP32C6
     esp32_config.max_freq_mhz = CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ;
+#elif CONFIG_IDF_TARGET_ESP32H2
+    esp32_config.max_freq_mhz = CONFIG_ESP_DEFAULT_CPU_FREQ_MHZ;
 #elif CONFIG_IDF_TARGET_ESP32C3
     esp32_config.max_freq_mhz = CONFIG_ESP32C3_DEFAULT_CPU_FREQ_MHZ;
 #elif CONFIG_IDF_TARGET_ESP32P4

variants/esp32h2/esp32h2.ini

@@ -0,0 +1,26 @@
+[esp32h2_base]
+extends = esp32_common
+custom_esp32_kind = esp32h2
+
+build_flags =
+  ${esp32_common.build_flags}
+  -DHAS_WIFI=0
+  -DMESHTASTIC_EXCLUDE_WIFI=1 ; TODO
+  -DMESHTASTIC_EXCLUDE_MQTT=1
+  -DMESHTASTIC_EXCLUDE_PAXCOUNTER=1
+  -DMESHTASTIC_EXCLUDE_WEBSERVER=1
+
+build_unflags=
+  -DHAS_UDP_MULTICAST=1
+
+build_src_filter =
+  ${esp32_common.build_src_filter} -<mesh/http>
+
+monitor_speed = 460800
+monitor_filters = esp32_h2_exception_decoder
+
+lib_ignore =
+  ${esp32_common.lib_ignore}
+  libpax
+  esp32_idf5_https_server
+  esp_http_server

variants/esp32h2/waveshare-esp32-h2/platformio.ini

@@ -0,0 +1,12 @@
+[env:waveshare-esp32h2]
+extends = esp32h2_base
+board = esp32-h2-devkitm-1
+board_build.f_flash = 16000000L
+; Set this back to 'pr' once the CI plumbing is in place.
+; board_level = pr
+board_level = extra
+build_flags =
+  ${esp32h2_base.build_flags}
+  -I variants/esp32h2/waveshare-esp32-h2
+  -DARDUINO_USB_CDC_ON_BOOT=1
+  -DARDUINO_USB_MODE=1

variants/esp32h2/waveshare-esp32-h2/variant.h

@@ -0,0 +1,9 @@
+
+#define HAS_SCREEN 0
+
+#define SERIAL_PRINT_PORT 1
+
+#define LORA_SCK 4
+#define LORA_MISO 3
+#define LORA_MOSI 2
+#define LORA_CS 1