esp32/modmachine: Support bootloader on ESP32-S2/S3/C2/C3.
On these targets it's possible to enter the bootloader by setting a bit in
an RTC register before resetting.
Structure it in a way that a board can still provide a custom bootloader
handler. The handler here will be the default if none is provided, for any
board based on the supported targets.
Signed-off-by: Trent Piepho <tpiepho@gmail.com>
diff --git a/ports/esp32/mpconfigport.h b/ports/esp32/mpconfigport.h
index 0474b7e..f004c78 100644
--- a/ports/esp32/mpconfigport.h
+++ b/ports/esp32/mpconfigport.h
@@ -268,6 +268,14 @@
#define MICROPY_HW_ENABLE_MDNS_RESPONDER (1)
#endif
+#ifndef MICROPY_BOARD_ENTER_BOOTLOADER
+// RTC has a register to trigger bootloader on these targets
+#if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C2 || CONFIG_IDF_TARGET_ESP32C3
+#define MICROPY_ESP32_USE_BOOTLOADER_RTC (1)
+#define MICROPY_BOARD_ENTER_BOOTLOADER(nargs, args) machine_bootloader_rtc()
+#endif
+#endif
+
#ifdef MICROPY_BOARD_ENTER_BOOTLOADER
#define MICROPY_PY_MACHINE_BOOTLOADER (1)
#else