From f81d4a39f53b1c386d7963d66f70d0a7aa9cd0a0 Mon Sep 17 00:00:00 2001
From: Daniel Morgan <danmorgz@googlemail.com>
Date: Tue, 16 Jan 2024 16:24:27 +0100
Subject: [PATCH] changes to support seeed xiao esp32s3

---
 UsbCore.h |  2 ++
 avrpins.h | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/UsbCore.h b/UsbCore.h
index c8715e51..d328a40b 100644
--- a/UsbCore.h
+++ b/UsbCore.h
@@ -48,6 +48,8 @@ typedef MAX3421e<P20, P19> MAX3421E; // Balanduino
 typedef MAX3421e<P3, P2> MAX3421E; // The Intel Galileo supports much faster read and write speed at pin 2 and 3
 #elif defined(ESP8266)
 typedef MAX3421e<P15, P5> MAX3421E; // ESP8266 boards
+#elif defined(ARDUINO_XIAO_ESP32S3)
+typedef MAX3421e<P44, P4> MAX3421E; // ESP32 XIAO boards
 #elif defined(ESP32)
 typedef MAX3421e<P5, P17> MAX3421E; // ESP32 boards
 #elif defined(MIGHTYCORE)
diff --git a/avrpins.h b/avrpins.h
index 0f63d31f..29189904 100644
--- a/avrpins.h
+++ b/avrpins.h
@@ -1661,6 +1661,47 @@ MAKE_PIN(P13, 13); // MOSI
 MAKE_PIN(P14, 14); // SCK
 MAKE_PIN(P15, 15); // SS
 
+#elif defined(ARDUINO_XIAO_ESP32S3)
+
+// Workaround strict-aliasing warnings
+#ifdef pgm_read_word
+#undef pgm_read_word
+#endif
+#ifdef pgm_read_dword
+#undef pgm_read_dword
+#endif
+#ifdef  pgm_read_float
+#undef pgm_read_float
+#endif
+#ifdef  pgm_read_ptr
+#undef pgm_read_ptr
+#endif
+
+#define pgm_read_word(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned short *)(_addr); \
+})
+#define pgm_read_dword(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const unsigned long *)(_addr); \
+})
+#define pgm_read_float(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(const float *)(_addr); \
+})
+#define pgm_read_ptr(addr) ({ \
+  typeof(addr) _addr = (addr); \
+  *(void * const *)(_addr); \
+})
+
+// Pinout for ESP32 dev module
+
+MAKE_PIN(P8, 8); // MISO
+MAKE_PIN(P9, 9); // MOSI
+MAKE_PIN(P7, 7); // SCK
+MAKE_PIN(P44, 44); // SS
+MAKE_PIN(P4, 4); // INT
+
 #elif defined(ESP32)
 
 // Workaround strict-aliasing warnings