samd/boards: Add generic SAMD21x18 board definitions.

robert-hh · dpgeorge · commit 304467518fbe · 2025-02-07T17:59:35.000+11:00
The definition uses the internal oscillator for clock and only internal
flash for the file system.

It works at SAMD21G18 and SAMD21E18 devices as well, only that fewer pins
are accessible.

Tested with a SAMD21E18, SAM21G18 and SAMD21J18 board.

Signed-off-by: robert-hh &lt;robert@hammelrath.com&gt;
diff --git a/ports/samd/boards/SAMD_GENERIC_D21X18/board.json b/ports/samd/boards/SAMD_GENERIC_D21X18/board.json
@@ -0,0 +1,16 @@
+{
+    "deploy": [
+        "../deploy.md"
+    ],
+    "docs": "",
+    "features": [
+        "USB"
+    ],
+    "images": [
+        "generic_board.jpg"
+    ],
+    "mcu": "samd21",
+    "vendor": "Microchip",
+    "product": "Generic SAMD21J18",
+    "thumbnail": ""
+}
diff --git a/ports/samd/boards/SAMD_GENERIC_D21X18/board.md b/ports/samd/boards/SAMD_GENERIC_D21X18/board.md
@@ -0,0 +1,4 @@
+The following firmware should work on most boards with a SAMD21E18,
+SAMD21G18 and SAMD21J18 MCU. It uses only the features built into
+the MCU. Additional devices at the board like external flash
+are not supported.
diff --git a/ports/samd/boards/SAMD_GENERIC_D21X18/mpconfigboard.h b/ports/samd/boards/SAMD_GENERIC_D21X18/mpconfigboard.h
@@ -0,0 +1,4 @@
+#define MICROPY_HW_BOARD_NAME "Generic SAMD21J18"
+#define MICROPY_HW_MCU_NAME   "SAMD21J18A"
+
+#define MICROPY_HW_DFLL_USB_SYNC    (1)
diff --git a/ports/samd/boards/SAMD_GENERIC_D21X18/mpconfigboard.mk b/ports/samd/boards/SAMD_GENERIC_D21X18/mpconfigboard.mk
@@ -0,0 +1,4 @@
+MCU_SERIES = SAMD21
+CMSIS_MCU = SAMD21J18A
+LD_FILES = boards/samd21x18a.ld sections.ld
+TEXT0 = 0x2000
diff --git a/ports/samd/boards/SAMD_GENERIC_D21X18/pins.csv b/ports/samd/boards/SAMD_GENERIC_D21X18/pins.csv
@@ -0,0 +1,10 @@
+# The lines contain pairs of Pin name and Pin number.
+# Pin names must be valid Python identifiers.
+# Pin numbers have the form Pxnn, with x being A, B, C or D.
+# Lines starting with # or empty lines are ignored.
+
+USB_DM,PA24
+USB_DP,PA25
+
+SWCLK,PA30
+SWDIO,PA31
