From 52096aeb80a4f90995c42d2509de58e3305193ef Mon Sep 17 00:00:00 2001
From: Theo <theo.martin@wandercraft.eu>
Date: Fri, 22 Sep 2023 15:34:30 +0200
Subject: [PATCH] Add activation of SPI0 on arduino due

---
 boards/arm/sam34/arduino-due/include/board.h  |  5 ++
 boards/arm/sam34/arduino-due/src/Makefile     |  4 ++
 .../arm/sam34/arduino-due/src/sam_bringup.c   | 19 ++++++++
 boards/arm/sam34/arduino-due/src/sam_spidev.c | 46 +++++++++++++++++++
 4 files changed, 74 insertions(+)
 create mode 100644 boards/arm/sam34/arduino-due/src/sam_spidev.c

diff --git a/boards/arm/sam34/arduino-due/include/board.h b/boards/arm/sam34/arduino-due/include/board.h
index dab441f593..d026978c40 100644
--- a/boards/arm/sam34/arduino-due/include/board.h
+++ b/boards/arm/sam34/arduino-due/include/board.h
@@ -131,6 +131,11 @@
 
 #define BOARD_FWS                  4
 
+/* Serial Peripheral Interface (SPI) */
+
+#define GPIO_SPI0_SPCK GPIO_SPI0_SPCK_1
+#define GPIO_SPI0_CS   (GPIO_OUTPUT | GPIO_CFG_DEFAULT | GPIO_OUTPUT_SET | GPIO_PORT_PIOC | GPIO_PIN21)
+
 /* LED definitions **********************************************************/
 
 /*  There are three user-controllable LEDs on board the Arduino Due board:
diff --git a/boards/arm/sam34/arduino-due/src/Makefile b/boards/arm/sam34/arduino-due/src/Makefile
index 37665e80cc..21b8eb37fc 100644
--- a/boards/arm/sam34/arduino-due/src/Makefile
+++ b/boards/arm/sam34/arduino-due/src/Makefile
@@ -49,4 +49,8 @@ ifeq ($(CONFIG_BOARDCTL),y)
 CSRCS += sam_appinit.c
 endif
 
+ifeq ($(CONFIG_SAM34_SPI0),y)
+CSRCS += sam_spidev.c
+endif
+
 include $(TOPDIR)/boards/Board.mk
diff --git a/boards/arm/sam34/arduino-due/src/sam_bringup.c b/boards/arm/sam34/arduino-due/src/sam_bringup.c
index ab17323292..414c85b47b 100644
--- a/boards/arm/sam34/arduino-due/src/sam_bringup.c
+++ b/boards/arm/sam34/arduino-due/src/sam_bringup.c
@@ -30,10 +30,12 @@
 #include <nuttx/board.h>
 #include <nuttx/fs/fs.h>
 #include <nuttx/leds/userled.h>
+#include <nuttx/spi/spi_transfer.h>
 
 #include "arduino-due.h"
 
 #include <arch/board/board.h>
+#include "sam_spi.h"
 
 /****************************************************************************
  * Pre-processor Definitions
@@ -138,6 +140,23 @@ int sam_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_SAM34_SPI0
+  sam_configgpio(GPIO_SPI0_CS);
+
+  struct spi_dev_s *spi;
+  spi = sam_spibus_initialize(0);
+
+  if (!spi)
+    {
+      syslog(LOG_ERR, "ERROR: Failed to initialize SPI port 0\n");
+      return -1;
+    }
+  else
+    {
+      spi_register(spi, 0);
+    }
+#endif
+
   UNUSED(ret);
   return OK;
 }
diff --git a/boards/arm/sam34/arduino-due/src/sam_spidev.c b/boards/arm/sam34/arduino-due/src/sam_spidev.c
new file mode 100644
index 0000000000..96055b054e
--- /dev/null
+++ b/boards/arm/sam34/arduino-due/src/sam_spidev.c
@@ -0,0 +1,46 @@
+/****************************************************************************
+ * boards/arm/sam34/arduino-due/src/sam_spidev.c
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <debug.h>
+#include <arch/board/board.h>
+
+#include "sam_spi.h"
+#include "hardware/sam3x_pinmap.h"
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+void sam_spi0select(uint32_t devid, bool selected)
+{
+  spiinfo("devid: %08x CS: %s\n",
+          (unsigned int)devid, selected ? "assert" : "de-assert");
+  sam_gpiowrite(GPIO_SPI0_CS, !selected);
+}
+
+uint8_t sam_spi0status(struct spi_dev_s *dev, uint32_t devid)
+{
+  spiinfo("Returning nothing\n");
+  return 0;
+}