Add to nuttx apps a simple app to test spi slave driver.

examples/spislv_test/CMakeLists.txt

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+# ##############################################################################
+# apps/examples/spislv_test/CMakeLists.txt
+#
+# 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.
+#
+# ##############################################################################
+
+if(CONFIG_EXAMPLES_SPISLV)
+  nuttx_add_application(
+    NAME
+    ${CONFIG_EXAMPLES_SPISLV_PROGNAME}
+    SRCS
+    spislv_test.c
+    STACKSIZE
+    ${CONFIG_EXAMPLES_SPISLV_STACKSIZE}
+    PRIORITY
+    ${CONFIG_EXAMPLES_SPISLV_PRIORITY})
+endif()

examples/spislv_test/Kconfig

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+#
+# For a description of the syntax of this configuration file,
+# see the file kconfig-language.txt in the NuttX tools repository.
+#
+
+config EXAMPLES_SPISLV
+	tristate "\"SPI Slave Test\" example"
+	default n
+	---help---
+		Enable the "SPI Slave Test" example. 
+		This tool can be used together with the SPI tool to validate communication between two devices.
+
+if EXAMPLES_SPISLV
+
+config EXAMPLES_SPISLV_PROGNAME
+	string "Program name"
+	default "spislv"
+	---help---
+		This is the name of the program that will be used when the NSH ELF
+		program is installed.
+
+config EXAMPLES_SPISLV_PRIORITY
+	int "Spislv task priority"
+	default 100
+
+config EXAMPLES_SPISLV_STACKSIZE
+	int "Spislv stack size"
+	default DEFAULT_TASK_STACKSIZE
+
+endif

examples/spislv_test/Make.defs

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+############################################################################
+# apps/examples/spislv/Make.defs
+#
+# 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.
+#
+############################################################################
+
+ifneq ($(CONFIG_EXAMPLES_SPISLV),)
+CONFIGURED_APPS += $(APPDIR)/examples/spislv_test
+endif

examples/spislv_test/Makefile

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+############################################################################
+# apps/examples/spislv_test/Makefile
+#
+# 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.
+#
+############################################################################
+
+include $(APPDIR)/Make.defs
+
+# SPI SLAVE TEST built-in application info
+
+PROGNAME  = $(CONFIG_EXAMPLES_SPISLV_PROGNAME)
+PRIORITY  = $(CONFIG_EXAMPLES_SPISLV_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_SPISLV_STACKSIZE)
+MODULE    = $(CONFIG_EXAMPLES_SPISLV)
+
+# SPI SLAVE TEST Example
+
+MAINSRC = spislv_test.c
+
+include $(APPDIR)/Application.mk

examples/spislv_test/spislv_test.c

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+/****************************************************************************
+ * apps/examples/spislv_test/spislv_test.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 <nuttx/config.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define SOURCE_FILE "/dev/spislv2"
+#define BUFFER_SIZE 256
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * spislv_test
+ ****************************************************************************/
+
+int main(int argc, FAR char *argv[])
+{
+  int fd;
+  char buffer[BUFFER_SIZE];
+  ssize_t bytes_read;
+  ssize_t i;
+
+  printf("Slave started!!\n");
+  fd = open(SOURCE_FILE, O_RDWR);
+
+  if (fd < 0)
+    {
+      printf("Failed to open %s: %s\n", SOURCE_FILE, strerror(errno));
+      return 0;
+    }
+
+  while (1)
+    {
+      /* Read the number from the source file */
+
+      printf("Slave: Reading from %s\n", SOURCE_FILE);
+      bytes_read = read(fd, buffer, BUFFER_SIZE - 1);
+
+      if (bytes_read < 0)
+        {
+          printf("Failed to read from %s: %s\n",
+                    SOURCE_FILE, strerror(errno));
+          close(fd);
+          return 0;
+        }
+      else if (bytes_read > 0)
+        {
+          buffer[bytes_read] = '\0';
+
+          /* Print buffer in hexadecimal format */
+
+          printf("Slave: Read value in hex: ");
+          for (i = 0; i < bytes_read; ++i)
+            {
+              printf("%02x ", (unsigned char)buffer[i]);
+            }
+
+          printf("\n");
+
+          /* Write the same value back */
+
+          printf("Slave: Writing %d bytes back to %s\n",
+                    bytes_read, SOURCE_FILE);
+          ssize_t bytes_written = write(fd, buffer, bytes_read);
+          if (bytes_written < 0)
+            {
+              printf("Failed to write to %s: %s\n",
+                        SOURCE_FILE, strerror(errno));
+              close(fd);
+              return 0;
+            }
+        }
+    }
+}