Add support for the Grove LCD RGB

The Grove LCD RGB display is a monochrome LCD display
with a color backlight. This example program used libupm
to write a message on the display.

BUG=none
Change-Id: Ifdca7e48bf2431beeab45250b73115b4c399b263
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>

2 files changed, 154 insertions, 0 deletions

diff --git a/peripheral/displays/Grove_LCD_RGB/Android.mk b/peripheral/displays/Grove_LCD_RGB/Android.mk
new file mode 100644
index 0000000..5432ac0
--- /dev/null
+++ b/peripheral/displays/Grove_LCD_RGB/Android.mk
@@ -0,0 +1,31 @@
+#
+# Copyright (C) 2015 The Android Open Source Project
+#
+# Licensed 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.
+#
+
+LOCAL_PATH := $(call my-dir)
+
+# Example app to drive the Grove LCD RGB Backlight display
+# This will work for any display sufficiently similar to the JHD1313m1
+
+include $(CLEAR_VARS)
+LOCAL_CPPFLAGS:= -Wno-unused-parameter -fexceptions
+LOCAL_CFLAGS += -DLOG_TAG=\"groveLCD\" -Wno-unused-parameter
+LOCAL_SHARED_LIBRARIES := libcutils libupm libmraa
+
+LOCAL_MODULE := example-display-grove-lcd
+LOCAL_MODULE_TAGS := optional
+LOCAL_SRC_FILES := groveLCD.cpp
+include $(BUILD_EXECUTABLE)
+
diff --git a/peripheral/displays/Grove_LCD_RGB/groveLCD.cpp b/peripheral/displays/Grove_LCD_RGB/groveLCD.cpp
new file mode 100644
index 0000000..490ddcb
--- /dev/null
+++ b/peripheral/displays/Grove_LCD_RGB/groveLCD.cpp
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed 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.
+ */
+
+/*
+ * This is an example to display text on the Grove
+ * LCD RGB Display panel.
+ */
+
+#include <jhd1313m1.h>
+
+#include <getopt.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <string>
+
+#define DEFAULT_COLOR_RED    255
+#define DEFAULT_COLOR_GREEN  255
+#define DEFAULT_COLOR_BLUE   255
+#define DEFAULT_DISPLAY_TEXT "hello world"
+
+// Structure to hold the decoded command line options
+struct pgm_options {
+  uint8_t      red, blue, green;
+  std::string  display_text;
+};
+
+// Be sure to keep the options for longopts and shortopts in the same order
+// so that Usage() is correct.
+static struct option longopts[] = {
+  {"help",  no_argument,        NULL,   '?'},
+  {"text",  required_argument,  NULL,   't'},
+  {"red",   no_argument,        NULL,   'r'},
+  {"green", no_argument,        NULL,   'g'},
+  {"blue",  no_argument,        NULL,   'b'},
+  {NULL,    0,                  NULL,    0 }
+};
+static char shortopts[] = "?t:rgb";
+
+// Describes the options for this program.
+void Usage(char *pgm_name) {
+  printf("Usage: %s [options...]\n", pgm_name);
+  printf("Prints a message on the Grove LCD RGB Display\n");
+  printf("Options:\n");
+  for (int i = 0, j = 0; longopts[i].name; i++, j++) {
+    if (shortopts[j] == ':')
+      j++;
+    printf(" --%-6s or -%c\n", longopts[i].name, shortopts[j]);
+  }
+  return;
+}
+
+// Processes all command line options.
+//   sets the options members for commnd line options
+//   returns (0) on success, -1 otherwise.
+int ReadOpts(int argc, char **argv, struct pgm_options *options) {
+  int  ch = 0;
+  bool color_specified = false;
+
+  while ((ch = getopt_long(argc, argv, shortopts, longopts, NULL)) != -1) {
+    switch (ch) {
+      case 'r':
+        options->red = 255;
+        color_specified = true;
+        break;
+      case 'g':
+        options->green = 255;
+        color_specified = true;
+        break;
+      case 'b':
+        options->blue = 255;
+        color_specified = true;
+        break;
+      case 't':
+        options->display_text = optarg;
+        break;
+      default:
+        Usage(argv[0]);
+        return -1;
+    }
+  }
+  argc -= optind;
+  argv += optind;
+
+  if (!color_specified) {
+    options->red   = DEFAULT_COLOR_RED;
+    options->green = DEFAULT_COLOR_GREEN;
+    options->blue  = DEFAULT_COLOR_BLUE;
+  }
+  if (options->display_text.length() == 0)
+    options->display_text = DEFAULT_DISPLAY_TEXT;
+
+  return 0;
+}
+
+int main(int argc, char* argv[]) {
+  pgm_options options = {0, 0, 0, ""};
+
+  if (ReadOpts(argc, argv, &options) < 0)
+    return 1;
+
+  // TODO(bjbeare): auto-detect the bus via mraa.
+  upm::Jhd1313m1 display(6);
+  display.write(options.display_text.c_str());
+  display.setColor(options.red, options.green, options.blue);
+  sleep(5);
+
+  display.displayOff();
+  return 0;
+}