Turn PIC32MXMMB backlight off

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4653 7fd9a85b-ad96-42d3-883c-3090e2eb8679

nuttx/configs/pic32mx7mmb/README.txt

@@ -257,13 +257,20 @@ LEDs
   The Mikroelektronika PIC32MX7 MMB has 3 user LEDs labeled LED0-2 in the
   schematics:
 
+  ---  ----- ---------------------------------------------------------
   PIN  Board Notes
-  ---  ----- --------------------------------
+  ---  ----- ---------------------------------------------------------
   RA0  LED0  Pulled-up, low value illuminates
   RA1  LED1  Pulled-up, low value illuminates
   RD9  LED2  Pulled-up, low value illuminates
+  RA9  LED4  Not available for general use*, indicates MMC/SD activity
+  ---  LED5  Not controllable by software, indicates power-on
 
-  If CONFIG_ARCH_LEDS is defined, then NuttX will control these LEDs as follows:
+  * RA9 is also the SD chip select.  It will illuminate whenever the SD card
+    is selected.  If SD is not used, then LED4 could also be used as a user-
+    controlled LED.
+
+ If CONFIG_ARCH_LEDS is defined, then NuttX will control these LEDs as follows:
 
                             ON                  OFF
   ------------------------- ---- ---- ---- ---- ---- ----

nuttx/configs/pic32mx7mmb/include/board.h

@@ -108,8 +108,12 @@
  * RA0  LED0  Pulled-up, low value illuminates
  * RA1  LED1  Pulled-up, low value illuminates
  * RD9  LED2  Pulled-up, low value illuminates
- * ---  LED4  Not controllable by software, indicates MMC/SD activity
+ * RA9  LED4  Not available for general use*, indicates MMC/SD activity
  * ---  LED5  Not controllable by software, indicates power-on
+ *
+ * * RA9 is also the SD chip select.  It will illuminate whenever the SD card
+ *   is selected.  If SD is not used, then LED4 could also be used as a user-
+ *   controlled LED.
  */
 
 /* LED index values for use with pic32mx_setled() */

nuttx/configs/pic32mx7mmb/src/Makefile

@@ -38,7 +38,7 @@
 CFLAGS		+= -I$(TOPDIR)/sched
 
 ASRCS		= 
-CSRCS		= up_boot.c up_leds.c up_spi.c
+CSRCS		= up_boot.c up_lcd.c up_leds.c up_spi.c
 
 ifeq ($(CONFIG_PIC32MX_USBDEV),y)
 CSRCS		+= up_usbdev.c

nuttx/configs/pic32mx7mmb/src/pic32mx7mmb_internal.h

@@ -55,8 +55,12 @@
  * RA0  LED0  Pulled-up, low value illuminates
  * RA1  LED1  Pulled-up, low value illuminates
  * RD9  LED2  Pulled-up, low value illuminates
- * ---  LED4  Not controllable by software, indicates MMC/SD activity
+ * RA9  LED4  Not available for general use*, indicates MMC/SD activity
  * ---  LED5  Not controllable by software, indicates power-on
+ *
+ * * RA9 is also the SD chip select.  It will illuminate whenever the SD card
+ *   is selected.  If SD is not used, then LED4 could also be used as a user-
+ *   controlled LED.
  */
 
 /* The Mikroelektronika PIC32MX7 MMB has a joystick:
@@ -71,6 +75,14 @@
  *   RA10  JOY-CP  Joystick CP, HDR1 pin 25  Pulled up, low value when closed
  */
 
+/* LCD
+ *
+ * ------ -------- ------------------------- --------------------------------
+ *  GPIO   SIGNAL  BOARD CONNECTION           NOTES
+ * ------ -------- ------------------------- --------------------------------
+ *   RD2   LCD-BLED Backlight Light          Low value turns off
+ */
+
 /****************************************************************************
  * Public Types
  ****************************************************************************/
@@ -116,6 +128,18 @@ EXTERN void weak_function pic32mx_spiinitialize(void);
 EXTERN void pic32mx_ledinit(void);
 #endif
 
+/****************************************************************************
+ * Name: pic32mx_lcdinitialize
+ *
+ * Description:
+ *   Initialize the LCD.  This function should be called early in the boot
+ *   sequence -- even if the LCD is not enabled.  In that case we should
+ *   at a minimum at least disable the LCD backlight.
+ *
+ ****************************************************************************/
+
+EXTERN void pic32mx_lcdinitialize(void);
+
 #undef EXTERN
 #ifdef __cplusplus
 }

nuttx/configs/pic32mx7mmb/src/up_boot.c

@@ -86,6 +86,13 @@ void pic32mx_boardinitialize(void)
     }
 #endif
 
+/* Initialize the LCD.  The LCD initialization function should be called early in the
+ * boot sequence -- even if the LCD is not enabled.  In that case we should
+ * at a minimum at least disable the LCD backlight.
+ */
+
+  pic32mx_lcdinitialize();
+
   /* Configure on-board LEDs if LED support has been selected. */
 
 #ifdef CONFIG_ARCH_LEDS

nuttx/configs/pic32mx7mmb/src/up_lcd.c

@@ -0,0 +1,81 @@
+/****************************************************************************
+ * configs/pic32mx7mmb/src/up_lcd.c
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <debug.h>
+
+#include "pic32mx-internal.h"
+#include "pic32mx7mmb_internal.h"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* LCD
+ *
+ * ------ -------- ------------------------- --------------------------------
+ *  GPIO   SIGNAL  BOARD CONNECTION           NOTES
+ * ------ -------- ------------------------- --------------------------------
+ *   RD2   LCD-BLED Backlight Light          Low value turns off
+ */
+
+#define GPIO_BLED (GPIO_OUTPUT|GPIO_VALUE_ZERO|GPIO_PORTD|GPIO_PIN2)
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: pic32mx_lcdinitialize
+ *
+ * Description:
+ *   Initialize the LCD.  This function should be called early in the boot
+ *   sequendce -- Even if the LCD is not enabled.  In that case we should
+ *   at a minimum at least disable the LCD backlight.
+ *
+ ****************************************************************************/
+
+void pic32mx_lcdinitialize(void)
+{
+  /* Just configure the backlight control as an output and turn off the
+   * backlight for now.
+   */
+
+   pic32mx_configgpio(GPIO_BLED);
+}

nuttx/configs/pic32mx7mmb/src/up_leds.c

@@ -46,12 +46,7 @@
 
 #include <arch/board/board.h>
 
-#include "chip.h"
-#include "up_arch.h"
-#include "up_internal.h"
-
 #include "pic32mx-internal.h"
-#include "pic32mx-ioport.h"
 #include "pic32mx7mmb_internal.h"
 
 /****************************************************************************
@@ -67,11 +62,15 @@
  * RA0  LED0  Pulled-up, low value illuminates
  * RA1  LED1  Pulled-up, low value illuminates
  * RD9  LED2  Pulled-up, low value illuminates
- * ---  LED4  Not controllable by software, indicates MMC/SD activity
+ * RA9  LED4  Not available for general use*, indicates MMC/SD activity
  * ---  LED5  Not controllable by software, indicates power-on
  *
- *  If CONFIG_ARCH_LEDS is defined, then NuttX will control these LEDs as follows:
+ * * RA9 is also the SD chip select.  It will illuminate whenever the SD card
+ *   is selected.  If SD is not used, then LED4 could also be used as a user-
+ *   controlled LED.
  *
+ * If CONFIG_ARCH_LEDS is defined, then NuttX will control these LEDs as
+ * follows:
  *                           ON                  OFF
  * ------------------------- ---- ---- ---- ---- ---- ----
  *                           LED0 LED1 LED2 LED0 LED1 LED2
@@ -89,6 +88,7 @@
 #define GPIO_LED_0   (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTA|GPIO_PIN0)
 #define GPIO_LED_1   (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTA|GPIO_PIN1)
 #define GPIO_LED_2   (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTD|GPIO_PIN9)
+#define GPIO_LED_4   (GPIO_OUTPUT|GPIO_VALUE_ONE|GPIO_PORTA|GPIO_PIN9)
 
 /* LED Management Definitions ***********************************************/