2 files changed, 35 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/lpc17xx/Kconfig b/nuttx/arch/arm/src/lpc17xx/Kconfig
index 82b830a14..923964dad 100644
--- a/nuttx/arch/arm/src/lpc17xx/Kconfig
+++ b/nuttx/arch/arm/src/lpc17xx/Kconfig
@@ -654,6 +654,14 @@ config LPC17_LCD_TFTPANEL
 		display panels require the digital color value of each pixel to be
 		applied to the display data inputs.
 
+config LPC17_LCD_MONOCHROME
+	bool "Monochrome LCD"
+	default n
+	depends on !LPC17_LCD_TFTPANEL
+	---help---
+		STN LCD monochrome/color selection.  Selects monochrome LCD.  This
+		selection has no meaning for a TFT panel.
+
 choice
 	prompt "Bits per pixel"
 	default LPC17_LCD_BPP24 if LPC17_LCD_TFTPANEL
@@ -673,6 +681,7 @@ config LPC17_LCD_BPP8
 
 config LPC17_LCD_BPP16
 	bool "16 bit per pixel"
+	depends on !LPC17_LCD_MONOCHROME
 
 config LPC17_LCD_BPP24
 	bool "24 bit per pixel"
@@ -680,9 +689,11 @@ config LPC17_LCD_BPP24
 
 config LPC17_LCD_BPP16_565
 	bool "16 bpp, 5:6:5 mode"
+	depends on !LPC17_LCD_MONOCHROME
 
 config LPC17_LCD_BPP12_444
 	bool "12 bpp, 4:4:4 mode"
+	depends on !LPC17_LCD_MONOCHROME
 
 endchoice
 
diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_lcd.c b/nuttx/arch/arm/src/lpc17xx/lpc17_lcd.c
index c10d8ade7..dccc10404 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_lcd.c
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_lcd.c
@@ -563,6 +563,30 @@ int up_fbinitialize(void)
   regval &= ~LCD_CTRL_BGR;
   putreg32(regval, LPC17_LCD_CTRL);
 
+  /* Select monochrome or color LCD */
+
+#ifdef CONFIG_LPC17_LCD_MONOCHROME
+  /* Select monochrome LCD */
+
+  regval &= ~LCD_CTRL_BGR;
+  putreg32(regval, LPC17_LCD_CTRL);
+
+  /* Select 4- or 8-bit monochrome interface */
+
+#if LPC17_BPP > 4
+  regval |= LCD_CTRL_LCDMONO8;
+#else
+  regval &= ~LCD_CTRL_LCDMONO8;
+#endif
+  putreg32(regval, LPC17_LCD_CTRL);
+
+#else
+  /* Select color LCD */
+
+  regval &= ~(LCD_CTRL_LCDBW | LCD_CTRL_LCDMONO8);
+  putreg32(regval, LPC17_LCD_CTRL);
+#endif
+
   /* Little endian byte order */
 
   regval &= ~LCD_CTRL_BEBO;