From 861170bc008c97e6ebf3685520661eb6f87d4b9c Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Sun, 24 Mar 2013 20:40:40 +0000
Subject: [PATCH] Fix LM4F120 LaunchPad serial output.  Add support for all 7
 LM4F120 UARTs

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5782 42af7a65-404d-4744-a932-0658087f49c3
---
 configs/lm4f120-launchpad/README.txt      | 45 +++++++++++++++++++++++
 configs/lm4f120-launchpad/include/board.h |  7 ++++
 2 files changed, 52 insertions(+)

diff --git a/configs/lm4f120-launchpad/README.txt b/configs/lm4f120-launchpad/README.txt
index e998ef3b74..54fb6c52f0 100644
--- a/configs/lm4f120-launchpad/README.txt
+++ b/configs/lm4f120-launchpad/README.txt
@@ -15,6 +15,7 @@ Contents
   NuttX OABI "buildroot" Toolchain
   NXFLAT Toolchain
   LEDs
+  Serial Console
   USB Device Controller Functions
   Using OpenOCD and GDB with an FT2232 JTAG emulator
   LM4F120 LaunchPad Configuration Options
@@ -466,6 +467,50 @@ LEDs
   - In the event of a fatal crash, the BLUE and GREEN components will be
     extinguished and the RED component will FLASH at a 2Hz rate.
 
+Serial Console
+^^^^^^^^^^^^^^
+
+  By default, all configurations use UART0 which connects to the USB VCOM
+  on the DEBUG port on the LM4F120 LaunchPad:
+
+    UART0 RX - PA.0
+    UART0 TX - PA.1
+
+  However, if you use an external RS232 driver, then other options are
+  available.  UART1 has option pin settings and flow control capabilities
+  that are not available with the other UARTS::
+
+    UART1 RX - PB.0 or PC.4 (Need disambiguation in board.h)
+    UART1 TX - PB.1 or PC.5 ("  " "            " "" "     ")
+
+    UART1_RTS - PF.0 or PC.4
+    UART1_CTS - PF.1 or PC.5
+
+  NOTE: board.h currently selects PB.0, PB.1, PF.0 and PF.1 for UART1, but
+  that can be changed by editting board.h
+
+  UART2-5, 7 are also available, UART2 is not recommended because it shares
+  some pin usage with USB device mode.  UART6 is not available because its
+  only RX/TX pin options are dedicated to USB support.
+
+    UART2 RX - PD.6
+    UART2 TX - PD.7 (Also used for USB VBUS detection)
+
+    UART3 RX - PC.6
+    UART3 TX - PC.7
+
+    UART4 RX - PC.4
+    UART4 TX - PC.5
+
+    UART5 RX - PE.4
+    UART5 TX - PE.5
+
+    UART6 RX - PD.4, Not available.  Dedicated for USB_DM
+    UART6 TX - PD.5, Not available.  Dedicated for USB_DP
+
+    UART7 RX - PE.0
+    UART7 TX - PE.1
+
 USB Device Controller Functions
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
diff --git a/configs/lm4f120-launchpad/include/board.h b/configs/lm4f120-launchpad/include/board.h
index aa1d93ea07..2a88506a61 100644
--- a/configs/lm4f120-launchpad/include/board.h
+++ b/configs/lm4f120-launchpad/include/board.h
@@ -158,6 +158,13 @@
 #define BUTTON_SW1_BIT    (1 << BUTTON_SW1)
 #define BUTTON_SW2_BIT    (1 << BUTTON_SW2)
 
+/* Pin Multiplexing Disambiguation **************************************************/
+
+#define GPIO_UART1_CTS    GPIO_UART1_CTS_1
+#define GPIO_UART1_RTS    GPIO_UART1_RTS_1
+#define GPIO_UART1_RX     GPIO_UART1_RX_1
+#define GPIO_UART1_TX     GPIO_UART1_TX_1
+
 /************************************************************************************
  * Public Function Prototypes
  ************************************************************************************/