EFM32: Tweaks to get EFM32GG-STK3700 running NSH over LEUART0

configs/efm32-g8xx-stk/README.txt

@@ -179,7 +179,7 @@ SERIAL CONSOLE
 USING THE J-LINK GDB SERVER
 ===========================
 
-   1. Star the J-Link GDB server.  You should see the start-up confiration
+   1. Star the J-Link GDB server.  You should see the start-up configuration
       window.  SelectL
 
       a. Target device = EFM32G880F128
@@ -192,9 +192,9 @@ USING THE J-LINK GDB SERVER
 
       arm-none-eabi-gdb
 
-   4. Connect to the J-Link GDB serer:
+   4. Connect to the J-Link GDB server:
 
-     (gdb) target remote local host
+     (gdb) target remote localhost:2331
 
    5. Load and run nuttx
 

configs/efm32gg-stk3700/README.txt

@@ -84,12 +84,12 @@ LEDs and Buttons
   are connected to the EFM32, and are debounced by RC filters with a time
   constant of 1ms. The buttons are connected to pins PB9 and PB10:
 
-  ------------------------------------- --------------------
-  EFM32 PIN                             BOARD SIGNALS
-  ------------------------------------- --------------------
-  B9/EBI_A03/U1_TX #2                   MCU_PB9  UIF_PB0
-  B10/EBI_A04/U1_RX #2                  MCU_PB10 UIF_PB1
-  ------------------------------------- --------------------
+    ------------------------------------- --------------------
+    EFM32 PIN                             BOARD SIGNALS
+    ------------------------------------- --------------------
+    B9/EBI_A03/U1_TX #2                   MCU_PB9  UIF_PB0
+    B10/EBI_A04/U1_RX #2                  MCU_PB10 UIF_PB1
+    ------------------------------------- --------------------
 
   Buttons are connected to ground so they will read low when closed.
 
@@ -103,6 +103,13 @@ Serial Console
    and the documentation claims that 9600 baud is possible (although
    I am not sure how).
 
+     ---------- ---- ----------- -----------
+     SIGNAL     PGIO EXP Header  Test Point
+     ---------- ---- ----------- -----------
+     LEUART0_TX PD4  Pin 12      TPJ122
+     LEUART0_RX PD5  Pin 14      TPJ123
+     ---------- ---- ----------- -----------
+
    It should also be possible to use UART0 is configured at 115200 8N1
    on pins PE0 and PE1.
 
@@ -115,6 +122,55 @@ Serial Console
    setting the EFM_BC_EN (PF7) line high, and using the lines EFM_BC_TX
    (PE0) and EFM_BC_RX (PE1) for communicating.
 
+USING THE J-LINK GDB SERVER
+===========================
+
+   1. Star the J-Link GDB server.  You should see the start-up configuration
+      window.  SelectL
+
+      a. Target device = EFM32GG990F1024
+      b. Select Target interface = SWD
+
+   2. Press OK.  The GDB server should start and the last message in the Log
+      output should be "Waiting for GDB connection".
+
+   3. In a terminal window, start GDB:
+
+      arm-none-eabi-gdb
+
+   4. Connect to the J-Link GDB server:
+
+     (gdb) target remote localhost:2331
+
+   5. Load and run nuttx
+
+     (gdb) mon halt
+     (gdb) load nuttx
+     (gdb) mon reset go
+
+   I had to tinker with the setup a few times repeating the same steps above
+   before things finally began to work.  Don't know why.
+
+   To debug code already burned into FLASH:
+
+   1. Start the GDB server as above.
+
+   2. In a terminal window, start GDB:
+
+      arm-none-eabi-gdb
+
+   3. Connect to the J-Link GDB serer:
+
+     (gdb) target remote local host
+
+   3. Load the nuttx symbol file, reset, and debug
+
+     (gdb) mon halt
+     (gdb) file nuttx
+     (gdb) mon reset
+     (gdb) s
+     ...
+
 Configurations
 ==============
   Each EFM32 Giant Gecko Starter Kit configuration is maintained in a sub-

configs/efm32gg-stk3700/include/board.h

@@ -251,18 +251,18 @@
  *   U0_RX #1 PE1 MCU_PE1, UART0_TX #1, EFM_BC_TX, BC_UART_TX
  */
 
-#define BOARD_UART0_RX_GPIO        (GPIO_PORTE|GPIO_PIN1)
-#define BOARD_UART0_TX_GPIO        (GPIO_PORTE|GPIO_PIN0)
-#define BOARD_UART0_ROUTE_LOCATION _USART_ROUTE_LOCATION_LOC1
+#define BOARD_UART0_RX_GPIO          (GPIO_PORTE|GPIO_PIN1)
+#define BOARD_UART0_TX_GPIO          (GPIO_PORTE|GPIO_PIN0)
+#define BOARD_UART0_ROUTE_LOCATION   _USART_ROUTE_LOCATION_LOC1
 
 /* LEUART0:
  *
- *   LEU0_RX #0 PD4 Available on TP121 and EXP pin 12
- *   LEU0_TX #0 PD5 Available on TP122 and EXP pin 14
+ *   LEU0_TX #0 PD4 Available on TP122 and EXP pin 12
+ *   LEU0_RX #0 PD5 Available on TP123 and EXP pin 14
  */
 
-#define BOARD_LEUART0_RX_GPIO        (GPIO_PORTD|GPIO_PIN4)
-#define BOARD_LEUART0_TX_GPIO        (GPIO_PORTD|GPIO_PIN5)
+#define BOARD_LEUART0_RX_GPIO        (GPIO_PORTD|GPIO_PIN5)
+#define BOARD_LEUART0_TX_GPIO        (GPIO_PORTD|GPIO_PIN4)
 #define BOARD_LEUART0_ROUTE_LOCATION _LEUART_ROUTE_LOCATION_LOC0
 
 /****************************************************************************

configs/efm32gg-stk3700/nsh/defconfig

@@ -140,6 +140,7 @@ CONFIG_EFM32_HAVE_USART2=y
 CONFIG_EFM32_HAVE_UART0=y
 CONFIG_EFM32_HAVE_UART1=y
 CONFIG_EFM32_HAVE_LEUART1=y
+CONFIG_EFM32_HAVE_OTGFS=y
 # CONFIG_EFM32_USART_ISUART is not set
 # CONFIG_EFM32_USART_ISSPI is not set
 # CONFIG_EFM32_UART is not set