266 lines
9.4 KiB
Plaintext
266 lines
9.4 KiB
Plaintext
README
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======
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This README file discusses the port of NuttX to the Silicon Labs EFM32™
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Gecko Starter Kit (EFM32-G8XX-STK). The Gecko Starter Kit features:
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• EFM32G890F128 MCU with 128 kB flash and 16 kB RAM
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• 32.768 kHz crystal (LXFO)
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• 32 MHz crystal (HXFO)
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• Advanced Energy Monitoring
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• Touch slider
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• 4x40 LCD
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• 4 User LEDs
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• 2 pushbutton switches
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• Reset button and a switch to disconnect the battery.
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• On-board SEGGER J-Link USB emulator
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• ARM 20 pin JTAG/SWD standard Debug in/out connector
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CONTENTS
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=======
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• Status
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• LEDs
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• Serial Console
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• Using the J-Link GDB Server
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• Configurations
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STATUS
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======
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2014-10-28. At this point all basic boot operations are successful: The
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LEDs work and the application tasks appear to be successfully started.
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LED2 is on and LED0 is glowing (meaning that interrupts are being
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processed). However, I get no output on PE0. Data appears to be sent
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(at least by efm32_lowputc()). However, no signal activity is present
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on PE0.
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2014-10-29: The NuttX is running on the EFM32 Gecko Starter Kit. There
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are not many peripherals to test in that configuration, but the NuttShell
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(NSH) is working over LEUART0 at 2400 baud (certainly that could go up
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to 4800. The documentation says that 9600 is also possible on the
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LEUART, but I am not sure how).
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I originally planned to use UART0 at 115200 baud, but I never could get
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any output from the board. I reviewd my pin configuration and clocking
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carefully and the USART seems to think it is working correctly. So I
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am thinking that there is some board issue that prohibits that option
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(probably because UART0 is used with the board controller???). Pins
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are not available for other U[S]ARTs on the board.
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DMA and USART-based SPI supported are included, but not yet tested.
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2014-10-29: Calibrated the delays loops.
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2014-10-29: The start-up time is long -- about a second. I have traced
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this to the default delay in bringing up the LFCLK in efm32_clockconfig.
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The default, reset setting of the LFXOTIMEOUT field of the CMU_CTRL
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register is 3 which corresponds to a delay of 32768 cycles, or a full
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second. I have not experimented to see if this delay can be reduced.
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LEDs
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====
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The EFM32 Gecko Start Kit has four yellow LEDs. These LEDs are connected
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as follows:
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------------------------------------- --------------------
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EFM32 PIN BOARD SIGNALS
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------------------------------------- --------------------
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C0/USART1_TX#0/PCNT0_S0IN#2/ACMP0_CH0 MCU_PC0 UIF_LED0
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C1/USART1_RX#0/PCNT0_S1IN#2/ACMP0_CH1 MCU_PC1 UIF_LED1
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C2/USART2_TX#0/ACMP0_CH2 MCU_PC2 UIF_LED2
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C3/USART2_RX#0/ACMP0_CH3 MCU_PC3 UIF_LED3
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------------------------------------- --------------------
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All LEDs are grounded and so are illuminated by outputting a high
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value to the LED.
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These LEDs are not used by the board port unless CONFIG_ARCH_LEDS is
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defined. In that case, the usage by the board port is defined in
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include/board.h and src/efm32_autoleds.c. The LEDs are used to
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encode OS-related events as follows:
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SYMBOL Meaning LED0* LED1 LED2 LED3
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----------------- ----------------------- ------ ----- ----- ------
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LED_STARTED NuttX has been started ON OFF OFF OFF
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LED_HEAPALLOCATE Heap has been allocated OFF ON OFF OFF
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LED_IRQSENABLED Interrupts enabled ON ON OFF OFF
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LED_STACKCREATED Idle stack created OFF OFF ON OFF
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LED_INIRQ In an interrupt** ON N/C N/C OFF
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LED_SIGNAL In a signal handler*** N/C ON N/C OFF
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LED_ASSERTION An assertion failed ON ON N/C OFF
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LED_PANIC The system has crashed N/C N/C N/C ON
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LED_IDLE STM32 is is sleep mode (Optional, not used)
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* If LED0, LED1, LED2 are statically on, then NuttX probably failed to boot
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and these LEDs will give you some indication of where the failure was
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** The normal state is LED2 ON and LED3 faintly glowing. This faint glow
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is because of timer interrupt that result in the LED being illuminated
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on a small proportion of the time.
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*** LED1 may also flicker normally if signals are processed.
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SERIAL CONSOLE
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==============
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Pin Availability
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----------------
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The EFM32G890F128 support the following options for serial output. NOTE
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(1) that not all of these pins are available for use as a serial console,
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however. And (2) not all pins made available by the board.
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EFM32 PIN GPIO NOTES/CONFLICTS/AVAILABILITY
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------- -- ---- ----------------------------------------------
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US0_RX #0 PE11 LCD_PE11, LCD_SEG7
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US0_RX #1 PE6 LCD_PE6, LCD_COM2
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US0_RX #2 PC10 UIF_SLIDER2
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US0_TX #0 PE10 LCD_PE10, LCD_SEGG
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US0_TX #1 PE7 LCD_PE7, LCD_COM3
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US0_TX #2 PC11 UIF_SLIDER3
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------- -- ----
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US1_RX #0 PC1 UIF_LED1
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US1_RX #1 PD1 Not connected on this board
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US1_TX #0 PC0 UIF_LED0
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US1_TX #1 PD0 Not connected on this board
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------- -- ----
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US2_RX #0 PC3 UIF_LED3
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US2_RX #1 PB4 LCD_PB4, LCD_SEG21
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US2_TX #0 PC2 UIF_LED2
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US2_TX #1 PB3 LCD_PB3, LCD_SEG20
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------- -- ----
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U0_RX #0 PF7 LCD_PF7, LCD_SEG25
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U0_RX #1 PE1 **AVAILABLE at TP130** (if BC_EN is low, see below)
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U0_RX #2 PA4 LCD_PA4, LCD_SEG17
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U0_RX #3 PC15 MCUDBG_TDO_SWO
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U0_TX #0 PF6 LCD_PF6, LCD_SEG24
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U0_TX #1 PE0 **AVAILABLE at TP129** (if BC_EN is low, see below)
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U0_TX #2 PA3 LCD_PA3, LCD_SEG16
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U0_TX #3 PC14 **AVAILABLE at TP117**
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------- -- ----
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LEU0_RX #0 PD5 **AVAILABLE at TP123 and EXP port pin 14**
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LEU0_RX #1 PB14 CTRLMCU_SPI_MISO
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LEU0_RX #2 PE15 LCD_PE15, LCD_SEG11
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LEU0_TX #0 PD4 **AVAILABLE at TP122 and EXP port pin 12**
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LEU0_TX #1 PB13 CTRLMCU_SPI_SCK
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LEU0_TX #2 PE14 LCD_PE14, LCD_SEG10
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------- -- ----
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LEU1_RX #0 PC7 DEBUG_MCU_SW_ENABLE
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LEU1_RX #1 PA6 DEBUG_TDI_IN
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LEU1_TX #0 PC6 DEBUG_DH_SW_ENABLE
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LEU1_TX #1 PA5 DEBUG_TMS_SWDIO_IN
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------- -- ----
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Default Serial Console
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----------------------
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LEUART0 is configured as the default serial console at 2400 8N1
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on pins PD5 and PD4. It certainly be possible to go to 4800 baud
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and the documentation claims that 9600 baud is possible (although
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I am not sure how).
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It should also be possible to use UART0 is configured at 115200 8N1
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on pins PE0 and PE1. However, my attempts to use USART0 were
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unsuccessful -- I see no activity on PE0 and PE1 and have not yet
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figured out why that is.
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Communication through the Board Controller
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------------------------------------------
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The control MCU acts as a board controller (BC). There is a UART
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connection between the EFM and the BC. The connection is made by
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setting the EFM_BC_EN (PD13) line high. The EFM can then use the BSP to
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send commands to the BC. When EFM_BC_EN is low, EFM_BC_TX and EFM_BC_RX
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can be used by other applications.
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USING THE J-LINK GDB SERVER
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===========================
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1. Star the J-Link GDB server. You should see the start-up configuration
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window. SelectL
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a. Target device = EFM32G880F128
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b. Select Target interface = SWD
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2. Press OK. The GDB server should start and the last message in the Log
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output should be "Waiting for GDB connection".
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3. In a terminal window, start GDB:
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arm-none-eabi-gdb
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4. Connect to the J-Link GDB server:
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(gdb) target remote localhost:2331
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5. Load and run nuttx
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(gdb) mon halt
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(gdb) load nuttx
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(gdb) mon reset go
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I had to tinker with the setup a few times repeating the same steps above
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before things finally began to work. Don't know why.
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To debug code already burned into FLASH:
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1. Start the GDB server as above.
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2. In a terminal window, start GDB:
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arm-none-eabi-gdb
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3. Connect to the J-Link GDB serer:
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(gdb) target remote local host
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3. Load the nuttx symbol file, reset, and debug
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(gdb) mon halt
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(gdb) file nuttx
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(gdb) mon reset
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(gdb) s
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...
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CONFIGURATIONS
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==============
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Each EFM32 Gecko Starter Kit configuration is maintained in a sub-directory
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and can be selected as follow:
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tools/configure.sh efm32-g8xx-stk:<subdir>
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If this is a Windows native build, then configure.bat should be used
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instead of configure.sh:
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configure.bat efm32-g8xx-stk\<subdir>
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Where <subdir> is one of the following:
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nsh:
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---
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Configures the NuttShell (nsh) located at apps/examples/nsh. The
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Configuration enables the serial interfaces on LEUART0 at 2400 8N1.
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NOTES:
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1. This configuration uses the mconf-based configuration tool. To
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change this configuration using that tool, you should:
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a. Build and install the kconfig-mconf tool. See nuttx/README.txt
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see additional README.txt files in the NuttX tools repository.
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b. Execute 'make menuconfig' in nuttx/ in order to start the
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reconfiguration process.
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2. By default, this configuration uses the ARM EABI toolchain
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for Windows and builds under Cygwin (or probably MSYS). That
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can easily be reconfigured, of course.
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CONFIG_HOST_WINDOWS=y : Builds under Windows
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CONFIG_WINDOWS_CYGWIN=y : Using Cygwin
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CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : GNU EABI toolchain for Windows
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