237 lines
7.7 KiB
Plaintext
237 lines
7.7 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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Testing has just begun. So the status is code-complete but only
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partially tested.
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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 LED1* LED2 LED3 LED4
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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 LED1, LED2, LED3 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 LED3 ON and LED1 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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*** LED2 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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UART0 is configured as the default serial console at 115200 8N1
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on pins PE0 and PE1.
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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 confiration
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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 serer:
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(gdb) target remote local host
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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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cd tools
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./configure.sh efm32-g8xx-stk/<subdir>
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cd -
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. ./setenv.sh
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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 UART0. Support for
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built-in applications is enabled, but in the base configuration no
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built-in applications are selected (see NOTES below).
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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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and misc/tools/
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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 CodeSourcery 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_CODESOURCERYW=y : CodeSourcery for Windows
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