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README ====== This README discusses issues unique to NuttX configurations for the M3 Wildfire development board (STM32F103VET6). See http://firestm32.taobao.com This configuration should support both the version 2 and version 3 of the Wildfire board (using NuttX configuration options). However, only version 2 has been verified. Contents ======== - Pin Configuration - DFU and JTAG - OpenOCD - LEDs - RTC - M3 Wildfire-specific Configuration Options - Configurations Pin Configuration ================= --- ------ -------------- ------------------------------------------------------------------- PIN NAME SIGNAL NOTES --- ------ -------------- ------------------------------------------------------------------- 1 PE2 PE2-C-RCLK Camera (P9) 2 PE3 PE3-USB-M USB2.0 3 PE4 PE4-BEEP LS1 Bell (v2) PE4 10Mbps ENC28J60 Interrupt (v3) 4 PE5 (no name) 10Mbps ENC28J60 Interrupt (v2) PE5 KEY1, Low when closed (pulled high if open) (v3) 5 PE6 6 VBAT BT1 Battery (BT1) 7 PC13 Header 7X2 8 PC14 PC14/OSC32-IN Y2 32.768KHz 9 PC15 PC15/OSC32-OUT Y2 32.768KHz 10 VSS_5 DGND 11 VDD_5 3V3 12 OSC_IN Y1 8MHz 13 OSC_OUT Y1 8MHz 14 NRST REST1 Reset switch 15 PC0 16 PC1 PC1/ADC123-IN11 Potentiometer (R16) 17 PC2 18 PC3 PC3-LED1 LED1, Active low (pulled high) 19 VSSA DGND 20 VREF- DGND 21 VREF+ 3V3 22 VDDA 3V3 23 PA0 PA0-C-VSYNC Camera (P9) 24 PA1 PC1/ADC123-IN1 25 PA2 PA2-US2-TX MAX3232, DB9 D7 --- ------ -------------- ------------------------------------------------------------------- PIN NAME SIGNAL NOTES --- ------ -------------- ------------------------------------------------------------------- 26 PA3 PA3-US2-RX MAX3232, DB9 D7 27 VSS_4 DGND 28 VDD_4 3V3 29 PA4 PA4-SPI1-NSS 10Mbit ENC28J60, SPI 2M FLASH 30 PA5 PA5-SPI1-SCK 2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH 31 PA6 PA6-SPI1-MISO 2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH 32 PA7 PA7-SPI1-MOSI 2.4" TFT + Touchscreen, 10Mbit ENC28J60, SPI 2M FLASH 33 PC4 PC4-LED2 LED2, Active low (pulled high) 34 PC5 PC5-LED3 LED3, Active low (pulled high) 35 PB0 PB0-KEY1 KEY1, Low when closed (pulled high if open) (v2) PB0 Header P5 (v3) 36 PB1 PB1-KEY2 KEY2, Low when closed (pulled high if open) 37 PB2 BOOT1/DGND 38 PE7 PE7-FSMC_D4 2.4" TFT + Touchscreen 39 PE8 PE8-FSMC_D5 2.4" TFT + Touchscreen 40 PE9 PE9-FSMC_D6 2.4" TFT + Touchscreen 41 PE10 PE10-FSMC_D7 2.4" TFT + Touchscreen 42 PE11 PE11-FSMC_D8 2.4" TFT + Touchscreen 43 PE12 PE12-FSMC_D9 2.4" TFT + Touchscreen 44 PE13 PE13-FSMC_D10 2.4" TFT + Touchscreen 45 PE14 PE14-FSMC_D11 2.4" TFT + Touchscreen 46 PE15 PE15-FSMC_D12 2.4" TFT + Touchscreen 47 PB10 PB10-C-DO_2 Camera (P9) 48 PB11 PB11-MP3-RST MP3 PB11-C-DO_3 Camera (P9) 49 VSS_1 DGND 50 VDD_1 3V3 --- ------ -------------- ------------------------------------------------------------------- PIN NAME SIGNAL NOTES --- ------ -------------- ------------------------------------------------------------------- 51 PB12 PB12-SPI2-NSS MP3 PB12-C-DO_4 Camera (P9) 52 PB13 PB13-SPI2-SCK MP3 PB13-C-DO_5 Camera (P9) 53 PB14 PB14-SPI2-MISO MP3 PB14-C-DO_6 Camera (P9) 54 PB15 PB15-SPI2-MOSI MP3 PB15-C-DO_7 Camera (P9) 55 PD8 PD8-FSMC_D13 2.4" TFT + Touchscreen 56 PD9 PD9-FSMC_D14 2.4" TFT + Touchscreen 57 PD10 PD10-FSMC_D15 2.4" TFT + Touchscreen 58 PD11 PD11-FSMC_A16 2.4" TFT + Touchscreen 59 PD12 C-LED_EN Camera (P9) 60 PD13 PD13-LCD/LIGHT 2.4" TFT + Touchscreen 61 PD14 PD14-FSMC_D0 2.4" TFT + Touchscreen 62 PD15 PD15-FSMC_D1 2.4" TFT + Touchscreen 63 PC6 PC6-MP3-XDCS MP3 PC6-C-SIO_C Camera (P9) 64 PC7 PC7-MP3-DREQ MP3 PC7-C-SIO_D Camera (P9) 65 PC8 PC8-SDIO-D0 SD card, pulled high 66 PC9 PC9-SDIO-D1 SD card, pulled high 67 PA8 PA8-C-XCLK Camera (P9) 68 PA9 PA9-US1-TX MAX3232, DB9 D8 69 PA10 PA10-US1-RX MAX3232, DB9 D8 70 PA11 PA11-USBDM USB2.0 71 PA12 PA12-USBDP USB2.0 72 PA13 PA13-JTMS JTAG 73 N/C 74 VSS_2 DGND 75 VDD_2 3V3 --- ------ -------------- ------------------------------------------------------------------- PIN NAME SIGNAL NOTES --- ------ -------------- ------------------------------------------------------------------- 76 PA14 PA14-JTCK JTAG 77 PA15 PA15-JTDI JTAG 78 PC10 PC10-SDIO-D2 SD card, pulled high 79 PC11 PC10-SDIO-D3 SD card, pulled high 80 PC12 PC12-SDIO-CLK SD card 81 PD0 PD0-FSMC_D2 2.4" TFT + Touchscreen 82 PD1 PD1-FSMC_D3 2.4" TFT + Touchscreen 83 PD2 PD2-SDIO-CMD SD card, pulled high 84 PD3 PD3-C-WEN Camera (P9) 85 PD4 PD4-FSMC_NOE 2.4" TFT + Touchscreen 86 PD5 PD5-FSMC_NWE 2.4" TFT + Touchscreen 87 PD6 PD6-C-OE Camera (P9) 88 PD7 PD7-FSMC_NE1 2.4" TFT + Touchscreen 89 PB3 PB3-JTDO JTAG 90 PB4 PB4-NJTRST JTAG 91 PB5 PB5-C-WRST Camera (P9) 92 PB6 PB6-I2C1-SCL 2.4" TFT + Touchscreen, AT24C02 93 PB7 PB7-I2C1-SDA 2.4" TFT + Touchscreen, AT24C02 94 BOOT0 SW3 3V3 or DGND 95 PB8 PB8-CAN-RX CAN tranceiver, Header 2H PB8-C-DO_0 Camera (P9) 96 PB9 PB9-CAN-TX CAN tranceiver, Header 2H PB9-C-DO_1 Camera (P9) 97 PE0 PE0-C-RRST Camera (P9) 98 PE1 PE1-FSMC_NBL1 2.4" TFT + Touchscreen 99 VSS_3 DGND 100 VDD_3 3V3 DFU and JTAG ============ Enbling Support for the DFU Bootloader -------------------------------------- The linker files in these projects can be configured to indicate that you will be loading code using STMicro built-in USB Device Firmware Upgrade (DFU) loader or via some JTAG emulator. You can specify the DFU bootloader by adding the following line: CONFIG_STM32_DFU=y to your .config file. Most of the configurations in this directory are set up to use the DFU loader. If CONFIG_STM32_DFU is defined, the code will not be positioned at the beginning of FLASH (0x08000000) but will be offset to 0x08003000. This offset is needed to make space for the DFU loader and 0x08003000 is where the DFU loader expects to find new applications at boot time. If you need to change that origin for some other bootloader, you will need to edit the file(s) ld.script.dfu for the configuration. The DFU SE PC-based software is available from the STMicro website, http://www.st.com. General usage instructions: 1. Convert the NuttX Intel Hex file (nuttx.hex) into a special DFU file (nuttx.dfu)... see below for details. 2. Connect the M3 Wildfire board to your computer using a USB cable. 3. Start the DFU loader on the M3 Wildfire board. You do this by resetting the board while holding the "Key" button. Windows should recognize that the DFU loader has been installed. 3. Run the DFU SE program to load nuttx.dfu into FLASH. What if the DFU loader is not in FLASH? The loader code is available inside of the Demo dirctory of the USBLib ZIP file that can be downloaded from the STMicro Website. You can build it using RIDE (or other toolchains); you will need a JTAG emulator to burn it into FLASH the first time. In order to use STMicro's built-in DFU loader, you will have to get the NuttX binary into a special format with a .dfu extension. The DFU SE PC_based software installation includes a file "DFU File Manager" conversion program that a file in Intel Hex format to the special DFU format. When you successfully build NuttX, you will find a file called nutt.hex in the top-level directory. That is the file that you should provide to the DFU File Manager. You will end up with a file called nuttx.dfu that you can use with the STMicro DFU SE program. Enabling JTAG ------------- If you are not using the DFU, then you will probably also need to enable JTAG support. By default, all JTAG support is disabled but there NuttX configuration options to enable JTAG in various different ways. These configurations effect the setting of the SWJ_CFG[2:0] bits in the AFIO MAPR register. These bits are used to configure the SWJ and trace alternate function I/Os. The SWJ (SerialWire JTAG) supports JTAG or SWD access to the Cortex debug port. The default state in this port is for all JTAG support to be disable. CONFIG_STM32_JTAG_FULL_ENABLE - sets SWJ_CFG[2:0] to 000 which enables full SWJ (JTAG-DP + SW-DP) CONFIG_STM32_JTAG_NOJNTRST_ENABLE - sets SWJ_CFG[2:0] to 001 which enable full SWJ (JTAG-DP + SW-DP) but without JNTRST. CONFIG_STM32_JTAG_SW_ENABLE - sets SWJ_CFG[2:0] to 010 which would set JTAG-DP disabled and SW-DP enabled The default setting (none of the above defined) is SWJ_CFG[2:0] set to 100 which disable JTAG-DP and SW-DP. OpenOCD ======= I have also used OpenOCD with the M3 Wildfire. In this case, I used the Olimex USB ARM OCD. See the script in boards/fire-stm32v2/tools/oocd.sh for more information. Using the script: 1) Start the OpenOCD GDB server cd <nuttx-build-directory> boards/fire-stm32v2/tools/oocd.sh $PWD 2) Load Nuttx cd <nuttx-built-directory> arm-none-eabi-gdb nuttx gdb> target remote localhost:3333 gdb> mon reset gdb> mon halt gdb> load nuttx 3) Running NuttX gdb> mon reset gdb> c LEDs ==== The M3 Wildfire has 3 LEDs labeled LED1, LED2 and LED3. These LEDs are not used by the NuttX port unless CONFIG_ARCH_LEDS is defined. In that case, the usage by the board port is defined in include/board.h and src/up_autoleds.c. The LEDs are used to encode OS-related events as follows: /* LED1 LED2 LED3 */ #define LED_STARTED 0 /* OFF OFF OFF */ #define LED_HEAPALLOCATE 1 /* ON OFF OFF */ #define LED_IRQSENABLED 2 /* OFF ON OFF */ #define LED_STACKCREATED 3 /* OFF OFF OFF */ #define LED_INIRQ 4 /* NC NC ON (momentary) */ #define LED_SIGNAL 5 /* NC NC ON (momentary) */ #define LED_ASSERTION 6 /* NC NC ON (momentary) */ #define LED_PANIC 7 /* NC NC ON (2Hz flashing) */ #undef LED_IDLE /* Sleep mode indication not supported */ RTC === The STM32 RTC may configured using the following settings. CONFIG_RTC - Enables general support for a hardware RTC. Specific architectures may require other specific settings. CONFIG_RTC_HIRES - The typical RTC keeps time to resolution of 1 second, usually supporting a 32-bit time_t value. In this case, the RTC is used to "seed" the normal NuttX timer and the NuttX timer provides for higher resoution time. If CONFIG_RTC_HIRES is enabled in the NuttX configuration, then the RTC provides higher resolution time and completely replaces the system timer for purpose of date and time. CONFIG_RTC_FREQUENCY - If CONFIG_RTC_HIRES is defined, then the frequency of the high resolution RTC must be provided. If CONFIG_RTC_HIRES is not defined, CONFIG_RTC_FREQUENCY is assumed to be one. CONFIG_RTC_ALARM - Enable if the RTC hardware supports setting of an alarm. A callback function will be executed when the alarm goes off In hi-res mode, the STM32 RTC operates only at 16384Hz. Overflow interrupts are handled when the 32-bit RTC counter overflows every 3 days and 43 minutes. A BKP register is incremented on each overflow interrupt creating, effectively, a 48-bit RTC counter. In the lo-res mode, the RTC operates at 1Hz. Overflow interrupts are not handled (because the next overflow is not expected until the year 2106. WARNING: Overflow interrupts are lost whenever the STM32 is powered down. The overflow interrupt may be lost even if the STM32 is powered down only momentarily. Therefore hi-res solution is only useful in systems where the power is always on. M3 Wildfire-specific Configuration Options ============================================ CONFIG_ARCH - Identifies the arch/ subdirectory. This should be set to: CONFIG_ARCH=arm CONFIG_ARCH_family - For use in C code: CONFIG_ARCH_ARM=y CONFIG_ARCH_architecture - For use in C code: CONFIG_ARCH_CORTEXM3=y CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory CONFIG_ARCH_CHIP=stm32 CONFIG_ARCH_CHIP_name - For use in C code to identify the exact chip: CONFIG_ARCH_CHIP_STM32 CONFIG_ARCH_CHIP_STM32F103VE CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG - Enables special STM32 clock configuration features. CONFIG_ARCH_BOARD_STM32_CUSTOM_CLOCKCONFIG=n CONFIG_ARCH_BOARD - Identifies the boards/ subdirectory and hence, the board that supports the particular chip or SoC. CONFIG_ARCH_BOARD=fire-stm32v2 (for the M3 Wildfire development board) CONFIG_ARCH_BOARD_name - For use in C code CONFIG_ARCH_BOARD_FIRE_STM32V2=y (Version 2) CONFIG_ARCH_BOARD_FIRE_STM32V3=y (Version 3) CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation of delay loops CONFIG_ENDIAN_BIG - define if big endian (default is little endian) CONFIG_RAM_SIZE - Describes the installed DRAM (SRAM in this case): CONFIG_RAM_SIZE=0x00010000 (64Kb) CONFIG_RAM_START - The start address of installed DRAM CONFIG_RAM_START=0x20000000 CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that have LEDs CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt stack. If defined, this symbol is the size of the interrupt stack in bytes. If not defined, the user task stacks will be used during interrupt handling. CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to board architecture. Individual subsystems can be enabled: AHB --- CONFIG_STM32_DMA1 CONFIG_STM32_DMA2 CONFIG_STM32_CRC CONFIG_STM32_FSMC CONFIG_STM32_SDIO APB1 ---- CONFIG_STM32_TIM2 CONFIG_STM32_TIM3 CONFIG_STM32_TIM4 CONFIG_STM32_TIM5 CONFIG_STM32_TIM6 CONFIG_STM32_TIM7 CONFIG_STM32_WWDG CONFIG_STM32_IWDG CONFIG_STM32_SPI2 CONFIG_STM32_SPI4 CONFIG_STM32_USART2 CONFIG_STM32_USART3 CONFIG_STM32_UART4 CONFIG_STM32_UART5 CONFIG_STM32_I2C1 CONFIG_STM32_I2C2 CONFIG_STM32_USB CONFIG_STM32_CAN1 CONFIG_STM32_BKP CONFIG_STM32_PWR CONFIG_STM32_DAC1 CONFIG_STM32_DAC2 CONFIG_STM32_USB APB2 ---- CONFIG_STM32_ADC1 CONFIG_STM32_ADC2 CONFIG_STM32_TIM1 CONFIG_STM32_SPI1 CONFIG_STM32_TIM8 CONFIG_STM32_USART1 CONFIG_STM32_ADC3 Timer and I2C devices may need to the following to force power to be applied unconditionally at power up. (Otherwise, the device is powered when it is initialized). CONFIG_STM32_FORCEPOWER Timer devices may be used for different purposes. One special purpose is to generate modulated outputs for such things as motor control. If CONFIG_STM32_TIMn is defined (as above) then the following may also be defined to indicate that the timer is intended to be used for pulsed output modulation, ADC conversion, or DAC conversion. Note that ADC/DAC require two definition: Not only do you have to assign the timer (n) for used by the ADC or DAC, but then you also have to configure which ADC or DAC (m) it is assigned to. CONFIG_STM32_TIMn_PWM Reserve timer n for use by PWM, n=1,..,8 CONFIG_STM32_TIMn_ADC Reserve timer n for use by ADC, n=1,..,8 CONFIG_STM32_TIMn_ADCm Reserve timer n to trigger ADCm, n=1,..,8, m=1,..,3 CONFIG_STM32_TIMn_DAC Reserve timer n for use by DAC, n=1,..,8 CONFIG_STM32_TIMn_DACm Reserve timer n to trigger DACm, n=1,..,8, m=1,..,2 For each timer that is enabled for PWM usage, we need the following additional configuration settings: CONFIG_STM32_TIMx_CHANNEL - Specifies the timer output channel {1,..,4} NOTE: The STM32 timers are each capable of generating different signals on each of the four channels with different duty cycles. That capability is not supported by this driver: Only one output channel per timer. Alternate pin mappings. The M3 Wildfire board requires only CAN1 remapping On the M3 Wildfire board pin PB9 is wired as TX and pin PB8 is wired as RX. Which then makes the proper connection through the CAN transiver SN65HVD230 out to the CAN D-type 9-pn male connector where pin 2 is CANL and pin 7 is CANH. CONFIG_STM32_TIM1_FULL_REMAP CONFIG_STM32_TIM1_PARTIAL_REMAP CONFIG_STM32_TIM2_FULL_REMAP CONFIG_STM32_TIM2_PARTIAL_REMAP_1 CONFIG_STM32_TIM2_PARTIAL_REMAP_2 CONFIG_STM32_TIM3_FULL_REMAP CONFIG_STM32_TIM3_PARTIAL_REMAP CONFIG_STM32_TIM4_REMAP CONFIG_STM32_USART1_REMAP CONFIG_STM32_USART2_REMAP CONFIG_STM32_USART3_FULL_REMAP CONFIG_STM32_USART3_PARTIAL_REMAP CONFIG_STM32_SPI1_REMAP CONFIG_STM32_SPI3_REMAP CONFIG_STM32_I2C1_REMAP CONFIG_STM32_CAN1_REMAP1 CONFIG_STM32_CAN1_REMAP2 CONFIG_STM32_CAN2_REMAP JTAG Enable settings (by default JTAG-DP and SW-DP are disabled): CONFIG_STM32_JTAG_FULL_ENABLE - Enables full SWJ (JTAG-DP + SW-DP) CONFIG_STM32_JTAG_NOJNTRST_ENABLE - Enables full SWJ (JTAG-DP + SW-DP) but without JNTRST. CONFIG_STM32_JTAG_SW_ENABLE - Set JTAG-DP disabled and SW-DP enabled STM32F103Z specific device driver settings CONFIG_U[S]ARTn_SERIAL_CONSOLE - selects the USARTn (n=1,2,3) or UART m (m=4,5) for the console and ttys0 (default is the USART1). CONFIG_U[S]ARTn_RXBUFSIZE - Characters are buffered as received. This specific the size of the receive buffer CONFIG_U[S]ARTn_TXBUFSIZE - Characters are buffered before being sent. This specific the size of the transmit buffer CONFIG_U[S]ARTn_BAUD - The configure BAUD of the UART. Must be CONFIG_U[S]ARTn_BITS - The number of bits. Must be either 7 or 8. CONFIG_U[S]ARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity CONFIG_U[S]ARTn_2STOP - Two stop bits CONFIG_STM32_SPI_INTERRUPTS - Select to enable interrupt driven SPI support. Non-interrupt-driven, poll-waiting is recommended if the interrupt rate would be to high in the interrupt driven case. CONFIG_STM32_SPI_DMA - Use DMA to improve SPI transfer performance. Cannot be used with CONFIG_STM32_SPI_INTERRUPT. CONFIG_STM32_SDIO_DMA - Support DMA data transfers. Requires CONFIG_STM32_SDIO and CONFIG_STM32_DMA2. CONFIG_STM32_SDIO_PRI - Select SDIO interrupt prority. Default: 128 CONFIG_STM32_SDIO_DMAPRIO - Select SDIO DMA interrupt priority. Default: Medium CONFIG_STM32_SDIO_WIDTH_D1_ONLY - Select 1-bit transfer mode. Default: 4-bit transfer mode. M3 Wildfire CAN Configuration CONFIG_CAN - Enables CAN support (one or both of CONFIG_STM32_CAN1 or CONFIG_STM32_CAN2 must also be defined) CONFIG_CAN_EXTID - Enables support for the 29-bit extended ID. Default Standard 11-bit IDs. CONFIG_CAN_FIFOSIZE - The size of the circular buffer of CAN messages. Default: 8 CONFIG_CAN_NPENDINGRTR - The size of the list of pending RTR requests. Default: 4 CONFIG_CAN_LOOPBACK - A CAN driver may or may not support a loopback mode for testing. The STM32 CAN driver does support loopback mode. CONFIG_STM32_CAN1_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN1 is defined. CONFIG_STM32_CAN2_BAUD - CAN1 BAUD rate. Required if CONFIG_STM32_CAN2 is defined. CONFIG_STM32_CAN_TSEG1 - The number of CAN time quanta in segment 1. Default: 6 CONFIG_STM32_CAN_TSEG2 - the number of CAN time quanta in segment 2. Default: 7 CONFIG_STM32_CAN_REGDEBUG - If CONFIG_DEBUG_FEATURES is set, this will generate an dump of all CAN registers. M3 Wildfire LCD Hardware Configuration CONFIG_LCD_LANDSCAPE - Define for 320x240 display "landscape" support. Default is this 320x240 "landscape" orientation (this setting is informative only... not used). CONFIG_LCD_PORTRAIT - Define for 240x320 display "portrait" orientation support. In this orientation, the M3 Wildfire's LCD ribbon cable is at the bottom of the display. Default is 320x240 "landscape" orientation. CONFIG_LCD_RPORTRAIT - Define for 240x320 display "reverse portrait" orientation support. In this orientation, the M3 Wildfire's LCD ribbon cable is at the top of the display. Default is 320x240 "landscape" orientation. CONFIG_LCD_BACKLIGHT - Define to support a backlight. CONFIG_LCD_PWM - If CONFIG_STM32_TIM1 is also defined, then an adjustable backlight will be provided using timer 1 to generate various pulse widthes. The granularity of the settings is determined by CONFIG_LCD_MAXPOWER. If CONFIG_LCD_PWM (or CONFIG_STM32_TIM1) is not defined, then a simple on/off backlight is provided. CONFIG_LCD_RDSHIFT - When reading 16-bit gram data, there appears to be a shift in the returned data. This value fixes the offset. Default 5. The LCD driver dynamically selects the LCD based on the reported LCD ID value. However, code size can be reduced by suppressing support for individual LCDs using: CONFIG_STM32_AM240320_DISABLE CONFIG_STM32_SPFD5408B_DISABLE Configurations ============== Each M3 Wildfire configuration is maintained in a sub-directory and can be selected as follow: tools/configure.sh fire-stm32v2:<subdir> Where <subdir> is one of the following: nsh --- Configure the NuttShell (nsh) located at examples/nsh. The nsh configuration contains support for some built-in applications that can be enabled by making some additional minor change to the configuration file. Reconfiguring: This configuration uses to the kconfig-mconf configuration tool to control the configuration. See the section entitled "NuttX Configuration Tool" in the top-level README.txt file. Start Delays: If no SD card is present in the slot, or if the network is not connected, then there will be long start-up delays before you get the NSH prompt. If I am focused on ENC28J60 debug, I usually disable MMC/SD so that I don't have to bother with the SD card: CONFIG_STM32_SDIO=n CONFIG_MMCSD=n STATUS: The board port is basically functional. Not all features have been verified. The ENC28J60 network is not yet functional. Networking is enabled by default in this configuration for testing purposes. To use this configuration, the network must currently be disabled. To do this using the kconfig-mconf configuration tool: > make menuconfig Then de-select "Networking Support" -> "Networking Support" UPDATE: The primary problem with the ENC29J60 is a v2 board issue: The SPI FLASH and the ENC28J60 shared the same SPI chip select signal (PA4-SPI1-NSS). In order to finish the debug of the ENC28J60, it may be necessary to lift the SPI FLASH chip select pin from the board.