2018-11-17 20:23:03 +01:00
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README
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======
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This directory holds NuttX board support for the Maxim Integrated
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MAX32660-EVSYS board. That board features:
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o MAX32660 Microcontroller
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- Arm Cortex-M4F, 96MHz
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- 256KB Flash Memory
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- 96KB SRAM
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- 16KB Instruction Cache
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- Two SPIs
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- Two I2Cs
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- Two UARTs
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- 14 GPIOs
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o DIP Breakout Board
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- 100mil Pitch Dual Inline Pin Headers
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- Breadboard Compatible
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o Integrated Peripherals
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- Red Indicator LED
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- User Pushbutton
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o MAX32625PICO-Based Debug Adapter
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- CMSIS-DAP SWD Debugger
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- Virtual UART Console
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Contents
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========
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2018-11-22 22:01:18 +01:00
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o Status
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2018-11-17 20:23:03 +01:00
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o Serial Console
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o LEDs and Buttons
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2018-11-22 22:01:18 +01:00
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Status
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======
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2018-11-21: The port is code complete but completely untested. I am
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still waiting to receive hardware to perform the bringup. This initial
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port will support an NSH console: Clock configuration, timer, GPIO
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pin configuration, ICC, and UART. Additional untested drivers are
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complete and ready for testing: DMA, GPIO interrupts, RTC, WDT. The
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following drivers are not implemented: I2C, SPI, I2S.
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2018-11-17 20:23:03 +01:00
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Serial Console
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==============
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2018-11-19 17:47:28 +01:00
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UART1 Tx and Rx signals at port P0.10 and P0.11 are connected to the
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programming and debug header JH2 pins 2 and 3 through 1kΩ resistors.
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This provides a convenient way to communicate with a PC though the
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virtual serial port available in Maxim’s CMSIS-DAP debug adapter. The
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series resistors allow for these signals to be overdriven by other
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circuits without modifying the board.
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2018-11-17 20:23:03 +01:00
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LEDs and Buttons
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================
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LEDs
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----
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A single red LED is available driven by GPIO P0.13.
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This LED is 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/sam_autoleds.c. The LED is used to encode
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OS-related events as follows:
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------------------- ----------------------- ------
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SYMBOL Meaning LED
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------------------- ----------------------- ------
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LED_STARTED NuttX has been started OFF
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LED_HEAPALLOCATE Heap has been allocated OFF
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LED_IRQSENABLED Interrupts enabled OFF
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LED_STACKCREATED Idle stack created ON
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LED_INIRQ In an interrupt N/C
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LED_SIGNAL In a signal handler N/C
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LED_ASSERTION An assertion failed N/C
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LED_PANIC The system has crashed FLASH
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Thus if the LED is statically on, NuttX has successfully booted and is,
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apparently, running normally. If the LED is flashing at approximately
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2Hz, then a fatal error has been detected and the system has halted.
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Buttons
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-------
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An single button is available on GPIO P0.12 for use by software.
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