165 lines
6.4 KiB
Plaintext
165 lines
6.4 KiB
Plaintext
README
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======
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This directory holds NuttX board support for the TI LaunchXL-CC1312R1.
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Contents
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========
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o Status
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o Serial Console
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o LEDs and Buttons
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o Version 1 or 2?
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o Running from SRAM
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o Using J-Link
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Status
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======
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2018-12-03: Fragmentary board support in place. The initial intent
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of this board support is simply to assist in the CC13xx architecture
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development. Serious board development will occur later. Board
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support is missing LED and button support.
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2019-02-10: Figured out how to connect J-Link and began debug.
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2019-02-12: A little progress. I do make it all the way into NSH, but
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with no console input.
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2019-02-13: NSH is now fully functional.
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2019-02-17: My plan was to include develop an IEEE 802.15.4 driver
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using the interface code for the Cortex-M0 co-processor. Unfortunately,
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that interface code is a part of the TI153STACK. The source for that
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stack is included in the SDK. However, it looks like the licensing on
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that code will prevent that (it is not BSD compatible). That is a shame;
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I only want the Cortex-M0 interface, not TI's stack (NuttX has its own
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IEEE 802.15.4 stack).
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NOTE: This does not prevent you as an end-user from using the TI154STACK;
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it only prevents me from re-distributing any part of it.
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Serial Console
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==============
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The on-board XDS110 Debugger provide a USB virtual serial console using
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UART0 (DIO2_RXD and DIO3_TXD).
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A J-Link debugger is used (see below), then the RXD/TXD jumper pins can
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be used to support a serial console through these same pins via an
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appropriate TTL level adapater (RS-232 or USB serial).
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LEDs and Buttons
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================
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LEDs
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----
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The LaunchXL-cc1312R1 has two LEDs controlled by software: DIO7_GLED (CR1)
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and DIO6_RLED (CR2). A high output value illuminates an LED.
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DIO7_GLED CR1 High output illuminuates
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DIO6_RLED CR2 High output illuminuates
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If CONFIG_ARCH_LEDS is not defined, then the user can control the LEDs in
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any way. The definitions provided in the board.h header file can be used
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to access individual LEDs.
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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/cc1312_autoleds.c. The LEDs are used to encode
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OS-related events as follows:
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SYMBOL Meaning LED state
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GLED RLED
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------------------ ------------------------ ------ ------
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LED_STARTED NuttX has been started OFF OFF
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LED_HEAPALLOCATE Heap has been allocated OFF ON
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LED_IRQSENABLED Interrupts enabled OFF ON
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LED_STACKCREATED Idle stack created ON OFF
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LED_INIRQ In an interrupt N/C GLOW
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LED_SIGNAL In a signal handler N/C GLOW
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LED_ASSERTION An assertion failed N/C GLOW
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LED_PANIC The system has crashed OFF Blinking
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LED_IDLE MCU is is sleep mode Not used
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Thus iF GLED is statically on, NuttX has successfully booted and is,
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apparently, running normally. A soft glow of the RLED means that the
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board is taking interrupts. If GLED is off and GLED is flashing at
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approximately 2Hz, then a fatal error has been detected and the system
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has halted.
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Buttons
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-------
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The LaunchXL-CC1312R1 has two push-puttons:
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DIO13_BTN1 SW1 Low input sensed when depressed
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DIO14_BTN2 SW2 Low input sensed when depressed
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Version 1 or 2?
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===============
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Two versions of the CC1312R1 are supported selected by CONFIG_ARCH_CHIP_CC13XX_V1
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or CONFIG_ARCH_CHIP_CC13XX_V2. How can you tell which one you have?
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Perhaps you can tell by the markings on the chip, but I do not have the
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secret decoder ring necessary to do that.
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What you can do is enable CONFIG_DEBUG_ASSERTIONS. The firmware can
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determine which version you have by looking at register contents. The
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firmware will assert if you select the wrong version. If that occurs,
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switch to the other version and the assertion should go away.
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Running from SRAM
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=================
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The LaunchXL-CC1312R1 port supports execution from RAM. Execution from
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SRAM as a "safe" way to bring up a new board port without concern about
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borking the board because of a bad FLASH image.
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if CONFIG_BOOT_RUNFROMFLASH=y is set in the configuration, then the code
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will build to run from FLASH. Otherwise (presumably CONFIG_BOOT_RUNFROMSRAM=y)
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the code will build to run from SRAM. This is determined by the Make.defs
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file in the scripts/ sub-directory. Based on those configuration
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settings, either scripts/flash.ld or sram.ld will be selected as the
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linker script file to be used.
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Using J-Link
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============
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Reference https://wiki.segger.com/CC1310_LaunchPad (for the CC1310 but also
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applies to the CC1312R1):
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When shipped, the TI CC1312R1 LaunchPad evaluation board is configured to be
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used with the on-board debug probe. In order to use it with J-Link, the
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on-board debug probe needs to be isolated to make sure that it does not
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drive the debug signals. This can be done by removing some jumpers next
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to the XDS110 Out / CC1310 In connector [RXD, TXD, RST, TMS, TCK, TDO, TDI,
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SWO]. After isolating the on-board probe, the CC1312R1 device can be
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debugged using J-Link. The J-Link needs to be connected to the board
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using the micro JTAG connector marked "Target In".
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I use the Olimex ARM-JTAG-20-10 to interface with the board:
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https://www.olimex.com/Products/ARM/JTAG/ARM-JTAG-20-10/
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NOTE: When connecting the J-Link GDB server, the interface must be set to
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JTAG, not SWD as you might expect.
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The RXD/TXD pins, DIO2_RXD and DIO3_TXD, can then support a Serial console
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using the appropriate TTL adapter (TTL to RS-232 or TTL to USB serial).
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One odd behavior that I have found is after a reset from the J-Link, the
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SP and PC registers are not automatically set and I had to manually set
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them as shown below:
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(gdb) target remote localhost:2331
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(gdb) mon reset
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(gdb) mon halt
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(gdb) file nuttx
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(gdb) mon memu32 0
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Reading from address 0x00000000 (Data = 0x20001950)
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(gdb) mon memu32 4
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Reading from address 0x00000004 (Data = 0x00000139)
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(gdb) mon reg sp 0x20001950
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Writing register (SP = 0x20001950)
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(gdb) mon reg pc 0x00000139
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Writing register (PC = 0x00000139)
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(gdb) n
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232 cc13xx_trim_device();
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