README
======
README for NuttX port to the IMXRT1020-EVK, an IMXRT1020 based
board with various capabilities, featuring the NXP
IMXRT1021DAG5A CPU.
o Processor
- MIMXRT1021DAG5A processor
o Memory
- 256 Mb SDRAM memory
- 64 Mb QSPI Flash
- TF socket for SD card
o Display and Audio
- Audio CODEC
- 4-pole audio headphone jack
- External speaker connection
- Microphone
o Connectivity
- Micro USB host and OTG connectors
- Ethernet (10/100T) connector
- CAN transceivers
- Arduino® interface
Serial Console
==============
The EVK default console is on LPUART1, which is multiplexed onto
the debug port (either OpenSDA or SEGGER JLink).
It runs at 115200,n,8,1.
LEDs and Buttons
================
There is one user accessible LED status indicator located on the 1020-EVK,
USERLED. The function of the LEDs include:
D3: Power (Green) & Overpower (Red)
D5: User LED (Green) GPIO_AD_B0_05
D15: RST LED (Red)
This LED is not used by the board port unless CONFIG_ARCH_LEDS is
defined. In that case, the usage by the board port is defined in
include/board.h and src/imxrt_autoleds.c. The LED is used to encode
OS-related events as documented in board.h
---------------------------------------------------
SYMBOL Meaning USERLED
---------------------------------------------------
LED_STARTED NuttX has been started OFF
LED_HEAPALLOCATE Heap has been allocated OFF
LED_IRQSENABLED Interrupts enabled OFF
LED_STACKCREATED Idle stack created ON
LED_INIRQ In an interrupt N/C
LED_SIGNAL In a signal handler N/C
LED_ASSERTION An assertion failed N/C
LED_PANIC The system has crashed FLASH
LED_IDLE Not used
In addition the LED is illuminated during an interrupt.
This IMXRT board has three external buttons
1. SW2 (IRQ88, ONOFF) Not on a GPIO, No muxing
2. SW3 (IRQ88, POR) Not on a GPIO, No muxing
3. SW4 (IRQ88, USER) Wakeup, GPIO5-0
Configurations
==============
Information Common to All Configurations
----------------------------------------
Each i.MX RT 1020 configuration is maintained in a sub-directory and
can be selected as follow:
tools/configure.sh [OPTIONS] imxrt1020-evk:<subdir>
Where typical options are -l to configure to build on Linux or -c to
configure for Cygwin under Linux. 'tools/configure.sh -h' will show
you all of the options.
Before building, make sure the PATH environment variable include the
correct path to the directory than holds your toolchain binaries.
And then build NuttX by simply typing the following. At the conclusion of
the make, the nuttx binary will reside in an ELF file called, simply, nuttx.
make
The <subdir> that is provided above as an argument to the tools/configure.sh
must be is one of the following.
NOTES:
1. These configurations use the mconf-based configuration tool. To
change any of these configurations using that tool, you should:
a. Build and install the kconfig-mconf tool. See nuttx/README.txt
see additional README.txt files in the NuttX tools repository.
b. Execute 'make menuconfig' in nuttx/ in order to start the
reconfiguration process.
2. Unless stated otherwise, all configurations generate console
output on UART1 (i.e. the multiplexed OpenSDA/JLink serial port).
3. All of these configurations are set up to build under Windows using the
"GNU Tools for ARM Embedded Processors" that is maintained by ARM
(unless stated otherwise in the description of the configuration).
https://developer.arm.com/open-source/gnu-toolchain/gnu-rm
That toolchain selection can easily be reconfigured using
'make menuconfig'. Here are the relevant current settings:
Build Setup:
CONFIG_HOST_WINDOWS=y : Window environment
CONFIG_WINDOWS_CYGWIN=y : Cywin under Windows
System Type -> Toolchain:
CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : GNU ARM EABI toolchain
Configuration sub-directories
-----------------------------
netnsh:
This configuration is similar to the nsh configuration except that is
has networking enabled, both IPv4 and IPv6. This NSH configuration is
focused on network-related testing.
NOTES:
1. LED support is disabled because there is a conflict between the LED
GPIO and PHY pin usage.
2. Telnet is enabled. But since both IPv4 and IPv6 are enabled, it
will default to IPv6. That means that to connect a Telnet session
from a PC, you will need to use the IPv6 address which by defaault
is:
telnet fc00::2
Or, disable IPv4 support so that only IPv4 addressing is used.
3. The network monitor is not enabled in this configuration. As a
result, the Ethernet cable must be connected when the board is
powered up. Otherwise, it will stall for a long period of time
before the NSH prompt appears and you will not be able to used
the board.
nsh:
Configures the NuttShell (nsh) located at examples/nsh. This NSH
configuration is focused on low level, command-line driver testing.
Built-in applications are supported, but none are enabled. This
configuration does not support a network.
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