README
======
README for NuttX port to Adafruit NRF52 Feather boards.
Contents
========
- Status
- Feather nRF52 board
- Configurations
Status
======
This is the current status of the NRF52 port:
- The basic OS test configuration and the basic NSH configurations
are present and fully verified. This includes: SYSTICK system time,
pin and GPIO configuration, and serial console support.
Feather nRF52 board
===================
https://www.adafruit.com/product/3406
Console
-------
The Feather nRF52 default console is the UART0.
The Feather nRF52 have USB serial bridge chip on board and UART0 is
connected to micro USB connector through the bridge chip.
LEDs
----
The Feather has 2 user-controllable LEDs
LED MCU
LED1 PIN0-17
LED2 PIN0-19
A high output illuminates the LED.
Pushbuttons
-----------
The Feather nRF52 does not have user-controllable buttons. The reset button
on the board is connected to nRF52832 reset pin directly.
Memory Map
==========
Block Start Length
Name Address
--------------------- ---------- ------
FLASH 0x00000000 512K
RAM 0x20000000 64K
Configurations
==============
Each configuration is maintained in a sub-directory and can be selected as
follow:
tools/configure.sh nrf52-feather:<subdir>
Where <subdir> is one of the following:
<board>-nsh:
-----------
This configuration is the NuttShell (NSH) example at examples/nsh/.
NOTES:
1. This configuration uses the mconf-based configuration tool. To
change this 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.
CONFIG_ARCH_LEDS
----------------
If CONFIG_ARCH_LEDS is defined, the LED will be controlled as follows
for NuttX debug functionality (where NC means "No Change").
TBD!
If CONFIG_ARCH_LEDS is not defined, then the LEDs are completely under
control of the application. The following interfaces are then available
for application control of the LEDs:
uint32_t board_userled_initialize(void);
void board_userled(int led, bool ledon);
void board_userled_all(uint32_t ledset);
