175 lines
5.9 KiB
Plaintext
175 lines
5.9 KiB
Plaintext
README
|
|
======
|
|
|
|
This README file discusses the port of NuttX to the Atmel SAM V71 Xplained
|
|
Ultra Evaluation Kit (SAMV71-XULT). This board features the ATSAMV71Q21 Cortex-M7
|
|
microcontroller.
|
|
|
|
Contents
|
|
========
|
|
|
|
- Board Features
|
|
- Serial Console
|
|
- LEDs and Buttons
|
|
- Configurations
|
|
|
|
Board Features
|
|
==============
|
|
|
|
- ATSAMV71Q21 microcontroller: Cortex-M7, 300MHz, 2MiB FLASH, 384KiB SRAM,
|
|
I/D-caches
|
|
- One mechanical reset button
|
|
- One power switch button
|
|
- Two mechanical user pushbuttons
|
|
- Two yellow user LEDs
|
|
- Supercap backup
|
|
- 12.0 MHz crystal
|
|
- 32.768 kHz crystal
|
|
- 2 MB SDRAM
|
|
- 2 MB QSPI Flash
|
|
- IEEE 802.3az 10Base-T/100Base-TX Ethernet RMII PHY
|
|
- AT24MAC402 256KByte EEPROM with EUI-48 address
|
|
- WM8904 stereo audio codec
|
|
- ATA6561 CAN Transceiver
|
|
- SD Card connector with SDIO support
|
|
- Camera interface connector
|
|
- MediaLB connector
|
|
- Two Xplained Pro extension headers
|
|
- One Xplained Pro LCD header
|
|
- Coresight 20 connector for 4-bit ETM
|
|
- Arduino due compatible shield connectors
|
|
- External debugger connector
|
|
- USB interface, device and host mode
|
|
- Embedded Debugger with Data Gateway Interface and Virtual COM port (CDC)
|
|
- External power input (5-14V) or USB powered
|
|
|
|
See the Atmel webite for further information about this board:
|
|
|
|
- http://www.atmel.com/tools/atsamv71-xult.aspx
|
|
|
|
Serial Console
|
|
==============
|
|
|
|
The SAMV71-XULT has no on-board RS-232 drivers so it will be necessary to
|
|
use either the VCOM or an external RS-232 driver. Here are some options.
|
|
|
|
- Arduino Serial Shield: One option is to use an Arduino-compatible
|
|
serial shield. This will use the RXD and TXD signals available at pins
|
|
0 an 1, respectively, of the Arduino "Digital Low" connector. On the
|
|
SAMV71-XULT board, this corresponds to UART3:
|
|
|
|
------ ------ ------- ------- --------
|
|
Pin on SAMV71 Arduino Arduino SAMV71
|
|
J503 PIO Name Pin Function
|
|
------ ------ ------- ------- --------
|
|
1 PD28 RX0 0 URXD3
|
|
2 PD30 TX0 1 UTXD3
|
|
------ ------ ------- ------- --------
|
|
|
|
- SAMV7-XULT EXTn connectors. USART pins are also available the EXTn
|
|
connectors. The following are labelled in the User Guide for USART
|
|
functionality:
|
|
|
|
---- -------- ------ --------
|
|
EXT1 EXTI1 SAMV71 SAMV71
|
|
Pin Name PIO Function
|
|
---- -------- ------ --------
|
|
13 USART_RX PB00 RXD0
|
|
14 USART_TX PB01 TXD0
|
|
|
|
---- -------- ------ --------
|
|
EXT2 EXTI2 SAMV71 SAMV71
|
|
Pin Name PIO Function
|
|
---- -------- ------ --------
|
|
13 USART_RX PA21 RXD1
|
|
14 USART_TX PB04 TXD1
|
|
|
|
- VCOM. The Virtual Com Port gateway is available on USART1:
|
|
|
|
------ --------
|
|
SAMV71 SAMV71
|
|
PIO Function
|
|
------ --------
|
|
PB04 TXD1
|
|
PA21 RXD1
|
|
------ --------
|
|
|
|
Any of these options can be selected as the serial console by:
|
|
|
|
1. Enabling the UART/USART peripheral in the
|
|
"System Type -> Peripheral Selection" menu, then
|
|
2. Configuring the peripheral in the "Drivers -> Serial Configuration"
|
|
menu.
|
|
|
|
LEDs and Buttons
|
|
================
|
|
|
|
LEDs
|
|
----
|
|
There are two yellow LED available on the SAM V71 Xplained Ultra board that
|
|
can be turned on and off. The LEDs can be activated by driving the
|
|
connected I/O line to GND.
|
|
|
|
------ ----------- ---------------------
|
|
SAMV71 Function Shared functionality
|
|
PIO
|
|
------ ----------- ---------------------
|
|
PA23 Yellow LED0 EDBG GPIO
|
|
PC09 Yellow LED1 LCD, and Shield
|
|
------ ----------- ---------------------
|
|
|
|
These LEDs are 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/sam_autoleds.c. The LEDs are used to encode
|
|
OS-related events as follows:
|
|
|
|
------------------- ----------------------- -------- --------
|
|
SYMBOL Meaning LED state
|
|
LED0 LED1
|
|
------------------- ----------------------- -------- --------
|
|
LED_STARTED NuttX has been started OFF OFF
|
|
LED_HEAPALLOCATE Heap has been allocated OFF OFF
|
|
LED_IRQSENABLED Interrupts enabled OFF OFF
|
|
LED_STACKCREATED Idle stack created ON OFF
|
|
LED_INIRQ In an interrupt No change
|
|
LED_SIGNAL In a signal handler No change
|
|
LED_ASSERTION An assertion failed No change
|
|
LED_PANIC The system has crashed N/C Blinking
|
|
LED_IDLE MCU is is sleep mode Not used
|
|
------------------- ----------------------- -------- --------
|
|
|
|
Thus if LED0 is statically on, NuttX has successfully booted and is,
|
|
apparently, running normally. If LED1 is flashing at approximately
|
|
2Hz, then a fatal error has been detected and the system has halted.
|
|
|
|
NOTE: That LED0 is not used after completion of booting and may
|
|
be used by other board-specific logic.
|
|
|
|
Buttons
|
|
-------
|
|
SAM V71 Xplained Ultra contains three mechanical buttons. One button is the
|
|
RESET button connected to the SAM V71 reset line and the others are generic
|
|
user configurable buttons. When a button is pressed it will drive the I/O
|
|
line to GND.
|
|
|
|
------ ----------- ---------------------
|
|
SAMV71 Function Shared functionality
|
|
PIO
|
|
------ ----------- ---------------------
|
|
RESET RESET Trace, Shield, and EDBG
|
|
PA09 SW0 EDBG GPIO and Camera
|
|
PB12 SW1 EDBG SWD and Chip Erase
|
|
------ ----------- ---------------------
|
|
|
|
NOTES:
|
|
|
|
- There are no pull-up resistors connected to the generic user buttons so
|
|
it is necessary to enable the internal pull-up in the SAM V71 to use the
|
|
button.
|
|
- PB12 is set up as a system flash ERASE pin when the firmware boots. To
|
|
use the SW1, PB12 has to be configured as a normal regular I/O pin in
|
|
the MATRIX module. For more information see the SAM V71 datasheet.
|
|
|
|
Configurations
|
|
==============
|