Atmel SAM4N Xplained Pro User manual

SMART ARM-based Microcontrollers
SAM4N Xplained Pro
USER GUIDE
Preface
The Atmel® SAM4N Xplained Pro evaluation kit is a hardware platform to
evaluate the ATSAM4N16C microcontroller.
Supported by the Atmel Studio integrated development platform, the kit
provides easy access to the features of the Atmel ATSAM4N16C and
explains how to integrate the device in a custom design.
The Xplained Pro MCU series evaluation kits include an on-board
Embedded Debugger, and no external tools are necessary to program or
debug the ATSAM4N16C.
The Xplained Pro extension kits offers additional peripherals to extend the
features of the board and ease the development of custom designs.
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Table of Contents
Preface............................................................................................................................ 1
1. Introduction................................................................................................................3
1.1. Features....................................................................................................................................... 3
1.2. Kit Overview................................................................................................................................. 3
2. Getting Started...........................................................................................................5
2.1. Xplained Pro Quick Start.............................................................................................................. 5
2.2. Design Documentation and Relevant Links................................................................................. 5
3. Xplained Pro.............................................................................................................. 7
3.1. Embedded Debugger................................................................................................................... 7
3.2. Hardware Identification System....................................................................................................8
3.3. Power Sources............................................................................................................................. 8
3.4. Xplained Pro Headers and Connectors........................................................................................9
3.4.1. Xplained Pro Standard Extension Header..................................................................... 9
3.4.2. Xplained Pro Power Header........................................................................................ 10
4. Hardware User Guide.............................................................................................. 11
4.1. Connectors................................................................................................................................. 11
4.1.1. Xplained Pro Standard Extension Headers..................................................................11
4.1.2. Other Headers............................................................................................................. 13
4.1.3. Current Measurement Header..................................................................................... 14
4.2. Peripherals................................................................................................................................. 14
4.2.1. Crystals........................................................................................................................14
4.2.2. Mechanical Buttons..................................................................................................... 15
4.2.3. LED..............................................................................................................................15
4.2.4. Analog Reference........................................................................................................ 15
4.3. Embedded Debugger Implementation........................................................................................15
4.3.1. Serial Wire Debug........................................................................................................16
4.3.2. Virtual COM Port..........................................................................................................16
4.3.3. Atmel Data Gateway Interface.....................................................................................16
5. Appendix..................................................................................................................18
5.1. Getting Started with IAR.............................................................................................................18
6. Hardware Revision History and Known Issues........................................................21
6.1. Identifying Product ID and Revision........................................................................................... 21
6.2. Revision 2...................................................................................................................................21
7. Document Revision History..................................................................................... 22
8. Evaluation Board/Kit Important Notice.....................................................................23
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1. Introduction
1.1. Features
•Atmel ATSAM4N16C microcontroller
•Embedded debugger (EDBG)
–USB interface
–Programming and debugging (target) through Serial Wire Debug (SWD)
–Virtual COM-port interface to target via UART
–Atmel Data Gateway Interface (DGI) to target via synchronous USART or TWI
–Four GPIOs connected to target for code instrumentation
•Digital I/O
–Two mechanical buttons (user and reset button)
–One user LED
–Three extension headers
–Three spare signal headers
•Two possible power sources
–External power
–Embedded debugger USB
•12MHz crystal
•32kHz crystal
1.2. Kit Overview
The Atmel SAM4N Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel
ATSAM4N16C.
The kit offers a set of features that enables the ATSAM4N16C user to get started using the
ATSAM4N16C peripherals right away and to get an understanding of how to integrate the device in their
own design.
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Figure 1-1. SAM4N Xplained Pro Evaluation Kit Overview
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2. Getting Started
2.1. Xplained Pro Quick Start
Steps to start exploring the Atmel Xplained Pro platform:
1. Download Atmel Studio.
2. Launch Atmel Studio.
3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the DEBUG USB
port on the kit.
When the Xplained Pro MCU kit is connected to your computer for the first time, the operating system will
perform a driver software installation. The driver file supports both 32- and 64-bit versions of Microsoft®
Windows® XP, Windows Vista®, Windows 7, Windows 8, Windows 10, and Windows Server 2012.
Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will auto
detect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will present
relevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also has
the option to launch Atmel Software Framework (ASF) example applications for the kit. The SAM4N
device is programmed and debugged by the on-board Embedded Debugger and therefore no external
programmer or debugger tool is needed.
2.2. Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for the SAM4N Xplained
Pro.
•Xplained products - Atmel Xplained evaluation kits are a series of easy-to-use evaluation kits for
Atmel microcontrollers and other Atmel products. For low pin-count devices the Xplained Nano
series provides a minimalistic solution with access to all I/O pins of the target microcontroller.
Xplained Mini kits are for medium pin-count devices and adds Arduino Uno compatible header
footprint and a prototyping area. Xplained Pro kits are for medium to high pin-count devices, they
features advanced debugging and standardized extensions for peripheral functions. All these kits
have on board programmers/debuggers which creates a set of low-cost boards for evaluation and
demonstration of features and capabilities of different Atmel products.
•Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
•Atmel sample store - Atmel sample store where you can order samples of devices.
•EDBG User Guide - User guide containing more information about the on-board Embedded
Debugger.
•IAR Embedded Workbench® for ARM® - This is a commercial C/C++ compiler that is available for
ARM®. There is a 30 day evaluation version as well as a code size limited kick-start version
available from their website. The code size limit is 16KB for devices with M0, M0+, and M1 cores
and 32KB for devices with other cores.
•Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizing
data. Data Visualizer can receive data from various sources such as the Embedded Debugger Data
Gateway Interface found on Xplained Pro boards and COM ports.
•Hardware Users Guide in PDF format - PDF version of this User Guide.
•Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,
3D plots, layer plots etc.
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•SAM4N Xplained Pro on the Atmel website - Atmel website link.
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3. Xplained Pro
Xplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. The
platform consists of a series of Microcontroller (MCU) boards and extension boards, which are integrated
with Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support data
streaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards,
which are connected through a set of standardized headers and connectors. Each extension board has
an identification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.
This information is used to present relevant user guides, application notes, datasheets, and example
code through Atmel Studio.
3.1. Embedded Debugger
The SAM4N Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board debugging. The
EDBG is a composite USB device of three interfaces; a debugger, Virtual COM Port, and a Data Gateway
Interface (DGI).
Together with Atmel Studio, the EDBG debugger interface can program and debug the ATSAM4N16C.
On SAM4N Xplained Pro, the SWD interface is connected between the EDBG and the ATSAM4N16C.
The Virtual COM Port is connected to a UART on the ATSAM4N16C and provides an easy way to
communicate with the target application through terminal software. It offers variable baud rate, parity, and
stop bit settings. Note that the settings on the ATSAM4N16C must match the settings given in the
terminal software.
Info: The virtual COM port in the EDBG requires the terminal software to set the data terminal
ready (DTR) signal to enable the UART pins connected to the ATSAM4N16C. If the DTR signal
is not enabled the UART pins on the EDBG is kept in high-z (tristate) rendering the COM port
unusable. The DTR signal is set automatically by some terminal software, but it may have to be
manually enabled in your terminal.
The DGI consists of several physical interfaces for communication with the host computer.
Communication over the interfaces is bidirectional. It can be used to send events and values from the
ATSAM4N16C or as a generic printf-style data channel. Traffic over the interfaces can be timestamped on
the EDBG for more accurate tracing of events. Note that timestamping imposes an overhead that reduces
maximal throughput. Atmel Data Visualizer is used to send and receive data through DGI.
The EDBG controls two LEDs on SAM4N Xplained Pro; a power LED and a status LED. The table below
shows how the LEDs are controlled in different operation modes.
Table 3-1. EDBG LED Control
Operation mode Power LED Status LED
Normal operation Power LED is lit when power is
applied to the board.
Activity indicator, LED flashes
when any communication
happens to the EDBG.
Bootloader mode (idle) The power LED and the status LED blinks simultaneously.
Bootloader mode (firmware
upgrade)
The power LED and the status LED blinks in an alternating pattern.
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For further documentation on the EDBG, see the EDBG User Guide.
3.2. Hardware Identification System
All Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication™ chip
mounted. This chip contains information that identifies the extension with its name and some extra data.
When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and
sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,
code examples, and links to relevant documents. The table below shows the data fields stored in the ID
chip with example content.
Table 3-2. Xplained Pro ID Chip Content
Data field Data type Example content
Manufacturer ASCII string Atmel'\0'
Product Name ASCII string Segment LCD1 Xplained Pro'\0'
Product Revision ASCII string 02'\0'
Product Serial Number ASCII string 1774020200000010’\0’
Minimum Voltage [mV] uint16_t 3000
Maximum Voltage [mV] uint16_t 3600
Maximum Current [mA] uint16_t 30
3.3. Power Sources
The SAM4N Xplained Pro kit can be powered by several power sources as listed in the table below.
Table 3-3. Power Sources for SAM4N Xplained Pro
Power input Voltage requirements Current requirements Connector marking
External power 5V ±2% (±100mV) for
USB host operation.
4.3V to 5.5V if USB host
operation is not
required.
Recommended
minimum is 1A to be
able to provide enough
current for connected
USB devices and the
board itself.
Recommended
maximum is 2A due to
the input protection
maximum current
specification.
PWR
Embedded debugger
USB
4.4V to 5.25V (according
to USB spec.)
500mA (according to
USB spec.)
DEBUG USB
The kit will automatically detect which power sources are available and choose which one to use
according to the following priority:
1. External power.
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2. Embedded Debugger USB.
Info: External power is required when 500mA from a USB connector is not enough to power
the board with possible extension boards.
3.4. Xplained Pro Headers and Connectors
3.4.1. Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU
boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all
pins are not always connected. All connected pins follow the defined pin-out description in the table
below.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU
boards or to access the pins of the target MCU on Xplained Pro MCU boards directly.
Table 3-4. Xplained Pro Standard Extension Header
Pin number Name Description
1 ID Communication line to the ID chip on an extension board
2 GND Ground
3 ADC(+) Analog to digital converter, alternatively positive part of differential
ADC
4 ADC(-) Analog to digital converter, alternatively negative part of differential
ADC
5 GPIO1 General purpose I/O
6 GPIO2 General purpose I/O
7 PWM(+) Pulse width modulation, alternatively positive part of differential
PWM
8 PWM(-) Pulse width modulation, alternatively negative part of differential
PWM
9 IRQ/GPIO Interrupt request line and/or general purpose I/O
10 SPI_SS_B/
GPIO
Slave select for SPI and/or general purpose I/O
11 I2C_SDA Data line for I2C interface. Always implemented, bus type.
12 I2C_SCL Clock line for I2C interface. Always implemented, bus type.
13 UART_RX Receiver line of target device UART
14 UART_TX Transmitter line of target device UART
15 SPI_SS_A Slave select for SPI. Should preferably be unique.
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Pin number Name Description
16 SPI_MOSI Master out slave in line of serial peripheral interface. Always
implemented, bus type.
17 SPI_MISO Master in slave out line of serial peripheral interface. Always
implemented, bus type.
18 SPI_SCK Clock for serial peripheral interface. Always implemented, bus type.
19 GND Ground
20 VCC Power for extension board
3.4.2. Xplained Pro Power Header
The power header can be used to connect external power to the SAM4N Xplained Pro kit. The kit will
automatically detect and switch to any external power if supplied. The power header can also be used as
supply for external peripherals or extension boards. Care must be taken not to exceed the total current
limitation of the on-board regulator when using the 3.3V pin.
Table 3-5. Xplained Pro Power Header
Pin number Pin name Description
1 VEXT_P5V0 External 5V input
2 GND Ground
3 VCC_P5V0 Unregulated 5V (output, derived from one of the input sources)
4 VCC_P3V3 Regulated 3.3V (output, used as main power supply for the kit)
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4. Hardware User Guide
4.1. Connectors
This chapter describes the implementation of the relevant connectors and headers on SAM4N Xplained
Pro and their connection to the ATSAM4N16C. The tables of connections in this chapter also describes
which signals are shared between the headers and on-board functionality.
4.1.1. Xplained Pro Standard Extension Headers
The SAM4N Xplained Pro headers EXT1, EXT2, and EXT3 offers access to the I/O of the microcontroller
in order to expand the board e.g. by connecting extensions to the board. These headers all comply with
the Xplained Pro standard extension header. All headers have a pitch of 2.54mm.
Table 4-1. Extension Header EXT1
Pin on EXT1 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on
extension board
2 - - GND
3 PA17 AD0
4 PA18 AD1
5 PA24 GPIO
6 PA25 GPIO SPARE HEADER2
7 PC23 TIOA3 SPARE HEADER2
8 PC24 TIOB3 SPARE HEADER2
9 PA0 WKUP0
10 PA23 GPIO
11 PA3 TWD0 EXT3
12 PA4 TWCK0 EXT3, SPARE HEADER1
13 PA21 RXD1
14 PA22 TXD1
15 PA11 NPCS0
16 PA13 SPI_MOSI EXT2, EXT3
17 PA12 SPI_MISO EXT2, EXT3
18 PA14 SPI_SCK EXT2, EXT3
19 - - GND
20 - - VCC
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Table 4-2. Extension Header EXT2
Pin on EXT2 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on
extension board
2 - - GND
3 PA19 AD2
4 PA20 AD3
5 PC0 GPIO
6 PC1 GPIO
7 PC26 TIOA4
8 PC27 TIOB4
9 PA1 WKUP1
10 PC8 GPIO
11 PB0 TWD2 EDBG
12 PB1 TWCK2 EDBG
13 PA5 RXD0
14 PA6 TXD0
15 PC4 NPCS1
16 PA13 SPI_MOSI EXT1, EXT3
17 PA12 SPI_MISO EXT1, EXT3
18 PA14 SPI_SCK EXT1, EXT3
19 - - GND
20 - - VCC
Table 4-3. Extension Header EXT3
Pin on EXT3 SAM4N pin Function Shared functionality
1 - - Communication line to ID chip on
extension board
2 - - GND
3 PC29 AD13
4 PC30 AD14
5 PC2 GPIO
6 PC3 GPIO
7 PA26 TIOA2
8 PA27 TIOB2
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Pin on EXT3 SAM4N pin Function Shared functionality
9 PB2 WKUP12
10 PB3 GPIO
11 PA3 TWD0 EXT1
12 PA4 TWCK0 EXT1, SPARE HEADER1
13 PB10 URXD3
14 PB11 UTXD3
15 PC7 NPCS2
16 PA13 SPI_MOSI EXT1, EXT2
17 PA12 SPI_MISO EXT1, EXT2
18 PA14 SPI_SCK EXT1, EXT2
19 - - GND
20 - - VCC
4.1.2. Other Headers
In addition to the Xplained Pro standard extension headers, SAM4N Xplained Pro has three additional
headers with spare signals that offers access to the I/O of the microcontroller that are otherwise not easily
available elsewhere or might be favorable to have collected together. All headers have a pitch of 2.54mm.
Table 4-4. SPARE SIGNALS Header 1
Pin on header SAM4N pin Function Shared functionality
1 PA4 TWCK0 EXT1, EXT3
2 PA28 TCLK1
3 PA29 TCLK2
4 PC25 TCLK3
5 PC28 TCLK4
6 PC31 TCLK5
7 PC16 PCK0
8 PC17 PCK1
9 PA31 PCK2
10 PB4 PWM2
11 - - VCC
12 - - GND
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Table 4-5. SPARE SIGNALS Header 2
Pin on header SAM4N pin Function Shared functionality
1 PA15 UTXD2
2 PA16 URXD2
3 PC5 GPIO
4 PC6 GPIO
5 PC11 GPIO
6 PC22 GPIO
7 PC23 TIOA3 EXT1
8 PC24 TIOB3 EXT1
9 PA25 GPIO EXT1
10 PC12 AD12
11 - - VCC
12 - - GND
Table 4-6. SPARE SIGNALS Header 3
Pin on header SAM4N pin Function Shared functionality
1 PC13 AD10
2 PC15 AD11
3 PA2 DATRG
4 PB13 DAC0
5 - - VCC
6 - - GND
4.1.3. Current Measurement Header
An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of
the SAM4N Xplained Pro. All power to the ATSAM4N16C is routed through this header. To measure the
power consumption of the device remove the jumper and replace it with an ammeter.
Caution: Removing the jumper from the pin-header while the kit is powered may cause the
ATSAM4N16C to be powered through its I/O pins. This may cause permanent damage to the
device.
4.2. Peripherals
4.2.1. Crystals
The SAM4N Xplained Pro kit contains two crystals that can be used as clock sources for the SAM4N
device. Each crystal has a cut-strap next to it that can be used to measure the oscillator safety factor.
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This is done by cutting the strap and adding a resistor across the strap. More information about oscillator
allowance and safety factor can be found in applicaton note AVR4100. Calculations for the selected
crystal can be found in the schematics documentation of the board.
Table 4-7. External 32.768kHz Crystal
Pin on SAM4N Function
PA7 XIN32
PA8 XOUT32
Table 4-8. External 12MHz Crystal
Pin on SAM4N Function
PB9 XIN
PB8 XOUT
4.2.2. Mechanical Buttons
SAM4N Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the
SAM4N reset line and the other is a generic user configurable button. When a button is pressed it will
drive the I/O line to GND.
Table 4-9. Mechanical Buttons
Pin on SAM4N Silkscreen text
NRST RESET
PA30 SW0
4.2.3. LED
There is one yellow LED available on the SAM4N Xplained Pro board that can be turned on and off. The
LED can be activated by driving the connected I/O line to GND.
Table 4-10. LED Connections
Pin on SAM4N LED
PB14 Yellow LED0
4.2.4. Analog Reference
The ADVREF is available on a 2-pin header to measure the analog reference voltage of the SAM4N
device.
Info: The ADREF pin can only be used for measuring and must not be used as an input for an
external voltage reference.
4.3. Embedded Debugger Implementation
SAM4N Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug
the ATSAM4N16C using Serial Wire Debug (SWD). The Embedded Debugger also include a Virtual Com
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port interface over UART, an Atmel Data Gateway Interface over SPI and TWI and it monitors four of the
SAM4N GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger.
4.3.1. Serial Wire Debug
The Serial Wire Debug (SWD) interface use two pins to communicate with the target. For further
information on how to use the programming and debugging capabilities of the EDBG, see the EDBG user
guide.
Table 4-11. SWD Connections
Pin on SAM4N Function
PB7 SWD clock
PB6 SWD data
PB5 SWD trace output
PB12 Erase
4.3.2. Virtual COM Port
The Embedded Debugger act as a Virtual Com Port gateway by using one of the ATSAM4N16C UARTs.
For further information on how to use the Virtual COM port, see the EDBG user guide.
Table 4-12. Virtual COM Port Connections
Pin on SAM4N Function
PA10 UART TXD (SAM4N TX line)
PA9 UART RXD (SAM4N RX line)
4.3.3. Atmel Data Gateway Interface
The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a USART or
TWI port. The DGI can be used to send a variety of data from the SAM4N to the host PC. For further
information on how to use the DGI interface, see the EDBG user guide.
Table 4-13. DGI Interface Connections When Using USART
Pin on SAM4N Function
PC10 USART TXD (SAM4N TX line)
PC9 USART RXD (SAM4N RX line)
PC14 USART CLK
Table 4-14. DGI Interface Connections When Using TWI
Pin on SAM4N Function
PB0 SDA (Data line)
PB1 SCL (Clock line)
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time
stamp pin value changes. This makes it possible to accurately time stamp events in the SAM4N
application code. For further information on how to configure and use the GPIO monitoring features, see
the EDBG user guide.
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Table 4-15. GPIO Lines Connected To the EDBG
Pin on SAM4N Function
PC21 GPIO0
PC20 GPIO1
PC19 GPIO2
PC18 GPIO3
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5. Appendix
5.1. Getting Started with IAR
IAR Embedded Workbench® for ARM® is a proprietary high efficiency compiler not based on GCC.
Programming and debugging of Xplained Pro kits are supported in IAR™ Embedded Workbench for ARM
using the common CMSIS-DAP interface. Some initial settings have to be set up in the project to get the
programming and debugging to work.
The following steps will explain how to get your project ready for programming and debugging:
1. Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the
project.
2. In the category General Options, select the Target tab. Select the device for the project or, if not
listed, the core of the device.
3. In the category Debugger, select the Setup tab. Select CMSIS DAP as the driver.
4. In the category Debugger, select the Download tab. Check the check box for Use flash loader(s)
option.
5. In the category Debugger > CMSIS DAP, select the Setup tab. Select System (default) as the
reset method.
6. In the category Debugger > CMSIS DAP, select the JTAG/SWD tab. Select SWD as the interface
and optionally select the SWD speed.
Figure 5-1. Select Target Device
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Figure 5-2. Select Debugger
Figure 5-3. Configure Flash Loader
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Figure 5-4. Configure Reset
Figure 5-5. Configure Interface
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