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zephyr/boards/arm/mps2_an385/doc/index.rst

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.. _mps2_an385_board:
ARM V2M MPS2
############
Overview
********
The mps2_an385 board configuration is used by Zephyr applications that run on
the V2M MPS2 board. It provides support for the ARM Cortex-M3 (AN385) CPU and
the following devices:
- Nested Vectored Interrupt Controller (NVIC)
- System Tick System Clock (SYSTICK)
- Cortex-M System Design Kit UART
.. image:: img/mps2_an385.png
:width: 442px
:align: center
:height: 335px
:alt: ARM V2M MPS2
More information about the board can be found at the `V2M MPS2 Website`_.
The Application Note AN385 can be found at `Application Note AN385`_.
Hardware
********
ARM V2M MPS2 provides the following hardware components:
- ARM Cortex-M3 (AN385)
- ARM IoT Subsystem for Cortex-M
- Form factor: 140x120cm
- SRAM: 8MB single cycle SRAM, 16MB PSRAM
- Video: QSVGA touch screen panel, 4bit RGB VGA connector
- Audio: Audio Codec
- Debug:
- ARM JTAG20 connector
- ARM parallel trace connector (MICTOR38)
- 20 pin Cortex debug connector
- 10 pin Cortex debug connector
- ILA connector for FPGA debug
- Expansion
- GPIO
- SPI
Supported Features
==================
The mps2_an385 board configuration supports the following hardware features:
+-----------+------------+-------------------------------------+
| Interface | Controller | Driver/Component |
+===========+============+=====================================+
| NVIC | on-chip | nested vector interrupt controller |
+-----------+------------+-------------------------------------+
| SYSTICK | on-chip | systick |
+-----------+------------+-------------------------------------+
| UART | on-chip | serial port-polling; |
| | | serial port-interrupt |
+-----------+------------+-------------------------------------+
| GPIO | on-chip | gpio |
+-----------+------------+-------------------------------------+
| WATCHDOG | on-chip | watchdog |
+-----------+------------+-------------------------------------+
| TIMER | on-chip | counter |
+-----------+------------+-------------------------------------+
| DUALTIMER | on-chip | counter |
+-----------+------------+-------------------------------------+
Other hardware features are not currently supported by the port.
See the `V2M MPS2 Website`_ for a complete list of V2M MPS2 board hardware
features.
The default configuration can be found in the defconfig file:
.. code-block:: console
boards/arm/mps2_an385/mps2_an385_defconfig
Interrupt Controller
====================
MPS2 is a Cortex-M3 based SoC and has 15 fixed exceptions and 45 IRQs.
A Cortex-M3/4-based board uses vectored exceptions. This means each exception
calls a handler directly from the vector table.
Handlers are provided for exceptions 1-6, 11-12, and 14-15. The table here
identifies the handlers used for each exception.
+------+------------+----------------+--------------------------+
| Exc# | Name | Remarks | Used by Zephyr Kernel |
+======+============+================+==========================+
| 1 | Reset | | system initialization |
+------+------------+----------------+--------------------------+
| 2 | NMI | | system fatal error |
+------+------------+----------------+--------------------------+
| 3 | Hard fault | | system fatal error |
+------+------------+----------------+--------------------------+
| 4 | MemManage | MPU fault | system fatal error |
+------+------------+----------------+--------------------------+
| 5 | Bus | | system fatal error |
+------+------------+----------------+--------------------------+
| 6 | Usage | undefined | system fatal error |
| | fault | instruction, | |
| | | or switch | |
| | | attempt to ARM | |
| | | mode | |
+------+------------+----------------+--------------------------+
| 11 | SVC | | context switch and |
| | | | software interrupts |
+------+------------+----------------+--------------------------+
| 12 | Debug | | system fatal error |
| | monitor | | |
+------+------------+----------------+--------------------------+
| 14 | PendSV | | context switch |
+------+------------+----------------+--------------------------+
| 15 | SYSTICK | | system clock |
+------+------------+----------------+--------------------------+
Pin Mapping
===========
The ARM V2M MPS2 Board has 4 GPIO controllers. These controllers are responsible
for pin muxing, input/output, pull-up, etc.
All GPIO controller pins are exposed via the following sequence of pin numbers:
- Pins 0 - 15 are for GPIO 0
- Pins 16 - 31 are for GPIO 1
- Pins 32 - 47 are for GPIO 2
- Pins 48 - 51 are for GPIO 3
Mapping from the ARM MPS2 Board pins to GPIO controllers:
.. hlist::
:columns: 3
- D0 : EXT_0
- D1 : EXT_4
- D2 : EXT_2
- D3 : EXT_3
- D4 : EXT_1
- D5 : EXT_6
- D6 : EXT_7
- D7 : EXT_8
- D8 : EXT_9
- D9 : EXT_10
- D10 : EXT_12
- D11 : EXT_13
- D12 : EXT_14
- D13 : EXT_11
- D14 : EXT_15
- D15 : EXT_5
- D16 : EXT_16
- D17 : EXT_17
- D18 : EXT_18
- D19 : EXT_19
- D20 : EXT_20
- D21 : EXT_21
- D22 : EXT_22
- D23 : EXT_23
- D24 : EXT_24
- D25 : EXT_25
- D26 : EXT_26
- D27 : EXT_30
- D28 : EXT_28
- D29 : EXT_29
- D30 : EXT_27
- D31 : EXT_32
- D32 : EXT_33
- D33 : EXT_34
- D34 : EXT_35
- D35 : EXT_36
- D36 : EXT_38
- D37 : EXT_39
- D38 : EXT_40
- D39 : EXT_44
- D40 : EXT_41
- D41 : EXT_31
- D42 : EXT_37
- D43 : EXT_42
- D44 : EXT_43
- D45 : EXT_45
- D46 : EXT_46
- D47 : EXT_47
- D48 : EXT_48
- D49 : EXT_49
- D50 : EXT_50
- D51 : EXT_51
Peripheral Mapping:
.. hlist::
:columns: 3
- UART_3_RX : D0
- UART_3_TX : D1
- SPI_3_CS : D10
- SPI_3_MOSI : D11
- SPI_3_MISO : D12
- SPI_3_SCLK : D13
- I2C_3_SDA : D14
- I2C_3_SCL : D15
- UART_4_RX : D26
- UART_4_TX : D30
- SPI_4_CS : D36
- SPI_4_MOSI : D37
- SPI_4_MISO : D38
- SPI_4_SCK : D39
- I2C_4_SDA : D40
- I2C_4_SCL : D41
For mode details please refer to `MPS2 Technical Reference Manual (TRM)`_.
System Clock
============
The V2M MPS2 main clock is 24 MHz.
Serial Port
===========
The V2M MPS2 processor has five UARTs. Both the UARTs have only two wires for
RX/TX and no flow control (CTS/RTS) or FIFO. The Zephyr console output, by
default, is utilizing UART0.
Programming and Debugging
*************************
Flashing
========
V2M MPS2 provides:
- A USB connection to the host computer, which exposes a Mass Storage and an
USB Serial Port.
- A Serial Flash device, which implements the USB flash disk file storage.
- A physical UART connection which is relayed over interface USB Serial port.
Flashing an application to V2M MPS2
-----------------------------------
Here is an example for the :ref:`hello_world` application.
.. zephyr-app-commands::
:zephyr-app: samples/hello_world
:board: mps2_an385
:goals: build
Connect the V2M MPS2 to your host computer using the USB port and you should
see a USB connection which exposes a Mass Storage and a USB Serial Port.
Copy the generated zephyr.bin in the exposed drive.
Reset the board and you should be able to see on the corresponding Serial Port
the following message:
.. code-block:: console
Hello World! arm
.. _V2M MPS2 Website:
https://developer.mbed.org/platforms/ARM-MPS2/
.. _MPS2 Technical Reference Manual (TRM):
http://infocenter.arm.com/help/topic/com.arm.doc.100112_0200_05_en/versatile_express_cortex_m_prototyping_systems_v2m_mps2_and_v2m_mps2plus_technical_reference_100112_0200_05_en.pdf
.. _Application Note AN385:
http://infocenter.arm.com/help/topic/com.arm.doc.dai0385c/DAI0385C_cortex_m3_on_v2m_mps2.pdf
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