.. _mec17sxevb_assy6906:

MEC172xEVB ASSY6906
###################

Overview
********

The MEC172xEVB_ASSY6906 kit is a future development platform to evaluate the
Microchip MEC172X series microcontrollers. This board needs to be mated with
part number MEC1723 176WFBA SOLDER DC ASSY 6915(cpu board) in order to operate.
MEC172x and MEC152x SPI image formats are not compatible with each other.

Hardware
********

- MEC1723NB0SZ ARM Cortex-M4 Processor
- 416 KB RAM and 128 KB boot ROM
- Keyboard interface
- ADC & GPIO headers
- UART0 and UART1
- FAN0, FAN1, FAN2 headers
- FAN PWM interface
- JTAG/SWD, ETM and MCHP Trace ports
- PECI interface 3.0
- I2C voltage translator
- 10 SMBUS headers
- 4 SGPIO headers
- VCI interface
- 2 independent Hardware Driven PS/2 Ports
- eSPI header
- 3 Breathing/Blinking LEDs
- 2 Sockets for SPI NOR chips
- One reset and VCC_PWRDGD pushbuttons
- One external PCA9555 I/O port with jumper selectable I2C address.
- One external LTC2489 delta-sigma ADC with jumper selectable I2C address.
- Board power jumper selectable from +5V 2.1mm/5.5mm barrel connector or USB Micro A connector.

For more information about the SOC's please see `MEC172x Reference Manual`_

Supported Features
==================

The mec172xevb_assy6906 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                         |
+-----------+------------+-------------------------------------+
| GPIO      | on-chip    | gpio                                |
+-----------+------------+-------------------------------------+
| I2C       | on-chip    | i2c                                 |
+-----------+------------+-------------------------------------+
| PINMUX    | on-chip    | pinmux                              |
+-----------+------------+-------------------------------------+
| PS/2      | on-chip    | ps2                                 |
+-----------+------------+-------------------------------------+
| KSCAN     | on-chip    | kscan                               |
+-----------+------------+-------------------------------------+
| TACH      | on-chip    | tachometer                          |
+-----------+------------+-------------------------------------+
| RPMFAN    | on-chip    | Fan speed controller                |
+-----------+------------+-------------------------------------+


Other hardware features are not currently supported by Zephyr (at the moment)

The default configuration can be found in the
:zephyr_file:`boards/arm/mec172xevb_assy6906/mec172xevb_assy6906_defconfig` Kconfig file.

Connections and IOs
===================

This evaluation board kit is comprised of the following HW blocks:

- MEC172x EVB ASSY 6906 Rev A `MEC172x EVB Schematic`_
- MEC1723 176WFBA SOLDER DC ASSY 6915 with MEC172x silicon `MEC172x Daughter Card Schematic`_
- SPI DONGLE ASSY 6791 `SPI Dongle Schematic`_

System Clock
============

The MEC1723 MCU is configured to use the 96Mhz internal oscillator with the
on-chip PLL to generate a resulting EC clock rate of 12 MHz. See Processor clock
control register in chapter 4 "4.0 POWER, CLOCKS, and RESETS" of the data sheet in
the references at the end of this document.

Serial Port
===========

UART1 is configured for serial logs.

Jumper settings
***************

Please follow the jumper settings below to properly demo this
board. Advanced users may deviate from this recommendation.

Jumper setting for MEC172x EVB Assy 6906 Rev A1p0
=================================================

Power-related jumpers
---------------------

If you wish to power from +5V power brick, then connect to barrel connector ``P11``
(5.5mm OD, 2.1mm ID) and move the jumper to ``JP88 5-6``.

If you wish to power from micro-USB type A/B connector ``P12``, move the
jumper to ``JP88 7-8``.


.. note:: A single jumper is required in JP88.

+-------+------+------+------+------+------+------+------+------+------+------+
| JP22  | JP32 | JP33 | JP37 | JP43 | JP47 | JP54 | JP56 | JP58 | JP64 | JP65 |
+=======+======+======+======+======+======+======+======+======+======+======+
| 1-2   | 1-2  | 1-2  | 1-2  |  1-2 | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  |
+-------+------+------+------+------+------+------+------+------+------+------+

+------+------+------+------+------+------+------+------+------+------+
| JP72 | JP73 | JP76 | JP79 | JP80 | JP81 | JP82 | JP84 | JP87 | JP89 |
+======+======+======+======+======+======+======+======+======+======+
| 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  | 1-2  |
+------+------+------+------+------+------+------+------+------+------+

+------+------+-------+-------+-------+
| JP90 | JP91 | JP100 | JP101 | JP118 |
+======+======+=======+=======+=======+
| 1-2  | 1-2  | 1-2   | 1-2   | 2-3   |
+------+------+-------+-------+-------+

These jumpers configure VCC Power good, nRESETI and JTAG_STRAP respectively.

+------------------+-----------+--------------+
| JP5              | JP4       | JP45         |
| (VCC Power good) | (nRESETI) | (JTAG_STRAP) |
+==================+===========+==============+
| 1-2              | 1-2       | 2-3          |
+------------------+-----------+--------------+

Boot-ROM Straps.
----------------

These jumpers configure MEC1501 Boot-ROM straps.

+-------------+------------+--------------+-------------+
| JP93        | JP11       | JP46         | JP96        |
| (CMP_STRAP) | (CR_STRAP) | (VTR2_STRAP) | (BSS_STRAP) |
+=============+============+==============+=============+
| 2-3         | 1-2        | 2-3          | 1-2         |
+-------------+------------+--------------+-------------+

``JP96 1-2`` pulls SHD SPI CS0# up to VTR2. MEC172x Boot-ROM samples
SHD SPI CS0# and if high, it loads code from SHD SPI.

Peripheral Routing Jumpers
--------------------------

Each column of the following table illustrates how to enable UART1, SWD,
PVT SPI, SHD SPI and LED0-2 respectively.

+----------+----------+--------+-----------+----------+---------+
|  JP48    |  JP9     | JP9    | JP38      | JP98     | JP41    |
|  (UART1) |  (UART1) | (SWD)  | (PVT SPI) | (SHD SPI)| (LED0-2)|
+==========+==========+========+===========+==========+=========+
|  1-2     |          | 2-3    | 2-3       | 2-3      | 1-2     |
+----------+----------+--------+-----------+----------+---------+
|  4-5     |  4-5     |        | 5-6       | 5-6      | 3-4     |
+----------+----------+--------+-----------+----------+---------+
|  7-8     |          | 8-9    | 8-9       | 8-9      | 5-6     |
+----------+----------+--------+-----------+----------+---------+
|  10-11   |  10-11   |        | 11-12     | 11-12    |         |
+----------+----------+--------+-----------+----------+---------+
|          |          |        | 14-15     | 14-15    |         |
+----------+----------+--------+-----------+----------+---------+
|          |          |        | 17-18     | 20-21    |         |
+----------+----------+--------+-----------+----------+---------+

.. note:: For UART1 make sure JP39 have jumpers connected 1-2, 3-4.

To receive UART1 serial output, please refer to the picture below
to make sure that JP9 configured for UART1 output.

Jumper settings for MEC172x 176WFBGA Socket DC Assy 6915 Rev B1p0
=================================================================

The jumper configuration explained above covers the base board. The ASSY
6915 MEC1723 CPU board provides capability for an optional, external 32KHz
clock source. The card includes a 32KHz crystal oscillator. The card can
also be configured to use an external 50% duty cycle 32KHz source on the
XTAL2/32KHZ_IN pin. Note, firmware must set the MEC172x clock enable
register to select the external source matching the jumper settings. If
using the MEC15xx internal silicon oscillator then the 32K jumper settings
are don't cares. ``JP1`` is for scoping test clock outputs. Please refer to
the schematic in reference section below.

Parallel 32KHz crystal configuration
------------------------------------
+-------+-------+
| JP2   | JP3   |
+=======+=======+
| 1-2   | 2-3   |
+-------+-------+

External 32KHz 50% duty cycle configuration
-------------------------------------------
+-------+-------+
| JP2   | JP3   |
+=======+=======+
| NC    | 1-2   |
+-------+-------+


Jumper settings for MEC1723 176WFBGA Socket DC Assy 6915 Rev B1p0
=================================================================

The MEC1723 ASSY 6915 CPU card does not include an onboard external
32K crystal or oscillator. The one jumper block ``JP1`` is for scoping
test clock outputs not for configuration. Please refer to schematic
in reference section below.

Programming and Debugging
*************************

Setup
=====
#. If you use Dediprog SF100 programmer, then setup it.

   Windows version can be found at the `SF100 Product page`_.

   Linux version source code can be found at `SF100 Linux GitHub`_.
   Follow the `SF100 Linux manual`_ to complete setup of the SF100 programmer.
   For Linux please make sure that you copied ``60-dediprog.rules``
   from the ``SF100Linux`` folder to the :code:`/etc/udev/rules.s` (or rules.d)
   then restart service using:

   .. code-block:: console

      $ udevadm control --reload

   Add directory with program ``dpcmd`` (on Linux)
   or ``dpcmd.exe`` (on Windows) to your ``PATH``.

#. Clone the `MEC172x SPI Image Gen`_ repository or download the files within
   that directory.

#. Make the image generation available for Zephyr, by making the tool
   searchable by path, or by setting an environment variable
   ``MEC172X_SPI_GEN``, for example:

   .. code-block:: console

      export MEC172X_SPI_GEN=<path to tool>/mec172x_spi_gen_lin_x86_64

   Note that the tools for Linux and Windows have different file names.

#. If needed, a custom SPI image configuration file can be specified
   to override the default one.

   .. code-block:: console

      export MEC172X_SPI_CFG=custom_spi_cfg.txt

Wiring
========
#. Connect the SPI Dongle ASSY 6791 to ``J34`` in the EVB.

#. Connect programmer to the header J6 on the Assy6791 board, it will flash the SPI NOR chip ``U3``
   Make sure that your programmer's offset is 0x0.
   For programming you can use Dediprog SF100 or a similar tool for flashing SPI chips.


   .. note:: Remember that SPI MISO/MOSI are swapped on Dediprog headers!
    Use separate wires to connect Dediprog pins with pins on the Assy6791 SPI board.
    Wiring connection is described in the table below.

    +------------+---------------+
    |  Dediprog  |  Assy6791     |
    |  Connector |  J6 Connector |
    +============+===============+
    |    VCC     |       1       |
    +------------+---------------+
    |    GND     |       2       |
    +------------+---------------+
    |    CS      |       3       |
    +------------+---------------+
    |    CLK     |       4       |
    +------------+---------------+
    |    MISO    |       6       |
    +------------+---------------+
    |    MOSI    |       5       |
    +------------+---------------+

#. Connect UART1 port of the MEC17xxEVB_ASSY_6906 board
   to your host computer using the RS232 cable.

#. Apply power to the board via a micro-USB cable.
   Configure this option by using a jumper between ``JP88 7-8``.

#. Final wiring for the board should look like this:

Building
========
#. Build :ref:`hello_world` application as you would normally do.

#. The file :file:`spi_image.bin` will be created if the build system
   can find the image generation tool. This binary image can be used
   to flash the SPI chip.

Flashing
========
#. Run your favorite terminal program to listen for output.
   Under Linux the terminal should be :code:`/dev/ttyUSB0`. Do not close it.

   For example:

   .. code-block:: console

      $ minicom -D /dev/ttyUSB0 -o

   The -o option tells minicom not to send the modem initialization
   string. Connection should be configured as follows:

   - Speed: 115200
   - Data: 8 bits
   - Parity: None
   - Stop bits: 1

#. Flash your board using ``west`` from the second terminal window.
   Split first and second terminal windows to view both of them.

   .. code-block:: console

      $ west flash

   .. note:: When west process started press Reset button and do not release it
    till the whole west process will not be finished successfully.


   .. note:: If you dont't want to press Reset button every time, you can disconnect
    SPI Dongle ASSY 6791 from the EVB during the west flash programming.
    Then connect it back to the ``J34`` header and apply power to the EVB.
    Result will be the same.


#. You should see ``"Hello World! mec172xevb_assy6906"`` in the first terminal window.
   If you don't see this message, press the Reset button and the message should appear.

Debugging
=========
This board comes with a Cortex ETM port which facilitates tracing and debugging
using a single physical connection.  In addition, it comes with sockets for
JTAG only sessions.

Troubleshooting
===============
#. In case you don't see your application running, please make sure ``LED7``, ``LED8``, and ``LED1``
   are lit. If one of these is off, then check the power-related jumpers again.

#. If you can't program the board using Dediprog, disconnect the Assy6791
   from the main board Assy6853 and try again.

#. If Dediprog can't detect the onboard flash, press the board's Reset button and try again.

References
**********
.. target-notes::

.. _MEC172x Reference Manual:
    https://github.com/MicrochipTech/CPGZephyrDocs/blob/master/MEC172x/MEC172x-Data-Sheet.pdf
.. _MEC172x EVB Schematic:
    https://github.com/MicrochipTech/CPGZephyrDocs/blob/master/MEC172x/MEC172X-EVB-Assy_6906-A1p0-SCH.pdf
.. _MEC172x Daughter Card Schematic:
    https://github.com/MicrochipTech/CPGZephyrDocs/blob/master/MEC172x/MEC172X-176WFBGA-Socket-DC-Assy6915-Rev-B-SCH.pdf
.. _SPI Dongle Schematic:
    https://github.com/MicrochipTech/CPGZephyrDocs/blob/master/MEC1501/SPI%20Dongles%20and%20Aardvark%20Interposer%20Assy%206791%20Rev%20A1p1%20-%20SCH.pdf
.. _MEC172x SPI Image Gen:
    https://github.com/MicrochipTech/CPGZephyrDocs/tree/master/MEC172x/SPI_image_gen
.. _SF100 Linux GitHub:
    https://github.com/DediProgSW/SF100Linux
.. _SF100 Product page:
    https://www.dediprog.com/product/SF100
.. _SF100 Linux manual:
    https://www.dediprog.com/download/save/727.pdf