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MEC15xxEVB ASSY6853

Overview

The MEC15xxEVB_ASSY6853 kit is a future development platform to evaluate the Microchip MEC15XX series microcontrollers. This board needs to be mated with part number MEC1501 144WFBA SOLDER DC ASSY 6860(cpu board) in order to operate. The MEC152x has superseded the MEC1501 in production. MEC152x is identical to MEC150x except for an enhanced Boot-ROM SPI loader. The SPI image format has been updated requiring a new SPI image tool. MEC1501 and MEC152x SPI image formats are not compatible with each other. Evaluation and cpu boards are compatible.

Hardware

  • MEC1521HA0SZ ARM Cortex-M4 Processor

  • 256 KB RAM and 64 KB boot ROM

  • Keyboard interface

  • ADC & GPIO headers

  • UART0, UART1, and UART2

  • 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

  • 5 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 MEC152x Reference Manual [1]

Supported Features

The mec15xxevb_assy6853 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

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

The default configuration can be found in the boards/microchip/mec15xxevb_assy6853/mec15xxevb_assy6853_defconfig Kconfig file.

Connections and IOs

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

System Clock

The MEC1521 MCU is configured to use the 48Mhz 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

UART2 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 MEC15xx EVB Assy 6853 Rev A1p0

Boot-ROM Straps.

These jumpers configure MEC1501 Boot-ROM straps.

JP93 (CMP_STRAP)

JP11 (CR_STRAP)

JP46 (VTR2_STRAP)

JP96 (BSS_STRAP)

2-3

1-2

2-3

1-2

JP96 1-2 pulls SHD SPI CS0# up to VTR2. MEC1501 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 UART2, SWD, PVT SPI, SHD SPI and LED0-2 respectively.

JP48 (UART2)

JP9 (UART2)

JP9 (SWD)

JP38 (PVT SPI)

JP98 (SHD SPI)

JP41 (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 UART2 make sure JP39 have jumpers connected 1-2, 3-4.

To receive UART2 serial output, please refer to the picture below to make sure that JP9 configured for UART2 output.

JP9 header Assy6853

Jumper settings for MEC1501 144WFBGA Socket DC Assy 6883 Rev B1p0

The jumper configuration explained above covers the base board. The ASSY 6883 MEC1501 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 MEC15xx 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 MEC1503 144WFBGA Socket DC Assy 6856 Rev B1p0

The MEC1503 ASSY 6856 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

  1. If you use Dediprog SF100 programmer, then setup it.

    Windows version can be found at the SF100 Product page [8].

    Linux version source code can be found at SF100 Linux GitHub [7]. Follow the SF100 Linux manual [9] to complete setup of the SF100 programmer. For Linux please make sure that you copied 60-dediprog.rules from the SF100Linux folder to the /etc/udev/rules.s (or rules.d) then restart service using:

    $ udevadm control --reload

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

  2. Clone the MEC152x SPI Image Gen [5] repository or download the files within that directory. For the pre-production MEC150x use MEC150x SPI Image Gen [6] repository.

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

    export EVERGLADES_SPI_GEN=<path to tool>/everglades_spi_gen_RomE

    Note that the tools for Linux and Windows have different file names. For the pre-production MEC1501 SOC use everglades_spi_gen_lin64.

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

    export EVERGLADES_SPI_CFG=custom_spi_cfg.txt

Wiring

  1. Connect the SPI Dongle ASSY 6791 to J44 in the EVB.

    SPI DONGLE ASSY 6791 Connected

  2. 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.

    Microchip board wiring
    SPI DONGLE ASSY 6791 SPI DONGLE ASSY 6791 view 2

    SPI DONGLE ASSY 6791 Connected

    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 Connector

    Assy6791 J6 Connector

    VCC

    1

    GND

    2

    CS

    3

    CLK

    4

    MISO

    6

    MOSI

    5

  3. Connect UART2 port of the MEC15xxEVB_ASSY_6853 board to your host computer using the RS232 cable.

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

    SPI DONGLE ASSY 6791 Connected

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

    SPI DONGLE ASSY 6791 Connected

Building

  1. Build Hello World application as you would normally do.

  2. The 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

  1. Run your favorite terminal program to listen for output. Under Linux the terminal should be /dev/ttyUSB0. Do not close it.

    For example:

    $ 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

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

    $ 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.

    SPI DONGLE ASSY 6791 Connected

    Note

    If you don’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 J44 header and apply power to the EVB. Result will be the same.

  3. You should see "Hello World! mec15xxevb_assy6853" 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

  1. 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.

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

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

Notes

  1. To enable PCA9555PW and test the I2C on mec15xxevb_assy6853, additional works are needed:

    As the I2C slave device NXP pca95xx on mec15xxevb_assy6853 is connected to I2C00 port, however, I2C00 port is shared with UART2 RS232 to TTL converter used to catch serial log, so it’s not possible to use UART2 and I2C00 port simultaneously. We need to change to use I2C01 port by making some jumpers setting as below:

  • JP99 1-2 Connected Connect I2C01_SDA from CPU to header J5

  • JP99 13-14 Connected Connect I2C01_SCL from CPU to header J5

  • JP25 21-22 Connected External pull-up for I2C01_SDA

  • JP25 23-24 Connected External pull-up for I2C01_SCL

  • JP44.1 J5.1 Connected Connect NXP PCA95xx to I2C01

  • JP44.3 J5.3 Connected Connect NXP PCA95xx to I2C01

References