Arduino OPTA
Overview
The Arduino™ Opta® is a secure micro Programmable Logic Controller (PLC) with Industrial Internet of Things (IoT) capabilities.
Developed in partnership with Finder®, this device supports both the Arduino programming language and standard IEC-61131-3 PLC programming languages, such as Ladder Diagram (LD), Sequential Function Chart (SFC), Function Block Diagram (FBD), Structured Text (ST), and Instruction List (IL), making it an ideal device for automation engineers.
For Zephyr RTOS, both cores are supported. It is also possible to run only on the M4 making the M7 run the PLC tasks while the M4 core under Zephyr acts as a coprocessor.
Additionally, the device features:
Ethernet compliant with IEEE802.3-2002
16MB QSPI Flash
4 x green color status LEDs
1 x green or red led over the reset push-button
1 x blue led over the user push-button (Opta Advanced only)
1 x user push-button
1 x reset push-button accessible via pinhole
8 x analog inputs
4 x isolated relay outputs
More information about the board can be found at the ARDUINO-OPTA website. More information about STM32H747XIH6 can be found here:
Supported Features
The arduino_opta board supports the hardware features listed below.
- on-chip / on-board
- Feature integrated in the SoC / present on the board.
- 2 / 2
-
Number of instances that are enabled / disabled.
Click on the label to see the first instance of this feature in the board/SoC DTS files. -
vnd,foo -
Compatible string for the Devicetree binding matching the feature.
Click on the link to view the binding documentation.
arduino_opta/stm32h747xx/m4 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M4F CPU1 |
|
ADC |
on-chip |
STM32 ADC4 |
|
CAN |
on-chip |
STM32H7 series FDCAN CAN FD controller2 |
|
Clock control |
on-chip |
STM32H7 RCC (Reset and Clock controller)1 |
|
on-chip |
STM32 HSE Clock1 |
||
on-chip |
STM32 HSI Clock1 |
||
on-chip |
Generic fixed-rate clock provider3 |
||
on-chip |
STM32 LSE Clock1 |
||
on-chip |
STM32H7 main PLL3 |
||
on-chip |
STM32 Clock multiplexer1 |
||
on-chip |
STM32 Microcontroller Clock Output (MCO)2 |
||
Counter |
on-chip |
STM32 counters12 |
|
DAC |
on-chip |
STM32 family DAC1 |
|
Display |
on-chip |
STM32 LCD-TFT display controller1 |
|
DMA |
on-chip |
STM32 DMA controller (V1)2 |
|
on-chip |
STM32 BDMA controller1 |
||
on-chip |
STM32 DMAMUX controller2 |
||
Ethernet |
on-chip |
STM32H7 Ethernet1 |
|
Flash controller |
on-chip |
STM32 Family flash controller1 |
|
GPIO & Headers |
on-chip |
STM32 GPIO Controller11 |
|
I2C |
on-chip |
STM32 I2C V2 controller4 |
|
I2S |
on-chip |
STM32H7 I2S controller3 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
on-chip |
STM32 External Interrupt Controller1 |
||
IPM |
on-chip |
STM32 HSEM MAILBOX1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
MDIO |
on-chip |
STM32 MDIO Controller1 |
|
Memory controller |
on-chip |
STM32 Battery Backed RAM1 |
|
on-chip |
STM32H7 Flexible Memory Controller (FMC)1 |
||
on-chip |
STM32 Flexible Memory Controller (SDRAM controller)1 |
||
MIPI-DSI |
on-chip |
STM32 MIPI DSI host1 |
|
Miscellaneous |
on-board |
Group of relays (like in the original Opta) or other kinds of power switches controlled by a GPIO1 |
|
MMC |
on-chip |
STM32 SDMMC Disk Access2 |
|
MTD |
on-chip |
STM32 flash memory1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
PHY |
on-chip |
This binding is to be used by all the usb transceivers which are built-in with USB IP1 |
|
Pin control |
on-chip |
STM32 Pin controller1 |
|
PWM |
on-chip |
STM32 PWM12 |
|
QSPI |
on-chip |
STM32 QSPI Controller1 |
|
Reset controller |
on-chip |
STM32 Reset and Clock Control (RCC) Controller1 |
|
RNG |
on-chip |
STM32 Random Number Generator1 |
|
RTC |
on-chip |
STM32 RTC1 |
|
Sensors |
on-chip |
STM32 family TEMP node for production calibrated sensors with two calibration temperatures1 |
|
on-chip |
STM32 VBAT1 |
||
on-chip |
STM32 VREF+1 |
||
Serial controller |
on-chip |
STM32 USART4 |
|
on-chip |
STM32 UART4 |
||
on-chip |
STM32 LPUART1 |
||
SMbus |
on-chip |
STM32 SMBus controller4 |
|
SPI |
on-chip |
STM32H7 SPI controller6 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
on-chip |
STM32 timers14 |
||
on-chip |
STM32 low-power timer (LPTIM)1 |
||
USB |
on-chip |
STM32 OTGHS controller1 |
|
on-chip |
STM32 OTGFS controller1 |
||
Video |
on-chip |
STM32 Digital Camera Memory Interface (DCMI)1 |
|
Watchdog |
on-chip |
STM32 watchdog1 |
|
on-chip |
STM32 system window watchdog1 |
arduino_opta/stm32h747xx/m7 target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M7 CPU1 |
|
ADC |
on-chip |
STM32 ADC4 |
|
CAN |
on-chip |
STM32H7 series FDCAN CAN FD controller2 |
|
Clock control |
on-chip |
STM32H7 RCC (Reset and Clock controller)1 |
|
on-chip |
STM32 HSE Clock1 |
||
on-chip |
STM32 HSI Clock1 |
||
on-chip |
|||
on-chip |
STM32 LSE Clock1 |
||
on-chip |
|||
on-chip |
STM32 Clock multiplexer1 |
||
on-chip |
STM32 Microcontroller Clock Output (MCO)2 |
||
Counter |
on-chip |
STM32 counters12 |
|
DAC |
on-chip |
STM32 family DAC1 |
|
Display |
on-chip |
STM32 LCD-TFT display controller1 |
|
DMA |
on-chip |
STM32 DMA controller (V1)2 |
|
on-chip |
STM32 BDMA controller1 |
||
on-chip |
STM32 DMAMUX controller2 |
||
Ethernet |
on-chip |
STM32H7 Ethernet1 |
|
on-board |
Generic MII PHY1 |
||
Flash controller |
on-chip |
STM32 Family flash controller1 |
|
GPIO & Headers |
on-chip |
STM32 GPIO Controller11 |
|
I2C |
on-chip |
STM32 I2C V2 controller4 |
|
I2S |
on-chip |
STM32H7 I2S controller3 |
|
Input |
on-board |
Group of GPIO-bound input keys1 |
|
Interrupt controller |
on-chip |
ARMv7-M NVIC (Nested Vectored Interrupt Controller)1 |
|
on-chip |
STM32 External Interrupt Controller1 |
||
IPM |
on-chip |
STM32 HSEM MAILBOX1 |
|
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
MDIO |
on-chip |
STM32 MDIO Controller1 |
|
Memory controller |
on-chip |
STM32 Battery Backed RAM1 |
|
on-chip |
STM32H7 Flexible Memory Controller (FMC)1 |
||
on-chip |
STM32 Flexible Memory Controller (SDRAM controller)1 |
||
MIPI-DSI |
on-chip |
STM32 MIPI DSI host1 |
|
Miscellaneous |
on-board |
Group of relays (like in the original Opta) or other kinds of power switches controlled by a GPIO1 |
|
MMC |
on-chip |
STM32 SDMMC Disk Access2 |
|
MMU / MPU |
on-chip |
ARMv7-M Memory Protection Unit (MPU)1 |
|
MTD |
on-chip |
STM32 flash memory1 |
|
on-board |
Fixed partitions of a flash (or other non-volatile storage) memory1 |
||
PHY |
on-chip |
This binding is to be used by all the usb transceivers which are built-in with USB IP1 |
|
Pin control |
on-chip |
STM32 Pin controller1 |
|
PWM |
on-chip |
STM32 PWM12 |
|
QSPI |
on-chip |
STM32 QSPI Controller1 |
|
Reset controller |
on-chip |
STM32 Reset and Clock Control (RCC) Controller1 |
|
RNG |
on-chip |
STM32 Random Number Generator1 |
|
RTC |
on-chip |
STM32 RTC1 |
|
Sensors |
on-chip |
STM32 family TEMP node for production calibrated sensors with two calibration temperatures1 |
|
on-chip |
STM32 VBAT1 |
||
on-chip |
STM32 VREF+1 |
||
Serial controller |
on-chip |
STM32 USART4 |
|
on-chip |
STM32 UART4 |
||
on-chip |
STM32 LPUART1 |
||
SMbus |
on-chip |
STM32 SMBus controller4 |
|
SPI |
on-chip |
STM32H7 SPI controller6 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
on-chip |
STM32 timers14 |
||
on-chip |
STM32 low-power timer (LPTIM)1 |
||
USB |
on-chip |
STM32 OTGHS controller1 |
|
on-chip |
STM32 OTGFS controller1 |
||
Video |
on-chip |
STM32 Digital Camera Memory Interface (DCMI)1 |
|
Watchdog |
on-chip |
STM32 watchdog1 |
|
on-chip |
STM32 system window watchdog1 |
Pin Mapping
Both the M7 and M4 cores have access to the 9 GPIO controllers. These controllers are responsible for pin muxing, input/output, pull-up, etc.
For more details please refer to ARDUINO-OPTA website.
Default Zephyr Peripheral Mapping
Status LED1: PI0
Status LED2: PI1
Status LED3: PI3
Status LED4: PH15
Green “reset” LED: PH12
Red “reset” LED: PH11
Blue LED: PE5
User button: PE4
Input 1 : PA0
Input 2 : PC2
Input 3 : PF12
Input 4 : PB0
Input 5 : PF10
Input 6 : PF8
Input 7 : PF6
Input 8 : PF4
Relay 1: PI6
Relay 2: PI5
Relay 3: PI7
Relay 4: PI4
System Clock
The STM32H747I System Clock can be driven by an internal or external oscillator, as well as by the main PLL clock. By default, the CPU2 (Cortex-M4) System clock is driven at 240MHz. PLL clock is fed by a 25MHz high speed external clock. The M7 clock is driven at 400MHz.
Resources sharing
The dual core nature of STM32H747 SoC requires sharing HW resources between the two cores. This is done in 3 ways:
Compilation: Clock configuration is only accessible to M7 core. M4 core only has access to bus clock activation and deactivation.
Static pre-compilation assignment: Peripherals such as a UART are assigned in devicetree before compilation. The user must ensure peripherals are not assigned to both cores at the same time.
Run time protection: Interrupt-controller and GPIO configurations could be accessed by both cores at run time. Accesses are protected by a hardware semaphore to avoid potential concurrent access issues.
Programming and Debugging
Applications for the arduino_opta use the regular Zephyr build commands.
See Building an Application for more information about application builds.
Flashing
Flashing operation will depend on the target to be flashed and the SoC option bytes configuration. The OPTA has a DFU capable bootloader which can be accessed by connecting the device to the USB, and then pressing the RESET button shortly twice, the RESET-LED on the board will fade indicating the board is in bootloader mode.
By default:
CPU1 (Cortex-M7) boot address is set to 0x08040000
CPU2 (Cortex-M4) boot address is set to 0x08180000
Zephyr flash configuration has been set to be compatible with the “Flash split: 1.5MB M7 + 0.5MB M4” option in the Arduino IDE. The flash is partitioned as follows:
0x08000000-0x0803FFFF (256k) Arduino MCUboot-derived bootloader
0x08040000-0x080FFFFF (768k) M7 application
0x08180000-0x081FFFFF (512k) M4 application
Flashing an application to ARDUINO OPTA M7
First, connect the device to your host computer using the USB port to prepare it for flashing. Then build and flash your application.
Here is an example for the Blinky application on M7 core.
# From the root of the zephyr repository
west build -b arduino_opta/stm32h747xx/m7 samples/basic/blinky
west flash
Flashing an application to ARDUINO OPTA M4
First, connect the device to your host computer using the USB port to prepare it for flashing. Then build and flash your application.
Here is an example for the Blinky application on M4 core.
# From the root of the zephyr repository
west build -b arduino_opta/stm32h747xx/m4 samples/basic/blinky
west flash
Starting the application on the ARDUINO OPTA M4
If you also flashed an application to M7 the M4 processor is started at boot. If not you will need to start the processor from an Arduino sketch.
Make sure the option bytes are set to prevent the M4 from auto-starting, and that the M7 side starts the M4 at the correct Flash address.
This can be done by selecting in the Arduino IDE’s “Tools” / “Flash Split” menu the “1.5MB M7 + 0.5MB M4” option, and loading a sketch that contains at least the following code:
#include <RPC.h> void setup() { RPC.begin(); } void loop() { }
Debugging
The debug port does not have an easy access but it is possible to open the case and solder a standard 10-pin SWD connector to the board. After that both flashing and debugging are available via ST-LINK (M7 core only).