STG-800 lococube mini-PLC

Board Overview

STG-800 lococube mini-PLC

Name:

stg_800

Vendor:

Barth Elektronik GmbH

Status:

Not actively maintained

Architecture:

arm

SoC:

stm32f091xc

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Overview

The Barth Electronik STG-800 lococube mini-PLC [1] board is based on the STM32F091 microcontroller from ST Microelectronics. It has analog and digital inputs, digital power outputs and a CAN bus interface.

Warning

If you program this board with Zephyr firmware, the original miCon-L firmware will be irreversibly overwritten.

Hardware

• Microcontroller STM32F091CCUx in UFQFPN48 package. Max frequency 48 MHz.

• ARM Cortex M0+ core

• 32 kByte SRAM

• 256 kByte flash

• 8 kByte EEPROM via I2C

• Supply voltage +7 to +32 Volt

• Temperature range -40 to +70 °C

• Vibration Resistant and Rugged Sealing

• Green user LED

• 3 analog inputs 0-30 Volt, 12 bit ADC

• 2 digital inputs

• 4 high-side digital outputs, capable of 1.5 A

• 1 low-side PWM digital output, capable of 2 A

• CAN bus interface

• Debug serial port, 3.3 Volt compatible

• Serial wire debug (SWD) connector

Default Zephyr Peripheral Mapping

Label	Pin
LED	PA8

EEPROM (8 kByte):

Signal	MCU pin	Default pin mux
SDA	PB14	I2C2
SCL	PB13	I2C2

CAN controller:

Signal	MCU pin	Default pin mux
CAN_TX	PB9	CAN1
CAN_RX	PB8	CAN1
CAN_S	PB6	GPIO for CAN transceiver enable

X1 Connector (Supply and CAN bus):

Connector pin	Label	Description
1	+VDD	+7 to +32 Volt, use fuse max 5 A
2	GND
3	CANH
4	CANL

There are no CAN termination resistors on this board.

X2 Connector (Inputs and outputs):

Connector pin	Label	MCU pin	Description	Default pin mux
1	IN1	PA0	Analog in 0-30 Volt	ADC_IN0
2	IN2	PA1	Analog in 0-30 Volt	ADC_IN1
3	IN3	PA2	Analog in 0-30 Volt	ADC_IN2
4	IN4	PA12	Digital in max 30 Volt
5	IN5	PA15	Digital in max 30 Volt
6	OUT1	PC13	Digital out highside
7	OUT2	PC14	Digital out highside
8	OUT3	PC15	Digital out highside
9	OUT4	PA4	Digital out highside
10	OUT5	PB7	Digital out lowside

There are pulldown resistors on all inputs. Do not switch the highside digital outputs (OUT1-OUT4) faster than 100 Hz, due to heat disipation in the drivers.

X3 Connector (Programming):

Connector pin	MCU pin	Signal	ST-Link/V2 pin
1, closest to ISP text		+3.3 Volt	1
2		GND	4
3	PA13	SWDIO	7
4	PA14	SWCLK	9
5		RESET	15

X4 Connector (Debug serial port):

Pin	Comment	MCU pin	Signal	Default pin mux
1	Closest to TTL232 text		GND
2	Connect to host TX	PA10	RX (3.3 Volt)	USART1
3	Connect to host RX	PA9	TX (3.3 Volt)	USART1

Supported Features

The stg_800 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.

stg_800/stm32f091xc target

On-target memory for this board target: 32 KiB of RAM, 256 KiB of Flash.

Type	Location	Description	Compatible
CPU	on-chip	ARM Cortex-M0 CPU1	arm,cortex-m0
ADC	on-chip	STM32 ADC1	st,stm32-adc
CAN	on-chip	STM32 CAN controller1	st,stm32-bxcan
Clock control	on-chip	STM32F0/G0 RCC (Reset and Clock controller)1	st,stm32f0-rcc
	on-chip	STM32 HSE Clock1	st,stm32-hse-clock
	on-chip	Generic fixed-rate clock provider13	fixed-clock
	on-chip	STM32 LSE Clock1	st,stm32-lse-clock
	on-chip	STM32F0/F3 Main PLL1	st,stm32f0-pll-clock
Counter	on-chip	STM32 counters9	st,stm32-counter
CRC	on-chip	STM32 CRC calculation unit1	st,stm32-crc
DAC	on-chip	STM32 family DAC1	st,stm32-dac
DMA	on-chip	STM32 DMA controller (V2bis) for the stm32F0, stm32F1 and stm32L1 soc families11	st,stm32-dma-v2bis
Flash controller	on-chip	STM32 Family flash controller1	st,stm32-flash-controller
GPIO & Headers	on-chip	STM32 GPIO Controller6	st,stm32-gpio
I2C	on-chip	STM32 I2C V2 controller11	st,stm32-i2c-v2
IIO	on-board	Voltage Divider3	voltage-divider
Input	on-chip	STM32 Tocuh Sensing Controller (TSC) driver1	st,stm32-tsc
Interrupt controller	on-chip	ARMv6-M NVIC (Nested Vectored Interrupt Controller) controller1	arm,v6m-nvic
	on-chip	STM32 External Interrupt Controller1	st,stm32-exti
LED	on-board	Group of GPIO-controlled LEDs1	gpio-leds
Memory controller	on-chip	STM32 Battery Backed RAM1	st,stm32-bbram
MTD	on-chip	STM32 flash memory1	st,stm32-nv-flash
	on-board	I2C EEPROMs compatible with Atmel’s AT24 family1	atmel,at24
NVMEM	on-chip	Fixed layout for Non-Volatile memory1	fixed-layout
OTP memory	on-chip	STM32 embedded NVM OTP1	st,stm32-nvm-otp
PHY	on-board	Simple GPIO controlled CAN transceiver1	can-transceiver-gpio
Pin control	on-chip	STM32 Pin controller1	st,stm32-pinctrl
PWM	on-chip	STM32 PWM7	st,stm32-pwm
Reset controller	on-chip	STM32 Reset and Clock Control (RCC) Controller1	st,stm32-rcc-rctl
RTC	on-chip	STM32 RTC1	st,stm32-rtc
Sensors	on-chip	STM32 VREF+1	st,stm32-vref
	on-chip	STM32 family TEMP node for production calibrated sensors with two calibration temperatures1	st,stm32-temp-cal
	on-chip	STM32 VBAT1	st,stm32-vbat
Serial controller	on-chip	STM32 USART17	st,stm32-usart
SMbus	on-chip	STM32 SMBus controller2	st,stm32-smbus
SPI	on-chip	STM32 SPI controller with embedded Rx and Tx FIFOs2	st,stm32-spi-fifo
Timer	on-chip	ARMv6-M System Tick1	arm,armv6m-systick
	on-chip	STM32 timers9	st,stm32-timers
Watchdog	on-chip	STM32 watchdog1	st,stm32-watchdog
	on-chip	STM32 system window watchdog1	st,stm32-window-watchdog

Programming and Debugging

The stg_800 board supports the runners and associated west commands listed below.

	flash	debug	debugserver	attach	rtt	reset
jlink	✅	✅	✅	✅	✅	✅
openocd	✅	✅ (default)	✅	✅	✅
stm32cubeprogrammer	✅ (default)

Connect a ST-Link/V2 programmer to the X3 connector of the board. See the table above for how the pins of the ST-Link/V2 programmer should be connected to pins of the board connector.

In order to be able to program new firmware to the board, the “option bytes” of the microcontroller must be erased to disable read/write protection. This can be done using the STM32CubeProgrammer [2] software.

The board is configured to be flashed using west STM32CubeProgrammer runner, so its installation is required.

Alternatively, OpenOCD or JLink can also be used to flash the board using the --runner (or -r) option:

$ west flash --runner openocd
$ west flash --runner jlink

Flashing

To run the Blinky sample:

# From the root of the zephyr repository
west build -b stg_800 samples/basic/blinky/
west flash

Try also the Hello World, Analog-to-Digital Converter (ADC) with devicetree, EEPROM and Controller Area Network (CAN) counter samples.

Use the shell to read the input pins and control the output pins:

# From the root of the zephyr repository
west build -b stg_800 samples/sensor/sensor_shell -- -DCONFIG_GPIO=y -DCONFIG_GPIO_SHELL=y
west flash

Read analog voltage on IN1 (which is around 12 Volt in this example):

uart:~$ sensor get input1
channel type=42(voltage) index=0 shift=4 num_samples=1 value=87626876000ns (11.984414)

Read digital signal on IN4 (pin A12):

uart:~$ gpio conf gpioa 12 ih
uart:~$ gpio get gpioa 12
1

Set digital OUT1 (pin C13) to high:

uart:~$ gpio conf gpioc 13 oh0
uart:~$ gpio set gpioc 13 1

References

[1]

https://barth-elektronik.com/en/lococube-mini-PLC-STG-800/0850-0800

[2]

https://www.st.com/en/development-tools/stm32cubeprog.html