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96Boards STM32 Sensor Mezzanine

Overview

96Boards STM32 Sensor Mezzanine is based on the ST Microelectronics STM32F446VE Cortex M4 CPU.

This board acts as a mezzanine platform for all 96Boards CE compliant boards. It can also be used as a standalone board.

96Boards STM32 Sensor Mezzanine

Fig. 58 96Boards STM32 Sensor Mezzanine

Hardware

96Boards STM32 Sensor Mezzanine provides the following hardware components:

  • STM32F446VE in LQFP100 package

  • ARM® 32-bit Cortex®-M4 CPU with FPU

  • 180 MHz max CPU frequency

  • 1.8V work voltage

  • 512 KB Flash

  • 128 KB SRAM

  • On board sensors:

    • Temperature/Pressure: STMicro LPS22HB

    • Accelerometer/Gyroscope: STMicro LSM6DS3H

    • Magnetometer: STMicro LIS3MDL

    • Microphone: STMicro MP34DT01

  • 3User LEDs

  • GPIO with external interrupt capability

  • UART

  • I2C (2)

  • SPI (3)

  • I2S (1)

Supported Features

The Zephyr 96b_stm32_sensor_mez board configuration supports the following hardware features:

Interface

Controller

Driver/Component

NVIC

on-chip

nested vector interrupt controller

SYSTICK

on-chip

system clock

UART

on-chip

serial port

GPIO

on-chip

gpio

PINMUX

on-chip

pinmux

FLASH

on-chip

flash

SPI

on-chip

spi

I2C

on-chip

i2c

PWM

on-chip

pwm

I2S

on-chip

i2s

The default board configuration can be found in the defconfig file:

boards/arm/96b_stm32_sensor_mez/96b_stm32_sensor_mez_defconfig

Connections and IOs

LED

  • LED1 / User1 LED = PD10

  • LED2 / User2 LED = PD11

  • LED3 / User3 LED = PD12

Push buttons

  • BUTTON = RST (BT1)

  • BUTTON = USR (BT2)

System Clock

96Boards STM32 Sensor Mezzanine can be driven by an internal oscillator as well as the main PLL clock. In default board configuration, the 16MHz external oscillator is used to drive the main PLL clock to generate a System Clock (SYSCLK) at 84MHz. On the bus side, AHB/APB2 clocks runs at 84MHz, while APB1 clock runs at 42MHz.

Serial Port

On 96Boards STM32 Sensor Mezzanine, Zephyr console output is assigned to UART4 exposed via on-board Micro USB connector. Default settings are 115200 8N1.

The default USART mappings for the remaining ones are:

  • USART1: Connected to AP via UART0 on the 96Boards Low-Speed Header.

    • TX: PA9

    • RX: PA10

  • USART2: Connected to D0(RX) and D1(TX) on the Arduino Header.

    • TX: PD5

    • RX: PD6

  • USART3: Broken out to Grove connector J10.

    • TX: PD8

    • RX: PD9

I2C

96Boards STM32 Sensor Mezzanine board has up to 3 I2Cs. The default I2C mapping is:

  • I2C1_SCL : PB6

  • I2C1_SDA : PB7

  • I2C2_SCL : PB10

  • I2C2_SDA : PC12

I2C2 goes to the Groove connectors and can be used to attach external sensors.

SPI

96Boards STM32 Sensor Mezzanine board has 3 SPIs. SPI1 is used in slave mode as the communication bus with the AP. SPI2 is used in master mode to control the LSM6DS3H sensor. SPI4 is broken out to Grove Connector J5. The default SPI mapping is:

  • SPI1_NSS : PA4

  • SPI1_SCK : PA5

  • SPI1_MISO : PA6

  • SPI1_MOSI : PA7

  • SPI2_NSS : PB9

  • SPI2_SCK : PD3

  • SPI2_MISO : PB14

  • SPI2_MOSI : PB15

  • SPI4_NSS : PE11

  • SPI4_SCK : PE12

  • SPI4_MISO : PE13

  • SPI4_MOSI : PE14

PWM

96Boards STM32 Sensor Mezzanine board exposes 6 PWM channels on the Arduino connector. The default PWM mapping is:

  • PWM3_CH1 : PB4 : D9

  • PWM3_CH3 : PC8 : D3

  • PWM4_CH3 : PD14 : D6

  • PWM4_CH4 : PD15 : D5

  • PWM9_CH1 : PE5 : D12

  • PWM9_CH2 : PE6 : D11

I2S

96Boards STM32 Sensor Mezzanine board exposes 1 I2S port which is connected to the on-board ST MP34DT01 DMIC. The default I2S mapping is:

  • I2S2_SD : PC1

  • I2S2_CK : PC7

Programming and Debugging

Building

Here is an example for building the Hello World application.

# From the root of the zephyr repository
west build -b 96b_stm32_sensor_mez samples/hello_world

Flashing

96Boards STM32 Sensor Mezzanine board includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in the Zephyr SDK.

Flashing an application to 96Boards STM32 Sensor Mezzanine

Here is an example for the Hello World application.

Run a serial host program to connect with your 96Boards STM32 Sensor Mezzanine board.

$ minicom -b 115200 -D /dev/ttyACM0

Build and flash the application:

# From the root of the zephyr repository
west build -b 96b_stm32_sensor_mez samples/hello_world
west flash

You should see the following message on the console:

$ Hello World! 96b_stm32_sensor_mez

Debugging

You can debug an application in the usual way. Here is an example for the Hello World application.

# From the root of the zephyr repository
west build -b 96b_stm32_sensor_mez samples/hello_world
west debug

References