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How to Use 32L4R9IDISCOVERY Board bottom view: Examples, Pinouts, and Specs

Image of 32L4R9IDISCOVERY Board bottom view
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Introduction

The 32L4R9IDISCOVERY board, manufactured by STMicroelectronics, is a development platform built around the STM32L4R9 microcontroller. This microcontroller is optimized for low-power applications, making the board ideal for energy-efficient embedded systems. The bottom view of the board reveals critical components, connectors, and power management features, which are essential for prototyping, debugging, and testing.

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Explore Projects Built with 32L4R9IDISCOVERY Board bottom view

Use Cirkit Designer to design, explore, and prototype these projects online. Some projects support real-time simulation. Click "Open Project" to start designing instantly!
Image of GIZMO Teaset: A project utilizing 32L4R9IDISCOVERY Board bottom view in a practical application
Interactive Touch and Motion Sensor System with Bela Board and OLED Display
This circuit integrates a Bela Board with various sensors and actuators, including a TRILL CRAFT touch sensor, an ADXXL335 accelerometer, a vibration motor, and a loudspeaker. The Bela Board processes input from the touch sensor and accelerometer, and controls the vibration motor and loudspeaker, while an OLED display provides visual feedback.
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Krul': A project utilizing 32L4R9IDISCOVERY Board bottom view in a practical application
Battery-Powered FPV Drone with Telemetry and Dual Motor Control
This circuit appears to be a power distribution and control system for a vehicle with two motorized wheels, possibly a drone or a robot. It includes a lipo battery connected to a Power Distribution Board (PDB) that distributes power to two Electronic Speed Controllers (ESCs) which in turn control the speed and direction of the motors. The system also integrates a flight controller (H743-SLIM V3) for managing various peripherals including GPS, FPV camera system, and a telemetry link (ExpressLRS).
Cirkit Designer LogoOpen Project in Cirkit Designer
Image of Paower: A project utilizing 32L4R9IDISCOVERY Board bottom view in a practical application
Lilygo 7670e-Based Smart Interface with LCD Display and Keypad
This circuit features a Lilygo 7670e microcontroller interfaced with a 16x2 I2C LCD for display, a 4X4 membrane matrix keypad for input, and an arcade button for additional control. It also includes a 4G antenna and a GPS antenna for communication and location tracking capabilities.
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This circuit features a MakerEdu Creator microcontroller board interfaced with two MKE-S11 IR Infrared Obstacle Avoidance Sensors, a MKE-M02 Push Button Tact Switch, a MKE-M15 Bluetooth module, and a MKE-M08 LCD2004 I2C display module. The push button is connected to a digital input for user interaction, while the IR sensors are likely used for detecting obstacles. The Bluetooth module enables wireless communication, and the LCD display provides a user interface for displaying information or statuses.
Cirkit Designer LogoOpen Project in Cirkit Designer

Common Applications and Use Cases

  • Wearable devices and IoT applications
  • Low-power data logging and sensing
  • Prototyping for energy-efficient embedded systems
  • Educational and research purposes in microcontroller programming
  • Development of graphical user interfaces (GUIs) using the integrated display

Technical Specifications

Key Technical Details

  • Microcontroller: STM32L4R9ZI (ARM Cortex-M4, 120 MHz, 2 MB Flash, 640 KB SRAM)
  • Operating Voltage: 3.3V (regulated from USB or external power supply)
  • Power Supply Options: USB, external 5V, or Li-Po battery
  • Connectivity: USB Type-C, ST-LINK/V2-1 debugger/programmer
  • Peripherals:
    • 240x240 pixel TFT-LCD with capacitive touch
    • MicroSD card slot
    • Audio codec with microphone and headphone jack
  • Dimensions: 95 mm x 65 mm

Pin Configuration and Descriptions

The bottom view of the 32L4R9IDISCOVERY board exposes several key connectors and pins. Below is a table summarizing the pin configuration:

Pin/Connector Description
CN7 Arduino Uno V3-compatible headers for GPIO, ADC, PWM, and communication lines.
CN8 Additional GPIO headers for extended functionality.
CN10 STMod+ connector for external modules (e.g., sensors, RF modules).
CN12 MicroSD card slot for data storage and logging.
CN13 USB Type-C connector for power and data communication.
CN14 Li-Po battery connector for portable applications.
JP1 Jumper for selecting power source (USB, external, or battery).
JP2 Jumper for enabling/disabling ST-LINK debugger.

Usage Instructions

How to Use the Component in a Circuit

  1. Powering the Board:

    • Connect the USB Type-C cable to CN13 for powering the board and programming/debugging.
    • Alternatively, connect a 5V external power supply to the VIN pin on CN7 or a Li-Po battery to CN14.
  2. Programming the Microcontroller:

    • Use the integrated ST-LINK/V2-1 debugger for programming and debugging via USB.
    • Ensure JP2 is set to enable the ST-LINK functionality.
  3. Interfacing with Peripherals:

    • Use the Arduino-compatible headers (CN7) to connect external sensors, actuators, or shields.
    • For additional peripherals, use the STMod+ connector (CN10) or GPIO headers (CN8).
  4. Using the Display:

    • The onboard TFT-LCD can be used for GUI development. Libraries such as TouchGFX or STM32Cube can simplify this process.
  5. Data Logging:

    • Insert a microSD card into CN12 for data storage. Use the STM32 HAL libraries to interface with the card.

Important Considerations and Best Practices

  • Power Source Selection: Use JP1 to select the appropriate power source. Ensure only one power source is active at a time to avoid damage.
  • Static Protection: Handle the board with care to avoid electrostatic discharge (ESD) damage.
  • Firmware Updates: Regularly update the ST-LINK firmware and STM32CubeIDE to ensure compatibility with the latest features.
  • Debugging: Disable the ST-LINK debugger (via JP2) when not in use to reduce power consumption.

Example Code for Arduino-Compatible GPIO

Below is an example of toggling an LED connected to a GPIO pin on the CN7 header using STM32 HAL libraries:

#include "stm32l4xx_hal.h"

// Define the GPIO pin for the LED
#define LED_PIN GPIO_PIN_5
#define LED_PORT GPIOA

void SystemClock_Config(void);
void GPIO_Init(void);

int main(void) {
    HAL_Init(); // Initialize the HAL library
    SystemClock_Config(); // Configure the system clock
    GPIO_Init(); // Initialize GPIO for the LED

    while (1) {
        HAL_GPIO_TogglePin(LED_PORT, LED_PIN); // Toggle the LED state
        HAL_Delay(500); // Wait for 500 ms
    }
}

void GPIO_Init(void) {
    __HAL_RCC_GPIOA_CLK_ENABLE(); // Enable clock for GPIOA

    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = LED_PIN; // Configure the LED pin
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; // Set as push-pull output
    GPIO_InitStruct.Pull = GPIO_NOPULL; // No pull-up or pull-down resistor
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; // Low-speed operation
    HAL_GPIO_Init(LED_PORT, &GPIO_InitStruct); // Initialize the GPIO
}

void SystemClock_Config(void) {
    // System clock configuration code (auto-generated by STM32CubeMX)
}

Troubleshooting and FAQs

Common Issues and Solutions

  1. Board Not Powering On:

    • Ensure the USB cable is properly connected to CN13.
    • Verify that JP1 is set to the correct power source.
    • Check for any loose connections or damaged components.
  2. Unable to Program the Microcontroller:

    • Confirm that JP2 is set to enable the ST-LINK debugger.
    • Ensure the ST-LINK drivers are installed on your computer.
    • Verify that the STM32CubeIDE or other programming tools are correctly configured.
  3. Peripherals Not Responding:

    • Double-check the pin connections and ensure the correct GPIO pins are used.
    • Verify that the peripheral initialization code is correct.
  4. Display Not Working:

    • Ensure the display is properly connected and powered.
    • Use the appropriate libraries (e.g., TouchGFX) for GUI development.

FAQs

  • Can I use the board with an external debugger? Yes, you can connect an external debugger via the SWD pins on the CN7 header.

  • What is the maximum current draw for the board? The maximum current draw depends on the peripherals in use but typically does not exceed 500 mA when powered via USB.

  • Is the board compatible with Arduino libraries? While the board has Arduino-compatible headers, it requires STM32-specific libraries for programming.

  • Can I use the board for battery-powered applications? Yes, the board supports Li-Po batteries via CN14, making it suitable for portable applications.