ST B_L4S5I_IOT01A Discovery kit
Overview
The B_L4S5I_IOT01A Discovery kit features an ARM Cortex-M4 based STM32L4S5VI MCU with a wide range of connectivity support and configurations. Here are some highlights of the B_L4S5I_IOT01A Discovery kit:
STM32L4S5VIT6 microcontroller featuring 2 Mbyte of Flash memory, 640 Kbytes of RAM in LQFP100 package
On-board ST-LINK/V2-1 supporting USB re-enumeration capability
Three different interfaces supported on USB:
Virtual com port
Mass storage
Debug port
ARDUINO ® Uno V3 and Pmod TM expansion connector
4 LEDs (2 for user, wifi, BLE)
2 push-buttons (user and reset)
USB OTG FS with micro-AB connector
Dynamic NFC tag
2 digital omnidirectional microphones
Capacitive digital sensor for relative humidity and temperature
Time-of-flight and gesture-detection sensors
High-performance 3-axis magnetometer
3D accelerometer and 3D gyroscope
64-Mbit Quad-SPI Flash memory
Bluetooth ® 4.1 module
802.11 b/g/n compliant Wi‐Fi ® module
MCU current ammeter with 4 ranges and auto-calibration
- Flexible power supply options:
ST-LINK/V2-1
USB FS connector
External 5 V
More information about the board can be found at the B L4S5I IOT01A Discovery kit website.
Hardware
The STM32L4S5VI SoC provides the following hardware features:
Ultra-low-power with FlexPowerControl (down to 130 nA Standby mode and 100 uA/MHz run mode)
Core: ARM® 32-bit Cortex®-M4 CPU with FPU, frequency up to 120 MHz, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1)
- Clock Sources:
4 to 48 MHz crystal oscillator
32 kHz crystal oscillator for RTC (LSE)
Internal 16 MHz factory-trimmed RC ( ±1%)
Internal low-power 32 kHz RC ( ±5%)
Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
3 PLLs for system clock, USB, audio, ADC
RTC with HW calendar, alarms and calibration
Up to 21 capacitive sensing channels: support touchkey, linear and rotary touch sensors
- 16x timers:
2x 16-bit advanced control
2x 32-bit and 5x 16-bit general purpose
2x 16-bit basic
2x low-power 16-bit timers (available in Stop mode)
2x watchdogs
SysTick timer
Up to 83 fast I/Os, most 5 V-tolerant
- Memories
Up to 2 MB Flash, 2 banks read-while-write, proprietary code readout protection
Up to 640 KB of SRAM including 32 KB with hardware parity check
External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
Octo SPI memory interface
4x digital filters for sigma delta modulator
- Rich analog peripherals (independent supply)
1x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 uA/MSPS
2x 12-bit DAC, low-power sample and hold
2x operational amplifiers with built-in PGA
2x ultra-low-power comparators
- 18x communication interfaces
USB OTG 2.0 full-speed, LPM and BCD
2x SAIs (serial audio interface)
4x I2C FM+(1 Mbit/s), SMBus/PMBus
6x USARTs (ISO 7816, LIN, IrDA, modem)
3x SPIs (4x SPIs with the Quad SPI)
CAN (2.0B Active) and SDMMC interface
SDMMC I/F
DCMI camera interface
14-channel DMA controller with multiplex request router
True random number generator
CRC calculation unit, 96-bit unique ID
AES and HASH hardware accelerators
Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
- More information about STM32L4S5VI can be found here:
Supported Features
The Zephyr b_l4s5i_iot01a board configuration supports the following hardware features:
Interface |
Controller |
Driver/Component |
|---|---|---|
NVIC |
on-chip |
nested vector interrupt controller |
UART |
on-chip |
serial port-polling; serial port-interrupt |
PINMUX |
on-chip |
pinmux |
GPIO |
on-chip |
gpio |
I2C |
on-chip |
i2c |
SPI |
on-chip |
spi |
PWM |
on-chip |
pwm |
WATCHDOG |
on-chip |
independent watchdog |
BLE |
module |
bluetooth |
WIFI |
module |
es-wifi |
The default configuration can be found in the defconfig file:
Connections and IOs
B_L4S5I_IOT01A Discovery kit has 9 GPIO controllers (from A to I). These controllers are responsible for pin muxing, input/output, pull-up, etc.
For more details please refer to B L47S5I IOT01A board User Manual.
Default Zephyr Peripheral Mapping:
UART_1 TX/RX : PB6/PB7 (ST-Link Virtual Port Com)
UART_4 TX/RX : PA0/PA1 (Arduino Serial)
I2C1 SCL/SDA : PB8/PB9 (Arduino I2C)
I2C2 SCL/SDA : PB10/PB11 (Sensor I2C bus)
SPI1 NSS/SCK/MISO/MOSI : PA2/PA5/PA6/PA7 (Arduino SPI)
SPI3 SCK/MISO/MOSI : PC10/PC11/PC12 (BT SPI bus)
PWM_2_CH1 : PA15
LD1 : PA5
LD2 : PB14
user button : PC13
System Clock
B_L4S5I_IOT01A Discovery System Clock could be driven by an internal or external oscillator, as well as the main PLL clock. By default the System clock is driven by the PLL clock at 80MHz, driven by 16MHz high speed internal oscillator.
Serial Port
B_L4S5I_IOT01A Discovery kit has 4 U(S)ARTs. The Zephyr console output is assigned to UART1. Default settings are 115200 8N1.
Programming and Debugging
Flashing
B_L4S5I_IOT01A Discovery kit includes an ST-LINK/V2-1 embedded debug tool interface. This interface is supported by the openocd version included in Zephyr SDK.
Flashing an application to B_L4S5I_IOT01A Discovery kit
Connect the B_L4S5I_IOT01A Discovery kit to your host computer using the USB port, then run a serial host program to connect with your Discovery board. For example:
$ minicom -D /dev/ttyACM0
Then, build and flash in the usual way. Here is an example for the Hello World application.
# From the root of the zephyr repository
west build -b b_l4s5i_iot01a samples/hello_world
west flash
You should see the following message on the console:
Hello World! arm
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 b_l4s5i_iot01a samples/hello_world
west debug