STM32L1 Discovery
Overview
The two generations of the STM32L1 Discovery development boards come with an integrated ST-LINK/V2 debugger and programmer. The boards have a 24-segment LCD and a touch slider, along with two user LEDs and a user button. Support circuitry for measuring power consumption is also available. It also comes with a comprehensive STM32 software HAL library and various packaged software examples.
There are two variants of the board:
STM32LDISCOVERY targets STM32L152RBT6, with 128K flash, 16K RAM, 4K EEPROM
STM32L152CDISCOVERY targets STM32L152RCT6, with 256K flash, 32K RAM, 8K EEPROM
The STM32LDISCOVERY is no longer sold, but was widely available. stm32l1_disco configuration enables support for STM32LDISCOVERY board and stm32l152c_disco configuration enables support for STM32L152CDISCOVERY board.
More information about the board can be found at the STM32LDISCOVERY website [1].
Hardware
The STM32 Discovery board features:
On-board ST-LINK/V2 with selection mode switch to use the kit as a standalone ST-LINK/V2 (with SWD connector for programming and debugging)
Board power supply: through USB bus or from an external 5 V supply voltage
External application power supply: 3 V and 5 V
Four LEDs:
LD1 (red) for 3.3 V power on
LD2 (red/green) for USB communication
LD3 (green) for PC9 output
LD4 (blue) for PC8 output
Two push buttons (user and reset)
Extension header for all LQFP64 I/Os for quick connection to prototyping board and easy probing
More information about STM32L151x can be found in the STM32L1x reference manual [2].
Supported Features
The stm32l1_disco 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.
stm32l1_disco/stm32l151xb target
Type |
Location |
Description |
Compatible |
|---|---|---|---|
CPU |
on-chip |
ARM Cortex-M3 CPU1 |
|
ADC |
on-chip |
STM32F4 ADC1 |
|
Clock control |
on-chip |
STM32 RCC (Reset and Clock controller)1 |
|
on-chip |
STM32 HSE Clock1 |
||
on-chip |
|||
on-chip |
STM32L0/L1 Multi Speed Internal Clock1 |
||
on-chip |
STM32L0/L1 Main PLL1 |
||
Counter |
on-chip |
STM32 counters6 |
|
DAC |
on-chip |
STM32 family DAC1 |
|
DMA |
on-chip |
STM32 DMA controller (V2bis) for the stm32F0, stm32F1 and stm32L1 soc families1 |
|
Flash controller |
on-chip |
STM32 Family flash controller1 |
|
GPIO & Headers |
on-chip |
STM32 GPIO Controller6 |
|
I2C |
on-chip |
STM32 I2C V1 controller2 |
|
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 |
||
LED |
on-board |
Group of GPIO-controlled LEDs1 |
|
Memory controller |
on-chip |
STM32 Battery Backed RAM1 |
|
MTD |
on-chip |
STM32F4 flash memory1 |
|
on-chip |
STM32 on-chip EEPROM1 |
||
Pin control |
on-chip |
STM32 Pin controller1 |
|
PWM |
on-chip |
STM32 PWM6 |
|
Reset controller |
on-chip |
STM32 Reset and Clock Control (RCC) Controller1 |
|
RTC |
on-chip |
STM32 RTC1 |
|
Sensors |
on-chip |
STM32 family TEMP node for production calibrated sensors with two calibration temperatures1 |
|
on-chip |
STM32 VREF+1 |
||
Serial controller |
on-chip |
STM32 USART3 |
|
on-chip |
STM32 UART2 |
||
SMbus |
on-chip |
STM32 SMBus controller2 |
|
SPI |
on-chip |
STM32 SPI controller2 |
|
SRAM |
on-chip |
Generic on-chip SRAM description1 |
|
Timer |
on-chip |
ARMv7-M System Tick1 |
|
on-chip |
STM32 timers6 |
||
Watchdog |
on-chip |
STM32 watchdog1 |
|
on-chip |
STM32 system window watchdog1 |
Connections and IOs
Each of the GPIO pins can be configured by software as output (push-pull or open-drain), as input (with or without pull-up or pull-down), or as peripheral alternate function. Most of the GPIO pins are shared with digital or analog alternate functions. All GPIOs are high current capable except for analog inputs.
Default Zephyr Peripheral Mapping:
UART_1_TX : PA9
UART_1_RX : PA10
UART_2_TX : PA2
UART_2_RX : PA3
I2C1_SCL : PB6
I2C1_SDA : PB7
I2C2_SCL : PB10
I2C2_SDA : PB11
SPI1_NSS : PA4
SPI1_SCK : PA5
SPI1_MISO : PA6
SPI1_MOSI : PA7
SPI2_NSS : PB12
SPI2_SCK : PB13
SPI2_MISO : PB14
SPI2_MOSI : PB15
For more details please refer to STM32L1DISCOVERY board User Manual [3].
Programming and Debugging
STM32L1DISCOVERY and STM32L152CDISCOVERY boards include an ST-LINK/V2 embedded debug tool interface.
Applications for the stm32l1_disco board configuration can be built and
flashed in the usual way (see Building an Application and
Run an Application for more details).
Flashing
The board is configured to be flashed using west STM32CubeProgrammer [4] 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 an application
Here is an example for the Blinky application.
# From the root of the zephyr repository
west build -b stm32l1_disco samples/basic/blinky
west flash
You will see the LED blinking every second.
Debugging
You can debug an application in the usual way. Here is an example for the Blinky application.
# From the root of the zephyr repository
west build -b stm32l1_disco samples/basic/blinky
west debug