1.. zephyr:board:: disco_l475_iot1
2
3Overview
4********
5
6The B-L475E-IOT01A Discovery kit for IoT node allows users to develop
7applications with direct connection to cloud servers.
8The Discovery kit enables a wide diversity of applications by exploiting
9low-power communication, multiway sensing and ARM |reg| Cortex |reg|-M4 core-based
10STM32L4 Series features.
11
12This kit provides:
13
14- 64-Mbit Quad-SPI (Macronix) Flash memory
15- Bluetooth |reg| V4.1 module (SPBTLE-RF)
16- Sub-GHz (868 or 915 MHz) low-power-programmable RF module (SPSGRF-868 or SPSGRF-915)
17- Wi-Fi |reg| module Inventek ISM43362-M3G-L44 (802.11 b/g/n compliant)
18- Dynamic NFC tag based on M24SR with its printed NFC antenna
19- 2 digital omni-directional microphones (MP34DT01)
20- Capacitive digital sensor for relative humidity and temperature (HTS221)
21- High-performance 3-axis magnetometer (LIS3MDL)
22- 3D accelerometer and 3D gyroscope (LSM6DSL)
23- 260-1260 hPa absolute digital output barometer (LPS22HB)
24- Time-of-Flight and gesture-detection sensor (VL53L0X)
25- 2 push-buttons (user and reset)
26- USB OTG FS with Micro-AB connector
27- Expansion connectors:
28        - Arduino |trade| Uno V3
29        - PMOD
30- Flexible power-supply options:
31        - ST LINK USB VBUS or external sources
32- On-board ST-LINK/V2-1 debugger/programmer with USB re-enumeration capability:
33        - mass storage, virtual COM port and debug port
34
35
36More information about the board can be found at the `Disco L475 IoT1 website`_.
37
38Hardware
39********
40
41The STM32L475VG SoC provides the following hardware IPs:
42
43- Ultra-low-power with FlexPowerControl (down to 120 nA Standby mode and 100 uA/MHz run mode)
44- Core: ARM |reg| 32-bit Cortex |reg|-M4 CPU with FPU, frequency up to 80 MHz, 100DMIPS/1.25DMIPS/MHz (Dhrystone 2.1)
45- Clock Sources:
46        - 4 to 48 MHz crystal oscillator
47        - 32 kHz crystal oscillator for RTC (LSE)
48        - Internal 16 MHz factory-trimmed RC ( |plusminus| 1%)
49        - Internal low-power 32 kHz RC ( |plusminus| 5%)
50        - Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by
51          LSE (better than |plusminus| 0.25 % accuracy)
52        - 3 PLLs for system clock, USB, audio, ADC
53- RTC with HW calendar, alarms and calibration
54- Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
55- 16x timers:
56        - 2x 16-bit advanced motor-control
57        - 2x 32-bit and 5x 16-bit general purpose
58        - 2x 16-bit basic
59        - 2x low-power 16-bit timers (available in Stop mode)
60        - 2x watchdogs
61        - SysTick timer
62- Up to 114 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
63- Memories
64        - Up to 1 MB Flash, 2 banks read-while-write, proprietary code readout protection
65        - Up to 128 KB of SRAM including 32 KB with hardware parity check
66        - External memory interface for static memories supporting SRAM, PSRAM, NOR and NAND memories
67        - Quad SPI memory interface
68- 4x digital filters for sigma delta modulator
69- Rich analog peripherals (independent supply)
70        - 2x 12-bit ADC 5 MSPS, up to 16-bit with hardware oversampling, 200 uA/MSPS
71        - 2x 12-bit DAC, low-power sample and hold
72        - 2x operational amplifiers with built-in PGA
73        - 2x ultra-low-power comparators
74- 18x communication interfaces
75        - USB OTG 2.0 full-speed, LPM and BCD
76        - 2x SAIs (serial audio interface)
77        - 3x I2C FM+(1 Mbit/s), SMBus/PMBus
78        - 6x USARTs (ISO 7816, LIN, IrDA, modem)
79        - 3x SPIs (4x SPIs with the Quad SPI)
80        - CAN (2.0B Active) and SDMMC interface
81        - SWPMI single wire protocol master I/F
82- 14-channel DMA controller
83- True random number generator
84- CRC calculation unit, 96-bit unique ID
85- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell |trade|
86
87
88More information about STM32L475VG can be found here:
89       - `STM32L475VG on www.st.com`_
90       - `STM32L475 reference manual`_
91
92Supported Features
93==================
94
95.. zephyr:board-supported-hw::
96
97Connections and IOs
98===================
99
100Disco L475 IoT Board has 8 GPIO controllers. These controllers are responsible for pin muxing,
101input/output, pull-up, etc.
102
103Note that LED LD1 and SPI1 SCK use the same GPIO pin and cannot be used simultaneously.
104
105Available pins:
106---------------
107
108For detailed information about available pins please refer to `STM32 Disco L475 IoT1 board User Manual`_.
109
110Default Zephyr Peripheral Mapping:
111----------------------------------
112
113- UART_1 TX/RX : PB6/PB7 (ST-Link Virtual Port Com)
114- UART_4 TX/RX : PA0/PA1 (Arduino Serial)
115- I2C1 SCL/SDA : PB8/PB9 (Arduino I2C)
116- I2C2 SCL/SDA : PB10/PB11 (Sensor I2C bus)
117- I2C3 SCL/SDA : PC0/PC1
118- SPI1 NSS/SCK/MISO/MOSI : PA2/PA5/PA6/PA7 (Arduino SPI)
119- SPI3 SCK/MISO/MOSI : PC10/PC11/PC12 (BT SPI bus)
120- PWM_2_CH1 : PA15
121- PWM_15_CH1 : PB14 (LD2)
122- USER_PB : PC13
123- LD1 : PA5 (same as SPI1 SCK)
124- LD2 : PB14
125- ADC12_IN5 : PA0
126- ADC123_IN3 : PC2
127- ADC123_IN4 : PC3
128- ADC12_IN13 : PC4
129- ADC12_IN14 : PC5
130- DAC1_OUT1 : PA4
131
132System Clock
133------------
134
135Disco L475 IoT System Clock could be driven by internal or external oscillator,
136as well as main PLL clock. By default System clock is driven by PLL clock at 80MHz,
137driven by 16MHz high speed internal oscillator.
138
139Serial Port
140-----------
141
142Disco L475 IoT board has 6 U(S)ARTs. The Zephyr console output is assigned to UART1.
143Default settings are 115200 8N1.
144
145
146Programming and Debugging
147*************************
148
149Disco L475 IoT board includes an ST-LINK/V2-1 embedded debug tool interface.
150
151Applications for the ``disco_l475_iot1`` board configuration can be built and
152flashed in the usual way (see :ref:`build_an_application` and
153:ref:`application_run` for more details).
154
155Flashing
156========
157
158The board is configured to be flashed using west `STM32CubeProgrammer`_ runner,
159so its :ref:`installation <stm32cubeprog-flash-host-tools>` is required.
160
161Alternatively, OpenOCD or JLink can also be used to flash the board using
162the ``--runner`` (or ``-r``) option:
163
164.. code-block:: console
165
166   $ west flash --runner openocd
167   $ west flash --runner jlink
168
169Flashing an application to Disco L475 IoT
170-----------------------------------------
171
172Here is an example for the :zephyr:code-sample:`hello_world` application.
173
174Connect the Disco L475 IoT to your host computer using the USB port, then
175run a serial host program to connect with your Nucleo board. For example:
176
177.. code-block:: console
178
179   $ minicom -D /dev/ttyACM0
180
181Then build and flash the application:
182
183.. zephyr-app-commands::
184   :zephyr-app: samples/hello_world
185   :board: disco_l475_iot1
186   :goals: build flash
187
188You should see the following message on the console:
189
190.. code-block:: console
191
192   $ Hello World! arm
193
194Debugging
195=========
196
197You can debug an application in the usual way.  Here is an example for the
198:zephyr:code-sample:`hello_world` application.
199
200.. zephyr-app-commands::
201   :zephyr-app: samples/hello_world
202   :board: disco_l475_iot1
203   :maybe-skip-config:
204   :goals: debug
205
206.. _Disco L475 IoT1 website:
207   https://www.st.com/content/st_com/en/products/evaluation-tools/product-evaluation-tools/mcu-eval-tools/stm32-mcu-eval-tools/stm32-mcu-discovery-kits/b-l475e-iot01a.html
208
209.. _STM32 Disco L475 IoT1 board User Manual:
210   https://www.st.com/resource/en/user_manual/dm00347848.pdf
211
212.. _STM32L475VG on www.st.com:
213   https://www.st.com/en/microcontrollers-microprocessors/stm32l475vg.html
214
215.. _STM32L475 reference manual:
216   https://www.st.com/resource/en/reference_manual/dm00083560.pdf
217
218.. _STM32CubeProgrammer:
219   https://www.st.com/en/development-tools/stm32cubeprog.html
220