1cdcfb6e93
Features supported :
- the 8 STM32L4x5 GPIOs are initialized with their reset values
(except IDR, see below)
- input mode : setting a pin in input mode "externally" (using input
irqs) results in an out irq (transmitted to SYSCFG)
- output mode : setting a bit in ODR sets the corresponding out irq
(if this line is configured in output mode)
- pull-up, pull-down
- push-pull, open-drain
Difference with the real GPIOs :
- Alternate Function and Analog mode aren't implemented :
pins in AF/Analog behave like pins in input mode
- floating pins stay at their last value
- register IDR reset values differ from the real one :
values are coherent with the other registers reset values
and the fact that AF/Analog modes aren't implemented
- setting I/O output speed isn't supported
- locking port bits isn't supported
- ADC function isn't supported
- GPIOH has 16 pins instead of 2 pins
- writing to registers LCKR, AFRL, AFRH and ASCR is ineffective
Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20240305210444.310665-2-ines.varhol@telecom-paris.fr
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
46 lines
1.4 KiB
ReStructuredText
46 lines
1.4 KiB
ReStructuredText
B-L475E-IOT01A IoT Node (``b-l475e-iot01a``)
|
|
============================================
|
|
|
|
The B-L475E-IOT01A IoT Node uses the STM32L475VG SoC which is based on
|
|
ARM Cortex-M4F core. It is part of STMicroelectronics
|
|
:doc:`STM32 boards </system/arm/stm32>` and more specifically the STM32L4
|
|
ultra-low power series. The STM32L4x5 chip runs at up to 80 MHz and
|
|
integrates 128 KiB of SRAM and up to 1MiB of Flash. The B-L475E-IOT01A board
|
|
namely features 64 Mibit QSPI Flash, BT, WiFi and RF connectivity,
|
|
USART, I2C, SPI, CAN and USB OTG, as well as a variety of sensors.
|
|
|
|
Supported devices
|
|
"""""""""""""""""
|
|
|
|
Currently B-L475E-IOT01A machine's only supports the following devices:
|
|
|
|
- Cortex-M4F based STM32L4x5 SoC
|
|
- STM32L4x5 EXTI (Extended interrupts and events controller)
|
|
- STM32L4x5 SYSCFG (System configuration controller)
|
|
- STM32L4x5 RCC (Reset and clock control)
|
|
- STM32L4x5 GPIOs (General-purpose I/Os)
|
|
|
|
Missing devices
|
|
"""""""""""""""
|
|
|
|
The B-L475E-IOT01A does *not* support the following devices:
|
|
|
|
- Serial ports (UART)
|
|
- Analog to Digital Converter (ADC)
|
|
- SPI controller
|
|
- Timer controller (TIMER)
|
|
|
|
See the complete list of unimplemented peripheral devices
|
|
in the STM32L4x5 module : ``./hw/arm/stm32l4x5_soc.c``
|
|
|
|
Boot options
|
|
""""""""""""
|
|
|
|
The B-L475E-IOT01A machine can be started using the ``-kernel``
|
|
option to load a firmware. Example:
|
|
|
|
.. code-block:: bash
|
|
|
|
$ qemu-system-arm -M b-l475e-iot01a -kernel firmware.bin
|
|
|