Q: How to implement I2C communication on STM32 avoiding common pitfalls? Answer STM32 I2C issues usually stem from: wrong pin configuration (open-drain required) missing pull-up resistors (2.2-10 kOhm) or clock stretching timing conflicts. Use Standard Mode (100 kHz) or Fast…
Q: What is the STM32 ADC configuration for multi-channel sampling at high accuracy? Answer For multi-channel ADC with high accuracy: use independent power supplies (VDDA/VSSA) or at minimum filter VDDA with LC (10 uH + 10 uF) for analog section…
Q: How to use STM32 SPI in master and slave mode with DMA? Answer In master mode STM32 controls the clock (SCK). Configure CPOL and CPHA to match the slave device. For high-speed SPI (>10 MHz) use GPIO output speed…
Q: What are the common causes of STM32 hard faults and how to debug them? Answer Hard faults on STM32 typically result from: accessing unmapped memory (MPU violation) dividing by zero unaligned memory access executing from SRAM with cache enabled…
Q: How to implement CAN bus communication on STM32 with bxCAN or FDCAN? Answer The bxCAN peripheral on STM32F2xx/F4xx supports CAN 2.0A/B at up to 1 Mbps. Configure TX and RX pins with appropriate alternate functions. Set the baud rate:…
Q: What is the correct way to configure STM32 UART/USART with DMA and interrupts? Answer Configure UART TX pin as alternate function push-pull; RX pin as input floating. Enable UART clock before GPIO configuration. Set baud rate: Baud = UARTCLK…
Q: How to implement FreeRTOS on STM32: task creation priority and stack sizing? Answer FreeRTOS on STM32 is initialized via vTaskStartScheduler() after hardware setup. Task creation uses xTaskCreate() with parameters: task function name stack depth (in words not bytes) parameters…
Q: How to handle STM32 GPIO pins safely: input output floating and analog modes? Answer Each GPIO pin has four speed settings (low/medium/high/very high) controlling slew rate and power consumption. For low-power applications use the lowest speed that meets timing…
Q: What are the different STM32 low-power modes and when to use each? Answer STM32 offers four low-power modes: Sleep (CPU stopped peripherals active ~100 uA) Low-power Run (code at low frequency from LSI ~8 uA) Stop (all clocks stopped…
Q: How to use STM32 DMA controller efficiently for UART SPI and ADC? Answer DMA (Direct Memory Access) offloads data transfers from the CPU. For UART use DMA with a circular buffer for RX to avoid losing bytes during interrupt…