jakubstandarski/stm32f4xx_projects

Repository containing projects based on STM32F4xx microcontrollers.

STM32F4xx: Tutorials | Projects | Knowledge

• Overview
  • Goal
  • Topics
  • System requirements

Overview

Goal

Introduction into embedded systems based on STM32F4xx microcontrollers.

Topics

Microcontrolles (boards):

• STM32F407xx (STM32F407G-DISC1)
• STM32F413xx (STM32 NUCLEO-F413ZH)
• STM32F401xx (STM32 NUCLEO-F401RE) [DEPRECATED]

Peripherals:

• Clocks (HSI, HSE, PLL)
• Timers
• RTC
• GPIOs
• ADC
• I2C
• SPI
• USART/UART
• DMA

Programming:

• Makefile
• Cross-compilation
• Linker script
• Startup code
• Low-layer API
• HAL

System requirements

• OS: Ubuntu 20.04
• Toolchain: GNU Arm Embedded Toolchain 9-2020-q2-update 9.3.1
• Third party packages: STM32CubeF4

stm32f4xx_projects's Issues

CMSIS_OS_V2: osErrorISR returned by osKernelInitialize(), osThreadNew(), osKernelStart()

PROBLEM: any of the OS functions returns osErrorISR.

Description
Each OS function call returns osErrorISR. What is more, IS_IRQ() function returns value: 32 decimal. It should not happen, because none of the IRQ is not defined.

/**
osStatus_t osKernelInitialize (void) {
  osStatus_t stat;

  if (IS_IRQ()) {
    stat = osErrorISR;
  }
  else {
    if (KernelState == osKernelInactive) {
      #if defined(USE_FREERTOS_HEAP_5) && (HEAP_5_REGION_SETUP == 1)
        vPortDefineHeapRegions (configHEAP_5_REGIONS);
      #endif
      KernelState = osKernelReady;
      stat = osOK;
    } else {
      stat = osError;
    }
  }

  return (stat);
}

/**
  \brief   Get IPSR Register
  \details Returns the content of the IPSR Register.
  \return               IPSR Register value
 */
__STATIC_FORCEINLINE uint32_t __get_IPSR(void)
{
  uint32_t result;

  __ASM volatile ("MRS %0, ipsr" : "=r" (result) );
  return(result);
}

The most interesting fact is that, such problem occurs only if functions responsible of reading GPIO pin are used, such as:

LL_GPIO_IsInputPinSet(GPIOA, LL_GPIO_PIN_3)  or
LL_GPIO_IsOutputPinSet(GPIOA, LL_GPIO_PIN_2)