Freertos Interrupt Example
This is a FreeRTOS USART TX-RX interrupts example for STM32F407, especially for STM32F4-Discovery.It is GPIO example extended with FreeRTOS library.
Tools and software requirements
GNU toolchainfor ARM Cortex-M.
stlink STM32 debug & flash utilitywritten by texane for Linux.
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STM32F4 library STM32F4 DSP and standard peripherals library.
FreeRTOS FreeRTOS library.
Contribute to starnight/STM32F4 development by creating an account on GitHub. This is a FreeRTOS USART TX-RX interrupts example for STM32F407, especially for STM32F4-Discovery. It is GPIO example extended with FreeRTOS library. Tools and software requirements.
If you look at the demos that are distributed with FreeRTOS, there are examples of using queue inside of Interrupt handlers. For example, the serial ports in the demos run based on using a queue. The biggest thing to remember is that inside an Interrupt handler, you should only call FreeRTOS functions that end in FromISR, and none of these functions will offer the opertunity to ‘block’ for something, as ISRs. Downlaod the FreeRtos files form the github and paste into the library folder of arduino. The folder structure should be as shown below. Running First Example. Now run the the IDE and open the first example from File-Examples-FreeRTOS-01-TaskSwitching as shown in below image. Compile and upload the code. Open the serial monitor to see the. Hardware interrupt with FreeRTOS binary semaphore. An alternative solution to a polling task is to use a hardware interrupt for teh button and have either the polling task block on an event from the ISR, or have the ISR give the semaphore directly - in either case you will have to deal with debounce. UART Interrupts in FreeRTOS with. If you look at the demos that are distributed with FreeRTOS, there are examples of using queue inside of Interrupt handlers. For example, the serial ports in the demos run based on using a queue. The biggest thing to remember is that inside an Interrupt handler, you should only call FreeRTOS functions that end in FromISR, and none of these functions will offer the opertunity to 'block' for something, as ISRs shouldn't want to wait.
Freertos Interrupt Example Stm32
Hardware
According to the schematic of STM32F4-Discovery Peripherals:
Freertos Priority
LED4 (Green): PD12 connected to LD4
LED3 (Orange): PD13 connected to LD3
LED5 (Red): PD14 connected to LD5
LED6 (Blue): PD15 connected to LD6
User Button: PA0 connected to B1
USART6 TX: PC6
USART6 RX: PC7
Usage
Stm32 Freertos Pdf
Edit the Makefile to modify the 'STM_DIR' to the path of STM32F4 DSP andstandard peripherals library.
Edit the Makefile to modify the 'FREERTOS_DIR' to the path of FreeRTOSlibrary.
Compile:
makeFlash to STM32F407:
make flashReset the power of STM32F4-Discovery.
Get a terminal connected with the right UART settings to USART6 on STM32F407. (115200 baud rate, 8 data bits, 1 stop bit, no parity check and non-flow control.)
Press any key and it will echo.