I've got a STM32CubeMX made project for running on stm32f401re using proteus. I need e shared variable named "mode" on two compiling units named main.c and stm32f4xx_it.c.
I've got the following definition on main.c:
char mode = 0; // 0: welcome, 1: timer running, 2: timer paused, 3: shutdown
And the following on stm32f4xx_it.c:
extern char mode; // 0: welcome, 1: timer running, 2: timer paused, 3: shutdown
I've got the following code on handling interrupt:
void EXTI0_IRQHandler(void) { /* USER CODE BEGIN EXTI0_IRQn 0 */ if (mode!=3){ mode = 1; } /* USER CODE END EXTI0_IRQn 0 */ HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0); /* USER CODE BEGIN EXTI0_IRQn 1 */ /* USER CODE END EXTI0_IRQn 1 */ }
The interrupt routine is called fine but the mode doesn't change, since the function of the microcontroller doesn't change as I've programmed on main.c file.