GPIO EXTI Block Description
This block enables the usage of GPIO in External Interrupt Mode (EXTI) within STM microcontrollers.
Table of Contents
Inputs
This block has no inputs.
Outputs
| Output Name | Type | Description |
|---|---|---|
| Rising edge IRQ | bool | Conditional output Output port returning an interrupt trigger on a rising edge signal. This port is accessible when the Select Edge parameter is configured to Rising. |
| Falling edge IRQ | bool | Conditional output Output port returning an interrupt trigger on a falling edge signal. This port is accessible when the Select Edge parameter is configured to Falling. |
| Rising/Falling edge IRQ | bool | Conditional output Output port returning an interrupt trigger on both rising and falling edge signals. This port is accessible when the Select Edge parameter is configured to Rising/Falling. |
Block Parameters
| Parameter | Description |
|---|---|
| Line | EXTI hardware line index number. |
| Port | GPIO port identifier letter, e.g., 'A', 'B', 'C', etc. |
| Select Edge | Configures the edge event condition that triggers the hardware interrupt:Rising – rising edge trigger.Falling – falling edge trigger.Rising/Falling – both edge triggers active. |
CubeMX Configuration for a Given MCU Model
H7
| No. | Name | Path | Setting | Description | Screenshot |
|---|---|---|---|---|---|
| 1 | GPIO PIN as GPIO_EXTI* | Pinout & Configuration > Pinout view > Right-click the selected pin > GPIO_EXTI* | GPIO_EXTI* | Selects the target GPIO pin assigned for EXTI functionality. The pin must be explicitly configured as GPIO_EXTI. |  |
| 2 | GPIO Mode | Pinout & Configuration > System Core > GPIO > GPIO > Left-click the selected pin > GPIO Mode | External Interrupt Mode with the selected edge | Selects the operation mode for the GPIO pin. This configuration must match the block parameter setting. |  |
| 3 | Interrupts | Pinout & Configuration > System Core > GPIO > NVIC | Enable | Enables the core hardware interrupt channel for the specified GPIO pin. |  |
| 4 | Preemption and Sub Priority | Pinout & Configuration > System Core > NVIC > NVIC > selected GPIO EXTI line > Preemption Priority and Sub Priority | Select desired user priority values | Configures the relative priority rankings for the designated GPIO pin interrupt. |  |
| 5 | Generate IRQ handler | Pinout & Configuration > System Core > NVIC > Code generation > Generate IRQ Handler | Enabled | Generates the corresponding interrupt service routine (ISR) function handler for the selected pin. |  |
GPIO_EXTI* – the * symbol represents the specific EXTI line number assigned to the chosen GPIO pin. Depending on the MCU model, different physical pins map to specific internal EXTI hardware lines.
See Also
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