Differences

This shows you the differences between two versions of the page.

--- stm32:peripherals:exti [2019/09/16 07:24] – [Setup Peripheral (e.g. GPIOA Pin 5)] kjaz
+++ stm32:peripherals:exti [2022/12/28 08:29] (current) – [SYSCFG_EXTICR4 - External interrupt configuration register 4] ruan
@@ Line 18: / Line 18: @@
 \\
-===== Programming Example =====
-==== Setup Peripheral (e.g. GPIOA Pin 5) ====
-<code c>
-#include "reg_stm32f4xx.h"
-RCC->AHB1ENR |= (0x1 << 0u);    /* Enable GPIOA clock */
-/* Configure GPIO pin A.5 as input. */
-GPIOA->MODER &= ~(0x3 << 10u);    /* Clear existing mode bits 10 and 11. */
-GPIOA->PUPDR &= ~(0x3 << 10u);    /* Clear existing pull-up/-down bits 10 and 11. */
-GPIOA->PUPDR |= (0x1 << 10u);     /* Set pin 5 to pull-up mode. */
-</code>
-\\
-==== Setup SYSCFG ====
-To choose which GPIO peripheral should trigger EXTI line 5 you have to configure the SYSCFG register.
-<code c>
-#include "reg_stm32f4xx.h"
-SYSCFG->EXTICR[1] |= (0u << 4u);  /* Set EXTI5 to GPIOA. */
-</code>
-\\
-==== Setup EXTI ====
-<code c>
-#include "reg_stm32f4xx.h"
-EXTI->RTSR |= (0x1 << 5u);         /* Trigger on rising edge. */
-EXTI->IMR |= (0x1 << 5u);          /* Unmask interrupt line. */
-</code>
-\\
-==== Setup NVIC ====
-<code c>
-#include "reg_stm32f4xx.h"
-NVIC->ISER[0] |= (0x1 << 23u);     /* Enable EXTI5 interrupt. */
-</code>
-\\
 ===== Configuration Register =====
-==== SYSCFG - EXTICRx ====
+==== SYSCFG_EXTICR1 - External interrupt configuration register 1 ====
-=== EXTICR1 ===
-External interrupt configuration register 1
 \\ {{syscfg_reg_exticr1.svg}} \\ \\
-=== EXTICR2 ===
+==== SYSCFG_EXTICR2 - External interrupt configuration register 2 ====
-External interrupt configuration register 2
 \\ {{syscfg_reg_exticr2.svg}} \\ \\
-=== EXTICR3 ===
+==== SYSCFG_EXTICR3 - External interrupt configuration register 3 ====
-External interrupt configuration register 3
 \\ {{syscfg_reg_exticr3.svg}} \\ \\
-=== EXTICR4 ===
+==== SYSCFG_EXTICR4 - External interrupt configuration register 4 ====
-External interrupt configuration register 4
 \\ {{syscfg_reg_exticr4.svg}} \\ \\
+Select the source input for EXTI
 |< 100% 5em 5em >|
 |EXTIx|0000|GPIOA pin x (reset state)|
@@ Line 100: / Line 46: @@
 \\
-==== EXTI - RTSR / FTSR ====
+==== EXTI_RTSR / EXTI_FTSR  - Rising / falling trigger selection register ====
-Rising / falling trigger selection register
 \\ {{exti_reg_xtsr.svg}} \\ \\
@@ Line 111: / Line 55: @@
 \\
-==== EXTI - IMR ====
+==== EXTI_IMR - Interrupt mask register ====
-Interrupt mask register
 \\ {{exti_reg_imr.svg}} \\ \\
@@ Line 122: / Line 64: @@
 \\
-==== EXTI - PR ====
+==== EXTI_PR - Pending register ====
-Pending register
 \\ {{exti_reg_pr.svg}} \\ \\
@@ Line 132: / Line 72: @@
 |:::|1|Selected trigger request occured|
 * This bit is set when the selected edge event arrives on the external interrupt line x. This bis is cleared by programming it to '1'
+===== Programming Example =====
+==== Setup Peripheral (e.g. GPIOA Pin 5) ====
+<code c>
+#include "reg_stm32f4xx.h"
+RCC->AHB1ENR |= (0x1 << 0u);    /* Enable GPIOA clock */
+/* Configure GPIO pin A.5 as input. */
+GPIOA->MODER &= ~(0x3 << 10u);    /* Clear existing mode bits 10 and 11. */
+GPIOA->PUPDR &= ~(0x3 << 10u);    /* Clear existing pull-up/-down bits 10 and 11. */
+GPIOA->PUPDR |= (0x1 << 10u);     /* Set pin 5 to pull-up mode. */
+</code>
+\\
+==== Setup SYSCFG ====
+To choose which GPIO peripheral should trigger EXTI line 5 you have to configure the SYSCFG register.
+<code c>
+#include "reg_stm32f4xx.h"
+SYSCFG->EXTICR2 |= (0u << 4u);  /* Set EXTI5 to GPIOA. */
+</code>
+\\
+==== Setup EXTI ====
+<code c>
+#include "reg_stm32f4xx.h"
+EXTI->RTSR |= (0x1 << 5u);         /* Trigger on rising edge. */
+EXTI->IMR |= (0x1 << 5u);          /* Unmask interrupt line. */
+</code>
+\\
+==== Setup NVIC ====
+<code c>
+#include "reg_stm32f4xx.h"
+NVIC->ISER0 |= (0x1 << 23u);     /* Enable EXTI5 interrupt. */
+</code>
+\\