Differences

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

--- stm32:peripherals:exti [2016/10/06 11:50] – [Setup SYSCFG] feur
+++ stm32:peripherals:exti [2022/12/28 08:29] (current) – [SYSCFG_EXTICR4 - External interrupt configuration register 4] ruan
@@ Line 17: / Line 17: @@
 |22|RTC wakeup interrupt|
 \\
+===== Configuration Register =====
+==== SYSCFG_EXTICR1 - External interrupt configuration register 1 ====
+\\ {{syscfg_reg_exticr1.svg}} \\ \\
+==== SYSCFG_EXTICR2 - External interrupt configuration register 2 ====
+\\ {{syscfg_reg_exticr2.svg}} \\ \\
+==== SYSCFG_EXTICR3 - External interrupt configuration register 3 ====
+\\ {{syscfg_reg_exticr3.svg}} \\ \\
+==== SYSCFG_EXTICR4 - 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)|
+|:::|0001|GPIOB pin x|
+|:::|...|
+|:::|1010|GPIOK pin x|
+\\
+==== EXTI_RTSR / EXTI_FTSR  - Rising / falling trigger selection register ====
+\\ {{exti_reg_xtsr.svg}} \\ \\
+|< 100% 5em 5em >|
+|TRx|0|Trigger for EXTI line x disabled (reset state)|
+|:::|1|Trigger for EXTI line x enabled|
+\\
+==== EXTI_IMR - Interrupt mask register ====
+\\ {{exti_reg_imr.svg}} \\ \\
+|< 100% 5em 5em >|
+|MRx|0|Interrupt request for EXTI line x masked (reset state)|
+|:::|1|Interrupt request for EXTI line x unmasked|
+\\
+==== EXTI_PR - Pending register ====
+\\ {{exti_reg_pr.svg}} \\ \\
+|< 100% 5em 5em >|
+|PRx*|0|No trigger request occurred|
+|:::|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 =====
@@ Line 23: / Line 78: @@
 <code c>
-#include "reg_stm32f4xx.h"
 #include "reg_stm32f4xx.h"
-RCC->AHBENR[0] |= (0x1 << 0u);    /* Enable GPIOA clock */
+RCC->AHB1ENR |= (0x1 << 0u);    /* Enable GPIOA clock */
-/* Configure GPIO pin A.10 as input. */
+/* Configure GPIO pin A.5 as input. */
 GPIOA->MODER &= ~(0x3 << 10u);    /* Clear existing mode bits 10 and 11. */
@@ Line 43: / Line 97: @@
 #include "reg_stm32f4xx.h"
-SYSCFG->EXTICR[1] |= (0u << 4u);  /* Set EXTI5 to GPIOA. */
+SYSCFG->EXTICR2 |= (0u << 4u);  /* Set EXTI5 to GPIOA. */
 </code>
 \\
@@ Line 62: / Line 116: @@
 #include "reg_stm32f4xx.h"
-NVIC->ISER[0] |= (0x1 << 23u);     /* Enable EXTI5 interrupt. */
+NVIC->ISER0 |= (0x1 << 23u);     /* Enable EXTI5 interrupt. */
 </code>
 \\
-===== Configuration Register =====
-==== SYSCFG - EXTICRx ====
-=== EXTICR1 ===
-External interrupt configuration register 1
-\\ {{syscfg_reg_exticr1.svg}} \\ \\
-=== EXTICR2 ===
-External interrupt configuration register 2
-\\ {{syscfg_reg_exticr2.svg}} \\ \\
-=== EXTICR3 ===
-External interrupt configuration register 3
-\\ {{syscfg_reg_exticr3.svg}} \\ \\
-=== EXTICR4 ===
-External interrupt configuration register 4
-\\ {{syscfg_reg_exticr4.svg}} \\ \\
-|< 100% 5em 5em >|
-|EXTIx|0000|GPIOA pin x (reset state)|
-|:::|0001|GPIOB pin x|
-|:::|...|
-|:::|1010|GPIOK pin x|
-\\
-==== EXTI - RTSR / FTSR ====
-Rising / falling trigger selection register
-\\ {{exti_reg_xtsr.svg}} \\ \\
-|< 100% 5em 5em >|
-|TRx|0|Trigger for EXTI line x disabled (reset state)|
-|:::|1|Trigger for EXTI line x enabled|
-\\
-==== EXTI - IMR ====
-Interrupt mask register
-\\ {{exti_reg_imr.svg}} \\ \\
-|< 100% 5em 5em >|
-|MRx|0|Interrupt request for EXTI line x masked (reset state)|
-|:::|1|Interrupt request for EXTI line x unmasked|