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doc(lab02): add doc for ex08

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This commit is contained in:
Rémi Heredero
2026-04-01 18:42:18 +02:00
parent 906954a035
commit 7a376ff789
2 changed files with 29 additions and 22 deletions
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16
doc/lab-01_02.typ
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@@ -371,6 +371,7 @@ registers[0] = ioremap(CHIP_ID_BASE_ADDR, 0x1000);
Easy exercice, a thread in the kernet is a `struct task_struct*` that can be created with `kthread_run`
#pagebreak()
//-------------------
// Exercise 7: Sleeping
//-------------------
@@ -402,9 +403,6 @@ a problem during the implementation, we cannot kill the code.
Interrupts
],
[
Develop a module which allows to detect every push on the button of the nanopi with interrupt. Every interrupts will send a message for debugging.
- Use the service ``` gpio_request(<io_nr>, <label>)```
@@ -416,6 +414,18 @@ a problem during the implementation, we cannot kill the code.
]
)
We made a custom structur for the gpio device that contain all useful information like the name and the id.
```c
struct gpio_nanopi {
int id;
char* name;
};
static struct gpio_nanopi switchK1 = {0, "K1: GPIOA.0"};
static struct gpio_nanopi switchK2 = {2, "K2: GPIOA.2"};
static struct gpio_nanopi switchK3 = {3, "K3: GPIOA.3"};
```
//-------------------------------------
// Glossary
//

35
src/01-skeleton/s02e08-interrupt.c
View File

@@ -6,17 +6,14 @@
#include <linux/gpio.h>
#include "linux/printk.h"
#define SWITCH_K1 0
#define SWITCH_K2 2
#define SWITCH_K3 3
struct gpio_nanopi {
int pin;
int id;
char* name;
};
static struct gpio_nanopi switchK1 = {0, "K1: GPIOA.0"};
static struct gpio_nanopi switchK2 = {0, "K2: GPIOA.2"};
static struct gpio_nanopi switchK3 = {0, "K3: GPIOA.3"};
static struct gpio_nanopi switchK2 = {2, "K2: GPIOA.2"};
static struct gpio_nanopi switchK3 = {3, "K3: GPIOA.3"};
irqreturn_t isrGPIO(int irq, void* gpio_struct) {
struct gpio_nanopi *gpio = (struct gpio_nanopi *)gpio_struct;
@@ -31,9 +28,9 @@ void interrupt_init(void) {
int status = 0;
// Switch k1
if (gpio_request(SWITCH_K1, switchK1.name) == 0) {
if (gpio_request(switchK1.id, switchK1.name) == 0) {
status = request_irq(
gpio_to_irq(SWITCH_K1),
gpio_to_irq(switchK1.id),
isrGPIO,
IRQF_TRIGGER_FALLING | IRQF_SHARED,
switchK1.name,
@@ -42,9 +39,9 @@ void interrupt_init(void) {
}
// Switch k2
if (gpio_request(SWITCH_K2, switchK2.name) == 0) {
if (gpio_request(switchK2.id, switchK2.name) == 0) {
status = request_irq(
gpio_to_irq(SWITCH_K2),
gpio_to_irq(switchK2.id),
isrGPIO,
IRQF_TRIGGER_FALLING | IRQF_SHARED,
switchK2.name,
@@ -53,9 +50,9 @@ void interrupt_init(void) {
}
// Switch k3
if (gpio_request(SWITCH_K3, switchK3.name) == 0) {
if (gpio_request(switchK3.id, switchK3.name) == 0) {
status = request_irq(
gpio_to_irq(SWITCH_K3),
gpio_to_irq(switchK3.id),
isrGPIO,
IRQF_TRIGGER_FALLING | IRQF_SHARED,
switchK3.name,
@@ -69,14 +66,14 @@ void interrupt_init(void) {
void interrupt_exit(void) {
pr_info("Exiting interrupts\n");
gpio_free(SWITCH_K1);
free_irq(gpio_to_irq(SWITCH_K1), &switchK1);
gpio_free(switchK1.id);
free_irq(gpio_to_irq(switchK1.id), &switchK1);
gpio_free(SWITCH_K2);
free_irq(gpio_to_irq(SWITCH_K2), &switchK2);
gpio_free(switchK2.id);
free_irq(gpio_to_irq(switchK2.id), &switchK2);
gpio_free(SWITCH_K3);
free_irq(gpio_to_irq(SWITCH_K3), &switchK3);
gpio_free(switchK3.id);
free_irq(gpio_to_irq(switchK3.id), &switchK3);
pr_info ("Interrupt exited\n");