RPi 4 GPIO 中断上升和下降触发器在 C 中不起作用
RPi 4 GPIO Interrupt on Rising and Falling trigger not working in C
初学者在这里学习编写 linux 内核模块。
我想用 C 语言为我的树莓派 4 编写一个内核模块。
我想在按下按钮时使用中断点亮 LED。只要按下按钮，LED 就会亮起，当我松开按钮时，LED 应该会熄灭。
我使用函数 request_irq() 以便通过指示“IRQF_TRIGGER_FALLING | [=37= 在按钮的上升沿和下降沿调用处理中断的函数]”。我以前使用函数 gpio_to_irq(BUTTON_PIN).
request_irq(button_irq, button_ih, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "button_irq", NULL);
当我按下按钮时调用该函数，但当我释放它时不调用该函数。它的编码如下所示：
static irqreturn_t button_ih(int irq, void *data)
{
int state;
state = gpio_get_value(BUTTON_PIN);
printk(KERN_INFO "Actual state of the button : %d", state);
//Debounce condition
if(jiffies - last_interrupt_time > msecs_to_jiffies(200))
{
if(state)
{
gpio_set_value(LED_PIN, 1);
}else
{
gpio_set_value(LED_PIN, 0);
}
}
last_interrupt_time = jiffies;
return IRQ_HANDLED;
}
我检查按钮的值是 1（按下）还是 0（松开），并想相应地打开 on/off LED。
当我尝试不同的 GPIO 时，有时我的按钮的值是 1，即使我还没有按下它（通过从 init 函数打印消息）有时它是 0。所以我不明白如果我做错了什么。我认为 GPIO 尚未使用，因为我可以使用函数 gpio_request_one().
请求它们
因此当按钮已经具有值 1 时，当我释放按钮时 LED 亮起但不会关闭。
并且当值已经是0时，当我进入中断处理函数时按钮值并没有变成1（而且LED显然没有亮）。
你能告诉我它有什么问题吗？
形成简单的C程序，不是内核模块
这个最少看看我是怎么做的。
main.h
typedef struct s_Data {
int exitFlag;
struct {int value; int bcmPin;} In01; //<--- Stock actual GPIO Value
struct {int value; int bcmPin;} In02;
....
struct {int value; int bcmPin;} Out01;
struct {int value; int bcmPin;} Out02;
....
} t_Data;
#define NO_Click 0
#define SimpleClick 1
#define LongClick 2
#define MultiClick 3
typedef struct s_Button {
pthread_t button_thread;
int *exitFlag;
int * input; //Button
int * output;
int old_state;
int new_state;
struct timeval t0;
struct timeval t1;
struct timeval pressedTime;
struct timeval releasedTime;
int clickType;
//float debounce = 0.020; // ms debounce period to prevent flickering when pressing or releasing the button
// debounce not necessary while thread have time to take a coffee
float DCgap; // max ms between clicks for a double click event
float holdTime; // ms hold period: how long to wait for press+hold event
} t_Button;
main.c
#include "main.h"
#include <wiringPi.h>
#include <pthread.h>
// initial state
static t_Data data = {
.exitFlag = 0,
.In01.value = 0, .In01.bcmPin = 4,
.In02.value = 0, .In02.bcmPin = 17,
.Out01.value = 0, .Out01.bcmPin = 4,
.Out02.value = 0, .Out02.bcmPin = 17,
}
static _Data data_prev;
static void *inputRead_threadFn(void *p_Data) {
pinMode(Data.In01.bcmPin, INPUT);
pullUpDnControl(Data.In01.bcmPin, PUD_UP);
pinMode(Data.In02.bcmPin, INPUT);
pullUpDnControl(Data.In02.bcmPin, PUD_UP);
while (!Data.exitFlag) {
Data.In01.value = !digitalRead(Data.In01.bcmPin);
Data.In02.value = !digitalRead(Data.In02.bcmPin);
if (Data.In01.value != Data_old.In01.value) {
Data_old.In01.value = Data.In01.value;
}
if (Data.In02.value != Data_old.In02.value) {
Data_old.In02.value = Data.In02.value;
}
usleep(50)
}
}
static void *outputWrite_threadFn(void *p_Data) {
pinMode(Data.In01.bcmPin, OUTPUT);
pinMode(Data.In02.bcmPin, OUTPUT);
while (!Data.exitFlag) {
digitalWrite(Data.Out01.bcmPin, !Data.Out01.value);
digitalWrite(Data.Out02.bcmPin, !Data.Out02.value);
}
usleep(50)
}
static void *button_threadFn(void *p_Data) {
t_Button *button = (t_Button *)p_data;
LOG("Button[%s] thread initialized\r\n", button->name);
button->old_state = 0;
button->new_state = 0;
button->clickType = NO_Click;
int clickCount = 0;
while(*(button->exitFlag) == 0) {
button->new_state = *(button->input) || *(button->web_input); //*((int *)
if( button->old_state == 0 && button->new_state == 1 ) {
//printf("front montant\r\n"); fflush(stdout);
// *****************************
// traitement sur front montant
// rising edge
// *****************************
button->old_state = 1;
gettimeofday(&button->pressedTime, 0);
//Button pressed
} else if( (button->old_state == 1) && (button->new_state == 0) ) {
//printf("front descendant\r\n"); fflush(stdout);
// *****************************
// traitement sur front descendant
// falling edge
// *****************************
button->old_state = 0;
gettimeofday(&button->releasedTime, 0);
if (my_timedifference_msec(button->releasedTime, button->pressedTime ) < button->DCgap) {
clickCount++;
button->clickType = MultiClick;
}
//Button released
} else if( (button->old_state == 0) && (button->new_state == 0) ) {
// printf("front bas\r\n"); fflush(stdout);
// *****************************
// pas de changement d'état : front bas
// no state change : edge down
// *****************************
gettimeofday(&button->t0, 0);
*(button->output) = 0; //<--- here in your case
//Attendre DC_Gap pour connaitre le nombre de click
// Wait for DC_Gap to know click count
if (my_timedifference_msec(button->t0, button->releasedTime) > button->DCgap) {
if (clickCount == 1) {
LOG("SimpleClick");
//Simple Click
} else if ( clickCount > 1 ) {
//Multiclicks
}
button->clickType = NO_Click;
clickCount = 0;
}
} else if( (button->old_state == 1) && (button->new_state == 1) ) {
// printf("front haut\r\n"); fflush(stdout);
// *****************************
// pas de changement d'état : front haut
// no state change : edge up
// *****************************
gettimeofday(&button->t1, 0);
*(button->output) = 1; //<--- here in your case
//long click
if (my_timedifference_msec(button->t1, button->pressedTime) >= button->holdTime) {
LOG("LongClick");
button->clickType = LongClick;
//do what you want while not released
usleep(30*1000);
}
}
usleep(100);
}
printf("Light Loop::exiting...\r\n"); fflush(stdout);
}
int main(int argc, char** argv) {
wiringPiSetup();
wiringPiSetupGpio();
data_prev = data;
//start input thread
//start output thread
int DCGap = 250; //ms
int HoldTime = 600;
t_Button Buttons[] = {
{ //WC
.exitFlag = &Data.exitFlag,
.DCgap = DCGap,
.holdTime = HoldTime,
.input = &Data.In01.value,
.output = &Data.Out01.value,
},
{ //chambre
.exitFlag = &Data.exitFlag,
.DCgap = DCGap,
.holdTime = HoldTime,
.input = &Data.In02.value,
.output= &Data.Out02.value,
}
}
//start buttons threads
for (i = 0; i < (sizeof(Buttons) / sizeof(t_Button)) ; i++) {
ret = pthread_create (&Buttons[i].button_threadFn, NULL, fn_Button, &Buttons[i]);
if (ret) {
fprintf (stderr, "%s", strerror (ret));
}
}
//threads join
return (EXIT_SUCCESS);
}
好的，谢谢大家 comments/answers。
确实是因为我没有正确使用任何 pull-up 或 pull-down 电阻。
所以我改变了我的电路如下：
Circuit
初学者在这里学习编写 linux 内核模块。
我想用 C 语言为我的树莓派 4 编写一个内核模块。
我想在按下按钮时使用中断点亮 LED。只要按下按钮，LED 就会亮起，当我松开按钮时，LED 应该会熄灭。
我使用函数 request_irq() 以便通过指示“IRQF_TRIGGER_FALLING | [=37= 在按钮的上升沿和下降沿调用处理中断的函数]”。我以前使用函数 gpio_to_irq(BUTTON_PIN).
request_irq(button_irq, button_ih, IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING, "button_irq", NULL);
当我按下按钮时调用该函数，但当我释放它时不调用该函数。它的编码如下所示：
static irqreturn_t button_ih(int irq, void *data)
{
int state;
state = gpio_get_value(BUTTON_PIN);
printk(KERN_INFO "Actual state of the button : %d", state);
//Debounce condition
if(jiffies - last_interrupt_time > msecs_to_jiffies(200))
{
if(state)
{
gpio_set_value(LED_PIN, 1);
}else
{
gpio_set_value(LED_PIN, 0);
}
}
last_interrupt_time = jiffies;
return IRQ_HANDLED;
}
我检查按钮的值是 1（按下）还是 0（松开），并想相应地打开 on/off LED。
当我尝试不同的 GPIO 时，有时我的按钮的值是 1，即使我还没有按下它（通过从 init 函数打印消息）有时它是 0。所以我不明白如果我做错了什么。我认为 GPIO 尚未使用，因为我可以使用函数 gpio_request_one().
请求它们因此当按钮已经具有值 1 时，当我释放按钮时 LED 亮起但不会关闭。
并且当值已经是0时，当我进入中断处理函数时按钮值并没有变成1（而且LED显然没有亮）。
你能告诉我它有什么问题吗？
形成简单的C程序，不是内核模块 这个最少看看我是怎么做的。 main.h
typedef struct s_Data {
int exitFlag;
struct {int value; int bcmPin;} In01; //<--- Stock actual GPIO Value
struct {int value; int bcmPin;} In02;
....
struct {int value; int bcmPin;} Out01;
struct {int value; int bcmPin;} Out02;
....
} t_Data;
#define NO_Click 0
#define SimpleClick 1
#define LongClick 2
#define MultiClick 3
typedef struct s_Button {
pthread_t button_thread;
int *exitFlag;
int * input; //Button
int * output;
int old_state;
int new_state;
struct timeval t0;
struct timeval t1;
struct timeval pressedTime;
struct timeval releasedTime;
int clickType;
//float debounce = 0.020; // ms debounce period to prevent flickering when pressing or releasing the button
// debounce not necessary while thread have time to take a coffee
float DCgap; // max ms between clicks for a double click event
float holdTime; // ms hold period: how long to wait for press+hold event
} t_Button;
main.c
#include "main.h"
#include <wiringPi.h>
#include <pthread.h>
// initial state
static t_Data data = {
.exitFlag = 0,
.In01.value = 0, .In01.bcmPin = 4,
.In02.value = 0, .In02.bcmPin = 17,
.Out01.value = 0, .Out01.bcmPin = 4,
.Out02.value = 0, .Out02.bcmPin = 17,
}
static _Data data_prev;
static void *inputRead_threadFn(void *p_Data) {
pinMode(Data.In01.bcmPin, INPUT);
pullUpDnControl(Data.In01.bcmPin, PUD_UP);
pinMode(Data.In02.bcmPin, INPUT);
pullUpDnControl(Data.In02.bcmPin, PUD_UP);
while (!Data.exitFlag) {
Data.In01.value = !digitalRead(Data.In01.bcmPin);
Data.In02.value = !digitalRead(Data.In02.bcmPin);
if (Data.In01.value != Data_old.In01.value) {
Data_old.In01.value = Data.In01.value;
}
if (Data.In02.value != Data_old.In02.value) {
Data_old.In02.value = Data.In02.value;
}
usleep(50)
}
}
static void *outputWrite_threadFn(void *p_Data) {
pinMode(Data.In01.bcmPin, OUTPUT);
pinMode(Data.In02.bcmPin, OUTPUT);
while (!Data.exitFlag) {
digitalWrite(Data.Out01.bcmPin, !Data.Out01.value);
digitalWrite(Data.Out02.bcmPin, !Data.Out02.value);
}
usleep(50)
}
static void *button_threadFn(void *p_Data) {
t_Button *button = (t_Button *)p_data;
LOG("Button[%s] thread initialized\r\n", button->name);
button->old_state = 0;
button->new_state = 0;
button->clickType = NO_Click;
int clickCount = 0;
while(*(button->exitFlag) == 0) {
button->new_state = *(button->input) || *(button->web_input); //*((int *)
if( button->old_state == 0 && button->new_state == 1 ) {
//printf("front montant\r\n"); fflush(stdout);
// *****************************
// traitement sur front montant
// rising edge
// *****************************
button->old_state = 1;
gettimeofday(&button->pressedTime, 0);
//Button pressed
} else if( (button->old_state == 1) && (button->new_state == 0) ) {
//printf("front descendant\r\n"); fflush(stdout);
// *****************************
// traitement sur front descendant
// falling edge
// *****************************
button->old_state = 0;
gettimeofday(&button->releasedTime, 0);
if (my_timedifference_msec(button->releasedTime, button->pressedTime ) < button->DCgap) {
clickCount++;
button->clickType = MultiClick;
}
//Button released
} else if( (button->old_state == 0) && (button->new_state == 0) ) {
// printf("front bas\r\n"); fflush(stdout);
// *****************************
// pas de changement d'état : front bas
// no state change : edge down
// *****************************
gettimeofday(&button->t0, 0);
*(button->output) = 0; //<--- here in your case
//Attendre DC_Gap pour connaitre le nombre de click
// Wait for DC_Gap to know click count
if (my_timedifference_msec(button->t0, button->releasedTime) > button->DCgap) {
if (clickCount == 1) {
LOG("SimpleClick");
//Simple Click
} else if ( clickCount > 1 ) {
//Multiclicks
}
button->clickType = NO_Click;
clickCount = 0;
}
} else if( (button->old_state == 1) && (button->new_state == 1) ) {
// printf("front haut\r\n"); fflush(stdout);
// *****************************
// pas de changement d'état : front haut
// no state change : edge up
// *****************************
gettimeofday(&button->t1, 0);
*(button->output) = 1; //<--- here in your case
//long click
if (my_timedifference_msec(button->t1, button->pressedTime) >= button->holdTime) {
LOG("LongClick");
button->clickType = LongClick;
//do what you want while not released
usleep(30*1000);
}
}
usleep(100);
}
printf("Light Loop::exiting...\r\n"); fflush(stdout);
}
int main(int argc, char** argv) {
wiringPiSetup();
wiringPiSetupGpio();
data_prev = data;
//start input thread
//start output thread
int DCGap = 250; //ms
int HoldTime = 600;
t_Button Buttons[] = {
{ //WC
.exitFlag = &Data.exitFlag,
.DCgap = DCGap,
.holdTime = HoldTime,
.input = &Data.In01.value,
.output = &Data.Out01.value,
},
{ //chambre
.exitFlag = &Data.exitFlag,
.DCgap = DCGap,
.holdTime = HoldTime,
.input = &Data.In02.value,
.output= &Data.Out02.value,
}
}
//start buttons threads
for (i = 0; i < (sizeof(Buttons) / sizeof(t_Button)) ; i++) {
ret = pthread_create (&Buttons[i].button_threadFn, NULL, fn_Button, &Buttons[i]);
if (ret) {
fprintf (stderr, "%s", strerror (ret));
}
}
//threads join
return (EXIT_SUCCESS);
}
好的，谢谢大家 comments/answers。
确实是因为我没有正确使用任何 pull-up 或 pull-down 电阻。
所以我改变了我的电路如下： Circuit