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feat(lab03): add buttons case

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This commit is contained in:
fastium
2026-04-24 16:10:05 +02:00
parent 1221757fae
commit 110ebe0d70
1 changed files with 14 additions and 15 deletions
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29
src/03-led-controller/main.c
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@@ -42,7 +42,6 @@ void* btn_thread(void* arg) {
btn[i] = open_btn(GPIO_BTN[i], BTN[i]);
if (btn[i] < 0) {
perror("Failed to open button");
return 1;
}
}
@@ -50,7 +49,6 @@ void* btn_thread(void* arg) {
int epfd = epoll_create1(0);
if (epfd < 0) {
perror("Failed to create epoll");
return 1;
}
// Add buttons to epoll
@@ -63,7 +61,6 @@ void* btn_thread(void* arg) {
ev[i].data.fd = btn[i];
if (epoll_ctl(epfd, EPOLL_CTL_ADD, btn[i], &ev[i]) < 0) {
perror("Failed to add button to epoll");
return 1;
}
}
@@ -88,20 +85,22 @@ void* btn_thread(void* arg) {
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < NBR_BTN; j++) {
if (events[i].data.fd == btn[j]) {
// Read the new value. pread uses offset 0 so we don't need lseek()
pread(btn[j], buf, sizeof(buf), 0);
// Print the result. '1' or '0' depends on your hardware pull-up/down resistors
if (buf[0] == '1') {
printf("Button %d State: HIGH (1)\n", j+1);
} else {
printf("Button %d State: LOW (0)\n", j+1);
}
// read btn file
pread(btn[i], buf, sizeof(buf), 0);
if (events[i].data.fd == btn[0]) {
if (buf[0] == '1') {
printf("Decrease led frequency");
}
} else if (events[i].data.fd == btn[1]) {
if (buf[0] == '1') {
printf("Reset led frequency");
}
} else if (events[i].data.fd == btn[2]) {
if (buf[0] == '1') {
printf("Increase led frequency");
}
}
}
}