Added solutions for many of the first exercises

1 files changed, 47 insertions, 0 deletions

diff --git a/sem4/embedded/m1/router/router.ino b/sem4/embedded/m1/router/router.ino
new file mode 100644
index 0000000..ba0b375
--- /dev/null
+++ b/sem4/embedded/m1/router/router.ino
@@ -0,0 +1,47 @@
+#define LEDPIN 13
+
+int task1(void) {
+    static bool state = 0;
+
+    digitalWrite(LEDPIN, state);
+    state = !state;
+    return 0;
+}
+
+int task2(void) {
+    Serial.print("l");
+    return 0;
+}
+int task3(void) {
+    Serial.print("h");
+    return 0;
+}
+
+int runevery(int (*f)(), unsigned long *last, unsigned long period) {
+    unsigned long now = millis();
+    if (*last + period > now) {
+        return -1;
+    }
+
+    *last = now;
+    return (*f)();
+}
+
+
+#define TASKS 3
+unsigned long lasts[TASKS];
+
+void setup() {
+    Serial.begin(115200);
+    pinMode(LEDPIN, OUTPUT);
+    for (int i = 0; i < TASKS; i++) {
+        lasts[i] = 0;
+    }
+}
+
+void loop() {
+    unsigned i = 0;
+    runevery(task1, &lasts[i++], 1000);
+    runevery(task2, &lasts[i++], 100);
+    runevery(task3, &lasts[i++], 10);
+}