add channel_set_duration() for timer based polls

include/main.h

@@ -24,6 +24,7 @@ bool channel_init(const char *fn);
 uint8_t channel_gpio_by_idx(int idx);
 uint8_t channel_idx_by_gpio(int gpio);
 void channel_set(int idx, bool state);
+void channel_set_duration(int idx, bool state, uint16_t seconds);
 bool channel_get(int idx);
 int channel_get_total();
 void channel_handler(int gpio, void *arg);

src/channel.c

@@ -144,6 +144,28 @@ uint8_t channel_idx_by_gpio(int gpio) {
   return GPIO_INVALID;
 }
 
+// Slightly tricky callback (installed on a timer by channel_set and
+// channel_toggle carries information in the arg pointer -- top 16 bits are
+// the channel idx, LSB is boolean value to set the channel to.
+static void channel_set_cb(void *arg) {
+  uint32_t input=(uint32_t) arg;
+  int idx = input>>16;
+  int value = input & 0x1;
+  LOG(LL_INFO, ("Channel callback for channel %d value %d", idx, value));
+  channel_set(idx, (bool)value);
+}
+
+void channel_set_duration(int idx, bool state, uint16_t seconds) {
+  uint32_t val;
+  channel_set(idx, state);
+
+  // Pass an argument to the channel_set_cb callback, top 16 bits is channel,
+  // bottom bit is what to set it to
+  val = idx<<16+(!state);
+  LOG(LL_INFO, ("Setting timer for %d seconds on channel %d with future value %d", seconds, idx, !state));
+  mgos_set_timer (1000 * seconds, false /* oneshot */, channel_set_cb, (void *)val);
+}
+
 void channel_set(int idx, bool state) {
   double now = mg_time();