Add the blink utility function from mgos_gpio

include/mgos_pcf857x.h

@@ -18,13 +18,16 @@
 #include "mgos.h"
 #include "mgos_gpio.h"
 #include "mgos_i2c.h"
+#include "mgos_timers.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 struct mgos_pcf857x;
 
+struct mgos_pcf857x_gpio_blink_state;
+
 /*
  * Initialize a PCF857X on the I2C bus `i2c` at address specified in `i2caddr`
  * parameter (default PCF857X is on address 0x20). The device will be polled for
@@ -63,6 +66,14 @@ void mgos_pcf857x_gpio_clear_int(struct mgos_pcf857x *dev, int pin);
 void mgos_pcf857x_gpio_remove_int_handler(struct mgos_pcf857x *dev, int pin, mgos_gpio_int_handler_f *old_cb, void **old_arg);
 bool mgos_pcf857x_gpio_set_button_handler(struct mgos_pcf857x *dev, int pin, enum mgos_gpio_pull_type pull_type, enum mgos_gpio_int_mode int_mode, int debounce_ms, mgos_gpio_int_handler_f cb, void *arg);
 
+/*
+ * A utility function that takes care of blinking an LED.
+ * The pin must be configured as output first.
+ * Set to (0, 0) to disable.
+ */
+bool mgos_pcf857x_gpio_blink(struct mgos_pcf857x *dev, int pin, int on_ms, int off_ms);
+void mgos_pcf857x_gpio_blink_cb(void *arg);
+
 #ifdef __cplusplus
 }
 #endif

src/mgos_pcf857x.c

@@ -13,9 +13,29 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-
+#include <stdio.h>
 #include "mgos_pcf857x_internal.h"
 
+#define LD(fmt, ...) LOG(LL_DEBUG, ("[BLINK STATE] " fmt, ##__VA_ARGS__))
+
+static struct mgos_pcf857x_gpio_blink_state **blink_states = NULL;
+
+struct mgos_pcf857x_gpio_blink_state *mgos_pcf857x_get_or_create_blink_state(struct mgos_pcf857x *dev, int pin) {
+  if (blink_states == NULL) {
+    blink_states = calloc(dev->num_gpios, sizeof(struct mgos_pcf857x_gpio_blink_state *));
+    LD("Init %d pin", dev->num_gpios);
+  }
+
+  if (blink_states[pin] == NULL) {
+    blink_states[pin] = calloc(1, sizeof(struct mgos_pcf857x_gpio_blink_state));
+    blink_states[pin]->dev = dev;
+    blink_states[pin]->pin = pin;
+    blink_states[pin]->blink.timer_id = MGOS_INVALID_TIMER_ID;
+  }
+
+  return blink_states[pin];
+}
+
 void mgos_pcf857x_print_state(struct mgos_pcf857x *dev) {
   uint8_t n;
   char    s[17], i[17];
@@ -352,6 +372,45 @@ bool mgos_pcf857x_gpio_set_button_handler(struct mgos_pcf857x *dev, int pin, enu
   (void)pull_type;
 }
 
+void mgos_pcf857x_gpio_blink_cb(void *arg) {
+  struct mgos_pcf857x_gpio_blink_state *bs = (struct mgos_pcf857x_gpio_blink_state *)arg;
+
+  if (bs != NULL) {
+    bool curr = mgos_pcf857x_gpio_toggle(bs->dev, bs->pin);
+    if (bs->blink.on_ms != bs->blink.off_ms) {
+      int timeout = (curr ? bs->blink.on_ms : bs->blink.off_ms);
+      bs->blink.timer_id = mgos_set_timer(timeout, 0, mgos_pcf857x_gpio_blink_cb, bs);
+    }
+  }
+}
+
+bool mgos_pcf857x_gpio_blink(struct mgos_pcf857x *dev, int pin, int on_ms, int off_ms) {
+  bool res = !(!dev || on_ms < 0 || off_ms < 0 || on_ms >= 65536 || off_ms >= 65536);
+  if (res) {
+    struct mgos_pcf857x_gpio_blink_state *bs = mgos_pcf857x_get_or_create_blink_state(dev, pin);
+    if (bs != NULL) {
+
+      bs->blink.on_ms = on_ms;
+      bs->blink.off_ms = off_ms;
+
+      if (bs->blink.timer_id != MGOS_INVALID_TIMER_ID) {
+        mgos_clear_timer(bs->blink.timer_id);
+        bs->blink.timer_id = MGOS_INVALID_TIMER_ID;
+        LD("Clear timer for PIN-%d", bs->pin);
+      }
+      if (on_ms != 0 && off_ms != 0) {
+        bs->blink.timer_id = mgos_set_timer(
+            on_ms,
+            (on_ms == off_ms ? MGOS_TIMER_REPEAT : 0) | MGOS_TIMER_RUN_NOW,
+            mgos_pcf857x_gpio_blink_cb, bs);
+        res = (bs->blink.timer_id != MGOS_INVALID_TIMER_ID);
+        LD("Set timer for PIN-%d (on=%dms, off=%dms)", bs->pin, bs->blink.on_ms, bs->blink.off_ms);
+      }
+    }
+  }
+  return res;
+}
+
 // Mongoose OS library initialization
 bool mgos_pcf857x_i2c_init(void) {
   return true;

src/mgos_pcf857x_internal.h

@@ -46,6 +46,16 @@ struct mgos_pcf857x {
   struct mgos_pcf857x_cb cb[16];
 };
 
+struct mgos_pcf857x_gpio_blink_state {
+  int pin;
+  struct mgos_pcf857x *dev;
+  struct {
+    unsigned int on_ms;
+    unsigned int off_ms;
+    mgos_timer_id timer_id;
+  } blink;
+};
+
 /* Mongoose OS initializer */
 bool mgos_pcf857x_i2c_init(void);