Merge pull request #3 from mtusnio/master

joystick: example added

Author: francois-berder

examples/CMakeLists.txt

@@ -10,6 +10,10 @@ add_executable(letmecreate_test_relay2 relay2/main.c)
 target_link_libraries(letmecreate_test_relay2 letmecreate_click letmecreate_core)
 install(TARGETS letmecreate_test_relay2 RUNTIME DESTINATION bin)
 
+add_executable(letmecreate_test_joystick joystick/main.c)
+target_link_libraries(letmecreate_test_joystick letmecreate_click letmecreate_core)
+install(TARGETS letmecreate_test_joystick RUNTIME DESTINATION bin)
+
 add_executable(letmecreate_test_accel accel/main.c)
 target_link_libraries(letmecreate_test_accel letmecreate_click letmecreate_core)
 install(TARGETS letmecreate_test_accel RUNTIME DESTINATION bin)

examples/joystick/main.c

@@ -0,0 +1,54 @@
+#include <stdio.h>
+#include <core/common.h>
+#include <core/led.h>
+#include <core/i2c.h>
+#include <click/joystick.h>
+
+/*   Roughly the variable that will be reached when the joystick is farthest
+     left or right */
+#define OFFSET  98
+#define MAXIMUM (OFFSET * 2)
+
+/* We have 7 LEDs + the heartbeat LED which we skip */
+#define LED_CNT 7
+
+int get_led_mask(float perc)
+{
+    int mask = 0;
+    int div = perc * LED_CNT;
+    int i;
+    if (div > LED_CNT)
+        div = LED_CNT;
+
+    for (i = 0; i < div; i++)
+        mask |= (1 << i);
+
+    return mask;
+}
+
+int main()
+{
+    i2c_init();
+    i2c_select_bus(MIKROBUS_1);
+    led_init();
+
+    /* Use Ctrl-C to break the loop */
+    while (1) {
+        int8_t x, y;
+        int mask;
+
+        if (joystick_click_get_position(&x, &y) == -1)
+            break;
+
+        printf("%i %i\n", (int)x, (int)y);
+
+        mask = get_led_mask((float)(x + OFFSET)/(float)MAXIMUM);
+        led_switch_on(mask);
+        led_switch_off(~mask);
+    }
+
+    led_release();
+    i2c_release();
+
+    return 0;
+}