Atsushi Shinbo / Mbed 2 deprecated Attenuator_for_FN1242A

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Dependencies:   mbed

Diff: main.cpp

Revision:
1:a060fd2ee1aa
Parent:
0:3f8e97e08238
--- a/main.cpp	Sun Feb 02 03:24:55 2014 +0000
+++ b/main.cpp	Sun Feb 02 06:06:32 2014 +0000
@@ -63,19 +63,29 @@
     wait_us(10);                // us
     
     while (1) {
-        new_vol = pin_VR.read_u16() >> 6;
-        new_vol = new_vol | 0x3f;   // 6bit
+        new_vol = pin_VR.read_u16() >> 6;   // 10bit (0-1023)
+        
+        if (cur_vol <= new_vol - 8) {
+            new_vol = (new_vol - 8) | 0x3f;   // 6bit
+            
+        } else 
+        if (new_vol + 8 <= (cur_vol - 0x40)) {
+            new_vol = (new_vol + 8) | 0x3f;   // 6bit
+    
+        } else {
+            new_vol = cur_vol;
+        }
         
         if (new_vol != cur_vol) {
             cur_vol = new_vol;
             
             send_cmd(
-                (0 << 11)       // MODE0
+                  (0 << 11)     // MODE0
                 | (1 << 10)     // LDL
                 | new_vol);     // 10bit
             
             send_cmd(
-                (1 << 11)       // MODE1
+                  (1 << 11)     // MODE1
                 | (1 << 10)     // LDR
                 | new_vol);     // 10bit
         }