Ned Konz / billy_bass

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Dependencies:   mbed

Diff: FastAnalogIn.h

Revision:
3:c04d8d0493f4
Parent:
2:5bcd2f55a294
diff -r 5bcd2f55a294 -r c04d8d0493f4 FastAnalogIn.h
--- a/FastAnalogIn.h	Tue May 14 17:19:45 2013 +0000
+++ b/FastAnalogIn.h	Wed May 15 15:32:34 2013 +0000
@@ -30,13 +30,16 @@
     }
 
     uint16_t read_u16_nowait() {
-        // Return value
         return (uint16_t)ADC0->R[0];
     }
 
-    uint8_t read_u8_nowait() {
-        // Return value
-        return (uint8_t)ADC0->R[0];
+    // 0x0000 => 0x80 (-128)
+    // 0x7fff => 0xFF (-1)
+    // 0x8000 => 0x00 (0)
+    // 0xffff => 0x7f (127)
+    int8_t read_s8_nowait() {
+        int32_t val = read_u16_nowait();
+        return (val + 0x80 - 0x8000) >> 8;
     }
 
     FastAnalogIn(PinName pin)