Thanks to Zoltan Hudak publish the way to use STM32F103c8t6 on mbed. Now, this example can let you use it with a encoder.

Dependencies:   QEI mbed-STM32F103C8T6 mbed

Fork of STM32F103C8T6_Hello by Zoltan Hudak

Revision:
4:a81f44fc487e
Parent:
3:c6a589f444b9
Child:
5:3c3ef17a17a6
--- a/main.cpp	Sat Jul 02 07:51:56 2016 +0000
+++ b/main.cpp	Sat Jul 02 08:25:56 2016 +0000
@@ -5,7 +5,7 @@
 
 int main() {
     while(1) {
-        // The on-board LED is connected to pin PC_13 and, via a resistor, to +3V3. 
+        // The on-board LED is connected, via a resistor, to +3.3V (instead of GND). 
         // So to turn the LED on or off we have to set it to 0 or 1 respectively
         myled = 0; // turn the LED on
         wait(0.2); // 200 ms