Using HSE as the PLL_CLKSOURCE. Using PLL as the SYS_CLKSOURCE. Using extrenal 8MHz crystal.

Dependencies:   mbed

Revision:
0:9096775ac85a
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Nov 17 09:19:19 2017 +0000
@@ -0,0 +1,26 @@
+#include "mbed.h"
+#include "HSE_Config.h"
+
+DigitalOut tstPin(PB_8);
+DigitalOut tstLED(LED1);
+Ticker     timer;
+
+void out_sig()
+{
+    tstPin = !tstPin;    
+}
+
+int main() 
+{    
+    uint8_t config_res = HSE_Config();
+    
+    timer.attach_us(&out_sig,50);
+    printf("Hello World!\r\n");
+    while(1)
+    {
+        tstLED = !tstLED;
+        printf("%s\r\n",(config_res?"Success!":"Fail!"));
+        
+        wait(1);
+    }
+}