Piyamate Wisanuvej / mbed-src-overclock

modified mbed-src to overclock K64F MCU to run at 128.125MHz, for running the UART at 8Mbps, call SystemCoreClockUpdate() at the beginning of your code to re-calculate the SystemCoreClock

Fork of mbed-src by mbed official

Files at this revision

API Documentation at this revision

Revision 246:15713155d815, committed 2014-07-01

Comitter:
piyamate
Date:
Tue Jul 01 00:03:52 2014 +0000
Parent:
245:b4dea936db71
Commit message:
Overclock K64F to 128.125MHz

Changed in this revision

targets/cmsis/TARGET_Freescale/TARGET_K64F/system_MK64F12.c Show annotated file Show diff for this revision Revisions of this file 
--- a/targets/cmsis/TARGET_Freescale/TARGET_K64F/system_MK64F12.c	Mon Jun 30 08:00:09 2014 +0100
+++ b/targets/cmsis/TARGET_Freescale/TARGET_K64F/system_MK64F12.c	Tue Jul 01 00:03:52 2014 +0000
@@ -115,6 +115,9 @@
     #define DEFAULT_SYSTEM_CLOCK            120000000u /* Default System clock value */
 #endif /* (CLOCK_SETUP == 4) */
 
+#define OVERCLOCK 1
+#define PRDIV0 0x0F //Device Factor = 16
+#define VDIV0  0x11 //Multiply Factor = 41
 
 /* ----------------------------------------------------------------------------
    -- Core clock
@@ -213,16 +216,28 @@
   /* MCG->C4: DMX32=0,DRST_DRS=0 */
   MCG->C4 &= (uint8_t)~(uint8_t)((MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS(0x03)));
   /* MCG->C5: ?=0,PLLCLKEN0=0,PLLSTEN0=0,PRDIV0=0x13 */
+#if (!OVERCLOCK)
   MCG->C5 = MCG_C5_PRDIV0(0x13);
+#else
+  MCG->C5 = MCG_C5_PRDIV0(PRDIV0);
+#endif
   /* MCG->C6: LOLIE0=0,PLLS=0,CME0=0,VDIV0=0x18 */
+#if (!OVERCLOCK)
   MCG->C6 = MCG_C6_VDIV0(0x18);
+#else
+  MCG->C6 = MCG_C6_VDIV0(VDIV0);
+#endif
   while((MCG->S & MCG_S_IREFST_MASK) != 0x00U) { /* Check that the source of the FLL reference clock is the external reference clock. */
   }
   while((MCG->S & 0x0CU) != 0x08U) {    /* Wait until external reference clock is selected as MCG output */
   }
   /* Switch to PBE Mode */
   /* MCG->C6: LOLIE0=0,PLLS=1,CME0=0,VDIV0=0x18 */
+#if (!OVERCLOCK)
   MCG->C6 = (MCG_C6_PLLS_MASK | MCG_C6_VDIV0(0x18));
+#else
+  MCG->C6 = (MCG_C6_PLLS_MASK | MCG_C6_VDIV0(VDIV0));
+#endif
   while((MCG->S & 0x0CU) != 0x08U) {    /* Wait until external reference clock is selected as MCG output */
   }
   while((MCG->S & MCG_S_LOCK0_MASK) == 0x00U) { /* Wait until locked */