Peter Drescher / mbed-F401

mbed library with additional peripherals for ST F401 board

Fork of mbed-src by mbed official

This mbed LIB has additional peripherals for ST F401 board

  • UART2 : PA_3 rx, PA_2 tx
  • UART3 : PC_7 rx, PC_6 tx
  • I2C2 : PB_3 SDA, PB_10 SCL
  • I2C3 : PB_4 SDA, PA_8 SCL

Diff: targets/hal/TARGET_Freescale/TARGET_KL25Z/us_ticker.c

Revision:
74:847f030b50ee
Parent:
72:248c61396e08
--- a/targets/hal/TARGET_Freescale/TARGET_KL25Z/us_ticker.c	Tue Jan 14 20:45:05 2014 +0000
+++ b/targets/hal/TARGET_Freescale/TARGET_KL25Z/us_ticker.c	Tue Jan 14 22:15:04 2014 +0000
@@ -102,10 +102,22 @@
             }
         }
     }
-    //No suitable external oscillator clock -> Use fast internal oscillator (4MHz)
+    //No suitable external oscillator clock -> Use fast internal oscillator (4MHz / divider)
     MCG->C1 |= MCG_C1_IRCLKEN_MASK;
     MCG->C2 |= MCG_C2_IRCS_MASK;
-    LPTMR0->PSR = LPTMR_PSR_PCS(0) | LPTMR_PSR_PRESCALE(1);
+    LPTMR0->PSR =  LPTMR_PSR_PCS(0);
+    switch (MCG->SC & MCG_SC_FCRDIV_MASK) {
+        case MCG_SC_FCRDIV(0):                  //4MHz
+            LPTMR0->PSR |= LPTMR_PSR_PRESCALE(1);
+            break;
+        case MCG_SC_FCRDIV(1):                  //2MHz
+            LPTMR0->PSR |= LPTMR_PSR_PRESCALE(0);
+            break;
+        default:                                //1MHz or anything else, in which case we put it on 1MHz
+            MCG->SC &= ~MCG_SC_FCRDIV_MASK;
+            MCG->SC |= MCG_SC_FCRDIV(2);
+            LPTMR0->PSR |= LPTMR_PSR_PBYP_MASK;
+    }
     
 }