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Superseded

This library was superseded by mbed-dev - https://os.mbed.com/users/mbed_official/code/mbed-dev/.

Development branch of the mbed library sources. This library is kept in synch with the latest changes from the mbed SDK and it is not guaranteed to work.

If you are looking for a stable and tested release, please import one of the official mbed library releases:

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_Freescale/TARGET_KLXX/clk_freqs.h@111:ae4891ca7084, 2014-03-06 (annotated)

Committer:
mbed_official
Date:
Thu Mar 06 10:00:06 2014 +0000
Revision:
111:ae4891ca7084
Parent:
82:0b31dbcd4769
Child:
363:12a245e5c745
Synchronized with git revision 955bd9a5c9e042f1cf30bbae2a99afaab8eb4cbf



Full URL: https://github.com/mbedmicro/mbed/commit/955bd9a5c9e042f1cf30bbae2a99afaab8eb4cbf/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 82:0b31dbcd4769 1 /* mbed Microcontroller Library
mbed_official 82:0b31dbcd4769 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 82:0b31dbcd4769 3 *
mbed_official 82:0b31dbcd4769 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 82:0b31dbcd4769 5 * you may not use this file except in compliance with the License.
mbed_official 82:0b31dbcd4769 6 * You may obtain a copy of the License at
mbed_official 82:0b31dbcd4769 7 *
mbed_official 82:0b31dbcd4769 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 82:0b31dbcd4769 9 *
mbed_official 82:0b31dbcd4769 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 82:0b31dbcd4769 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 82:0b31dbcd4769 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 82:0b31dbcd4769 13 * See the License for the specific language governing permissions and
mbed_official 82:0b31dbcd4769 14 * limitations under the License.
mbed_official 82:0b31dbcd4769 15 */
mbed_official 82:0b31dbcd4769 16 #ifndef MBED_CLK_FREQS_H
mbed_official 82:0b31dbcd4769 17 #define MBED_CLK_FREQS_H
mbed_official 82:0b31dbcd4769 18
mbed_official 82:0b31dbcd4769 19 #ifdef __cplusplus
mbed_official 82:0b31dbcd4769 20 extern "C" {
mbed_official 82:0b31dbcd4769 21 #endif
mbed_official 82:0b31dbcd4769 22
mbed_official 82:0b31dbcd4769 23 #include "PeripheralPins.h"
mbed_official 82:0b31dbcd4769 24
mbed_official 82:0b31dbcd4769 25 //Get the peripheral bus clock frequency
mbed_official 82:0b31dbcd4769 26 static inline uint32_t bus_frequency(void) {
mbed_official 82:0b31dbcd4769 27 return SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1);
mbed_official 82:0b31dbcd4769 28 }
mbed_official 82:0b31dbcd4769 29
mbed_official 82:0b31dbcd4769 30 //Get external oscillator (crystal) frequency
mbed_official 82:0b31dbcd4769 31 static uint32_t extosc_frequency(void) {
mbed_official 82:0b31dbcd4769 32 uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
mbed_official 82:0b31dbcd4769 33
mbed_official 82:0b31dbcd4769 34 if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(2)) //MCG clock = external reference clock
mbed_official 82:0b31dbcd4769 35 return MCGClock;
mbed_official 82:0b31dbcd4769 36
mbed_official 82:0b31dbcd4769 37 uint32_t divider, multiplier;
mbed_official 82:0b31dbcd4769 38 #ifdef MCG_C5_PLLCLKEN0_MASK //PLL available
mbed_official 82:0b31dbcd4769 39 if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(0)) { //PLL/FLL is selected
mbed_official 82:0b31dbcd4769 40 if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
mbed_official 82:0b31dbcd4769 41 #endif
mbed_official 82:0b31dbcd4769 42 if ((MCG->S & MCG_S_IREFST_MASK) == 0x0u) { //FLL uses external reference
mbed_official 82:0b31dbcd4769 43 divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
mbed_official 82:0b31dbcd4769 44 if ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u)
mbed_official 82:0b31dbcd4769 45 divider <<= 5u;
mbed_official 82:0b31dbcd4769 46 /* Select correct multiplier to calculate the MCG output clock */
mbed_official 82:0b31dbcd4769 47 switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
mbed_official 82:0b31dbcd4769 48 case 0x0u:
mbed_official 82:0b31dbcd4769 49 multiplier = 640u;
mbed_official 82:0b31dbcd4769 50 break;
mbed_official 82:0b31dbcd4769 51 case 0x20u:
mbed_official 82:0b31dbcd4769 52 multiplier = 1280u;
mbed_official 82:0b31dbcd4769 53 break;
mbed_official 82:0b31dbcd4769 54 case 0x40u:
mbed_official 82:0b31dbcd4769 55 multiplier = 1920u;
mbed_official 82:0b31dbcd4769 56 break;
mbed_official 82:0b31dbcd4769 57 case 0x60u:
mbed_official 82:0b31dbcd4769 58 multiplier = 2560u;
mbed_official 82:0b31dbcd4769 59 break;
mbed_official 82:0b31dbcd4769 60 case 0x80u:
mbed_official 82:0b31dbcd4769 61 multiplier = 732u;
mbed_official 82:0b31dbcd4769 62 break;
mbed_official 82:0b31dbcd4769 63 case 0xA0u:
mbed_official 82:0b31dbcd4769 64 multiplier = 1464u;
mbed_official 82:0b31dbcd4769 65 break;
mbed_official 82:0b31dbcd4769 66 case 0xC0u:
mbed_official 82:0b31dbcd4769 67 multiplier = 2197u;
mbed_official 82:0b31dbcd4769 68 break;
mbed_official 82:0b31dbcd4769 69 case 0xE0u:
mbed_official 82:0b31dbcd4769 70 default:
mbed_official 82:0b31dbcd4769 71 multiplier = 2929u;
mbed_official 82:0b31dbcd4769 72 break;
mbed_official 82:0b31dbcd4769 73 }
mbed_official 82:0b31dbcd4769 74
mbed_official 82:0b31dbcd4769 75 return MCGClock * divider / multiplier;
mbed_official 82:0b31dbcd4769 76 }
mbed_official 82:0b31dbcd4769 77 #ifdef MCG_C5_PLLCLKEN0_MASK
mbed_official 82:0b31dbcd4769 78 } else { //PLL is selected
mbed_official 82:0b31dbcd4769 79 divider = (1u + (MCG->C5 & MCG_C5_PRDIV0_MASK));
mbed_official 82:0b31dbcd4769 80 multiplier = ((MCG->C6 & MCG_C6_VDIV0_MASK) + 24u);
mbed_official 82:0b31dbcd4769 81 return MCGClock * divider / multiplier;
mbed_official 82:0b31dbcd4769 82 }
mbed_official 82:0b31dbcd4769 83 }
mbed_official 82:0b31dbcd4769 84 #endif
mbed_official 82:0b31dbcd4769 85
mbed_official 82:0b31dbcd4769 86 //In all other cases either there is no crystal or we cannot determine it
mbed_official 82:0b31dbcd4769 87 //For example when the FLL is running on the internal reference, and there is also an
mbed_official 82:0b31dbcd4769 88 //external crystal. However these are unlikely situations
mbed_official 82:0b31dbcd4769 89 return 0;
mbed_official 82:0b31dbcd4769 90 }
mbed_official 82:0b31dbcd4769 91
mbed_official 82:0b31dbcd4769 92 //Get MCG PLL/2 or FLL frequency, depending on which one is active, sets PLLFLLSEL bit
mbed_official 82:0b31dbcd4769 93 static uint32_t mcgpllfll_frequency(void) {
mbed_official 82:0b31dbcd4769 94 if ((MCG->C1 & MCG_C1_CLKS_MASK) != MCG_C1_CLKS(0)) //PLL/FLL is not selected
mbed_official 82:0b31dbcd4769 95 return 0;
mbed_official 82:0b31dbcd4769 96
mbed_official 82:0b31dbcd4769 97 uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
mbed_official 82:0b31dbcd4769 98 #ifdef MCG_C5_PLLCLKEN0_MASK
mbed_official 82:0b31dbcd4769 99 if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
mbed_official 82:0b31dbcd4769 100 SIM->SOPT2 &= ~SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is FLL output
mbed_official 82:0b31dbcd4769 101 #endif
mbed_official 82:0b31dbcd4769 102 return MCGClock;
mbed_official 82:0b31dbcd4769 103 #ifdef MCG_C5_PLLCLKEN0_MASK
mbed_official 82:0b31dbcd4769 104 } else { //PLL is selected
mbed_official 82:0b31dbcd4769 105 SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is PLL output
mbed_official 82:0b31dbcd4769 106 return (MCGClock >> 1);
mbed_official 82:0b31dbcd4769 107 }
mbed_official 82:0b31dbcd4769 108 #endif
mbed_official 82:0b31dbcd4769 109
mbed_official 82:0b31dbcd4769 110 //It is possible the SystemCoreClock isn't running on the PLL, and the PLL is still active
mbed_official 82:0b31dbcd4769 111 //for the peripherals, this is however an unlikely setup
mbed_official 82:0b31dbcd4769 112 }
mbed_official 82:0b31dbcd4769 113
mbed_official 82:0b31dbcd4769 114 #ifdef __cplusplus
mbed_official 82:0b31dbcd4769 115 }
mbed_official 82:0b31dbcd4769 116 #endif
mbed_official 82:0b31dbcd4769 117
mbed_official 82:0b31dbcd4769 118 #endif