Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

targets/TARGET_Freescale/TARGET_KLXX/clk_freqs.h@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
149:156823d33999 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2006-2013 ARM Limited
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16 #ifndef MBED_CLK_FREQS_H
<> 144:ef7eb2e8f9f7 17 #define MBED_CLK_FREQS_H
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 20 extern "C" {
<> 144:ef7eb2e8f9f7 21 #endif
<> 144:ef7eb2e8f9f7 22
<> 144:ef7eb2e8f9f7 23 #include "PeripheralPins.h"
<> 144:ef7eb2e8f9f7 24
<> 144:ef7eb2e8f9f7 25 //Get the peripheral bus clock frequency
<> 144:ef7eb2e8f9f7 26 static inline uint32_t bus_frequency(void) {
<> 144:ef7eb2e8f9f7 27 return (SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV4_MASK) >> SIM_CLKDIV1_OUTDIV4_SHIFT) + 1));
<> 144:ef7eb2e8f9f7 28 }
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 #if defined(TARGET_KL43Z)
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 static inline uint32_t extosc_frequency(void) {
<> 144:ef7eb2e8f9f7 33 return CPU_XTAL_CLK_HZ;
<> 144:ef7eb2e8f9f7 34 }
<> 144:ef7eb2e8f9f7 35
<> 144:ef7eb2e8f9f7 36 static inline uint32_t fastirc_frequency(void) {
<> 144:ef7eb2e8f9f7 37 return CPU_INT_FAST_CLK_HZ;
<> 144:ef7eb2e8f9f7 38 }
<> 144:ef7eb2e8f9f7 39
<> 144:ef7eb2e8f9f7 40 static inline uint32_t mcgirc_frequency(void) {
<> 144:ef7eb2e8f9f7 41 uint32_t mcgirc_clock = 0;
<> 144:ef7eb2e8f9f7 42
<> 144:ef7eb2e8f9f7 43 if (MCG->C1 & MCG_C1_IREFSTEN_MASK) {
<> 144:ef7eb2e8f9f7 44 mcgirc_clock = (MCG->C2 & MCG_C2_IRCS_MASK) ? 8000000u : 2000000u;
<> 144:ef7eb2e8f9f7 45 mcgirc_clock /= 1u + ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT);
<> 144:ef7eb2e8f9f7 46 mcgirc_clock /= 1u + (MCG->MC & MCG_MC_LIRC_DIV2_MASK);
<> 144:ef7eb2e8f9f7 47 }
<> 144:ef7eb2e8f9f7 48
<> 144:ef7eb2e8f9f7 49 return mcgirc_clock;
<> 144:ef7eb2e8f9f7 50 }
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 #else
<> 144:ef7eb2e8f9f7 53
<> 144:ef7eb2e8f9f7 54 //Get external oscillator (crystal) frequency
<> 144:ef7eb2e8f9f7 55 static uint32_t extosc_frequency(void) {
<> 144:ef7eb2e8f9f7 56 uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(2)) //MCG clock = external reference clock
<> 144:ef7eb2e8f9f7 59 return MCGClock;
<> 144:ef7eb2e8f9f7 60
<> 144:ef7eb2e8f9f7 61 uint32_t divider, multiplier;
<> 144:ef7eb2e8f9f7 62 #ifdef MCG_C5_PLLCLKEN0_MASK //PLL available
<> 144:ef7eb2e8f9f7 63 if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(0)) { //PLL/FLL is selected
<> 144:ef7eb2e8f9f7 64 if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
<> 144:ef7eb2e8f9f7 65 #endif
<> 144:ef7eb2e8f9f7 66 if ((MCG->S & MCG_S_IREFST_MASK) == 0x0u) { //FLL uses external reference
<> 144:ef7eb2e8f9f7 67 divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
<> 144:ef7eb2e8f9f7 68 if ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u)
<> 144:ef7eb2e8f9f7 69 divider <<= 5u;
<> 144:ef7eb2e8f9f7 70 /* Select correct multiplier to calculate the MCG output clock */
<> 144:ef7eb2e8f9f7 71 switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
<> 144:ef7eb2e8f9f7 72 case 0x0u:
<> 144:ef7eb2e8f9f7 73 multiplier = 640u;
<> 144:ef7eb2e8f9f7 74 break;
<> 144:ef7eb2e8f9f7 75 case 0x20u:
<> 144:ef7eb2e8f9f7 76 multiplier = 1280u;
<> 144:ef7eb2e8f9f7 77 break;
<> 144:ef7eb2e8f9f7 78 case 0x40u:
<> 144:ef7eb2e8f9f7 79 multiplier = 1920u;
<> 144:ef7eb2e8f9f7 80 break;
<> 144:ef7eb2e8f9f7 81 case 0x60u:
<> 144:ef7eb2e8f9f7 82 multiplier = 2560u;
<> 144:ef7eb2e8f9f7 83 break;
<> 144:ef7eb2e8f9f7 84 case 0x80u:
<> 144:ef7eb2e8f9f7 85 multiplier = 732u;
<> 144:ef7eb2e8f9f7 86 break;
<> 144:ef7eb2e8f9f7 87 case 0xA0u:
<> 144:ef7eb2e8f9f7 88 multiplier = 1464u;
<> 144:ef7eb2e8f9f7 89 break;
<> 144:ef7eb2e8f9f7 90 case 0xC0u:
<> 144:ef7eb2e8f9f7 91 multiplier = 2197u;
<> 144:ef7eb2e8f9f7 92 break;
<> 144:ef7eb2e8f9f7 93 case 0xE0u:
<> 144:ef7eb2e8f9f7 94 default:
<> 144:ef7eb2e8f9f7 95 multiplier = 2929u;
<> 144:ef7eb2e8f9f7 96 break;
<> 144:ef7eb2e8f9f7 97 }
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 return MCGClock * divider / multiplier;
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101 #ifdef MCG_C5_PLLCLKEN0_MASK
<> 144:ef7eb2e8f9f7 102 } else { //PLL is selected
<> 144:ef7eb2e8f9f7 103 divider = (1u + (MCG->C5 & MCG_C5_PRDIV0_MASK));
<> 144:ef7eb2e8f9f7 104 multiplier = ((MCG->C6 & MCG_C6_VDIV0_MASK) + 24u);
<> 144:ef7eb2e8f9f7 105 return MCGClock * divider / multiplier;
<> 144:ef7eb2e8f9f7 106 }
<> 144:ef7eb2e8f9f7 107 }
<> 144:ef7eb2e8f9f7 108 #endif
<> 144:ef7eb2e8f9f7 109
<> 144:ef7eb2e8f9f7 110 //In all other cases either there is no crystal or we cannot determine it
<> 144:ef7eb2e8f9f7 111 //For example when the FLL is running on the internal reference, and there is also an
<> 144:ef7eb2e8f9f7 112 //external crystal. However these are unlikely situations
<> 144:ef7eb2e8f9f7 113 return 0;
<> 144:ef7eb2e8f9f7 114 }
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 //Get MCG PLL/2 or FLL frequency, depending on which one is active, sets PLLFLLSEL bit
<> 144:ef7eb2e8f9f7 117 static uint32_t mcgpllfll_frequency(void) {
<> 144:ef7eb2e8f9f7 118 if ((MCG->C1 & MCG_C1_CLKS_MASK) != MCG_C1_CLKS(0)) //PLL/FLL is not selected
<> 144:ef7eb2e8f9f7 119 return 0;
<> 144:ef7eb2e8f9f7 120
<> 144:ef7eb2e8f9f7 121 uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
<> 144:ef7eb2e8f9f7 122 #ifdef MCG_C5_PLLCLKEN0_MASK
<> 144:ef7eb2e8f9f7 123 if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
<> 144:ef7eb2e8f9f7 124 SIM->SOPT2 &= ~SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is FLL output
<> 144:ef7eb2e8f9f7 125 #endif
<> 144:ef7eb2e8f9f7 126 return MCGClock;
<> 144:ef7eb2e8f9f7 127 #ifdef MCG_C5_PLLCLKEN0_MASK
<> 144:ef7eb2e8f9f7 128 } else { //PLL is selected
<> 144:ef7eb2e8f9f7 129 SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is PLL output
<> 144:ef7eb2e8f9f7 130 return (MCGClock >> 1);
<> 144:ef7eb2e8f9f7 131 }
<> 144:ef7eb2e8f9f7 132 #endif
<> 144:ef7eb2e8f9f7 133
<> 144:ef7eb2e8f9f7 134 //It is possible the SystemCoreClock isn't running on the PLL, and the PLL is still active
<> 144:ef7eb2e8f9f7 135 //for the peripherals, this is however an unlikely setup
<> 144:ef7eb2e8f9f7 136 }
<> 144:ef7eb2e8f9f7 137
<> 144:ef7eb2e8f9f7 138 #endif
<> 144:ef7eb2e8f9f7 139
<> 144:ef7eb2e8f9f7 140 #ifdef __cplusplus
<> 144:ef7eb2e8f9f7 141 }
<> 144:ef7eb2e8f9f7 142 #endif
<> 144:ef7eb2e8f9f7 143
<> 144:ef7eb2e8f9f7 144 #endif