+++ /dev/null
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2015 ARM Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#ifndef CLK_FREQS_H
-#define CLK_FREQS_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/*!
- * \brief Get the peripheral bus clock frequency
- * \return Bus frequency
- */
-static inline uint32_t bus_frequency(void) {
- return SystemCoreClock / (((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV2_MASK) >> SIM_CLKDIV1_OUTDIV2_SHIFT) + 1);
-}
-
-/*!
- * \brief Get external oscillator (crystal) frequency
- * \return External osc frequency
- */
-static uint32_t extosc_frequency(void) {
- uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
-
- if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(2)) //MCG clock = external reference clock
- return MCGClock;
-
- if ((MCG->C1 & MCG_C1_CLKS_MASK) == MCG_C1_CLKS(0)) { //PLL/FLL is selected
- uint32_t divider, multiplier;
- if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
- if ((MCG->S & MCG_S_IREFST_MASK) == 0x0u) { //FLL uses external reference
- divider = (uint8_t)(1u << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
- if ((MCG->C2 & MCG_C2_RANGE0_MASK) != 0x0u)
- divider <<= 5u;
- /* Select correct multiplier to calculate the MCG output clock */
- switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
- case 0x0u:
- multiplier = 640u;
- break;
- case 0x20u:
- multiplier = 1280u;
- break;
- case 0x40u:
- multiplier = 1920u;
- break;
- case 0x60u:
- multiplier = 2560u;
- break;
- case 0x80u:
- multiplier = 732u;
- break;
- case 0xA0u:
- multiplier = 1464u;
- break;
- case 0xC0u:
- multiplier = 2197u;
- break;
- case 0xE0u:
- default:
- multiplier = 2929u;
- break;
- }
-
- return MCGClock * divider / multiplier;
- }
- } else { //PLL is selected
- divider = (1u + (MCG->C5 & MCG_C5_PRDIV0_MASK));
- multiplier = ((MCG->C6 & MCG_C6_VDIV0_MASK) + 24u);
- return MCGClock * divider / multiplier;
- }
- }
-
- //In all other cases either there is no crystal or we cannot determine it
- //For example when the FLL is running on the internal reference, and there is also an
- //external crystal. However these are unlikely situations
- return 0;
-}
-
-//Get MCG PLL/2 or FLL frequency, depending on which one is active, sets PLLFLLSEL bit
-static uint32_t mcgpllfll_frequency(void) {
- if ((MCG->C1 & MCG_C1_CLKS_MASK) != MCG_C1_CLKS(0)) //PLL/FLL is not selected
- return 0;
-
- uint32_t MCGClock = SystemCoreClock * (1u + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT));
- if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x0u) { //FLL is selected
- SIM->SOPT2 &= ~SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is FLL output
- return MCGClock;
- } else { //PLL is selected
- SIM->SOPT2 |= SIM_SOPT2_PLLFLLSEL_MASK; //MCG peripheral clock is PLL output
- return MCGClock;
- }
-
- //It is possible the SystemCoreClock isn't running on the PLL, and the PLL is still active
- //for the peripherals, this is however an unlikely setup
-}
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif