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MCUXpresso_MKS22FN256xxx12/devices/MKS22F12/system_MKS22F12.c

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/*
** ###################################################################
** Processors: MKS22FN128VFT12
** MKS22FN128VLH12
** MKS22FN128VLL12
** MKS22FN256VFT12
** MKS22FN256VLH12
** MKS22FN256VLL12
**
** Compilers: Keil ARM C/C++ Compiler
** Freescale C/C++ for Embedded ARM
** GNU C Compiler
** IAR ANSI C/C++ Compiler for ARM
** MCUXpresso Compiler
**
** Reference manual: KS22P100M120SF0RM, Rev. 3, May, 2016
** Version: rev. 2.1, 2017-06-09
** Build: b171226
**
** Abstract:
** Provides a system configuration function and a global variable that
** contains the system frequency. It configures the device and initializes
** the oscillator (PLL) that is part of the microcontroller device.
**
** The Clear BSD License
** Copyright 2016 Freescale Semiconductor, Inc.
** Copyright 2016-2017 NXP
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted (subject to the limitations in the
** disclaimer below) provided that the following conditions are met:
**
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
**
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** * Neither the name of the copyright holder nor the names of its
** contributors may be used to endorse or promote products derived from
** this software without specific prior written permission.
**
** NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
** GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
** HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
** http: www.nxp.com
** mail: support@nxp.com
**
** Revisions:
** - rev. 1.0 (2015-06-23)
** Initial version.
** - rev. 2.0 (2015-10-10)
** Update according to Rev1 RM, Sep 2015.
** - rev. 2.1 (2017-06-09)
** Update according to Rev3 RM, May 2016.
**
** ###################################################################
*/
/*!
* @file MKS22F12
* @version 2.1
* @date 2017-06-09
* @brief Device specific configuration file for MKS22F12 (implementation file)
*
* Provides a system configuration function and a global variable that contains
* the system frequency. It configures the device and initializes the oscillator
* (PLL) that is part of the microcontroller device.
*/
#include <stdint.h>
#include "fsl_device_registers.h"
/* ----------------------------------------------------------------------------
-- Core clock
---------------------------------------------------------------------------- */
uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
/* ----------------------------------------------------------------------------
-- SystemInit()
---------------------------------------------------------------------------- */
void SystemInit (void) {
#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access */
#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */
#if (DISABLE_WDOG)
/* WDOG->UNLOCK: WDOGUNLOCK=0xC520 */
WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xC520); /* Key 1 */
/* WDOG->UNLOCK: WDOGUNLOCK=0xD928 */
WDOG->UNLOCK = WDOG_UNLOCK_WDOGUNLOCK(0xD928); /* Key 2 */
/* WDOG->STCTRLH: ?=0,DISTESTWDOG=0,BYTESEL=0,TESTSEL=0,TESTWDOG=0,?=0,?=1,WAITEN=1,STOPEN=1,DBGEN=0,ALLOWUPDATE=1,WINEN=0,IRQRSTEN=0,CLKSRC=1,WDOGEN=0 */
WDOG->STCTRLH = WDOG_STCTRLH_BYTESEL(0x00) |
WDOG_STCTRLH_WAITEN_MASK |
WDOG_STCTRLH_STOPEN_MASK |
WDOG_STCTRLH_ALLOWUPDATE_MASK |
WDOG_STCTRLH_CLKSRC_MASK |
0x0100U;
#endif /* (DISABLE_WDOG) */
SystemInitHook();
}
/* ----------------------------------------------------------------------------
-- SystemCoreClockUpdate()
---------------------------------------------------------------------------- */
void SystemCoreClockUpdate (void) {
uint32_t MCGOUTClock; /* Variable to store output clock frequency of the MCG module */
uint16_t Divider;
if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x00U) {
/* Output of FLL or PLL is selected */
if ((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U) {
/* FLL is selected */
if ((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U) {
/* External reference clock is selected */
switch (MCG->C7 & MCG_C7_OSCSEL_MASK) {
case 0x00U:
MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */
break;
case 0x01U:
MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
break;
case 0x02U:
default:
MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */
break;
}
if (((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) && ((MCG->C7 & MCG_C7_OSCSEL_MASK) != 0x01U)) {
switch (MCG->C1 & MCG_C1_FRDIV_MASK) {
case 0x38U:
Divider = 1536U;
break;
case 0x30U:
Divider = 1280U;
break;
default:
Divider = (uint16_t)(32LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
break;
}
} else {/* ((MCG->C2 & MCG_C2_RANGE_MASK) != 0x00U) */
Divider = (uint16_t)(1LU << ((MCG->C1 & MCG_C1_FRDIV_MASK) >> MCG_C1_FRDIV_SHIFT));
}
MCGOUTClock = (MCGOUTClock / Divider); /* Calculate the divided FLL reference clock */
} else { /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */
MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* The slow internal reference clock is selected */
} /* (!((MCG->C1 & MCG_C1_IREFS_MASK) == 0x00U)) */
/* Select correct multiplier to calculate the MCG output clock */
switch (MCG->C4 & (MCG_C4_DMX32_MASK | MCG_C4_DRST_DRS_MASK)) {
case 0x00U:
MCGOUTClock *= 640U;
break;
case 0x20U:
MCGOUTClock *= 1280U;
break;
case 0x40U:
MCGOUTClock *= 1920U;
break;
case 0x60U:
MCGOUTClock *= 2560U;
break;
case 0x80U:
MCGOUTClock *= 732U;
break;
case 0xA0U:
MCGOUTClock *= 1464U;
break;
case 0xC0U:
MCGOUTClock *= 2197U;
break;
case 0xE0U:
MCGOUTClock *= 2929U;
break;
default:
break;
}
} else { /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */
/* PLL is selected */
Divider = (((uint16_t)MCG->C5 & MCG_C5_PRDIV0_MASK) + 0x01U);
MCGOUTClock = (uint32_t)(CPU_XTAL_CLK_HZ / Divider); /* Calculate the PLL reference clock */
Divider = (((uint16_t)MCG->C6 & MCG_C6_VDIV0_MASK) + 24U);
MCGOUTClock *= Divider; /* Calculate the MCG output clock */
} /* (!((MCG->C6 & MCG_C6_PLLS_MASK) == 0x00U)) */
} else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x40U) {
/* Internal reference clock is selected */
if ((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U) {
MCGOUTClock = CPU_INT_SLOW_CLK_HZ; /* Slow internal reference clock selected */
} else { /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */
Divider = (uint16_t)(0x01LU << ((MCG->SC & MCG_SC_FCRDIV_MASK) >> MCG_SC_FCRDIV_SHIFT));
MCGOUTClock = (uint32_t) (CPU_INT_FAST_CLK_HZ / Divider); /* Fast internal reference clock selected */
} /* (!((MCG->C2 & MCG_C2_IRCS_MASK) == 0x00U)) */
} else if ((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U) {
/* External reference clock is selected */
switch (MCG->C7 & MCG_C7_OSCSEL_MASK) {
case 0x00U:
MCGOUTClock = CPU_XTAL_CLK_HZ; /* System oscillator drives MCG clock */
break;
case 0x01U:
MCGOUTClock = CPU_XTAL32k_CLK_HZ; /* RTC 32 kHz oscillator drives MCG clock */
break;
case 0x02U:
default:
MCGOUTClock = CPU_INT_IRC_CLK_HZ; /* IRC 48MHz oscillator drives MCG clock */
break;
}
} else { /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */
/* Reserved value */
return;
} /* (!((MCG->C1 & MCG_C1_CLKS_MASK) == 0x80U)) */
SystemCoreClock = (MCGOUTClock / (0x01U + ((SIM->CLKDIV1 & SIM_CLKDIV1_OUTDIV1_MASK) >> SIM_CLKDIV1_OUTDIV1_SHIFT)));
}
/* ----------------------------------------------------------------------------
-- SystemInitHook()
---------------------------------------------------------------------------- */
__attribute__ ((weak)) void SystemInitHook (void) {
/* Void implementation of the weak function. */
}
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