1 /* 2 ** ################################################################### 3 ** Processor: LPC834M101FHI33 4 ** Compilers: GNU C Compiler 5 ** IAR ANSI C/C++ Compiler for ARM 6 ** Keil ARM C/C++ Compiler 7 ** MCUXpresso Compiler 8 ** 9 ** Reference manual: LPC83x User manual Rev.1.1 5 October 2016 10 ** Version: rev. 1.1, 2018-02-25 11 ** Build: b201015 12 ** 13 ** Abstract: 14 ** Provides a system configuration function and a global variable that 15 ** contains the system frequency. It configures the device and initializes 16 ** the oscillator (PLL) that is part of the microcontroller device. 17 ** 18 ** Copyright 2016 Freescale Semiconductor, Inc. 19 ** Copyright 2016-2020 NXP 20 ** All rights reserved. 21 ** 22 ** SPDX-License-Identifier: BSD-3-Clause 23 ** 24 ** http: www.nxp.com 25 ** mail: support@nxp.com 26 ** 27 ** Revisions: 28 ** - rev. 1.0 (2018-02-09) 29 ** Initial version. 30 ** - rev. 1.1 (2018-02-25) 31 ** Update some registers according to UM rev 1.2 32 ** 33 ** ################################################################### 34 */ 35 36 /*! 37 * @file LPC834 38 * @version 1.1 39 * @date 2018-02-25 40 * @brief Device specific configuration file for LPC834 (implementation file) 41 * 42 * Provides a system configuration function and a global variable that contains 43 * the system frequency. It configures the device and initializes the oscillator 44 * (PLL) that is part of the microcontroller device. 45 */ 46 47 #include <stdint.h> 48 #include "fsl_device_registers.h" 49 50 /* get system pll input freq */ CLOCK_GetSystemPLLInClkRate(void)51static uint32_t CLOCK_GetSystemPLLInClkRate(void) 52 { 53 uint32_t freq = 0U; 54 55 switch ((SYSCON->SYSPLLCLKSEL & SYSCON_SYSPLLCLKSEL_SEL_MASK)) 56 { 57 /* source from external clock in */ 58 case 0x00U: 59 freq = CLK_IRC_12MHZ; 60 break; 61 /* source from the IRC clock */ 62 case 0x01U: 63 freq = CLK_OSC_IN; 64 break; 65 /* source from external clock clock */ 66 case 0x03U: 67 freq = EXT_CLK_IN; 68 break; 69 default: 70 /* default source from the IRC clock */ 71 freq = CLK_IRC_12MHZ; 72 break; 73 } 74 75 return freq; 76 } 77 78 /* get system pll output freq*/ Clock_GetPLLFreq(uint32_t PLLReg,uint32_t inputRate)79static uint32_t Clock_GetPLLFreq(uint32_t PLLReg, uint32_t inputRate) 80 { 81 uint32_t m_val = ((PLLReg & 0x1FU) + 1U); 82 83 return (inputRate * m_val); 84 } 85 86 87 88 /* ---------------------------------------------------------------------------- 89 -- Core clock 90 ---------------------------------------------------------------------------- */ 91 92 uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK; 93 94 /* ---------------------------------------------------------------------------- 95 -- SystemInit() 96 ---------------------------------------------------------------------------- */ 97 SystemInit(void)98void SystemInit (void) { 99 100 #if defined(__MCUXPRESSO) 101 extern void(*const g_pfnVectors[]) (void); 102 SCB->VTOR = (uint32_t) &g_pfnVectors; 103 #else 104 extern void *__Vectors; 105 SCB->VTOR = (uint32_t) &__Vectors; 106 #endif 107 SystemCoreClock = DEFAULT_SYSTEM_CLOCK; 108 SystemInitHook(); 109 } 110 111 /* ---------------------------------------------------------------------------- 112 -- SystemCoreClockUpdate() 113 ---------------------------------------------------------------------------- */ 114 SystemCoreClockUpdate(void)115void SystemCoreClockUpdate (void) { 116 uint32_t wdt_osc = 0U; 117 uint32_t irc_clk = 12000000U; 118 119 switch ((SYSCON->WDTOSCCTRL >> SYSCON_WDTOSCCTRL_FREQSEL_SHIFT) & 0x0FU) { 120 case 0U: wdt_osc = 0U; break; 121 case 1U: wdt_osc = 600000U; break; 122 case 2U: wdt_osc = 1050000U; break; 123 case 3U: wdt_osc = 1400000U; break; 124 case 4U: wdt_osc = 1750000U; break; 125 case 5U: wdt_osc = 2100000U; break; 126 case 6U: wdt_osc = 2400000U; break; 127 case 7U: wdt_osc = 2700000U; break; 128 case 8U: wdt_osc = 3000000U; break; 129 case 9U: wdt_osc = 3250000U; break; 130 case 10U: wdt_osc = 3500000U; break; 131 case 11U: wdt_osc = 3750000U; break; 132 case 12U: wdt_osc = 4000000U; break; 133 case 13U: wdt_osc = 4200000U; break; 134 case 14U: wdt_osc = 4400000U; break; 135 case 15U: wdt_osc = 4600000U; break; 136 default: wdt_osc = 0U; break; 137 } 138 wdt_osc /= (((SYSCON->WDTOSCCTRL & SYSCON_WDTOSCCTRL_DIVSEL_MASK) + 1U) << 1U); 139 140 switch (SYSCON->MAINCLKSEL & SYSCON_MAINCLKSEL_SEL_MASK) 141 { 142 case 0U: /* IRC */ 143 SystemCoreClock = irc_clk; 144 break; 145 case 1U: /* System PLL input */ 146 switch (SYSCON->SYSPLLCLKSEL & SYSCON_SYSPLLCLKSEL_SEL_MASK) { 147 case 0U: /* IRC */ 148 SystemCoreClock = irc_clk; 149 break; 150 case 1U: /* System oscillator */ 151 SystemCoreClock = CLK_OSC_IN; 152 break; 153 case 3U: /* CLKIN */ 154 SystemCoreClock = EXT_CLK_IN; 155 break; 156 default: 157 SystemCoreClock = irc_clk; /* default is IRC */ 158 break; 159 } 160 break; 161 case 2U: /* watchdog oscillator */ 162 SystemCoreClock = wdt_osc; 163 break; 164 case 3U: /* System PLL */ 165 SystemCoreClock = Clock_GetPLLFreq((SYSCON->SYSPLLCTRL & SYSCON_SYSPLLCTRL_MSEL_MASK), CLOCK_GetSystemPLLInClkRate()); 166 break; 167 default: 168 SystemCoreClock = 0U; 169 break; 170 } 171 172 SystemCoreClock /= SYSCON->SYSAHBCLKDIV; 173 } 174 175 /* ---------------------------------------------------------------------------- 176 -- SystemInitHook() 177 ---------------------------------------------------------------------------- */ 178 SystemInitHook(void)179__attribute__ ((weak)) void SystemInitHook (void) { 180 /* Void implementation of the weak function. */ 181 } 182
