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: b200526 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 (header 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 #ifndef _SYSTEM_LPC834_H_ 48 #define _SYSTEM_LPC834_H_ /**< Symbol preventing repeated inclusion */ 49 50 #ifdef __cplusplus 51 extern "C" { 52 #endif 53 54 #include <stdint.h> 55 56 #define DEFAULT_SYSTEM_CLOCK 12000000u /* Default System clock value */ 57 #define CLK_RTC_32K_CLK 32768u /* RTC oscillator 32 kHz output (32k_clk */ 58 #define CLK_IRC_12MHZ 12000000u /* FRO 12 MHz (fro_12m) */ 59 #define CLK_OSC_IN 12000000u /* Oscillator input */ 60 #define EXT_CLK_IN 0u /* ext clkin */ 61 62 63 64 65 /** 66 * @brief System clock frequency (core clock) 67 * 68 * The system clock frequency supplied to the SysTick timer and the processor 69 * core clock. This variable can be used by the user application to setup the 70 * SysTick timer or configure other parameters. It may also be used by debugger to 71 * query the frequency of the debug timer or configure the trace clock speed 72 * SystemCoreClock is initialized with a correct predefined value. 73 */ 74 extern uint32_t SystemCoreClock; 75 76 /** 77 * @brief Setup the microcontroller system. 78 * 79 * Typically this function configures the oscillator (PLL) that is part of the 80 * microcontroller device. For systems with variable clock speed it also updates 81 * the variable SystemCoreClock. SystemInit is called from startup_device file. 82 */ 83 void SystemInit (void); 84 85 /** 86 * @brief Updates the SystemCoreClock variable. 87 * 88 * It must be called whenever the core clock is changed during program 89 * execution. SystemCoreClockUpdate() evaluates the clock register settings and calculates 90 * the current core clock. 91 */ 92 void SystemCoreClockUpdate (void); 93 94 /** 95 * @brief SystemInit function hook. 96 * 97 * This weak function allows to call specific initialization code during the 98 * SystemInit() execution.This can be used when an application specific code needs 99 * to be called as close to the reset entry as possible (for example the Multicore 100 * Manager MCMGR_EarlyInit() function call). 101 * NOTE: No global r/w variables can be used in this hook function because the 102 * initialization of these variables happens after this function. 103 */ 104 void SystemInitHook (void); 105 106 #ifdef __cplusplus 107 } 108 #endif 109 110 #endif /* _SYSTEM_LPC834_H_ */ 111
