1 /* 2 ** ################################################################### 3 ** Processors: LPC822M101JDH20 4 ** LPC822M101JHI33 5 ** 6 ** Compilers: GNU C Compiler 7 ** IAR ANSI C/C++ Compiler for ARM 8 ** Keil ARM C/C++ Compiler 9 ** MCUXpresso Compiler 10 ** 11 ** Reference manual: LPC82x User manual Rev.1.2 5 October 2016 12 ** Version: rev. 1.1, 2018-02-25 13 ** Build: b200526 14 ** 15 ** Abstract: 16 ** Provides a system configuration function and a global variable that 17 ** contains the system frequency. It configures the device and initializes 18 ** the oscillator (PLL) that is part of the microcontroller device. 19 ** 20 ** Copyright 2016 Freescale Semiconductor, Inc. 21 ** Copyright 2016-2020 NXP 22 ** All rights reserved. 23 ** 24 ** SPDX-License-Identifier: BSD-3-Clause 25 ** 26 ** http: www.nxp.com 27 ** mail: support@nxp.com 28 ** 29 ** Revisions: 30 ** - rev. 1.0 (2018-02-09) 31 ** Initial version. 32 ** - rev. 1.1 (2018-02-25) 33 ** Update some registers according to UM rev 1.2 34 ** 35 ** ################################################################### 36 */ 37 38 /*! 39 * @file LPC822 40 * @version 1.1 41 * @date 2018-02-25 42 * @brief Device specific configuration file for LPC822 (header file) 43 * 44 * Provides a system configuration function and a global variable that contains 45 * the system frequency. It configures the device and initializes the oscillator 46 * (PLL) that is part of the microcontroller device. 47 */ 48 49 #ifndef _SYSTEM_LPC822_H_ 50 #define _SYSTEM_LPC822_H_ /**< Symbol preventing repeated inclusion */ 51 52 #ifdef __cplusplus 53 extern "C" { 54 #endif 55 56 #include <stdint.h> 57 58 #define DEFAULT_SYSTEM_CLOCK 12000000u /* Default System clock value */ 59 #define CLK_RTC_32K_CLK 32768u /* RTC oscillator 32 kHz output (32k_clk */ 60 #define CLK_IRC_12MHZ 12000000u /* FRO 12 MHz (fro_12m) */ 61 #define CLK_OSC_IN 12000000u /* Oscillator input */ 62 #define EXT_CLK_IN 0u /* ext clkin */ 63 64 65 66 67 /** 68 * @brief System clock frequency (core clock) 69 * 70 * The system clock frequency supplied to the SysTick timer and the processor 71 * core clock. This variable can be used by the user application to setup the 72 * SysTick timer or configure other parameters. It may also be used by debugger to 73 * query the frequency of the debug timer or configure the trace clock speed 74 * SystemCoreClock is initialized with a correct predefined value. 75 */ 76 extern uint32_t SystemCoreClock; 77 78 /** 79 * @brief Setup the microcontroller system. 80 * 81 * Typically this function configures the oscillator (PLL) that is part of the 82 * microcontroller device. For systems with variable clock speed it also updates 83 * the variable SystemCoreClock. SystemInit is called from startup_device file. 84 */ 85 void SystemInit (void); 86 87 /** 88 * @brief Updates the SystemCoreClock variable. 89 * 90 * It must be called whenever the core clock is changed during program 91 * execution. SystemCoreClockUpdate() evaluates the clock register settings and calculates 92 * the current core clock. 93 */ 94 void SystemCoreClockUpdate (void); 95 96 /** 97 * @brief SystemInit function hook. 98 * 99 * This weak function allows to call specific initialization code during the 100 * SystemInit() execution.This can be used when an application specific code needs 101 * to be called as close to the reset entry as possible (for example the Multicore 102 * Manager MCMGR_EarlyInit() function call). 103 * NOTE: No global r/w variables can be used in this hook function because the 104 * initialization of these variables happens after this function. 105 */ 106 void SystemInitHook (void); 107 108 #ifdef __cplusplus 109 } 110 #endif 111 112 #endif /* _SYSTEM_LPC822_H_ */ 113
