mbed library sources. Supersedes mbed-src.
Fork of mbed by
targets/cmsis/TARGET_NXP/TARGET_LPC11XX_11CXX/TARGET_LPC11XX/system_LPC11xx.c@0:9b334a45a8ff, 2015-10-01 (annotated)
- Committer:
- bogdanm
- Date:
- Thu Oct 01 15:25:22 2015 +0300
- Revision:
- 0:9b334a45a8ff
- Child:
- 144:ef7eb2e8f9f7
Initial commit on mbed-dev
Replaces mbed-src (now inactive)
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 0:9b334a45a8ff | 1 | /**************************************************************************//** |
bogdanm | 0:9b334a45a8ff | 2 | * @file system_LPC11xx.c |
bogdanm | 0:9b334a45a8ff | 3 | * @brief CMSIS Cortex-M0 Device Peripheral Access Layer Source File |
bogdanm | 0:9b334a45a8ff | 4 | * for the NXP LPC11xx/LPC11Cxx Devices |
bogdanm | 0:9b334a45a8ff | 5 | * @version V1.10 |
bogdanm | 0:9b334a45a8ff | 6 | * @date 24. November 2010 |
bogdanm | 0:9b334a45a8ff | 7 | * |
bogdanm | 0:9b334a45a8ff | 8 | * @note |
bogdanm | 0:9b334a45a8ff | 9 | * Copyright (C) 2009-2010 ARM Limited. All rights reserved. |
bogdanm | 0:9b334a45a8ff | 10 | * |
bogdanm | 0:9b334a45a8ff | 11 | * @par |
bogdanm | 0:9b334a45a8ff | 12 | * ARM Limited (ARM) is supplying this software for use with Cortex-M |
bogdanm | 0:9b334a45a8ff | 13 | * processor based microcontrollers. This file can be freely distributed |
bogdanm | 0:9b334a45a8ff | 14 | * within development tools that are supporting such ARM based processors. |
bogdanm | 0:9b334a45a8ff | 15 | * |
bogdanm | 0:9b334a45a8ff | 16 | * @par |
bogdanm | 0:9b334a45a8ff | 17 | * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED |
bogdanm | 0:9b334a45a8ff | 18 | * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF |
bogdanm | 0:9b334a45a8ff | 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. |
bogdanm | 0:9b334a45a8ff | 20 | * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR |
bogdanm | 0:9b334a45a8ff | 21 | * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. |
bogdanm | 0:9b334a45a8ff | 22 | * |
bogdanm | 0:9b334a45a8ff | 23 | ******************************************************************************/ |
bogdanm | 0:9b334a45a8ff | 24 | |
bogdanm | 0:9b334a45a8ff | 25 | |
bogdanm | 0:9b334a45a8ff | 26 | #include <stdint.h> |
bogdanm | 0:9b334a45a8ff | 27 | #include "LPC11xx.h" |
bogdanm | 0:9b334a45a8ff | 28 | |
bogdanm | 0:9b334a45a8ff | 29 | /* |
bogdanm | 0:9b334a45a8ff | 30 | //-------- <<< Use Configuration Wizard in Context Menu >>> ------------------ |
bogdanm | 0:9b334a45a8ff | 31 | */ |
bogdanm | 0:9b334a45a8ff | 32 | |
bogdanm | 0:9b334a45a8ff | 33 | /*--------------------- Clock Configuration ---------------------------------- |
bogdanm | 0:9b334a45a8ff | 34 | // |
bogdanm | 0:9b334a45a8ff | 35 | // <e> Clock Configuration |
bogdanm | 0:9b334a45a8ff | 36 | // <h> System Oscillator Control Register (SYSOSCCTRL) |
bogdanm | 0:9b334a45a8ff | 37 | // <o1.0> BYPASS: System Oscillator Bypass Enable |
bogdanm | 0:9b334a45a8ff | 38 | // <i> If enabled then PLL input (sys_osc_clk) is fed |
bogdanm | 0:9b334a45a8ff | 39 | // <i> directly from XTALIN and XTALOUT pins. |
bogdanm | 0:9b334a45a8ff | 40 | // <o1.9> FREQRANGE: System Oscillator Frequency Range |
bogdanm | 0:9b334a45a8ff | 41 | // <i> Determines frequency range for Low-power oscillator. |
bogdanm | 0:9b334a45a8ff | 42 | // <0=> 1 - 20 MHz |
bogdanm | 0:9b334a45a8ff | 43 | // <1=> 15 - 25 MHz |
bogdanm | 0:9b334a45a8ff | 44 | // </h> |
bogdanm | 0:9b334a45a8ff | 45 | // |
bogdanm | 0:9b334a45a8ff | 46 | // <h> Watchdog Oscillator Control Register (WDTOSCCTRL) |
bogdanm | 0:9b334a45a8ff | 47 | // <o2.0..4> DIVSEL: Select Divider for Fclkana |
bogdanm | 0:9b334a45a8ff | 48 | // <i> wdt_osc_clk = Fclkana/ (2 * (1 + DIVSEL)) |
bogdanm | 0:9b334a45a8ff | 49 | // <0-31> |
bogdanm | 0:9b334a45a8ff | 50 | // <o2.5..8> FREQSEL: Select Watchdog Oscillator Analog Output Frequency (Fclkana) |
bogdanm | 0:9b334a45a8ff | 51 | // <0=> Undefined |
bogdanm | 0:9b334a45a8ff | 52 | // <1=> 0.5 MHz |
bogdanm | 0:9b334a45a8ff | 53 | // <2=> 0.8 MHz |
bogdanm | 0:9b334a45a8ff | 54 | // <3=> 1.1 MHz |
bogdanm | 0:9b334a45a8ff | 55 | // <4=> 1.4 MHz |
bogdanm | 0:9b334a45a8ff | 56 | // <5=> 1.6 MHz |
bogdanm | 0:9b334a45a8ff | 57 | // <6=> 1.8 MHz |
bogdanm | 0:9b334a45a8ff | 58 | // <7=> 2.0 MHz |
bogdanm | 0:9b334a45a8ff | 59 | // <8=> 2.2 MHz |
bogdanm | 0:9b334a45a8ff | 60 | // <9=> 2.4 MHz |
bogdanm | 0:9b334a45a8ff | 61 | // <10=> 2.6 MHz |
bogdanm | 0:9b334a45a8ff | 62 | // <11=> 2.7 MHz |
bogdanm | 0:9b334a45a8ff | 63 | // <12=> 2.9 MHz |
bogdanm | 0:9b334a45a8ff | 64 | // <13=> 3.1 MHz |
bogdanm | 0:9b334a45a8ff | 65 | // <14=> 3.2 MHz |
bogdanm | 0:9b334a45a8ff | 66 | // <15=> 3.4 MHz |
bogdanm | 0:9b334a45a8ff | 67 | // </h> |
bogdanm | 0:9b334a45a8ff | 68 | // |
bogdanm | 0:9b334a45a8ff | 69 | // <h> System PLL Control Register (SYSPLLCTRL) |
bogdanm | 0:9b334a45a8ff | 70 | // <i> F_clkout = M * F_clkin = F_CCO / (2 * P) |
bogdanm | 0:9b334a45a8ff | 71 | // <i> F_clkin must be in the range of 10 MHz to 25 MHz |
bogdanm | 0:9b334a45a8ff | 72 | // <i> F_CCO must be in the range of 156 MHz to 320 MHz |
bogdanm | 0:9b334a45a8ff | 73 | // <o3.0..4> MSEL: Feedback Divider Selection |
bogdanm | 0:9b334a45a8ff | 74 | // <i> M = MSEL + 1 |
bogdanm | 0:9b334a45a8ff | 75 | // <0-31> |
bogdanm | 0:9b334a45a8ff | 76 | // <o3.5..6> PSEL: Post Divider Selection |
bogdanm | 0:9b334a45a8ff | 77 | // <0=> P = 1 |
bogdanm | 0:9b334a45a8ff | 78 | // <1=> P = 2 |
bogdanm | 0:9b334a45a8ff | 79 | // <2=> P = 4 |
bogdanm | 0:9b334a45a8ff | 80 | // <3=> P = 8 |
bogdanm | 0:9b334a45a8ff | 81 | // </h> |
bogdanm | 0:9b334a45a8ff | 82 | // |
bogdanm | 0:9b334a45a8ff | 83 | // <h> System PLL Clock Source Select Register (SYSPLLCLKSEL) |
bogdanm | 0:9b334a45a8ff | 84 | // <o4.0..1> SEL: System PLL Clock Source |
bogdanm | 0:9b334a45a8ff | 85 | // <0=> IRC Oscillator |
bogdanm | 0:9b334a45a8ff | 86 | // <1=> System Oscillator |
bogdanm | 0:9b334a45a8ff | 87 | // <2=> Reserved |
bogdanm | 0:9b334a45a8ff | 88 | // <3=> Reserved |
bogdanm | 0:9b334a45a8ff | 89 | // </h> |
bogdanm | 0:9b334a45a8ff | 90 | // |
bogdanm | 0:9b334a45a8ff | 91 | // <h> Main Clock Source Select Register (MAINCLKSEL) |
bogdanm | 0:9b334a45a8ff | 92 | // <o5.0..1> SEL: Clock Source for Main Clock |
bogdanm | 0:9b334a45a8ff | 93 | // <0=> IRC Oscillator |
bogdanm | 0:9b334a45a8ff | 94 | // <1=> Input Clock to System PLL |
bogdanm | 0:9b334a45a8ff | 95 | // <2=> WDT Oscillator |
bogdanm | 0:9b334a45a8ff | 96 | // <3=> System PLL Clock Out |
bogdanm | 0:9b334a45a8ff | 97 | // </h> |
bogdanm | 0:9b334a45a8ff | 98 | // |
bogdanm | 0:9b334a45a8ff | 99 | // <h> System AHB Clock Divider Register (SYSAHBCLKDIV) |
bogdanm | 0:9b334a45a8ff | 100 | // <o6.0..7> DIV: System AHB Clock Divider |
bogdanm | 0:9b334a45a8ff | 101 | // <i> Divides main clock to provide system clock to core, memories, and peripherals. |
bogdanm | 0:9b334a45a8ff | 102 | // <i> 0 = is disabled |
bogdanm | 0:9b334a45a8ff | 103 | // <0-255> |
bogdanm | 0:9b334a45a8ff | 104 | // </h> |
bogdanm | 0:9b334a45a8ff | 105 | // </e> |
bogdanm | 0:9b334a45a8ff | 106 | */ |
bogdanm | 0:9b334a45a8ff | 107 | #define CLOCK_SETUP 1 |
bogdanm | 0:9b334a45a8ff | 108 | #define SYSOSCCTRL_Val 0x00000000 // Reset: 0x000 |
bogdanm | 0:9b334a45a8ff | 109 | #define WDTOSCCTRL_Val 0x00000000 // Reset: 0x000 |
bogdanm | 0:9b334a45a8ff | 110 | #define SYSPLLCTRL_Val 0x00000023 // Reset: 0x000 |
bogdanm | 0:9b334a45a8ff | 111 | #define SYSPLLCLKSEL_Val 0x00000000 // Reset: 0x000 // Define as using IRC |
bogdanm | 0:9b334a45a8ff | 112 | #define MAINCLKSEL_Val 0x00000003 // Reset: 0x000 // Define as using System PLL clock out |
bogdanm | 0:9b334a45a8ff | 113 | #define SYSAHBCLKDIV_Val 0x00000001 // Reset: 0x001 |
bogdanm | 0:9b334a45a8ff | 114 | |
bogdanm | 0:9b334a45a8ff | 115 | /* |
bogdanm | 0:9b334a45a8ff | 116 | //-------- <<< end of configuration section >>> ------------------------------ |
bogdanm | 0:9b334a45a8ff | 117 | */ |
bogdanm | 0:9b334a45a8ff | 118 | |
bogdanm | 0:9b334a45a8ff | 119 | /*---------------------------------------------------------------------------- |
bogdanm | 0:9b334a45a8ff | 120 | Check the register settings |
bogdanm | 0:9b334a45a8ff | 121 | *----------------------------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 122 | #define CHECK_RANGE(val, min, max) ((val < min) || (val > max)) |
bogdanm | 0:9b334a45a8ff | 123 | #define CHECK_RSVD(val, mask) (val & mask) |
bogdanm | 0:9b334a45a8ff | 124 | |
bogdanm | 0:9b334a45a8ff | 125 | /* Clock Configuration -------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 126 | #if (CHECK_RSVD((SYSOSCCTRL_Val), ~0x00000003)) |
bogdanm | 0:9b334a45a8ff | 127 | #error "SYSOSCCTRL: Invalid values of reserved bits!" |
bogdanm | 0:9b334a45a8ff | 128 | #endif |
bogdanm | 0:9b334a45a8ff | 129 | |
bogdanm | 0:9b334a45a8ff | 130 | #if (CHECK_RSVD((WDTOSCCTRL_Val), ~0x000001FF)) |
bogdanm | 0:9b334a45a8ff | 131 | #error "WDTOSCCTRL: Invalid values of reserved bits!" |
bogdanm | 0:9b334a45a8ff | 132 | #endif |
bogdanm | 0:9b334a45a8ff | 133 | |
bogdanm | 0:9b334a45a8ff | 134 | #if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 2)) |
bogdanm | 0:9b334a45a8ff | 135 | #error "SYSPLLCLKSEL: Value out of range!" |
bogdanm | 0:9b334a45a8ff | 136 | #endif |
bogdanm | 0:9b334a45a8ff | 137 | |
bogdanm | 0:9b334a45a8ff | 138 | #if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000001FF)) |
bogdanm | 0:9b334a45a8ff | 139 | #error "SYSPLLCTRL: Invalid values of reserved bits!" |
bogdanm | 0:9b334a45a8ff | 140 | #endif |
bogdanm | 0:9b334a45a8ff | 141 | |
bogdanm | 0:9b334a45a8ff | 142 | #if (CHECK_RSVD((MAINCLKSEL_Val), ~0x00000003)) |
bogdanm | 0:9b334a45a8ff | 143 | #error "MAINCLKSEL: Invalid values of reserved bits!" |
bogdanm | 0:9b334a45a8ff | 144 | #endif |
bogdanm | 0:9b334a45a8ff | 145 | |
bogdanm | 0:9b334a45a8ff | 146 | #if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255)) |
bogdanm | 0:9b334a45a8ff | 147 | #error "SYSAHBCLKDIV: Value out of range!" |
bogdanm | 0:9b334a45a8ff | 148 | #endif |
bogdanm | 0:9b334a45a8ff | 149 | |
bogdanm | 0:9b334a45a8ff | 150 | |
bogdanm | 0:9b334a45a8ff | 151 | /*---------------------------------------------------------------------------- |
bogdanm | 0:9b334a45a8ff | 152 | DEFINES |
bogdanm | 0:9b334a45a8ff | 153 | *----------------------------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 154 | |
bogdanm | 0:9b334a45a8ff | 155 | /*---------------------------------------------------------------------------- |
bogdanm | 0:9b334a45a8ff | 156 | Define clocks |
bogdanm | 0:9b334a45a8ff | 157 | *----------------------------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 158 | #define __XTAL (12000000UL) /* Oscillator frequency */ |
bogdanm | 0:9b334a45a8ff | 159 | #define __SYS_OSC_CLK ( __XTAL) /* Main oscillator frequency */ |
bogdanm | 0:9b334a45a8ff | 160 | #define __IRC_OSC_CLK (12000000UL) /* Internal RC oscillator frequency */ |
bogdanm | 0:9b334a45a8ff | 161 | |
bogdanm | 0:9b334a45a8ff | 162 | |
bogdanm | 0:9b334a45a8ff | 163 | #define __FREQSEL ((WDTOSCCTRL_Val >> 5) & 0x0F) |
bogdanm | 0:9b334a45a8ff | 164 | #define __DIVSEL (((WDTOSCCTRL_Val & 0x1F) << 1) + 2) |
bogdanm | 0:9b334a45a8ff | 165 | |
bogdanm | 0:9b334a45a8ff | 166 | #if (CLOCK_SETUP) /* Clock Setup */ |
bogdanm | 0:9b334a45a8ff | 167 | #if (__FREQSEL == 0) |
bogdanm | 0:9b334a45a8ff | 168 | #define __WDT_OSC_CLK ( 0) /* undefined */ |
bogdanm | 0:9b334a45a8ff | 169 | #elif (__FREQSEL == 1) |
bogdanm | 0:9b334a45a8ff | 170 | #define __WDT_OSC_CLK ( 500000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 171 | #elif (__FREQSEL == 2) |
bogdanm | 0:9b334a45a8ff | 172 | #define __WDT_OSC_CLK ( 800000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 173 | #elif (__FREQSEL == 3) |
bogdanm | 0:9b334a45a8ff | 174 | #define __WDT_OSC_CLK (1100000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 175 | #elif (__FREQSEL == 4) |
bogdanm | 0:9b334a45a8ff | 176 | #define __WDT_OSC_CLK (1400000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 177 | #elif (__FREQSEL == 5) |
bogdanm | 0:9b334a45a8ff | 178 | #define __WDT_OSC_CLK (1600000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 179 | #elif (__FREQSEL == 6) |
bogdanm | 0:9b334a45a8ff | 180 | #define __WDT_OSC_CLK (1800000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 181 | #elif (__FREQSEL == 7) |
bogdanm | 0:9b334a45a8ff | 182 | #define __WDT_OSC_CLK (2000000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 183 | #elif (__FREQSEL == 8) |
bogdanm | 0:9b334a45a8ff | 184 | #define __WDT_OSC_CLK (2200000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 185 | #elif (__FREQSEL == 9) |
bogdanm | 0:9b334a45a8ff | 186 | #define __WDT_OSC_CLK (2400000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 187 | #elif (__FREQSEL == 10) |
bogdanm | 0:9b334a45a8ff | 188 | #define __WDT_OSC_CLK (2600000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 189 | #elif (__FREQSEL == 11) |
bogdanm | 0:9b334a45a8ff | 190 | #define __WDT_OSC_CLK (2700000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 191 | #elif (__FREQSEL == 12) |
bogdanm | 0:9b334a45a8ff | 192 | #define __WDT_OSC_CLK (2900000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 193 | #elif (__FREQSEL == 13) |
bogdanm | 0:9b334a45a8ff | 194 | #define __WDT_OSC_CLK (3100000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 195 | #elif (__FREQSEL == 14) |
bogdanm | 0:9b334a45a8ff | 196 | #define __WDT_OSC_CLK (3200000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 197 | #else |
bogdanm | 0:9b334a45a8ff | 198 | #define __WDT_OSC_CLK (3400000 / __DIVSEL) |
bogdanm | 0:9b334a45a8ff | 199 | #endif |
bogdanm | 0:9b334a45a8ff | 200 | |
bogdanm | 0:9b334a45a8ff | 201 | /* sys_pllclkin calculation */ |
bogdanm | 0:9b334a45a8ff | 202 | #if ((SYSPLLCLKSEL_Val & 0x03) == 0) |
bogdanm | 0:9b334a45a8ff | 203 | #define __SYS_PLLCLKIN (__IRC_OSC_CLK) |
bogdanm | 0:9b334a45a8ff | 204 | #elif ((SYSPLLCLKSEL_Val & 0x03) == 1) |
bogdanm | 0:9b334a45a8ff | 205 | #define __SYS_PLLCLKIN (__SYS_OSC_CLK) |
bogdanm | 0:9b334a45a8ff | 206 | #else |
bogdanm | 0:9b334a45a8ff | 207 | #define __SYS_PLLCLKIN (0) |
bogdanm | 0:9b334a45a8ff | 208 | #endif |
bogdanm | 0:9b334a45a8ff | 209 | |
bogdanm | 0:9b334a45a8ff | 210 | #define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1)) |
bogdanm | 0:9b334a45a8ff | 211 | |
bogdanm | 0:9b334a45a8ff | 212 | /* main clock calculation */ |
bogdanm | 0:9b334a45a8ff | 213 | #if ((MAINCLKSEL_Val & 0x03) == 0) |
bogdanm | 0:9b334a45a8ff | 214 | #define __MAIN_CLOCK (__IRC_OSC_CLK) |
bogdanm | 0:9b334a45a8ff | 215 | #elif ((MAINCLKSEL_Val & 0x03) == 1) |
bogdanm | 0:9b334a45a8ff | 216 | #define __MAIN_CLOCK (__SYS_PLLCLKIN) |
bogdanm | 0:9b334a45a8ff | 217 | #elif ((MAINCLKSEL_Val & 0x03) == 2) |
bogdanm | 0:9b334a45a8ff | 218 | #if (__FREQSEL == 0) |
bogdanm | 0:9b334a45a8ff | 219 | #error "MAINCLKSEL: WDT Oscillator selected but FREQSEL is undefined!" |
bogdanm | 0:9b334a45a8ff | 220 | #else |
bogdanm | 0:9b334a45a8ff | 221 | #define __MAIN_CLOCK (__WDT_OSC_CLK) |
bogdanm | 0:9b334a45a8ff | 222 | #endif |
bogdanm | 0:9b334a45a8ff | 223 | #elif ((MAINCLKSEL_Val & 0x03) == 3) |
bogdanm | 0:9b334a45a8ff | 224 | #define __MAIN_CLOCK (__SYS_PLLCLKOUT) |
bogdanm | 0:9b334a45a8ff | 225 | #else |
bogdanm | 0:9b334a45a8ff | 226 | #define __MAIN_CLOCK (0) |
bogdanm | 0:9b334a45a8ff | 227 | #endif |
bogdanm | 0:9b334a45a8ff | 228 | |
bogdanm | 0:9b334a45a8ff | 229 | #define __SYSTEM_CLOCK (__MAIN_CLOCK / SYSAHBCLKDIV_Val) |
bogdanm | 0:9b334a45a8ff | 230 | |
bogdanm | 0:9b334a45a8ff | 231 | #else |
bogdanm | 0:9b334a45a8ff | 232 | #define __SYSTEM_CLOCK (__IRC_OSC_CLK) |
bogdanm | 0:9b334a45a8ff | 233 | #endif // CLOCK_SETUP |
bogdanm | 0:9b334a45a8ff | 234 | |
bogdanm | 0:9b334a45a8ff | 235 | |
bogdanm | 0:9b334a45a8ff | 236 | /*---------------------------------------------------------------------------- |
bogdanm | 0:9b334a45a8ff | 237 | Clock Variable definitions |
bogdanm | 0:9b334a45a8ff | 238 | *----------------------------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 239 | uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/ |
bogdanm | 0:9b334a45a8ff | 240 | |
bogdanm | 0:9b334a45a8ff | 241 | |
bogdanm | 0:9b334a45a8ff | 242 | /*---------------------------------------------------------------------------- |
bogdanm | 0:9b334a45a8ff | 243 | Clock functions |
bogdanm | 0:9b334a45a8ff | 244 | *----------------------------------------------------------------------------*/ |
bogdanm | 0:9b334a45a8ff | 245 | void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */ |
bogdanm | 0:9b334a45a8ff | 246 | { |
bogdanm | 0:9b334a45a8ff | 247 | uint32_t wdt_osc = 0; |
bogdanm | 0:9b334a45a8ff | 248 | |
bogdanm | 0:9b334a45a8ff | 249 | /* Determine clock frequency according to clock register values */ |
bogdanm | 0:9b334a45a8ff | 250 | switch ((LPC_SYSCON->WDTOSCCTRL >> 5) & 0x0F) { |
bogdanm | 0:9b334a45a8ff | 251 | case 0: wdt_osc = 0; break; |
bogdanm | 0:9b334a45a8ff | 252 | case 1: wdt_osc = 500000; break; |
bogdanm | 0:9b334a45a8ff | 253 | case 2: wdt_osc = 800000; break; |
bogdanm | 0:9b334a45a8ff | 254 | case 3: wdt_osc = 1100000; break; |
bogdanm | 0:9b334a45a8ff | 255 | case 4: wdt_osc = 1400000; break; |
bogdanm | 0:9b334a45a8ff | 256 | case 5: wdt_osc = 1600000; break; |
bogdanm | 0:9b334a45a8ff | 257 | case 6: wdt_osc = 1800000; break; |
bogdanm | 0:9b334a45a8ff | 258 | case 7: wdt_osc = 2000000; break; |
bogdanm | 0:9b334a45a8ff | 259 | case 8: wdt_osc = 2200000; break; |
bogdanm | 0:9b334a45a8ff | 260 | case 9: wdt_osc = 2400000; break; |
bogdanm | 0:9b334a45a8ff | 261 | case 10: wdt_osc = 2600000; break; |
bogdanm | 0:9b334a45a8ff | 262 | case 11: wdt_osc = 2700000; break; |
bogdanm | 0:9b334a45a8ff | 263 | case 12: wdt_osc = 2900000; break; |
bogdanm | 0:9b334a45a8ff | 264 | case 13: wdt_osc = 3100000; break; |
bogdanm | 0:9b334a45a8ff | 265 | case 14: wdt_osc = 3200000; break; |
bogdanm | 0:9b334a45a8ff | 266 | case 15: wdt_osc = 3400000; break; |
bogdanm | 0:9b334a45a8ff | 267 | } |
bogdanm | 0:9b334a45a8ff | 268 | wdt_osc /= ((LPC_SYSCON->WDTOSCCTRL & 0x1F) << 1) + 2; |
bogdanm | 0:9b334a45a8ff | 269 | |
bogdanm | 0:9b334a45a8ff | 270 | switch (LPC_SYSCON->MAINCLKSEL & 0x03) { |
bogdanm | 0:9b334a45a8ff | 271 | case 0: /* Internal RC oscillator */ |
bogdanm | 0:9b334a45a8ff | 272 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 0:9b334a45a8ff | 273 | break; |
bogdanm | 0:9b334a45a8ff | 274 | case 1: /* Input Clock to System PLL */ |
bogdanm | 0:9b334a45a8ff | 275 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
bogdanm | 0:9b334a45a8ff | 276 | case 0: /* Internal RC oscillator */ |
bogdanm | 0:9b334a45a8ff | 277 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 0:9b334a45a8ff | 278 | break; |
bogdanm | 0:9b334a45a8ff | 279 | case 1: /* System oscillator */ |
bogdanm | 0:9b334a45a8ff | 280 | SystemCoreClock = __SYS_OSC_CLK; |
bogdanm | 0:9b334a45a8ff | 281 | break; |
bogdanm | 0:9b334a45a8ff | 282 | case 2: /* Reserved */ |
bogdanm | 0:9b334a45a8ff | 283 | case 3: /* Reserved */ |
bogdanm | 0:9b334a45a8ff | 284 | SystemCoreClock = 0; |
bogdanm | 0:9b334a45a8ff | 285 | break; |
bogdanm | 0:9b334a45a8ff | 286 | } |
bogdanm | 0:9b334a45a8ff | 287 | break; |
bogdanm | 0:9b334a45a8ff | 288 | case 2: /* WDT Oscillator */ |
bogdanm | 0:9b334a45a8ff | 289 | SystemCoreClock = wdt_osc; |
bogdanm | 0:9b334a45a8ff | 290 | break; |
bogdanm | 0:9b334a45a8ff | 291 | case 3: /* System PLL Clock Out */ |
bogdanm | 0:9b334a45a8ff | 292 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
bogdanm | 0:9b334a45a8ff | 293 | case 0: /* Internal RC oscillator */ |
bogdanm | 0:9b334a45a8ff | 294 | if (LPC_SYSCON->SYSPLLCTRL & 0x180) { |
bogdanm | 0:9b334a45a8ff | 295 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 0:9b334a45a8ff | 296 | } else { |
bogdanm | 0:9b334a45a8ff | 297 | SystemCoreClock = __IRC_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
bogdanm | 0:9b334a45a8ff | 298 | } |
bogdanm | 0:9b334a45a8ff | 299 | break; |
bogdanm | 0:9b334a45a8ff | 300 | case 1: /* System oscillator */ |
bogdanm | 0:9b334a45a8ff | 301 | if (LPC_SYSCON->SYSPLLCTRL & 0x180) { |
bogdanm | 0:9b334a45a8ff | 302 | SystemCoreClock = __SYS_OSC_CLK; |
bogdanm | 0:9b334a45a8ff | 303 | } else { |
bogdanm | 0:9b334a45a8ff | 304 | SystemCoreClock = __SYS_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
bogdanm | 0:9b334a45a8ff | 305 | } |
bogdanm | 0:9b334a45a8ff | 306 | break; |
bogdanm | 0:9b334a45a8ff | 307 | case 2: /* Reserved */ |
bogdanm | 0:9b334a45a8ff | 308 | case 3: /* Reserved */ |
bogdanm | 0:9b334a45a8ff | 309 | SystemCoreClock = 0; |
bogdanm | 0:9b334a45a8ff | 310 | break; |
bogdanm | 0:9b334a45a8ff | 311 | } |
bogdanm | 0:9b334a45a8ff | 312 | break; |
bogdanm | 0:9b334a45a8ff | 313 | } |
bogdanm | 0:9b334a45a8ff | 314 | |
bogdanm | 0:9b334a45a8ff | 315 | SystemCoreClock /= LPC_SYSCON->SYSAHBCLKDIV; |
bogdanm | 0:9b334a45a8ff | 316 | |
bogdanm | 0:9b334a45a8ff | 317 | } |
bogdanm | 0:9b334a45a8ff | 318 | |
bogdanm | 0:9b334a45a8ff | 319 | /** |
bogdanm | 0:9b334a45a8ff | 320 | * Initialize the system |
bogdanm | 0:9b334a45a8ff | 321 | * |
bogdanm | 0:9b334a45a8ff | 322 | * @param none |
bogdanm | 0:9b334a45a8ff | 323 | * @return none |
bogdanm | 0:9b334a45a8ff | 324 | * |
bogdanm | 0:9b334a45a8ff | 325 | * @brief Setup the microcontroller system. |
bogdanm | 0:9b334a45a8ff | 326 | * Initialize the System. |
bogdanm | 0:9b334a45a8ff | 327 | */ |
bogdanm | 0:9b334a45a8ff | 328 | void SystemInit (void) { |
bogdanm | 0:9b334a45a8ff | 329 | volatile uint32_t i; |
bogdanm | 0:9b334a45a8ff | 330 | |
bogdanm | 0:9b334a45a8ff | 331 | #if (CLOCK_SETUP) /* Clock Setup */ |
bogdanm | 0:9b334a45a8ff | 332 | |
bogdanm | 0:9b334a45a8ff | 333 | #if ((SYSPLLCLKSEL_Val & 0x03) == 1) |
bogdanm | 0:9b334a45a8ff | 334 | LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* Power-up System Osc */ |
bogdanm | 0:9b334a45a8ff | 335 | LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val; |
bogdanm | 0:9b334a45a8ff | 336 | for (i = 0; i < 200; i++) __NOP(); |
bogdanm | 0:9b334a45a8ff | 337 | #endif |
bogdanm | 0:9b334a45a8ff | 338 | |
bogdanm | 0:9b334a45a8ff | 339 | LPC_SYSCON->SYSPLLCLKSEL = SYSPLLCLKSEL_Val; /* Select PLL Input */ |
bogdanm | 0:9b334a45a8ff | 340 | LPC_SYSCON->SYSPLLCLKUEN = 0x01; /* Update Clock Source */ |
bogdanm | 0:9b334a45a8ff | 341 | LPC_SYSCON->SYSPLLCLKUEN = 0x00; /* Toggle Update Register */ |
bogdanm | 0:9b334a45a8ff | 342 | LPC_SYSCON->SYSPLLCLKUEN = 0x01; |
bogdanm | 0:9b334a45a8ff | 343 | while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); /* Wait Until Updated */ |
bogdanm | 0:9b334a45a8ff | 344 | #if ((MAINCLKSEL_Val & 0x03) == 3) /* Main Clock is PLL Out */ |
bogdanm | 0:9b334a45a8ff | 345 | LPC_SYSCON->SYSPLLCTRL = SYSPLLCTRL_Val; |
bogdanm | 0:9b334a45a8ff | 346 | LPC_SYSCON->PDRUNCFG &= ~(1 << 7); /* Power-up SYSPLL */ |
bogdanm | 0:9b334a45a8ff | 347 | while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */ |
bogdanm | 0:9b334a45a8ff | 348 | #endif |
bogdanm | 0:9b334a45a8ff | 349 | |
bogdanm | 0:9b334a45a8ff | 350 | #if (((MAINCLKSEL_Val & 0x03) == 2) ) |
bogdanm | 0:9b334a45a8ff | 351 | LPC_SYSCON->WDTOSCCTRL = WDTOSCCTRL_Val; |
bogdanm | 0:9b334a45a8ff | 352 | LPC_SYSCON->PDRUNCFG &= ~(1 << 6); /* Power-up WDT Clock */ |
bogdanm | 0:9b334a45a8ff | 353 | for (i = 0; i < 200; i++) __NOP(); |
bogdanm | 0:9b334a45a8ff | 354 | #endif |
bogdanm | 0:9b334a45a8ff | 355 | |
bogdanm | 0:9b334a45a8ff | 356 | LPC_SYSCON->MAINCLKSEL = MAINCLKSEL_Val; /* Select PLL Clock Output */ |
bogdanm | 0:9b334a45a8ff | 357 | LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */ |
bogdanm | 0:9b334a45a8ff | 358 | LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */ |
bogdanm | 0:9b334a45a8ff | 359 | LPC_SYSCON->MAINCLKUEN = 0x01; |
bogdanm | 0:9b334a45a8ff | 360 | while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */ |
bogdanm | 0:9b334a45a8ff | 361 | |
bogdanm | 0:9b334a45a8ff | 362 | LPC_SYSCON->SYSAHBCLKDIV = SYSAHBCLKDIV_Val; |
bogdanm | 0:9b334a45a8ff | 363 | #endif |
bogdanm | 0:9b334a45a8ff | 364 | /* System clock to the IOCON needs to be enabled or |
bogdanm | 0:9b334a45a8ff | 365 | most of the I/O related peripherals won't work. */ |
bogdanm | 0:9b334a45a8ff | 366 | LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16); |
bogdanm | 0:9b334a45a8ff | 367 | } |