mbed library sources: Modified to operate FRDM-KL25Z at 48MHz from internal 32kHz oscillator (nothing else changed).
Fork of mbed-src by
The only file that changed is: mbed-src-FLL48/targets/cmsis/TARGET_Freescale/TARGET_KL25Z/system_MKL25Z4.h
targets/cmsis/TARGET_NXP/TARGET_LPC11XX/system_LPC11xx.c@20:4263a77256ae, 2013-09-10 (annotated)
- Committer:
- bogdanm
- Date:
- Tue Sep 10 15:14:19 2013 +0300
- Revision:
- 20:4263a77256ae
- Parent:
- 19:398f4c622e1b
Sync with git revision 171dda705c947bf910926a0b73d6a4797802554d
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
bogdanm | 19:398f4c622e1b | 1 | /**************************************************************************//** |
bogdanm | 19:398f4c622e1b | 2 | * @file system_LPC11xx.c |
bogdanm | 19:398f4c622e1b | 3 | * @brief CMSIS Cortex-M0 Device Peripheral Access Layer Source File |
bogdanm | 19:398f4c622e1b | 4 | * for the NXP LPC11xx/LPC11Cxx Devices |
bogdanm | 19:398f4c622e1b | 5 | * @version V1.10 |
bogdanm | 19:398f4c622e1b | 6 | * @date 24. November 2010 |
bogdanm | 19:398f4c622e1b | 7 | * |
bogdanm | 19:398f4c622e1b | 8 | * @note |
bogdanm | 19:398f4c622e1b | 9 | * Copyright (C) 2009-2010 ARM Limited. All rights reserved. |
bogdanm | 19:398f4c622e1b | 10 | * |
bogdanm | 19:398f4c622e1b | 11 | * @par |
bogdanm | 19:398f4c622e1b | 12 | * ARM Limited (ARM) is supplying this software for use with Cortex-M |
bogdanm | 19:398f4c622e1b | 13 | * processor based microcontrollers. This file can be freely distributed |
bogdanm | 19:398f4c622e1b | 14 | * within development tools that are supporting such ARM based processors. |
bogdanm | 19:398f4c622e1b | 15 | * |
bogdanm | 19:398f4c622e1b | 16 | * @par |
bogdanm | 19:398f4c622e1b | 17 | * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED |
bogdanm | 19:398f4c622e1b | 18 | * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF |
bogdanm | 19:398f4c622e1b | 19 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. |
bogdanm | 19:398f4c622e1b | 20 | * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR |
bogdanm | 19:398f4c622e1b | 21 | * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. |
bogdanm | 19:398f4c622e1b | 22 | * |
bogdanm | 19:398f4c622e1b | 23 | ******************************************************************************/ |
bogdanm | 19:398f4c622e1b | 24 | |
bogdanm | 19:398f4c622e1b | 25 | |
bogdanm | 19:398f4c622e1b | 26 | #include <stdint.h> |
bogdanm | 19:398f4c622e1b | 27 | #include "LPC11xx.h" |
bogdanm | 19:398f4c622e1b | 28 | |
bogdanm | 19:398f4c622e1b | 29 | /* |
bogdanm | 19:398f4c622e1b | 30 | //-------- <<< Use Configuration Wizard in Context Menu >>> ------------------ |
bogdanm | 19:398f4c622e1b | 31 | */ |
bogdanm | 19:398f4c622e1b | 32 | |
bogdanm | 19:398f4c622e1b | 33 | /*--------------------- Clock Configuration ---------------------------------- |
bogdanm | 19:398f4c622e1b | 34 | // |
bogdanm | 19:398f4c622e1b | 35 | // <e> Clock Configuration |
bogdanm | 19:398f4c622e1b | 36 | // <h> System Oscillator Control Register (SYSOSCCTRL) |
bogdanm | 19:398f4c622e1b | 37 | // <o1.0> BYPASS: System Oscillator Bypass Enable |
bogdanm | 19:398f4c622e1b | 38 | // <i> If enabled then PLL input (sys_osc_clk) is fed |
bogdanm | 19:398f4c622e1b | 39 | // <i> directly from XTALIN and XTALOUT pins. |
bogdanm | 19:398f4c622e1b | 40 | // <o1.9> FREQRANGE: System Oscillator Frequency Range |
bogdanm | 19:398f4c622e1b | 41 | // <i> Determines frequency range for Low-power oscillator. |
bogdanm | 19:398f4c622e1b | 42 | // <0=> 1 - 20 MHz |
bogdanm | 19:398f4c622e1b | 43 | // <1=> 15 - 25 MHz |
bogdanm | 19:398f4c622e1b | 44 | // </h> |
bogdanm | 19:398f4c622e1b | 45 | // |
bogdanm | 19:398f4c622e1b | 46 | // <h> Watchdog Oscillator Control Register (WDTOSCCTRL) |
bogdanm | 19:398f4c622e1b | 47 | // <o2.0..4> DIVSEL: Select Divider for Fclkana |
bogdanm | 19:398f4c622e1b | 48 | // <i> wdt_osc_clk = Fclkana/ (2 * (1 + DIVSEL)) |
bogdanm | 19:398f4c622e1b | 49 | // <0-31> |
bogdanm | 19:398f4c622e1b | 50 | // <o2.5..8> FREQSEL: Select Watchdog Oscillator Analog Output Frequency (Fclkana) |
bogdanm | 19:398f4c622e1b | 51 | // <0=> Undefined |
bogdanm | 19:398f4c622e1b | 52 | // <1=> 0.5 MHz |
bogdanm | 19:398f4c622e1b | 53 | // <2=> 0.8 MHz |
bogdanm | 19:398f4c622e1b | 54 | // <3=> 1.1 MHz |
bogdanm | 19:398f4c622e1b | 55 | // <4=> 1.4 MHz |
bogdanm | 19:398f4c622e1b | 56 | // <5=> 1.6 MHz |
bogdanm | 19:398f4c622e1b | 57 | // <6=> 1.8 MHz |
bogdanm | 19:398f4c622e1b | 58 | // <7=> 2.0 MHz |
bogdanm | 19:398f4c622e1b | 59 | // <8=> 2.2 MHz |
bogdanm | 19:398f4c622e1b | 60 | // <9=> 2.4 MHz |
bogdanm | 19:398f4c622e1b | 61 | // <10=> 2.6 MHz |
bogdanm | 19:398f4c622e1b | 62 | // <11=> 2.7 MHz |
bogdanm | 19:398f4c622e1b | 63 | // <12=> 2.9 MHz |
bogdanm | 19:398f4c622e1b | 64 | // <13=> 3.1 MHz |
bogdanm | 19:398f4c622e1b | 65 | // <14=> 3.2 MHz |
bogdanm | 19:398f4c622e1b | 66 | // <15=> 3.4 MHz |
bogdanm | 19:398f4c622e1b | 67 | // </h> |
bogdanm | 19:398f4c622e1b | 68 | // |
bogdanm | 19:398f4c622e1b | 69 | // <h> System PLL Control Register (SYSPLLCTRL) |
bogdanm | 19:398f4c622e1b | 70 | // <i> F_clkout = M * F_clkin = F_CCO / (2 * P) |
bogdanm | 19:398f4c622e1b | 71 | // <i> F_clkin must be in the range of 10 MHz to 25 MHz |
bogdanm | 19:398f4c622e1b | 72 | // <i> F_CCO must be in the range of 156 MHz to 320 MHz |
bogdanm | 19:398f4c622e1b | 73 | // <o3.0..4> MSEL: Feedback Divider Selection |
bogdanm | 19:398f4c622e1b | 74 | // <i> M = MSEL + 1 |
bogdanm | 19:398f4c622e1b | 75 | // <0-31> |
bogdanm | 19:398f4c622e1b | 76 | // <o3.5..6> PSEL: Post Divider Selection |
bogdanm | 19:398f4c622e1b | 77 | // <0=> P = 1 |
bogdanm | 19:398f4c622e1b | 78 | // <1=> P = 2 |
bogdanm | 19:398f4c622e1b | 79 | // <2=> P = 4 |
bogdanm | 19:398f4c622e1b | 80 | // <3=> P = 8 |
bogdanm | 19:398f4c622e1b | 81 | // </h> |
bogdanm | 19:398f4c622e1b | 82 | // |
bogdanm | 19:398f4c622e1b | 83 | // <h> System PLL Clock Source Select Register (SYSPLLCLKSEL) |
bogdanm | 19:398f4c622e1b | 84 | // <o4.0..1> SEL: System PLL Clock Source |
bogdanm | 19:398f4c622e1b | 85 | // <0=> IRC Oscillator |
bogdanm | 19:398f4c622e1b | 86 | // <1=> System Oscillator |
bogdanm | 19:398f4c622e1b | 87 | // <2=> Reserved |
bogdanm | 19:398f4c622e1b | 88 | // <3=> Reserved |
bogdanm | 19:398f4c622e1b | 89 | // </h> |
bogdanm | 19:398f4c622e1b | 90 | // |
bogdanm | 19:398f4c622e1b | 91 | // <h> Main Clock Source Select Register (MAINCLKSEL) |
bogdanm | 19:398f4c622e1b | 92 | // <o5.0..1> SEL: Clock Source for Main Clock |
bogdanm | 19:398f4c622e1b | 93 | // <0=> IRC Oscillator |
bogdanm | 19:398f4c622e1b | 94 | // <1=> Input Clock to System PLL |
bogdanm | 19:398f4c622e1b | 95 | // <2=> WDT Oscillator |
bogdanm | 19:398f4c622e1b | 96 | // <3=> System PLL Clock Out |
bogdanm | 19:398f4c622e1b | 97 | // </h> |
bogdanm | 19:398f4c622e1b | 98 | // |
bogdanm | 19:398f4c622e1b | 99 | // <h> System AHB Clock Divider Register (SYSAHBCLKDIV) |
bogdanm | 19:398f4c622e1b | 100 | // <o6.0..7> DIV: System AHB Clock Divider |
bogdanm | 19:398f4c622e1b | 101 | // <i> Divides main clock to provide system clock to core, memories, and peripherals. |
bogdanm | 19:398f4c622e1b | 102 | // <i> 0 = is disabled |
bogdanm | 19:398f4c622e1b | 103 | // <0-255> |
bogdanm | 19:398f4c622e1b | 104 | // </h> |
bogdanm | 19:398f4c622e1b | 105 | // </e> |
bogdanm | 19:398f4c622e1b | 106 | */ |
bogdanm | 19:398f4c622e1b | 107 | #define CLOCK_SETUP 1 |
bogdanm | 19:398f4c622e1b | 108 | #define SYSOSCCTRL_Val 0x00000000 // Reset: 0x000 |
bogdanm | 19:398f4c622e1b | 109 | #define WDTOSCCTRL_Val 0x00000000 // Reset: 0x000 |
bogdanm | 19:398f4c622e1b | 110 | #define SYSPLLCTRL_Val 0x00000023 // Reset: 0x000 |
bogdanm | 20:4263a77256ae | 111 | #define SYSPLLCLKSEL_Val 0x00000000 // Reset: 0x000 // Define as using IRC |
bogdanm | 20:4263a77256ae | 112 | #define MAINCLKSEL_Val 0x00000003 // Reset: 0x000 // Define as using System PLL clock out |
bogdanm | 19:398f4c622e1b | 113 | #define SYSAHBCLKDIV_Val 0x00000001 // Reset: 0x001 |
bogdanm | 19:398f4c622e1b | 114 | |
bogdanm | 19:398f4c622e1b | 115 | /* |
bogdanm | 19:398f4c622e1b | 116 | //-------- <<< end of configuration section >>> ------------------------------ |
bogdanm | 19:398f4c622e1b | 117 | */ |
bogdanm | 19:398f4c622e1b | 118 | |
bogdanm | 19:398f4c622e1b | 119 | /*---------------------------------------------------------------------------- |
bogdanm | 19:398f4c622e1b | 120 | Check the register settings |
bogdanm | 19:398f4c622e1b | 121 | *----------------------------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 122 | #define CHECK_RANGE(val, min, max) ((val < min) || (val > max)) |
bogdanm | 19:398f4c622e1b | 123 | #define CHECK_RSVD(val, mask) (val & mask) |
bogdanm | 19:398f4c622e1b | 124 | |
bogdanm | 19:398f4c622e1b | 125 | /* Clock Configuration -------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 126 | #if (CHECK_RSVD((SYSOSCCTRL_Val), ~0x00000003)) |
bogdanm | 19:398f4c622e1b | 127 | #error "SYSOSCCTRL: Invalid values of reserved bits!" |
bogdanm | 19:398f4c622e1b | 128 | #endif |
bogdanm | 19:398f4c622e1b | 129 | |
bogdanm | 19:398f4c622e1b | 130 | #if (CHECK_RSVD((WDTOSCCTRL_Val), ~0x000001FF)) |
bogdanm | 19:398f4c622e1b | 131 | #error "WDTOSCCTRL: Invalid values of reserved bits!" |
bogdanm | 19:398f4c622e1b | 132 | #endif |
bogdanm | 19:398f4c622e1b | 133 | |
bogdanm | 19:398f4c622e1b | 134 | #if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 2)) |
bogdanm | 19:398f4c622e1b | 135 | #error "SYSPLLCLKSEL: Value out of range!" |
bogdanm | 19:398f4c622e1b | 136 | #endif |
bogdanm | 19:398f4c622e1b | 137 | |
bogdanm | 19:398f4c622e1b | 138 | #if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000001FF)) |
bogdanm | 19:398f4c622e1b | 139 | #error "SYSPLLCTRL: Invalid values of reserved bits!" |
bogdanm | 19:398f4c622e1b | 140 | #endif |
bogdanm | 19:398f4c622e1b | 141 | |
bogdanm | 19:398f4c622e1b | 142 | #if (CHECK_RSVD((MAINCLKSEL_Val), ~0x00000003)) |
bogdanm | 19:398f4c622e1b | 143 | #error "MAINCLKSEL: Invalid values of reserved bits!" |
bogdanm | 19:398f4c622e1b | 144 | #endif |
bogdanm | 19:398f4c622e1b | 145 | |
bogdanm | 19:398f4c622e1b | 146 | #if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255)) |
bogdanm | 19:398f4c622e1b | 147 | #error "SYSAHBCLKDIV: Value out of range!" |
bogdanm | 19:398f4c622e1b | 148 | #endif |
bogdanm | 19:398f4c622e1b | 149 | |
bogdanm | 19:398f4c622e1b | 150 | |
bogdanm | 19:398f4c622e1b | 151 | /*---------------------------------------------------------------------------- |
bogdanm | 19:398f4c622e1b | 152 | DEFINES |
bogdanm | 19:398f4c622e1b | 153 | *----------------------------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 154 | |
bogdanm | 19:398f4c622e1b | 155 | /*---------------------------------------------------------------------------- |
bogdanm | 19:398f4c622e1b | 156 | Define clocks |
bogdanm | 19:398f4c622e1b | 157 | *----------------------------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 158 | #define __XTAL (12000000UL) /* Oscillator frequency */ |
bogdanm | 19:398f4c622e1b | 159 | #define __SYS_OSC_CLK ( __XTAL) /* Main oscillator frequency */ |
bogdanm | 19:398f4c622e1b | 160 | #define __IRC_OSC_CLK (12000000UL) /* Internal RC oscillator frequency */ |
bogdanm | 19:398f4c622e1b | 161 | |
bogdanm | 19:398f4c622e1b | 162 | |
bogdanm | 19:398f4c622e1b | 163 | #define __FREQSEL ((WDTOSCCTRL_Val >> 5) & 0x0F) |
bogdanm | 19:398f4c622e1b | 164 | #define __DIVSEL (((WDTOSCCTRL_Val & 0x1F) << 1) + 2) |
bogdanm | 19:398f4c622e1b | 165 | |
bogdanm | 19:398f4c622e1b | 166 | #if (CLOCK_SETUP) /* Clock Setup */ |
bogdanm | 19:398f4c622e1b | 167 | #if (__FREQSEL == 0) |
bogdanm | 19:398f4c622e1b | 168 | #define __WDT_OSC_CLK ( 0) /* undefined */ |
bogdanm | 19:398f4c622e1b | 169 | #elif (__FREQSEL == 1) |
bogdanm | 19:398f4c622e1b | 170 | #define __WDT_OSC_CLK ( 500000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 171 | #elif (__FREQSEL == 2) |
bogdanm | 19:398f4c622e1b | 172 | #define __WDT_OSC_CLK ( 800000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 173 | #elif (__FREQSEL == 3) |
bogdanm | 19:398f4c622e1b | 174 | #define __WDT_OSC_CLK (1100000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 175 | #elif (__FREQSEL == 4) |
bogdanm | 19:398f4c622e1b | 176 | #define __WDT_OSC_CLK (1400000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 177 | #elif (__FREQSEL == 5) |
bogdanm | 19:398f4c622e1b | 178 | #define __WDT_OSC_CLK (1600000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 179 | #elif (__FREQSEL == 6) |
bogdanm | 19:398f4c622e1b | 180 | #define __WDT_OSC_CLK (1800000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 181 | #elif (__FREQSEL == 7) |
bogdanm | 19:398f4c622e1b | 182 | #define __WDT_OSC_CLK (2000000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 183 | #elif (__FREQSEL == 8) |
bogdanm | 19:398f4c622e1b | 184 | #define __WDT_OSC_CLK (2200000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 185 | #elif (__FREQSEL == 9) |
bogdanm | 19:398f4c622e1b | 186 | #define __WDT_OSC_CLK (2400000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 187 | #elif (__FREQSEL == 10) |
bogdanm | 19:398f4c622e1b | 188 | #define __WDT_OSC_CLK (2600000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 189 | #elif (__FREQSEL == 11) |
bogdanm | 19:398f4c622e1b | 190 | #define __WDT_OSC_CLK (2700000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 191 | #elif (__FREQSEL == 12) |
bogdanm | 19:398f4c622e1b | 192 | #define __WDT_OSC_CLK (2900000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 193 | #elif (__FREQSEL == 13) |
bogdanm | 19:398f4c622e1b | 194 | #define __WDT_OSC_CLK (3100000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 195 | #elif (__FREQSEL == 14) |
bogdanm | 19:398f4c622e1b | 196 | #define __WDT_OSC_CLK (3200000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 197 | #else |
bogdanm | 19:398f4c622e1b | 198 | #define __WDT_OSC_CLK (3400000 / __DIVSEL) |
bogdanm | 19:398f4c622e1b | 199 | #endif |
bogdanm | 19:398f4c622e1b | 200 | |
bogdanm | 19:398f4c622e1b | 201 | /* sys_pllclkin calculation */ |
bogdanm | 19:398f4c622e1b | 202 | #if ((SYSPLLCLKSEL_Val & 0x03) == 0) |
bogdanm | 19:398f4c622e1b | 203 | #define __SYS_PLLCLKIN (__IRC_OSC_CLK) |
bogdanm | 19:398f4c622e1b | 204 | #elif ((SYSPLLCLKSEL_Val & 0x03) == 1) |
bogdanm | 19:398f4c622e1b | 205 | #define __SYS_PLLCLKIN (__SYS_OSC_CLK) |
bogdanm | 19:398f4c622e1b | 206 | #else |
bogdanm | 19:398f4c622e1b | 207 | #define __SYS_PLLCLKIN (0) |
bogdanm | 19:398f4c622e1b | 208 | #endif |
bogdanm | 19:398f4c622e1b | 209 | |
bogdanm | 19:398f4c622e1b | 210 | #define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1)) |
bogdanm | 19:398f4c622e1b | 211 | |
bogdanm | 19:398f4c622e1b | 212 | /* main clock calculation */ |
bogdanm | 19:398f4c622e1b | 213 | #if ((MAINCLKSEL_Val & 0x03) == 0) |
bogdanm | 19:398f4c622e1b | 214 | #define __MAIN_CLOCK (__IRC_OSC_CLK) |
bogdanm | 19:398f4c622e1b | 215 | #elif ((MAINCLKSEL_Val & 0x03) == 1) |
bogdanm | 19:398f4c622e1b | 216 | #define __MAIN_CLOCK (__SYS_PLLCLKIN) |
bogdanm | 19:398f4c622e1b | 217 | #elif ((MAINCLKSEL_Val & 0x03) == 2) |
bogdanm | 19:398f4c622e1b | 218 | #if (__FREQSEL == 0) |
bogdanm | 19:398f4c622e1b | 219 | #error "MAINCLKSEL: WDT Oscillator selected but FREQSEL is undefined!" |
bogdanm | 19:398f4c622e1b | 220 | #else |
bogdanm | 19:398f4c622e1b | 221 | #define __MAIN_CLOCK (__WDT_OSC_CLK) |
bogdanm | 19:398f4c622e1b | 222 | #endif |
bogdanm | 19:398f4c622e1b | 223 | #elif ((MAINCLKSEL_Val & 0x03) == 3) |
bogdanm | 19:398f4c622e1b | 224 | #define __MAIN_CLOCK (__SYS_PLLCLKOUT) |
bogdanm | 19:398f4c622e1b | 225 | #else |
bogdanm | 19:398f4c622e1b | 226 | #define __MAIN_CLOCK (0) |
bogdanm | 19:398f4c622e1b | 227 | #endif |
bogdanm | 19:398f4c622e1b | 228 | |
bogdanm | 19:398f4c622e1b | 229 | #define __SYSTEM_CLOCK (__MAIN_CLOCK / SYSAHBCLKDIV_Val) |
bogdanm | 19:398f4c622e1b | 230 | |
bogdanm | 19:398f4c622e1b | 231 | #else |
bogdanm | 19:398f4c622e1b | 232 | #define __SYSTEM_CLOCK (__IRC_OSC_CLK) |
bogdanm | 19:398f4c622e1b | 233 | #endif // CLOCK_SETUP |
bogdanm | 19:398f4c622e1b | 234 | |
bogdanm | 19:398f4c622e1b | 235 | |
bogdanm | 19:398f4c622e1b | 236 | /*---------------------------------------------------------------------------- |
bogdanm | 19:398f4c622e1b | 237 | Clock Variable definitions |
bogdanm | 19:398f4c622e1b | 238 | *----------------------------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 239 | uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/ |
bogdanm | 19:398f4c622e1b | 240 | |
bogdanm | 19:398f4c622e1b | 241 | |
bogdanm | 19:398f4c622e1b | 242 | /*---------------------------------------------------------------------------- |
bogdanm | 19:398f4c622e1b | 243 | Clock functions |
bogdanm | 19:398f4c622e1b | 244 | *----------------------------------------------------------------------------*/ |
bogdanm | 19:398f4c622e1b | 245 | void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */ |
bogdanm | 19:398f4c622e1b | 246 | { |
bogdanm | 19:398f4c622e1b | 247 | uint32_t wdt_osc = 0; |
bogdanm | 19:398f4c622e1b | 248 | |
bogdanm | 19:398f4c622e1b | 249 | /* Determine clock frequency according to clock register values */ |
bogdanm | 19:398f4c622e1b | 250 | switch ((LPC_SYSCON->WDTOSCCTRL >> 5) & 0x0F) { |
bogdanm | 19:398f4c622e1b | 251 | case 0: wdt_osc = 0; break; |
bogdanm | 19:398f4c622e1b | 252 | case 1: wdt_osc = 500000; break; |
bogdanm | 19:398f4c622e1b | 253 | case 2: wdt_osc = 800000; break; |
bogdanm | 19:398f4c622e1b | 254 | case 3: wdt_osc = 1100000; break; |
bogdanm | 19:398f4c622e1b | 255 | case 4: wdt_osc = 1400000; break; |
bogdanm | 19:398f4c622e1b | 256 | case 5: wdt_osc = 1600000; break; |
bogdanm | 19:398f4c622e1b | 257 | case 6: wdt_osc = 1800000; break; |
bogdanm | 19:398f4c622e1b | 258 | case 7: wdt_osc = 2000000; break; |
bogdanm | 19:398f4c622e1b | 259 | case 8: wdt_osc = 2200000; break; |
bogdanm | 19:398f4c622e1b | 260 | case 9: wdt_osc = 2400000; break; |
bogdanm | 19:398f4c622e1b | 261 | case 10: wdt_osc = 2600000; break; |
bogdanm | 19:398f4c622e1b | 262 | case 11: wdt_osc = 2700000; break; |
bogdanm | 19:398f4c622e1b | 263 | case 12: wdt_osc = 2900000; break; |
bogdanm | 19:398f4c622e1b | 264 | case 13: wdt_osc = 3100000; break; |
bogdanm | 19:398f4c622e1b | 265 | case 14: wdt_osc = 3200000; break; |
bogdanm | 19:398f4c622e1b | 266 | case 15: wdt_osc = 3400000; break; |
bogdanm | 19:398f4c622e1b | 267 | } |
bogdanm | 19:398f4c622e1b | 268 | wdt_osc /= ((LPC_SYSCON->WDTOSCCTRL & 0x1F) << 1) + 2; |
bogdanm | 19:398f4c622e1b | 269 | |
bogdanm | 19:398f4c622e1b | 270 | switch (LPC_SYSCON->MAINCLKSEL & 0x03) { |
bogdanm | 19:398f4c622e1b | 271 | case 0: /* Internal RC oscillator */ |
bogdanm | 19:398f4c622e1b | 272 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 19:398f4c622e1b | 273 | break; |
bogdanm | 19:398f4c622e1b | 274 | case 1: /* Input Clock to System PLL */ |
bogdanm | 19:398f4c622e1b | 275 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
bogdanm | 19:398f4c622e1b | 276 | case 0: /* Internal RC oscillator */ |
bogdanm | 19:398f4c622e1b | 277 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 19:398f4c622e1b | 278 | break; |
bogdanm | 19:398f4c622e1b | 279 | case 1: /* System oscillator */ |
bogdanm | 19:398f4c622e1b | 280 | SystemCoreClock = __SYS_OSC_CLK; |
bogdanm | 19:398f4c622e1b | 281 | break; |
bogdanm | 19:398f4c622e1b | 282 | case 2: /* Reserved */ |
bogdanm | 19:398f4c622e1b | 283 | case 3: /* Reserved */ |
bogdanm | 19:398f4c622e1b | 284 | SystemCoreClock = 0; |
bogdanm | 19:398f4c622e1b | 285 | break; |
bogdanm | 19:398f4c622e1b | 286 | } |
bogdanm | 19:398f4c622e1b | 287 | break; |
bogdanm | 19:398f4c622e1b | 288 | case 2: /* WDT Oscillator */ |
bogdanm | 19:398f4c622e1b | 289 | SystemCoreClock = wdt_osc; |
bogdanm | 19:398f4c622e1b | 290 | break; |
bogdanm | 19:398f4c622e1b | 291 | case 3: /* System PLL Clock Out */ |
bogdanm | 19:398f4c622e1b | 292 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
bogdanm | 19:398f4c622e1b | 293 | case 0: /* Internal RC oscillator */ |
bogdanm | 19:398f4c622e1b | 294 | if (LPC_SYSCON->SYSPLLCTRL & 0x180) { |
bogdanm | 19:398f4c622e1b | 295 | SystemCoreClock = __IRC_OSC_CLK; |
bogdanm | 19:398f4c622e1b | 296 | } else { |
bogdanm | 19:398f4c622e1b | 297 | SystemCoreClock = __IRC_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
bogdanm | 19:398f4c622e1b | 298 | } |
bogdanm | 19:398f4c622e1b | 299 | break; |
bogdanm | 19:398f4c622e1b | 300 | case 1: /* System oscillator */ |
bogdanm | 19:398f4c622e1b | 301 | if (LPC_SYSCON->SYSPLLCTRL & 0x180) { |
bogdanm | 19:398f4c622e1b | 302 | SystemCoreClock = __SYS_OSC_CLK; |
bogdanm | 19:398f4c622e1b | 303 | } else { |
bogdanm | 19:398f4c622e1b | 304 | SystemCoreClock = __SYS_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
bogdanm | 19:398f4c622e1b | 305 | } |
bogdanm | 19:398f4c622e1b | 306 | break; |
bogdanm | 19:398f4c622e1b | 307 | case 2: /* Reserved */ |
bogdanm | 19:398f4c622e1b | 308 | case 3: /* Reserved */ |
bogdanm | 19:398f4c622e1b | 309 | SystemCoreClock = 0; |
bogdanm | 19:398f4c622e1b | 310 | break; |
bogdanm | 19:398f4c622e1b | 311 | } |
bogdanm | 19:398f4c622e1b | 312 | break; |
bogdanm | 19:398f4c622e1b | 313 | } |
bogdanm | 19:398f4c622e1b | 314 | |
bogdanm | 19:398f4c622e1b | 315 | SystemCoreClock /= LPC_SYSCON->SYSAHBCLKDIV; |
bogdanm | 19:398f4c622e1b | 316 | |
bogdanm | 19:398f4c622e1b | 317 | } |
bogdanm | 19:398f4c622e1b | 318 | |
bogdanm | 19:398f4c622e1b | 319 | /** |
bogdanm | 19:398f4c622e1b | 320 | * Initialize the system |
bogdanm | 19:398f4c622e1b | 321 | * |
bogdanm | 19:398f4c622e1b | 322 | * @param none |
bogdanm | 19:398f4c622e1b | 323 | * @return none |
bogdanm | 19:398f4c622e1b | 324 | * |
bogdanm | 19:398f4c622e1b | 325 | * @brief Setup the microcontroller system. |
bogdanm | 19:398f4c622e1b | 326 | * Initialize the System. |
bogdanm | 19:398f4c622e1b | 327 | */ |
bogdanm | 19:398f4c622e1b | 328 | void SystemInit (void) { |
bogdanm | 19:398f4c622e1b | 329 | volatile uint32_t i; |
bogdanm | 19:398f4c622e1b | 330 | |
bogdanm | 19:398f4c622e1b | 331 | #if (CLOCK_SETUP) /* Clock Setup */ |
bogdanm | 19:398f4c622e1b | 332 | |
bogdanm | 19:398f4c622e1b | 333 | #if ((SYSPLLCLKSEL_Val & 0x03) == 1) |
bogdanm | 19:398f4c622e1b | 334 | LPC_SYSCON->PDRUNCFG &= ~(1 << 5); /* Power-up System Osc */ |
bogdanm | 19:398f4c622e1b | 335 | LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val; |
bogdanm | 19:398f4c622e1b | 336 | for (i = 0; i < 200; i++) __NOP(); |
bogdanm | 19:398f4c622e1b | 337 | #endif |
bogdanm | 19:398f4c622e1b | 338 | |
bogdanm | 19:398f4c622e1b | 339 | LPC_SYSCON->SYSPLLCLKSEL = SYSPLLCLKSEL_Val; /* Select PLL Input */ |
bogdanm | 19:398f4c622e1b | 340 | LPC_SYSCON->SYSPLLCLKUEN = 0x01; /* Update Clock Source */ |
bogdanm | 19:398f4c622e1b | 341 | LPC_SYSCON->SYSPLLCLKUEN = 0x00; /* Toggle Update Register */ |
bogdanm | 19:398f4c622e1b | 342 | LPC_SYSCON->SYSPLLCLKUEN = 0x01; |
bogdanm | 19:398f4c622e1b | 343 | while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); /* Wait Until Updated */ |
bogdanm | 19:398f4c622e1b | 344 | #if ((MAINCLKSEL_Val & 0x03) == 3) /* Main Clock is PLL Out */ |
bogdanm | 19:398f4c622e1b | 345 | LPC_SYSCON->SYSPLLCTRL = SYSPLLCTRL_Val; |
bogdanm | 19:398f4c622e1b | 346 | LPC_SYSCON->PDRUNCFG &= ~(1 << 7); /* Power-up SYSPLL */ |
bogdanm | 19:398f4c622e1b | 347 | while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */ |
bogdanm | 19:398f4c622e1b | 348 | #endif |
bogdanm | 19:398f4c622e1b | 349 | |
bogdanm | 19:398f4c622e1b | 350 | #if (((MAINCLKSEL_Val & 0x03) == 2) ) |
bogdanm | 19:398f4c622e1b | 351 | LPC_SYSCON->WDTOSCCTRL = WDTOSCCTRL_Val; |
bogdanm | 19:398f4c622e1b | 352 | LPC_SYSCON->PDRUNCFG &= ~(1 << 6); /* Power-up WDT Clock */ |
bogdanm | 19:398f4c622e1b | 353 | for (i = 0; i < 200; i++) __NOP(); |
bogdanm | 19:398f4c622e1b | 354 | #endif |
bogdanm | 19:398f4c622e1b | 355 | |
bogdanm | 19:398f4c622e1b | 356 | LPC_SYSCON->MAINCLKSEL = MAINCLKSEL_Val; /* Select PLL Clock Output */ |
bogdanm | 19:398f4c622e1b | 357 | LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */ |
bogdanm | 19:398f4c622e1b | 358 | LPC_SYSCON->MAINCLKUEN = 0x00; /* Toggle Update Register */ |
bogdanm | 19:398f4c622e1b | 359 | LPC_SYSCON->MAINCLKUEN = 0x01; |
bogdanm | 19:398f4c622e1b | 360 | while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */ |
bogdanm | 19:398f4c622e1b | 361 | |
bogdanm | 19:398f4c622e1b | 362 | LPC_SYSCON->SYSAHBCLKDIV = SYSAHBCLKDIV_Val; |
bogdanm | 19:398f4c622e1b | 363 | #endif |
bogdanm | 19:398f4c622e1b | 364 | /* System clock to the IOCON needs to be enabled or |
bogdanm | 19:398f4c622e1b | 365 | most of the I/O related peripherals won't work. */ |
bogdanm | 19:398f4c622e1b | 366 | LPC_SYSCON->SYSAHBCLKCTRL |= (1<<16); |
bogdanm | 19:398f4c622e1b | 367 | } |