mbed library sources
Dependents: frdm_kl05z_gpio_test
Fork of mbed-src by
vendor/NXP/LPC812/cmsis/system_LPC8xx.c@10:3bc89ef62ce7, 2013-06-14 (annotated)
- Committer:
- emilmont
- Date:
- Fri Jun 14 17:49:17 2013 +0100
- Revision:
- 10:3bc89ef62ce7
Unify mbed library sources
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 10:3bc89ef62ce7 | 1 | /****************************************************************************** |
emilmont | 10:3bc89ef62ce7 | 2 | * @file: system_LPC8xx.c |
emilmont | 10:3bc89ef62ce7 | 3 | * @purpose: CMSIS Cortex-M0+ Device Peripheral Access Layer Source File |
emilmont | 10:3bc89ef62ce7 | 4 | * for the NXP LPC8xx Device Series |
emilmont | 10:3bc89ef62ce7 | 5 | * @version: V1.0 |
emilmont | 10:3bc89ef62ce7 | 6 | * @date: 16. Aug. 2012 |
emilmont | 10:3bc89ef62ce7 | 7 | *---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 8 | * |
emilmont | 10:3bc89ef62ce7 | 9 | * Copyright (C) 2012 ARM Limited. All rights reserved. |
emilmont | 10:3bc89ef62ce7 | 10 | * |
emilmont | 10:3bc89ef62ce7 | 11 | * ARM Limited (ARM) is supplying this software for use with Cortex-M0+ |
emilmont | 10:3bc89ef62ce7 | 12 | * processor based microcontrollers. This file can be freely distributed |
emilmont | 10:3bc89ef62ce7 | 13 | * within development tools that are supporting such ARM based processors. |
emilmont | 10:3bc89ef62ce7 | 14 | * |
emilmont | 10:3bc89ef62ce7 | 15 | * THIS SOFTWARE IS PROVIDED "AS IS". NO WARRANTIES, WHETHER EXPRESS, IMPLIED |
emilmont | 10:3bc89ef62ce7 | 16 | * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF |
emilmont | 10:3bc89ef62ce7 | 17 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. |
emilmont | 10:3bc89ef62ce7 | 18 | * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR |
emilmont | 10:3bc89ef62ce7 | 19 | * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER. |
emilmont | 10:3bc89ef62ce7 | 20 | * |
emilmont | 10:3bc89ef62ce7 | 21 | ******************************************************************************/ |
emilmont | 10:3bc89ef62ce7 | 22 | #include <stdint.h> |
emilmont | 10:3bc89ef62ce7 | 23 | #include "LPC8xx.h" |
emilmont | 10:3bc89ef62ce7 | 24 | |
emilmont | 10:3bc89ef62ce7 | 25 | /* |
emilmont | 10:3bc89ef62ce7 | 26 | //-------- <<< Use Configuration Wizard in Context Menu >>> ------------------ |
emilmont | 10:3bc89ef62ce7 | 27 | */ |
emilmont | 10:3bc89ef62ce7 | 28 | |
emilmont | 10:3bc89ef62ce7 | 29 | /*--------------------- Clock Configuration ---------------------------------- |
emilmont | 10:3bc89ef62ce7 | 30 | // |
emilmont | 10:3bc89ef62ce7 | 31 | // <e> Clock Configuration |
emilmont | 10:3bc89ef62ce7 | 32 | // <h> System Oscillator Control Register (SYSOSCCTRL) |
emilmont | 10:3bc89ef62ce7 | 33 | // <o1.0> BYPASS: System Oscillator Bypass Enable |
emilmont | 10:3bc89ef62ce7 | 34 | // <i> If enabled then PLL input (sys_osc_clk) is fed |
emilmont | 10:3bc89ef62ce7 | 35 | // <i> directly from XTALIN and XTALOUT pins. |
emilmont | 10:3bc89ef62ce7 | 36 | // <o1.9> FREQRANGE: System Oscillator Frequency Range |
emilmont | 10:3bc89ef62ce7 | 37 | // <i> Determines frequency range for Low-power oscillator. |
emilmont | 10:3bc89ef62ce7 | 38 | // <0=> 1 - 20 MHz |
emilmont | 10:3bc89ef62ce7 | 39 | // <1=> 15 - 25 MHz |
emilmont | 10:3bc89ef62ce7 | 40 | // </h> |
emilmont | 10:3bc89ef62ce7 | 41 | // |
emilmont | 10:3bc89ef62ce7 | 42 | // <h> Watchdog Oscillator Control Register (WDTOSCCTRL) |
emilmont | 10:3bc89ef62ce7 | 43 | // <o2.0..4> DIVSEL: Select Divider for Fclkana |
emilmont | 10:3bc89ef62ce7 | 44 | // <i> wdt_osc_clk = Fclkana/ (2 × (1 + DIVSEL)) |
emilmont | 10:3bc89ef62ce7 | 45 | // <0-31> |
emilmont | 10:3bc89ef62ce7 | 46 | // <o2.5..8> FREQSEL: Select Watchdog Oscillator Analog Output Frequency (Fclkana) |
emilmont | 10:3bc89ef62ce7 | 47 | // <0=> Undefined |
emilmont | 10:3bc89ef62ce7 | 48 | // <1=> 0.5 MHz |
emilmont | 10:3bc89ef62ce7 | 49 | // <2=> 0.8 MHz |
emilmont | 10:3bc89ef62ce7 | 50 | // <3=> 1.1 MHz |
emilmont | 10:3bc89ef62ce7 | 51 | // <4=> 1.4 MHz |
emilmont | 10:3bc89ef62ce7 | 52 | // <5=> 1.6 MHz |
emilmont | 10:3bc89ef62ce7 | 53 | // <6=> 1.8 MHz |
emilmont | 10:3bc89ef62ce7 | 54 | // <7=> 2.0 MHz |
emilmont | 10:3bc89ef62ce7 | 55 | // <8=> 2.2 MHz |
emilmont | 10:3bc89ef62ce7 | 56 | // <9=> 2.4 MHz |
emilmont | 10:3bc89ef62ce7 | 57 | // <10=> 2.6 MHz |
emilmont | 10:3bc89ef62ce7 | 58 | // <11=> 2.7 MHz |
emilmont | 10:3bc89ef62ce7 | 59 | // <12=> 2.9 MHz |
emilmont | 10:3bc89ef62ce7 | 60 | // <13=> 3.1 MHz |
emilmont | 10:3bc89ef62ce7 | 61 | // <14=> 3.2 MHz |
emilmont | 10:3bc89ef62ce7 | 62 | // <15=> 3.4 MHz |
emilmont | 10:3bc89ef62ce7 | 63 | // </h> |
emilmont | 10:3bc89ef62ce7 | 64 | // |
emilmont | 10:3bc89ef62ce7 | 65 | // <h> System PLL Control Register (SYSPLLCTRL) |
emilmont | 10:3bc89ef62ce7 | 66 | // <i> F_clkout = M * F_clkin = F_CCO / (2 * P) |
emilmont | 10:3bc89ef62ce7 | 67 | // <i> F_clkin must be in the range of 10 MHz to 25 MHz |
emilmont | 10:3bc89ef62ce7 | 68 | // <i> F_CCO must be in the range of 156 MHz to 320 MHz |
emilmont | 10:3bc89ef62ce7 | 69 | // <o3.0..4> MSEL: Feedback Divider Selection |
emilmont | 10:3bc89ef62ce7 | 70 | // <i> M = MSEL + 1 |
emilmont | 10:3bc89ef62ce7 | 71 | // <0-31> |
emilmont | 10:3bc89ef62ce7 | 72 | // <o3.5..6> PSEL: Post Divider Selection |
emilmont | 10:3bc89ef62ce7 | 73 | // <0=> P = 1 |
emilmont | 10:3bc89ef62ce7 | 74 | // <1=> P = 2 |
emilmont | 10:3bc89ef62ce7 | 75 | // <2=> P = 4 |
emilmont | 10:3bc89ef62ce7 | 76 | // <3=> P = 8 |
emilmont | 10:3bc89ef62ce7 | 77 | // </h> |
emilmont | 10:3bc89ef62ce7 | 78 | // |
emilmont | 10:3bc89ef62ce7 | 79 | // <h> System PLL Clock Source Select Register (SYSPLLCLKSEL) |
emilmont | 10:3bc89ef62ce7 | 80 | // <o4.0..1> SEL: System PLL Clock Source |
emilmont | 10:3bc89ef62ce7 | 81 | // <0=> IRC Oscillator |
emilmont | 10:3bc89ef62ce7 | 82 | // <1=> System Oscillator |
emilmont | 10:3bc89ef62ce7 | 83 | // <2=> Reserved |
emilmont | 10:3bc89ef62ce7 | 84 | // <3=> CLKIN pin |
emilmont | 10:3bc89ef62ce7 | 85 | // </h> |
emilmont | 10:3bc89ef62ce7 | 86 | // |
emilmont | 10:3bc89ef62ce7 | 87 | // <h> Main Clock Source Select Register (MAINCLKSEL) |
emilmont | 10:3bc89ef62ce7 | 88 | // <o5.0..1> SEL: Clock Source for Main Clock |
emilmont | 10:3bc89ef62ce7 | 89 | // <0=> IRC Oscillator |
emilmont | 10:3bc89ef62ce7 | 90 | // <1=> Input Clock to System PLL |
emilmont | 10:3bc89ef62ce7 | 91 | // <2=> WDT Oscillator |
emilmont | 10:3bc89ef62ce7 | 92 | // <3=> System PLL Clock Out |
emilmont | 10:3bc89ef62ce7 | 93 | // </h> |
emilmont | 10:3bc89ef62ce7 | 94 | // |
emilmont | 10:3bc89ef62ce7 | 95 | // <h> System AHB Clock Divider Register (SYSAHBCLKDIV) |
emilmont | 10:3bc89ef62ce7 | 96 | // <o6.0..7> DIV: System AHB Clock Divider |
emilmont | 10:3bc89ef62ce7 | 97 | // <i> Divides main clock to provide system clock to core, memories, and peripherals. |
emilmont | 10:3bc89ef62ce7 | 98 | // <i> 0 = is disabled |
emilmont | 10:3bc89ef62ce7 | 99 | // <0-255> |
emilmont | 10:3bc89ef62ce7 | 100 | // </h> |
emilmont | 10:3bc89ef62ce7 | 101 | // </e> |
emilmont | 10:3bc89ef62ce7 | 102 | */ |
emilmont | 10:3bc89ef62ce7 | 103 | #define CLOCK_SETUP 1 |
emilmont | 10:3bc89ef62ce7 | 104 | #define SYSOSCCTRL_Val 0x00000000 // Reset: 0x000 |
emilmont | 10:3bc89ef62ce7 | 105 | #define WDTOSCCTRL_Val 0x00000000 // Reset: 0x000 |
emilmont | 10:3bc89ef62ce7 | 106 | #define SYSPLLCTRL_Val 0x00000041 // Reset: 0x000 |
emilmont | 10:3bc89ef62ce7 | 107 | #define SYSPLLCLKSEL_Val 0x00000000 // Reset: 0x000 |
emilmont | 10:3bc89ef62ce7 | 108 | #define MAINCLKSEL_Val 0x00000000 // Reset: 0x000 |
emilmont | 10:3bc89ef62ce7 | 109 | #define SYSAHBCLKDIV_Val 0x00000001 // Reset: 0x001 |
emilmont | 10:3bc89ef62ce7 | 110 | |
emilmont | 10:3bc89ef62ce7 | 111 | /* |
emilmont | 10:3bc89ef62ce7 | 112 | //-------- <<< end of configuration section >>> ------------------------------ |
emilmont | 10:3bc89ef62ce7 | 113 | */ |
emilmont | 10:3bc89ef62ce7 | 114 | |
emilmont | 10:3bc89ef62ce7 | 115 | /*---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 116 | Check the register settings |
emilmont | 10:3bc89ef62ce7 | 117 | *----------------------------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 118 | #define CHECK_RANGE(val, min, max) ((val < min) || (val > max)) |
emilmont | 10:3bc89ef62ce7 | 119 | #define CHECK_RSVD(val, mask) (val & mask) |
emilmont | 10:3bc89ef62ce7 | 120 | |
emilmont | 10:3bc89ef62ce7 | 121 | /* Clock Configuration -------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 122 | #if (CHECK_RSVD((SYSOSCCTRL_Val), ~0x00000003)) |
emilmont | 10:3bc89ef62ce7 | 123 | #error "SYSOSCCTRL: Invalid values of reserved bits!" |
emilmont | 10:3bc89ef62ce7 | 124 | #endif |
emilmont | 10:3bc89ef62ce7 | 125 | |
emilmont | 10:3bc89ef62ce7 | 126 | #if (CHECK_RSVD((WDTOSCCTRL_Val), ~0x000001FF)) |
emilmont | 10:3bc89ef62ce7 | 127 | #error "WDTOSCCTRL: Invalid values of reserved bits!" |
emilmont | 10:3bc89ef62ce7 | 128 | #endif |
emilmont | 10:3bc89ef62ce7 | 129 | |
emilmont | 10:3bc89ef62ce7 | 130 | #if (CHECK_RANGE((SYSPLLCLKSEL_Val), 0, 3)) |
emilmont | 10:3bc89ef62ce7 | 131 | #error "SYSPLLCLKSEL: Value out of range!" |
emilmont | 10:3bc89ef62ce7 | 132 | #endif |
emilmont | 10:3bc89ef62ce7 | 133 | |
emilmont | 10:3bc89ef62ce7 | 134 | #if (CHECK_RSVD((SYSPLLCTRL_Val), ~0x000001FF)) |
emilmont | 10:3bc89ef62ce7 | 135 | #error "SYSPLLCTRL: Invalid values of reserved bits!" |
emilmont | 10:3bc89ef62ce7 | 136 | #endif |
emilmont | 10:3bc89ef62ce7 | 137 | |
emilmont | 10:3bc89ef62ce7 | 138 | #if (CHECK_RSVD((MAINCLKSEL_Val), ~0x00000003)) |
emilmont | 10:3bc89ef62ce7 | 139 | #error "MAINCLKSEL: Invalid values of reserved bits!" |
emilmont | 10:3bc89ef62ce7 | 140 | #endif |
emilmont | 10:3bc89ef62ce7 | 141 | |
emilmont | 10:3bc89ef62ce7 | 142 | #if (CHECK_RANGE((SYSAHBCLKDIV_Val), 0, 255)) |
emilmont | 10:3bc89ef62ce7 | 143 | #error "SYSAHBCLKDIV: Value out of range!" |
emilmont | 10:3bc89ef62ce7 | 144 | #endif |
emilmont | 10:3bc89ef62ce7 | 145 | |
emilmont | 10:3bc89ef62ce7 | 146 | |
emilmont | 10:3bc89ef62ce7 | 147 | /*---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 148 | DEFINES |
emilmont | 10:3bc89ef62ce7 | 149 | *----------------------------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 150 | |
emilmont | 10:3bc89ef62ce7 | 151 | /*---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 152 | Define clocks |
emilmont | 10:3bc89ef62ce7 | 153 | *----------------------------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 154 | #define __XTAL (12000000UL) /* Oscillator frequency */ |
emilmont | 10:3bc89ef62ce7 | 155 | #define __SYS_OSC_CLK ( __XTAL) /* Main oscillator frequency */ |
emilmont | 10:3bc89ef62ce7 | 156 | #define __IRC_OSC_CLK (12000000UL) /* Internal RC oscillator frequency */ |
emilmont | 10:3bc89ef62ce7 | 157 | #define __CLKIN_CLK (12000000UL) /* CLKIN pin frequency */ |
emilmont | 10:3bc89ef62ce7 | 158 | |
emilmont | 10:3bc89ef62ce7 | 159 | |
emilmont | 10:3bc89ef62ce7 | 160 | #define __FREQSEL ((WDTOSCCTRL_Val >> 5) & 0x0F) |
emilmont | 10:3bc89ef62ce7 | 161 | #define __DIVSEL (((WDTOSCCTRL_Val & 0x1F) << 1) + 2) |
emilmont | 10:3bc89ef62ce7 | 162 | |
emilmont | 10:3bc89ef62ce7 | 163 | #if (CLOCK_SETUP) /* Clock Setup */ |
emilmont | 10:3bc89ef62ce7 | 164 | #if (__FREQSEL == 0) |
emilmont | 10:3bc89ef62ce7 | 165 | #define __WDT_OSC_CLK ( 0) /* undefined */ |
emilmont | 10:3bc89ef62ce7 | 166 | #elif (__FREQSEL == 1) |
emilmont | 10:3bc89ef62ce7 | 167 | #define __WDT_OSC_CLK ( 500000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 168 | #elif (__FREQSEL == 2) |
emilmont | 10:3bc89ef62ce7 | 169 | #define __WDT_OSC_CLK ( 800000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 170 | #elif (__FREQSEL == 3) |
emilmont | 10:3bc89ef62ce7 | 171 | #define __WDT_OSC_CLK (1100000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 172 | #elif (__FREQSEL == 4) |
emilmont | 10:3bc89ef62ce7 | 173 | #define __WDT_OSC_CLK (1400000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 174 | #elif (__FREQSEL == 5) |
emilmont | 10:3bc89ef62ce7 | 175 | #define __WDT_OSC_CLK (1600000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 176 | #elif (__FREQSEL == 6) |
emilmont | 10:3bc89ef62ce7 | 177 | #define __WDT_OSC_CLK (1800000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 178 | #elif (__FREQSEL == 7) |
emilmont | 10:3bc89ef62ce7 | 179 | #define __WDT_OSC_CLK (2000000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 180 | #elif (__FREQSEL == 8) |
emilmont | 10:3bc89ef62ce7 | 181 | #define __WDT_OSC_CLK (2200000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 182 | #elif (__FREQSEL == 9) |
emilmont | 10:3bc89ef62ce7 | 183 | #define __WDT_OSC_CLK (2400000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 184 | #elif (__FREQSEL == 10) |
emilmont | 10:3bc89ef62ce7 | 185 | #define __WDT_OSC_CLK (2600000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 186 | #elif (__FREQSEL == 11) |
emilmont | 10:3bc89ef62ce7 | 187 | #define __WDT_OSC_CLK (2700000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 188 | #elif (__FREQSEL == 12) |
emilmont | 10:3bc89ef62ce7 | 189 | #define __WDT_OSC_CLK (2900000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 190 | #elif (__FREQSEL == 13) |
emilmont | 10:3bc89ef62ce7 | 191 | #define __WDT_OSC_CLK (3100000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 192 | #elif (__FREQSEL == 14) |
emilmont | 10:3bc89ef62ce7 | 193 | #define __WDT_OSC_CLK (3200000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 194 | #else |
emilmont | 10:3bc89ef62ce7 | 195 | #define __WDT_OSC_CLK (3400000 / __DIVSEL) |
emilmont | 10:3bc89ef62ce7 | 196 | #endif |
emilmont | 10:3bc89ef62ce7 | 197 | |
emilmont | 10:3bc89ef62ce7 | 198 | /* sys_pllclkin calculation */ |
emilmont | 10:3bc89ef62ce7 | 199 | #if ((SYSPLLCLKSEL_Val & 0x03) == 0) |
emilmont | 10:3bc89ef62ce7 | 200 | #define __SYS_PLLCLKIN (__IRC_OSC_CLK) |
emilmont | 10:3bc89ef62ce7 | 201 | #elif ((SYSPLLCLKSEL_Val & 0x03) == 1) |
emilmont | 10:3bc89ef62ce7 | 202 | #define __SYS_PLLCLKIN (__SYS_OSC_CLK) |
emilmont | 10:3bc89ef62ce7 | 203 | #elif ((SYSPLLCLKSEL_Val & 0x03) == 3) |
emilmont | 10:3bc89ef62ce7 | 204 | #define __SYS_PLLCLKIN (__CLKIN_CLK) |
emilmont | 10:3bc89ef62ce7 | 205 | #else |
emilmont | 10:3bc89ef62ce7 | 206 | #define __SYS_PLLCLKIN (0) |
emilmont | 10:3bc89ef62ce7 | 207 | #endif |
emilmont | 10:3bc89ef62ce7 | 208 | |
emilmont | 10:3bc89ef62ce7 | 209 | #define __SYS_PLLCLKOUT (__SYS_PLLCLKIN * ((SYSPLLCTRL_Val & 0x01F) + 1)) |
emilmont | 10:3bc89ef62ce7 | 210 | |
emilmont | 10:3bc89ef62ce7 | 211 | /* main clock calculation */ |
emilmont | 10:3bc89ef62ce7 | 212 | #if ((MAINCLKSEL_Val & 0x03) == 0) |
emilmont | 10:3bc89ef62ce7 | 213 | #define __MAIN_CLOCK (__IRC_OSC_CLK) |
emilmont | 10:3bc89ef62ce7 | 214 | #elif ((MAINCLKSEL_Val & 0x03) == 1) |
emilmont | 10:3bc89ef62ce7 | 215 | #define __MAIN_CLOCK (__SYS_PLLCLKIN) |
emilmont | 10:3bc89ef62ce7 | 216 | #elif ((MAINCLKSEL_Val & 0x03) == 2) |
emilmont | 10:3bc89ef62ce7 | 217 | #if (__FREQSEL == 0) |
emilmont | 10:3bc89ef62ce7 | 218 | #error "MAINCLKSEL: WDT Oscillator selected but FREQSEL is undefined!" |
emilmont | 10:3bc89ef62ce7 | 219 | #else |
emilmont | 10:3bc89ef62ce7 | 220 | #define __MAIN_CLOCK (__WDT_OSC_CLK) |
emilmont | 10:3bc89ef62ce7 | 221 | #endif |
emilmont | 10:3bc89ef62ce7 | 222 | #elif ((MAINCLKSEL_Val & 0x03) == 3) |
emilmont | 10:3bc89ef62ce7 | 223 | #define __MAIN_CLOCK (__SYS_PLLCLKOUT) |
emilmont | 10:3bc89ef62ce7 | 224 | #else |
emilmont | 10:3bc89ef62ce7 | 225 | #define __MAIN_CLOCK (0) |
emilmont | 10:3bc89ef62ce7 | 226 | #endif |
emilmont | 10:3bc89ef62ce7 | 227 | |
emilmont | 10:3bc89ef62ce7 | 228 | #define __SYSTEM_CLOCK (__MAIN_CLOCK / SYSAHBCLKDIV_Val) |
emilmont | 10:3bc89ef62ce7 | 229 | |
emilmont | 10:3bc89ef62ce7 | 230 | #else |
emilmont | 10:3bc89ef62ce7 | 231 | #define __SYSTEM_CLOCK (__IRC_OSC_CLK) |
emilmont | 10:3bc89ef62ce7 | 232 | #endif // CLOCK_SETUP |
emilmont | 10:3bc89ef62ce7 | 233 | |
emilmont | 10:3bc89ef62ce7 | 234 | |
emilmont | 10:3bc89ef62ce7 | 235 | /*---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 236 | Clock Variable definitions |
emilmont | 10:3bc89ef62ce7 | 237 | *----------------------------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 238 | uint32_t SystemCoreClock = __SYSTEM_CLOCK;/*!< System Clock Frequency (Core Clock)*/ |
emilmont | 10:3bc89ef62ce7 | 239 | |
emilmont | 10:3bc89ef62ce7 | 240 | |
emilmont | 10:3bc89ef62ce7 | 241 | /*---------------------------------------------------------------------------- |
emilmont | 10:3bc89ef62ce7 | 242 | Clock functions |
emilmont | 10:3bc89ef62ce7 | 243 | *----------------------------------------------------------------------------*/ |
emilmont | 10:3bc89ef62ce7 | 244 | void SystemCoreClockUpdate (void) /* Get Core Clock Frequency */ |
emilmont | 10:3bc89ef62ce7 | 245 | { |
emilmont | 10:3bc89ef62ce7 | 246 | uint32_t wdt_osc = 0; |
emilmont | 10:3bc89ef62ce7 | 247 | |
emilmont | 10:3bc89ef62ce7 | 248 | /* Determine clock frequency according to clock register values */ |
emilmont | 10:3bc89ef62ce7 | 249 | switch ((LPC_SYSCON->WDTOSCCTRL >> 5) & 0x0F) { |
emilmont | 10:3bc89ef62ce7 | 250 | case 0: wdt_osc = 0; break; |
emilmont | 10:3bc89ef62ce7 | 251 | case 1: wdt_osc = 500000; break; |
emilmont | 10:3bc89ef62ce7 | 252 | case 2: wdt_osc = 800000; break; |
emilmont | 10:3bc89ef62ce7 | 253 | case 3: wdt_osc = 1100000; break; |
emilmont | 10:3bc89ef62ce7 | 254 | case 4: wdt_osc = 1400000; break; |
emilmont | 10:3bc89ef62ce7 | 255 | case 5: wdt_osc = 1600000; break; |
emilmont | 10:3bc89ef62ce7 | 256 | case 6: wdt_osc = 1800000; break; |
emilmont | 10:3bc89ef62ce7 | 257 | case 7: wdt_osc = 2000000; break; |
emilmont | 10:3bc89ef62ce7 | 258 | case 8: wdt_osc = 2200000; break; |
emilmont | 10:3bc89ef62ce7 | 259 | case 9: wdt_osc = 2400000; break; |
emilmont | 10:3bc89ef62ce7 | 260 | case 10: wdt_osc = 2600000; break; |
emilmont | 10:3bc89ef62ce7 | 261 | case 11: wdt_osc = 2700000; break; |
emilmont | 10:3bc89ef62ce7 | 262 | case 12: wdt_osc = 2900000; break; |
emilmont | 10:3bc89ef62ce7 | 263 | case 13: wdt_osc = 3100000; break; |
emilmont | 10:3bc89ef62ce7 | 264 | case 14: wdt_osc = 3200000; break; |
emilmont | 10:3bc89ef62ce7 | 265 | case 15: wdt_osc = 3400000; break; |
emilmont | 10:3bc89ef62ce7 | 266 | } |
emilmont | 10:3bc89ef62ce7 | 267 | wdt_osc /= ((LPC_SYSCON->WDTOSCCTRL & 0x1F) << 1) + 2; |
emilmont | 10:3bc89ef62ce7 | 268 | |
emilmont | 10:3bc89ef62ce7 | 269 | switch (LPC_SYSCON->MAINCLKSEL & 0x03) { |
emilmont | 10:3bc89ef62ce7 | 270 | case 0: /* Internal RC oscillator */ |
emilmont | 10:3bc89ef62ce7 | 271 | SystemCoreClock = __IRC_OSC_CLK; |
emilmont | 10:3bc89ef62ce7 | 272 | break; |
emilmont | 10:3bc89ef62ce7 | 273 | case 1: /* Input Clock to System PLL */ |
emilmont | 10:3bc89ef62ce7 | 274 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
emilmont | 10:3bc89ef62ce7 | 275 | case 0: /* Internal RC oscillator */ |
emilmont | 10:3bc89ef62ce7 | 276 | SystemCoreClock = __IRC_OSC_CLK; |
emilmont | 10:3bc89ef62ce7 | 277 | break; |
emilmont | 10:3bc89ef62ce7 | 278 | case 1: /* System oscillator */ |
emilmont | 10:3bc89ef62ce7 | 279 | SystemCoreClock = __SYS_OSC_CLK; |
emilmont | 10:3bc89ef62ce7 | 280 | break; |
emilmont | 10:3bc89ef62ce7 | 281 | case 2: /* Reserved */ |
emilmont | 10:3bc89ef62ce7 | 282 | SystemCoreClock = 0; |
emilmont | 10:3bc89ef62ce7 | 283 | break; |
emilmont | 10:3bc89ef62ce7 | 284 | case 3: /* CLKIN pin */ |
emilmont | 10:3bc89ef62ce7 | 285 | SystemCoreClock = __CLKIN_CLK; |
emilmont | 10:3bc89ef62ce7 | 286 | break; |
emilmont | 10:3bc89ef62ce7 | 287 | } |
emilmont | 10:3bc89ef62ce7 | 288 | break; |
emilmont | 10:3bc89ef62ce7 | 289 | case 2: /* WDT Oscillator */ |
emilmont | 10:3bc89ef62ce7 | 290 | SystemCoreClock = wdt_osc; |
emilmont | 10:3bc89ef62ce7 | 291 | break; |
emilmont | 10:3bc89ef62ce7 | 292 | case 3: /* System PLL Clock Out */ |
emilmont | 10:3bc89ef62ce7 | 293 | switch (LPC_SYSCON->SYSPLLCLKSEL & 0x03) { |
emilmont | 10:3bc89ef62ce7 | 294 | case 0: /* Internal RC oscillator */ |
emilmont | 10:3bc89ef62ce7 | 295 | SystemCoreClock = __IRC_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
emilmont | 10:3bc89ef62ce7 | 296 | break; |
emilmont | 10:3bc89ef62ce7 | 297 | case 1: /* System oscillator */ |
emilmont | 10:3bc89ef62ce7 | 298 | SystemCoreClock = __SYS_OSC_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
emilmont | 10:3bc89ef62ce7 | 299 | break; |
emilmont | 10:3bc89ef62ce7 | 300 | case 2: /* Reserved */ |
emilmont | 10:3bc89ef62ce7 | 301 | SystemCoreClock = 0; |
emilmont | 10:3bc89ef62ce7 | 302 | break; |
emilmont | 10:3bc89ef62ce7 | 303 | case 3: /* CLKIN pin */ |
emilmont | 10:3bc89ef62ce7 | 304 | SystemCoreClock = __CLKIN_CLK * ((LPC_SYSCON->SYSPLLCTRL & 0x01F) + 1); |
emilmont | 10:3bc89ef62ce7 | 305 | break; |
emilmont | 10:3bc89ef62ce7 | 306 | } |
emilmont | 10:3bc89ef62ce7 | 307 | break; |
emilmont | 10:3bc89ef62ce7 | 308 | } |
emilmont | 10:3bc89ef62ce7 | 309 | |
emilmont | 10:3bc89ef62ce7 | 310 | SystemCoreClock /= LPC_SYSCON->SYSAHBCLKDIV; |
emilmont | 10:3bc89ef62ce7 | 311 | |
emilmont | 10:3bc89ef62ce7 | 312 | } |
emilmont | 10:3bc89ef62ce7 | 313 | |
emilmont | 10:3bc89ef62ce7 | 314 | /** |
emilmont | 10:3bc89ef62ce7 | 315 | * Initialize the system |
emilmont | 10:3bc89ef62ce7 | 316 | * |
emilmont | 10:3bc89ef62ce7 | 317 | * @param none |
emilmont | 10:3bc89ef62ce7 | 318 | * @return none |
emilmont | 10:3bc89ef62ce7 | 319 | * |
emilmont | 10:3bc89ef62ce7 | 320 | * @brief Setup the microcontroller system. |
emilmont | 10:3bc89ef62ce7 | 321 | * Initialize the System. |
emilmont | 10:3bc89ef62ce7 | 322 | */ |
emilmont | 10:3bc89ef62ce7 | 323 | void SystemInit (void) { |
emilmont | 10:3bc89ef62ce7 | 324 | volatile uint32_t i; |
emilmont | 10:3bc89ef62ce7 | 325 | |
emilmont | 10:3bc89ef62ce7 | 326 | /* System clock to the IOCON & the SWM need to be enabled or |
emilmont | 10:3bc89ef62ce7 | 327 | most of the I/O related peripherals won't work. */ |
emilmont | 10:3bc89ef62ce7 | 328 | LPC_SYSCON->SYSAHBCLKCTRL |= ( (0x1 << 7) | (0x1 << 18) ); |
emilmont | 10:3bc89ef62ce7 | 329 | |
emilmont | 10:3bc89ef62ce7 | 330 | #if (CLOCK_SETUP) /* Clock Setup */ |
emilmont | 10:3bc89ef62ce7 | 331 | |
emilmont | 10:3bc89ef62ce7 | 332 | #if ((SYSPLLCLKSEL_Val & 0x03) == 1) |
emilmont | 10:3bc89ef62ce7 | 333 | LPC_IOCON->PIO0_8 &= ~(0x3 << 3); |
emilmont | 10:3bc89ef62ce7 | 334 | LPC_IOCON->PIO0_9 &= ~(0x3 << 3); |
emilmont | 10:3bc89ef62ce7 | 335 | LPC_SWM->PINENABLE0 &= ~(0x3 << 4); |
emilmont | 10:3bc89ef62ce7 | 336 | LPC_SYSCON->PDRUNCFG &= ~(0x1 << 5); /* Power-up System Osc */ |
emilmont | 10:3bc89ef62ce7 | 337 | LPC_SYSCON->SYSOSCCTRL = SYSOSCCTRL_Val; |
emilmont | 10:3bc89ef62ce7 | 338 | for (i = 0; i < 200; i++) __NOP(); |
emilmont | 10:3bc89ef62ce7 | 339 | #endif |
emilmont | 10:3bc89ef62ce7 | 340 | #if ((SYSPLLCLKSEL_Val & 0x03) == 3) |
emilmont | 10:3bc89ef62ce7 | 341 | LPC_IOCON->PIO0_1 &= ~(0x3 << 3); |
emilmont | 10:3bc89ef62ce7 | 342 | LPC_SWM->PINENABLE0 &= ~(0x1 << 7); |
emilmont | 10:3bc89ef62ce7 | 343 | for (i = 0; i < 200; i++) __NOP(); |
emilmont | 10:3bc89ef62ce7 | 344 | #endif |
emilmont | 10:3bc89ef62ce7 | 345 | |
emilmont | 10:3bc89ef62ce7 | 346 | LPC_SYSCON->SYSPLLCLKSEL = SYSPLLCLKSEL_Val; /* Select PLL Input */ |
emilmont | 10:3bc89ef62ce7 | 347 | LPC_SYSCON->SYSPLLCLKUEN = 0x01; /* Update Clock Source */ |
emilmont | 10:3bc89ef62ce7 | 348 | while (!(LPC_SYSCON->SYSPLLCLKUEN & 0x01)); /* Wait Until Updated */ |
emilmont | 10:3bc89ef62ce7 | 349 | #if ((MAINCLKSEL_Val & 0x03) == 3) /* Main Clock is PLL Out */ |
emilmont | 10:3bc89ef62ce7 | 350 | LPC_SYSCON->SYSPLLCTRL = SYSPLLCTRL_Val; |
emilmont | 10:3bc89ef62ce7 | 351 | LPC_SYSCON->PDRUNCFG &= ~(0x1 << 7); /* Power-up SYSPLL */ |
emilmont | 10:3bc89ef62ce7 | 352 | while (!(LPC_SYSCON->SYSPLLSTAT & 0x01)); /* Wait Until PLL Locked */ |
emilmont | 10:3bc89ef62ce7 | 353 | #endif |
emilmont | 10:3bc89ef62ce7 | 354 | |
emilmont | 10:3bc89ef62ce7 | 355 | #if (((MAINCLKSEL_Val & 0x03) == 2) ) |
emilmont | 10:3bc89ef62ce7 | 356 | LPC_SYSCON->WDTOSCCTRL = WDTOSCCTRL_Val; |
emilmont | 10:3bc89ef62ce7 | 357 | LPC_SYSCON->PDRUNCFG &= ~(0x1 << 6); /* Power-up WDT Clock */ |
emilmont | 10:3bc89ef62ce7 | 358 | for (i = 0; i < 200; i++) __NOP(); |
emilmont | 10:3bc89ef62ce7 | 359 | #endif |
emilmont | 10:3bc89ef62ce7 | 360 | |
emilmont | 10:3bc89ef62ce7 | 361 | LPC_SYSCON->MAINCLKSEL = MAINCLKSEL_Val; /* Select PLL Clock Output */ |
emilmont | 10:3bc89ef62ce7 | 362 | LPC_SYSCON->MAINCLKUEN = 0x01; /* Update MCLK Clock Source */ |
emilmont | 10:3bc89ef62ce7 | 363 | while (!(LPC_SYSCON->MAINCLKUEN & 0x01)); /* Wait Until Updated */ |
emilmont | 10:3bc89ef62ce7 | 364 | |
emilmont | 10:3bc89ef62ce7 | 365 | LPC_SYSCON->SYSAHBCLKDIV = SYSAHBCLKDIV_Val; |
emilmont | 10:3bc89ef62ce7 | 366 | #endif |
emilmont | 10:3bc89ef62ce7 | 367 | } |