tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_NXP/TARGET_LPC176X/system_LPC17xx.c

   1 /**************************************************************************//**
   2  * @file     system_LPC17xx.c
   3  * @brief    CMSIS Cortex-M3 Device System Source File for
   4  *           NXP LPC17xx Device Series
   5  * @version  V1.11
   6  * @date     21. June 2011
   7  *
   8  * @note
   9  * Copyright (C) 2009-2011 ARM Limited. All rights reserved.
  10  *
  11  * @par
  12  * ARM Limited (ARM) is supplying this software for use with Cortex-M
  13  * processor based microcontrollers.  This file can be freely distributed
  14  * within development tools that are supporting such ARM based processors.
  15  *
  16  * @par
  17  * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
  18  * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
  20  * ARM SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR
  21  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
  22  *
  23  ******************************************************************************/
  24
  25
  26 #include <stdint.h>
  27 #include "LPC17xx.h"
  28
  29
  30 /** @addtogroup LPC17xx_System
  31  * @{
  32  */
  33
  34 /*
  35 //-------- <<< Use Configuration Wizard in Context Menu >>> ------------------
  36 */
  37
  38 /*--------------------- Clock Configuration ----------------------------------
  39 //
  40 // <e> Clock Configuration
  41 //   <h> System Controls and Status Register (SCS)
  42 //     <o1.4>    OSCRANGE: Main Oscillator Range Select
  43 //                     <0=>  1 MHz to 20 MHz
  44 //                     <1=> 15 MHz to 25 MHz
  45 //     <e1.5>       OSCEN: Main Oscillator Enable
  46 //     </e>
  47 //   </h>
  48 //
  49 //   <h> Clock Source Select Register (CLKSRCSEL)
  50 //     <o2.0..1>   CLKSRC: PLL Clock Source Selection
  51 //                     <0=> Internal RC oscillator
  52 //                     <1=> Main oscillator
  53 //                     <2=> RTC oscillator
  54 //   </h>
  55 //
  56 //   <e3> PLL0 Configuration (Main PLL)
  57 //     <h> PLL0 Configuration Register (PLL0CFG)
  58 //                     <i> F_cco0 = (2 * M * F_in) / N
  59 //                     <i> F_in must be in the range of 32 kHz to 50 MHz
  60 //                     <i> F_cco0 must be in the range of 275 MHz to 550 MHz
  61 //       <o4.0..14>  MSEL: PLL Multiplier Selection
  62 //                     <6-32768><#-1>
  63 //                     <i> M Value
  64 //       <o4.16..23> NSEL: PLL Divider Selection
  65 //                     <1-256><#-1>
  66 //                     <i> N Value
  67 //     </h>
  68 //   </e>
  69 //
  70 //   <e5> PLL1 Configuration (USB PLL)
  71 //     <h> PLL1 Configuration Register (PLL1CFG)
  72 //                     <i> F_usb = M * F_osc or F_usb = F_cco1 / (2 * P)
  73 //                     <i> F_cco1 = F_osc * M * 2 * P
  74 //                     <i> F_cco1 must be in the range of 156 MHz to 320 MHz
  75 //       <o6.0..4>   MSEL: PLL Multiplier Selection
  76 //                     <1-32><#-1>
  77 //                     <i> M Value (for USB maximum value is 4)
  78 //       <o6.5..6>   PSEL: PLL Divider Selection
  79 //                     <0=> 1
  80 //                     <1=> 2
  81 //                     <2=> 4
  82 //                     <3=> 8
  83 //                     <i> P Value
  84 //     </h>
  85 //   </e>
  86 //
  87 //   <h> CPU Clock Configuration Register (CCLKCFG)
  88 //     <o7.0..7>  CCLKSEL: Divide Value for CPU Clock from PLL0
  89 //                     <1-256><#-1>
  90 //   </h>
  91 //
  92 //   <h> USB Clock Configuration Register (USBCLKCFG)
  93 //     <o8.0..3>   USBSEL: Divide Value for USB Clock from PLL0
  94 //                     <0-15>
  95 //                     <i> Divide is USBSEL + 1
  96 //   </h>
  97 //
  98 //   <h> Peripheral Clock Selection Register 0 (PCLKSEL0)
  99 //     <o9.0..1>    PCLK_WDT: Peripheral Clock Selection for WDT
 100 //                     <0=> Pclk = Cclk / 4
 101 //                     <1=> Pclk = Cclk
 102 //                     <2=> Pclk = Cclk / 2
 103 //                     <3=> Pclk = Hclk / 8
 104 //     <o9.2..3>    PCLK_TIMER0: Peripheral Clock Selection for TIMER0
 105 //                     <0=> Pclk = Cclk / 4
 106 //                     <1=> Pclk = Cclk
 107 //                     <2=> Pclk = Cclk / 2
 108 //                     <3=> Pclk = Hclk / 8
 109 //     <o9.4..5>    PCLK_TIMER1: Peripheral Clock Selection for TIMER1
 110 //                     <0=> Pclk = Cclk / 4
 111 //                     <1=> Pclk = Cclk
 112 //                     <2=> Pclk = Cclk / 2
 113 //                     <3=> Pclk = Hclk / 8
 114 //     <o9.6..7>    PCLK_UART0: Peripheral Clock Selection for UART0
 115 //                     <0=> Pclk = Cclk / 4
 116 //                     <1=> Pclk = Cclk
 117 //                     <2=> Pclk = Cclk / 2
 118 //                     <3=> Pclk = Hclk / 8
 119 //     <o9.8..9>    PCLK_UART1: Peripheral Clock Selection for UART1
 120 //                     <0=> Pclk = Cclk / 4
 121 //                     <1=> Pclk = Cclk
 122 //                     <2=> Pclk = Cclk / 2
 123 //                     <3=> Pclk = Hclk / 8
 124 //     <o9.12..13>  PCLK_PWM1: Peripheral Clock Selection for PWM1
 125 //                     <0=> Pclk = Cclk / 4
 126 //                     <1=> Pclk = Cclk
 127 //                     <2=> Pclk = Cclk / 2
 128 //                     <3=> Pclk = Hclk / 8
 129 //     <o9.14..15>  PCLK_I2C0: Peripheral Clock Selection for I2C0
 130 //                     <0=> Pclk = Cclk / 4
 131 //                     <1=> Pclk = Cclk
 132 //                     <2=> Pclk = Cclk / 2
 133 //                     <3=> Pclk = Hclk / 8
 134 //     <o9.16..17>  PCLK_SPI: Peripheral Clock Selection for SPI
 135 //                     <0=> Pclk = Cclk / 4
 136 //                     <1=> Pclk = Cclk
 137 //                     <2=> Pclk = Cclk / 2
 138 //                     <3=> Pclk = Hclk / 8
 139 //     <o9.20..21>  PCLK_SSP1: Peripheral Clock Selection for SSP1
 140 //                     <0=> Pclk = Cclk / 4
 141 //                     <1=> Pclk = Cclk
 142 //                     <2=> Pclk = Cclk / 2
 143 //                     <3=> Pclk = Hclk / 8
 144 //     <o9.22..23>  PCLK_DAC: Peripheral Clock Selection for DAC
 145 //                     <0=> Pclk = Cclk / 4
 146 //                     <1=> Pclk = Cclk
 147 //                     <2=> Pclk = Cclk / 2
 148 //                     <3=> Pclk = Hclk / 8
 149 //     <o9.24..25>  PCLK_ADC: Peripheral Clock Selection for ADC
 150 //                     <0=> Pclk = Cclk / 4
 151 //                     <1=> Pclk = Cclk
 152 //                     <2=> Pclk = Cclk / 2
 153 //                     <3=> Pclk = Hclk / 8
 154 //     <o9.26..27>  PCLK_CAN1: Peripheral Clock Selection for CAN1
 155 //                     <0=> Pclk = Cclk / 4
 156 //                     <1=> Pclk = Cclk
 157 //                     <2=> Pclk = Cclk / 2
 158 //                     <3=> Pclk = Hclk / 6
 159 //     <o9.28..29>  PCLK_CAN2: Peripheral Clock Selection for CAN2
 160 //                     <0=> Pclk = Cclk / 4
 161 //                     <1=> Pclk = Cclk
 162 //                     <2=> Pclk = Cclk / 2
 163 //                     <3=> Pclk = Hclk / 6
 164 //     <o9.30..31>  PCLK_ACF: Peripheral Clock Selection for ACF
 165 //                     <0=> Pclk = Cclk / 4
 166 //                     <1=> Pclk = Cclk
 167 //                     <2=> Pclk = Cclk / 2
 168 //                     <3=> Pclk = Hclk / 6
 169 //   </h>
 170 //
 171 //   <h> Peripheral Clock Selection Register 1 (PCLKSEL1)
 172 //     <o10.0..1>   PCLK_QEI: Peripheral Clock Selection for the Quadrature Encoder Interface
 173 //                     <0=> Pclk = Cclk / 4
 174 //                     <1=> Pclk = Cclk
 175 //                     <2=> Pclk = Cclk / 2
 176 //                     <3=> Pclk = Hclk / 8
 177 //     <o10.2..3>   PCLK_GPIO: Peripheral Clock Selection for GPIOs
 178 //                     <0=> Pclk = Cclk / 4
 179 //                     <1=> Pclk = Cclk
 180 //                     <2=> Pclk = Cclk / 2
 181 //                     <3=> Pclk = Hclk / 8
 182 //     <o10.4..5>   PCLK_PCB: Peripheral Clock Selection for the Pin Connect Block
 183 //                     <0=> Pclk = Cclk / 4
 184 //                     <1=> Pclk = Cclk
 185 //                     <2=> Pclk = Cclk / 2
 186 //                     <3=> Pclk = Hclk / 8
 187 //     <o10.6..7>   PCLK_I2C1: Peripheral Clock Selection for I2C1
 188 //                     <0=> Pclk = Cclk / 4
 189 //                     <1=> Pclk = Cclk
 190 //                     <2=> Pclk = Cclk / 2
 191 //                     <3=> Pclk = Hclk / 8
 192 //     <o10.10..11> PCLK_SSP0: Peripheral Clock Selection for SSP0
 193 //                     <0=> Pclk = Cclk / 4
 194 //                     <1=> Pclk = Cclk
 195 //                     <2=> Pclk = Cclk / 2
 196 //                     <3=> Pclk = Hclk / 8
 197 //     <o10.12..13> PCLK_TIMER2: Peripheral Clock Selection for TIMER2
 198 //                     <0=> Pclk = Cclk / 4
 199 //                     <1=> Pclk = Cclk
 200 //                     <2=> Pclk = Cclk / 2
 201 //                     <3=> Pclk = Hclk / 8
 202 //     <o10.14..15> PCLK_TIMER3: Peripheral Clock Selection for TIMER3
 203 //                     <0=> Pclk = Cclk / 4
 204 //                     <1=> Pclk = Cclk
 205 //                     <2=> Pclk = Cclk / 2
 206 //                     <3=> Pclk = Hclk / 8
 207 //     <o10.16..17> PCLK_UART2: Peripheral Clock Selection for UART2
 208 //                     <0=> Pclk = Cclk / 4
 209 //                     <1=> Pclk = Cclk
 210 //                     <2=> Pclk = Cclk / 2
 211 //                     <3=> Pclk = Hclk / 8
 212 //     <o10.18..19> PCLK_UART3: Peripheral Clock Selection for UART3
 213 //                     <0=> Pclk = Cclk / 4
 214 //                     <1=> Pclk = Cclk
 215 //                     <2=> Pclk = Cclk / 2
 216 //                     <3=> Pclk = Hclk / 8
 217 //     <o10.20..21> PCLK_I2C2: Peripheral Clock Selection for I2C2
 218 //                     <0=> Pclk = Cclk / 4
 219 //                     <1=> Pclk = Cclk
 220 //                     <2=> Pclk = Cclk / 2
 221 //                     <3=> Pclk = Hclk / 8
 222 //     <o10.22..23> PCLK_I2S: Peripheral Clock Selection for I2S
 223 //                     <0=> Pclk = Cclk / 4
 224 //                     <1=> Pclk = Cclk
 225 //                     <2=> Pclk = Cclk / 2
 226 //                     <3=> Pclk = Hclk / 8
 227 //     <o10.26..27> PCLK_RIT: Peripheral Clock Selection for the Repetitive Interrupt Timer
 228 //                     <0=> Pclk = Cclk / 4
 229 //                     <1=> Pclk = Cclk
 230 //                     <2=> Pclk = Cclk / 2
 231 //                     <3=> Pclk = Hclk / 8
 232 //     <o10.28..29> PCLK_SYSCON: Peripheral Clock Selection for the System Control Block
 233 //                     <0=> Pclk = Cclk / 4
 234 //                     <1=> Pclk = Cclk
 235 //                     <2=> Pclk = Cclk / 2
 236 //                     <3=> Pclk = Hclk / 8
 237 //     <o10.30..31> PCLK_MC: Peripheral Clock Selection for the Motor Control PWM
 238 //                     <0=> Pclk = Cclk / 4
 239 //                     <1=> Pclk = Cclk
 240 //                     <2=> Pclk = Cclk / 2
 241 //                     <3=> Pclk = Hclk / 8
 242 //   </h>
 243 //
 244 //   <h> Power Control for Peripherals Register (PCONP)
 245 //     <o11.1>      PCTIM0: Timer/Counter 0 power/clock enable
 246 //     <o11.2>      PCTIM1: Timer/Counter 1 power/clock enable
 247 //     <o11.3>      PCUART0: UART 0 power/clock enable
 248 //     <o11.4>      PCUART1: UART 1 power/clock enable
 249 //     <o11.6>      PCPWM1: PWM 1 power/clock enable
 250 //     <o11.7>      PCI2C0: I2C interface 0 power/clock enable
 251 //     <o11.8>      PCSPI: SPI interface power/clock enable
 252 //     <o11.9>      PCRTC: RTC power/clock enable
 253 //     <o11.10>     PCSSP1: SSP interface 1 power/clock enable
 254 //     <o11.12>     PCAD: A/D converter power/clock enable
 255 //     <o11.13>     PCCAN1: CAN controller 1 power/clock enable
 256 //     <o11.14>     PCCAN2: CAN controller 2 power/clock enable
 257 //     <o11.15>     PCGPIO: GPIOs power/clock enable
 258 //     <o11.16>     PCRIT: Repetitive interrupt timer power/clock enable
 259 //     <o11.17>     PCMC: Motor control PWM power/clock enable
 260 //     <o11.18>     PCQEI: Quadrature encoder interface power/clock enable
 261 //     <o11.19>     PCI2C1: I2C interface 1 power/clock enable
 262 //     <o11.21>     PCSSP0: SSP interface 0 power/clock enable
 263 //     <o11.22>     PCTIM2: Timer 2 power/clock enable
 264 //     <o11.23>     PCTIM3: Timer 3 power/clock enable
 265 //     <o11.24>     PCUART2: UART 2 power/clock enable
 266 //     <o11.25>     PCUART3: UART 3 power/clock enable
 267 //     <o11.26>     PCI2C2: I2C interface 2 power/clock enable
 268 //     <o11.27>     PCI2S: I2S interface power/clock enable
 269 //     <o11.29>     PCGPDMA: GP DMA function power/clock enable
 270 //     <o11.30>     PCENET: Ethernet block power/clock enable
 271 //     <o11.31>     PCUSB: USB interface power/clock enable
 272 //   </h>
 273 //
 274 //   <h> Clock Output Configuration Register (CLKOUTCFG)
 275 //     <o12.0..3>   CLKOUTSEL: Selects clock source for CLKOUT
 276 //                     <0=> CPU clock
 277 //                     <1=> Main oscillator
 278 //                     <2=> Internal RC oscillator
 279 //                     <3=> USB clock
 280 //                     <4=> RTC oscillator
 281 //     <o12.4..7>   CLKOUTDIV: Selects clock divider for CLKOUT
 282 //                     <1-16><#-1>
 283 //     <o12.8>      CLKOUT_EN: CLKOUT enable control
 284 //   </h>
 285 //
 286 // </e>
 287 */
 288
 289
 290
 291 /** @addtogroup LPC17xx_System_Defines  LPC17xx System Defines
 292   @{
 293  */
 294
 295 #define CLOCK_SETUP           1
 296 #define SCS_Val               0x00000020
 297 #define CLKSRCSEL_Val         0x00000001
 298 #define PLL0_SETUP            1
 299
 300 #ifdef MCB1700
 301 #    define PLL0CFG_Val           0x00050063
 302 #    define PLL1_SETUP            1
 303 #    define PLL1CFG_Val           0x00000023
 304 #    define CCLKCFG_Val           0x00000003
 305 #    define USBCLKCFG_Val         0x00000000
 306 #else
 307 #    define PLL0CFG_Val           0x0000000B
 308 #    define PLL1_SETUP            0
 309 #    define PLL1CFG_Val           0x00000000
 310 #    define CCLKCFG_Val           0x00000002
 311 #    define USBCLKCFG_Val         0x00000005
 312 #endif
 313
 314 #define PCLKSEL0_Val          0x00000000
 315 #define PCLKSEL1_Val          0x00000000
 316 #define PCONP_Val             0x042887DE
 317 #define CLKOUTCFG_Val         0x00000000
 318
 319
 320 /*--------------------- Flash Accelerator Configuration ----------------------
 321 //
 322 // <e> Flash Accelerator Configuration
 323 //   <o1.12..15> FLASHTIM: Flash Access Time
 324 //               <0=> 1 CPU clock (for CPU clock up to 20 MHz)
 325 //               <1=> 2 CPU clocks (for CPU clock up to 40 MHz)
 326 //               <2=> 3 CPU clocks (for CPU clock up to 60 MHz)
 327 //               <3=> 4 CPU clocks (for CPU clock up to 80 MHz)
 328 //               <4=> 5 CPU clocks (for CPU clock up to 100 MHz)
 329 //               <5=> 6 CPU clocks (for any CPU clock)
 330 // </e>
 331 */
 332 #define FLASH_SETUP           1
 333 #define FLASHCFG_Val          0x0000303A
 334
 335 /*
 336 //-------- <<< end of configuration section >>> ------------------------------
 337 */
 338
 339 /*----------------------------------------------------------------------------
 340   Check the register settings
 341  *----------------------------------------------------------------------------*/
 342 #define CHECK_RANGE(val, min, max)                ((val < min) || (val > max))
 343 #define CHECK_RSVD(val, mask)                     (val & mask)
 344
 345 /* Clock Configuration -------------------------------------------------------*/
 346 #if (CHECK_RSVD((SCS_Val),       ~0x00000030))
 347    #error "SCS: Invalid values of reserved bits!"
 348 #endif
 349
 350 #if (CHECK_RANGE((CLKSRCSEL_Val), 0, 2))
 351    #error "CLKSRCSEL: Value out of range!"
 352 #endif
 353
 354 #if (CHECK_RSVD((PLL0CFG_Val),   ~0x00FF7FFF))
 355    #error "PLL0CFG: Invalid values of reserved bits!"
 356 #endif
 357
 358 #if (CHECK_RSVD((PLL1CFG_Val),   ~0x0000007F))
 359    #error "PLL1CFG: Invalid values of reserved bits!"
 360 #endif
 361
 362 #if (PLL0_SETUP)            /* if PLL0 is used */
 363   #if (CCLKCFG_Val < 2)     /* CCLKSEL must be greater then 1 */
 364     #error "CCLKCFG: CCLKSEL must be greater then 1 if PLL0 is used!"
 365   #endif
 366 #endif
 367
 368 #if (CHECK_RANGE((CCLKCFG_Val), 2, 255))
 369    #error "CCLKCFG: Value out of range!"
 370 #endif
 371
 372 #if (CHECK_RSVD((USBCLKCFG_Val), ~0x0000000F))
 373    #error "USBCLKCFG: Invalid values of reserved bits!"
 374 #endif
 375
 376 #if (CHECK_RSVD((PCLKSEL0_Val),   0x000C0C00))
 377    #error "PCLKSEL0: Invalid values of reserved bits!"
 378 #endif
 379
 380 #if (CHECK_RSVD((PCLKSEL1_Val),   0x03000300))
 381    #error "PCLKSEL1: Invalid values of reserved bits!"
 382 #endif
 383
 384 #if (CHECK_RSVD((PCONP_Val),      0x10100821))
 385    #error "PCONP: Invalid values of reserved bits!"
 386 #endif
 387
 388 #if (CHECK_RSVD((CLKOUTCFG_Val), ~0x000001FF))
 389    #error "CLKOUTCFG: Invalid values of reserved bits!"
 390 #endif
 391
 392 /* Flash Accelerator Configuration -------------------------------------------*/
 393 #if (CHECK_RSVD((FLASHCFG_Val), ~0x0000F07F))
 394    #error "FLASHCFG: Invalid values of reserved bits!"
 395 #endif
 396
 397
 398 /*----------------------------------------------------------------------------
 399   DEFINES
 400  *----------------------------------------------------------------------------*/
 401
 402 /*----------------------------------------------------------------------------
 403   Define clocks
 404  *----------------------------------------------------------------------------*/
 405 #define XTAL        (12000000UL)        /* Oscillator frequency               */
 406 #define OSC_CLK     (      XTAL)        /* Main oscillator frequency          */
 407 #define RTC_CLK     (   32000UL)        /* RTC oscillator frequency           */
 408 #define IRC_OSC     ( 4000000UL)        /* Internal RC oscillator frequency   */
 409
 410
 411 /* F_cco0 = (2 * M * F_in) / N  */
 412 #define __M               (((PLL0CFG_Val      ) & 0x7FFF) + 1)
 413 #define __N               (((PLL0CFG_Val >> 16) & 0x00FF) + 1)
 414 #define __FCCO(__F_IN)    ((2ULL * __M * __F_IN) / __N)
 415 #define __CCLK_DIV        (((CCLKCFG_Val      ) & 0x00FF) + 1)
 416
 417 /* Determine core clock frequency according to settings */
 418  #if (PLL0_SETUP)
 419     #if   ((CLKSRCSEL_Val & 0x03) == 1)
 420         #define __CORE_CLK (__FCCO(OSC_CLK) / __CCLK_DIV)
 421     #elif ((CLKSRCSEL_Val & 0x03) == 2)
 422         #define __CORE_CLK (__FCCO(RTC_CLK) / __CCLK_DIV)
 423     #else
 424         #define __CORE_CLK (__FCCO(IRC_OSC) / __CCLK_DIV)
 425     #endif
 426  #else
 427     #if   ((CLKSRCSEL_Val & 0x03) == 1)
 428         #define __CORE_CLK (OSC_CLK         / __CCLK_DIV)
 429     #elif ((CLKSRCSEL_Val & 0x03) == 2)
 430         #define __CORE_CLK (RTC_CLK         / __CCLK_DIV)
 431     #else
 432         #define __CORE_CLK (IRC_OSC         / __CCLK_DIV)
 433     #endif
 434  #endif
 435
 436 /**
 437  * @}
 438  */
 439
 440
 441 /** @addtogroup LPC17xx_System_Public_Variables  LPC17xx System Public Variables
 442   @{
 443  */
 444 /*----------------------------------------------------------------------------
 445   Clock Variable definitions
 446  *----------------------------------------------------------------------------*/
 447 uint32_t SystemCoreClock = __CORE_CLK;/*!< System Clock Frequency (Core Clock)*/
 448
 449 /**
 450  * @}
 451  */
 452
 453
 454 /** @addtogroup LPC17xx_System_Public_Functions  LPC17xx System Public Functions
 455   @{
 456  */
 457
 458 /**
 459  * Update SystemCoreClock variable
 460  *
 461  * @param  none
 462  * @return none
 463  *
 464  * @brief  Updates the SystemCoreClock with current core Clock
 465  *         retrieved from cpu registers.
 466  */void SystemCoreClockUpdate (void)            /* Get Core Clock Frequency      */
 467 {
 468   /* Determine clock frequency according to clock register values             */
 469   if (((LPC_SC->PLL0STAT >> 24) & 3) == 3) { /* If PLL0 enabled and connected */
 470     switch (LPC_SC->CLKSRCSEL & 0x03) {
 471       case 0:                                /* Int. RC oscillator => PLL0    */
 472       case 3:                                /* Reserved, default to Int. RC  */
 473         SystemCoreClock = (IRC_OSC *
 474                           ((2ULL * ((LPC_SC->PLL0STAT & 0x7FFF) + 1)))  /
 475                           (((LPC_SC->PLL0STAT >> 16) & 0xFF) + 1)       /
 476                           ((LPC_SC->CCLKCFG & 0xFF)+ 1));
 477         break;
 478       case 1:                                /* Main oscillator => PLL0       */
 479         SystemCoreClock = (OSC_CLK *
 480                           ((2ULL * ((LPC_SC->PLL0STAT & 0x7FFF) + 1)))  /
 481                           (((LPC_SC->PLL0STAT >> 16) & 0xFF) + 1)       /
 482                           ((LPC_SC->CCLKCFG & 0xFF)+ 1));
 483         break;
 484       case 2:                                /* RTC oscillator => PLL0        */
 485         SystemCoreClock = (RTC_CLK *
 486                           ((2ULL * ((LPC_SC->PLL0STAT & 0x7FFF) + 1)))  /
 487                           (((LPC_SC->PLL0STAT >> 16) & 0xFF) + 1)       /
 488                           ((LPC_SC->CCLKCFG & 0xFF)+ 1));
 489         break;
 490     }
 491   } else {
 492     switch (LPC_SC->CLKSRCSEL & 0x03) {
 493       case 0:                                /* Int. RC oscillator => PLL0    */
 494       case 3:                                /* Reserved, default to Int. RC  */
 495         SystemCoreClock = IRC_OSC / ((LPC_SC->CCLKCFG & 0xFF)+ 1);
 496         break;
 497       case 1:                                /* Main oscillator => PLL0       */
 498         SystemCoreClock = OSC_CLK / ((LPC_SC->CCLKCFG & 0xFF)+ 1);
 499         break;
 500       case 2:                                /* RTC oscillator => PLL0        */
 501         SystemCoreClock = RTC_CLK / ((LPC_SC->CCLKCFG & 0xFF)+ 1);
 502         break;
 503     }
 504   }
 505
 506 }
 507
 508 /**
 509  * Initialize the system
 510  *
 511  * @param  none
 512  * @return none
 513  *
 514  * @brief  Setup the microcontroller system.
 515  *         Initialize the System.
 516  */
 517 void SystemInit (void)
 518 {
 519 #if (CLOCK_SETUP)                       /* Clock Setup                        */
 520   LPC_SC->SCS       = SCS_Val;
 521   if (LPC_SC->SCS & (1 << 5)) {             /* If Main Oscillator is enabled  */
 522     while ((LPC_SC->SCS & (1<<6)) == 0);/* Wait for Oscillator to be ready    */
 523   }
 524
 525   LPC_SC->CCLKCFG   = CCLKCFG_Val;      /* Setup Clock Divider                */
 526   /* Periphral clock must be selected before PLL0 enabling and connecting
 527    * - according errata.lpc1768-16.March.2010 -
 528    */
 529   LPC_SC->PCLKSEL0  = PCLKSEL0_Val;     /* Peripheral Clock Selection         */
 530   LPC_SC->PCLKSEL1  = PCLKSEL1_Val;
 531
 532 #if (PLL0_SETUP)
 533   LPC_SC->CLKSRCSEL = CLKSRCSEL_Val;    /* Select Clock Source for PLL0       */
 534
 535   LPC_SC->PLL0CFG   = PLL0CFG_Val;      /* configure PLL0                     */
 536   LPC_SC->PLL0FEED  = 0xAA;
 537   LPC_SC->PLL0FEED  = 0x55;
 538
 539   LPC_SC->PLL0CON   = 0x01;             /* PLL0 Enable                        */
 540   LPC_SC->PLL0FEED  = 0xAA;
 541   LPC_SC->PLL0FEED  = 0x55;
 542   while (!(LPC_SC->PLL0STAT & (1<<26)));/* Wait for PLOCK0                    */
 543
 544   LPC_SC->PLL0CON   = 0x03;             /* PLL0 Enable & Connect              */
 545   LPC_SC->PLL0FEED  = 0xAA;
 546   LPC_SC->PLL0FEED  = 0x55;
 547   while (!(LPC_SC->PLL0STAT & ((1<<25) | (1<<24))));/* Wait for PLLC0_STAT & PLLE0_STAT */
 548 #endif
 549
 550 #if (PLL1_SETUP)
 551   LPC_SC->PLL1CFG   = PLL1CFG_Val;
 552   LPC_SC->PLL1FEED  = 0xAA;
 553   LPC_SC->PLL1FEED  = 0x55;
 554
 555   LPC_SC->PLL1CON   = 0x01;             /* PLL1 Enable                        */
 556   LPC_SC->PLL1FEED  = 0xAA;
 557   LPC_SC->PLL1FEED  = 0x55;
 558   while (!(LPC_SC->PLL1STAT & (1<<10)));/* Wait for PLOCK1                    */
 559
 560   LPC_SC->PLL1CON   = 0x03;             /* PLL1 Enable & Connect              */
 561   LPC_SC->PLL1FEED  = 0xAA;
 562   LPC_SC->PLL1FEED  = 0x55;
 563   while (!(LPC_SC->PLL1STAT & ((1<< 9) | (1<< 8))));/* Wait for PLLC1_STAT & PLLE1_STAT */
 564 #else
 565   LPC_SC->USBCLKCFG = USBCLKCFG_Val;    /* Setup USB Clock Divider            */
 566 #endif
 567
 568   LPC_SC->PCONP     = PCONP_Val;        /* Power Control for Peripherals      */
 569
 570   LPC_SC->CLKOUTCFG = CLKOUTCFG_Val;    /* Clock Output Configuration         */
 571 #endif
 572
 573 #if (FLASH_SETUP == 1)                  /* Flash Accelerator Setup            */
 574   LPC_SC->FLASHCFG  = (LPC_SC->FLASHCFG & ~0x0000F000) | FLASHCFG_Val;
 575 #endif
 576 }
 577
 578 /**
 579  * @}
 580  */
 581
 582 /**
 583  * @}
 584  */