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   1 /******************************************************************************\r
   2  * @file     system_XMC4500.c\r
   3  * @brief    Device specific initialization for the XMC4500-Series according to CMSIS\r
   4  * @version  V2.2\r
   5  * @date     20. January 2012\r
   6  *\r
   7  * @note\r
   8  * Copyright (C) 2011 Infineon Technologies AG. All rights reserved.\r
   9 \r
  10  *\r
  11  * @par\r
  12  * Infineon Technologies AG (Infineon) is supplying this software for use with Infineon\92s microcontrollers.  \r
  13  * This file can be freely distributed within development tools that are supporting such microcontrollers. \r
  14 \r
  15  *\r
  16  * @par\r
  17  * THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED\r
  18  * OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF\r
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.\r
  20  * INFINEON SHALL NOT, IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL, OR\r
  21  * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.\r
  22  *\r
  23  *\r
  24  ******************************************************************************/\r
  25 \r
  26 #include "System_XMC4500.h"\r
  27 #include <XMC4500.h>\r
  28 \r
  29 /*----------------------------------------------------------------------------\r
  30   Define clocks is located in System_XMC4500.h\r
  31  *----------------------------------------------------------------------------*/\r
  32 \r
  33 /*----------------------------------------------------------------------------\r
  34   Clock Variable definitions\r
  35  *----------------------------------------------------------------------------*/\r
  36 /*!< System Clock Frequency (Core Clock)*/\r
  37 uint32_t SystemCoreClock = CLOCK_OSC_HP;\r
  38 \r
  39 /*\r
  40 //-------- <<< Use Configuration Wizard in Context Menu >>> ------------------\r
  41 */\r
  42 \r
  43 \r
  44 \r
  45 /*--------------------- Watchdog Configuration -------------------------------\r
  46 //\r
  47 // <e> Watchdog Configuration\r
  48 //     <o1.0> Disable Watchdog\r
  49 //\r
  50 // </e>\r
  51 */\r
  52 #define WDT_SETUP               1\r
  53 #define WDTENB_nVal             0x00000001\r
  54 \r
  55 /*--------------------- CLOCK Configuration -------------------------------\r
  56 //\r
  57 // <e> Main Clock Configuration\r
  58 //     <o1.0..1> CPU clock divider\r
  59 //                     <0=> fCPU = fSYS \r
  60 //                     <1=> fCPU = fSYS / 2\r
  61 //     <o2.0..1>  Peripheral Bus clock divider\r
  62 //                     <0=> fPB = fCPU\r
  63 //                     <1=> fPB = fCPU / 2\r
  64 //     <o3.0..1>  CCU Bus clock divider\r
  65 //                     <0=> fCCU = fCPU\r
  66 //                     <1=> fCCU = fCPU / 2\r
  67 //\r
  68 // </e>\r
  69 // \r
  70 */\r
  71 \r
  72 #define SCU_CLOCK_SETUP               1\r
  73 #define SCU_CPUCLKCR_DIV                0x00000000\r
  74 #define SCU_PBCLKCR_DIV             0x00000000\r
  75 #define SCU_CCUCLKCR_DIV                0x00000000\r
  76 \r
  77 \r
  78 \r
  79 /*--------------------- USB CLOCK Configuration ---------------------------\r
  80 //\r
  81 // <e> USB Clock Configuration\r
  82 //\r
  83 // </e>\r
  84 // \r
  85 */\r
  86 \r
  87 #define SCU_USB_CLOCK_SETUP              0\r
  88 \r
  89 \r
  90 /*--------------------- CLOCKOUT Configuration -------------------------------\r
  91 //\r
  92 // <e> Clock OUT Configuration\r
  93 //     <o1.0..1>   Clockout Source Selection\r
  94 //                     <0=> System Clock\r
  95 //                     <2=> USB Clock\r
  96 //                     <3=> Divided value of PLL Clock\r
  97 //     <o2.0..1>   Clockout Pin Selection\r
  98 //                     <0=> P1.15\r
  99 //                     <1=> P0.8\r
 100 //                     \r
 101 //\r
 102 // </e>\r
 103 // \r
 104 */\r
 105 \r
 106 #define SCU_CLOCKOUT_SETUP              0  // recommended to keep disabled\r
 107 #define SCU_CLOCKOUT_SOURCE             0x00000000\r
 108 #define SCU_CLOCKOUT_PIN                0x00000000\r
 109 \r
 110 /*----------------------------------------------------------------------------\r
 111   static functions declarations\r
 112  *----------------------------------------------------------------------------*/\r
 113 #if (SCU_CLOCK_SETUP == 1)\r
 114 static int SystemClockSetup(void);\r
 115 #endif\r
 116 \r
 117 #if (SCU_USB_CLOCK_SETUP == 1)\r
 118 static void USBClockSetup(void);\r
 119 #endif\r
 120 \r
 121 /**\r
 122   * @brief  Setup the microcontroller system.\r
 123   *         Initialize the PLL and update the \r
 124   *         SystemCoreClock variable.\r
 125   * @param  None\r
 126   * @retval None\r
 127   */\r
 128 void SystemInit(void)\r
 129 {\r
 130 /* Setup the WDT */\r
 131 #if (WDT_SETUP == 1)\r
 132 WDT->CTR &= ~WDTENB_nVal; \r
 133 #endif\r
 134 \r
 135 #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)\r
 136 SCB->CPACR |= ((3UL << 10*2) |                 /* set CP10 Full Access */\r
 137                (3UL << 11*2)  );               /* set CP11 Full Access */\r
 138 #endif\r
 139 \r
 140 /* Disable branch prediction - PCON.PBS = 1 */\r
 141 PREF->PCON |= (PREF_PCON_PBS_Msk);\r
 142 \r
 143 /* Enable unaligned memory access - SCB_CCR.UNALIGN_TRP = 0 */\r
 144 SCB->CCR &= ~(SCB_CCR_UNALIGN_TRP_Msk);\r
 145 \r
 146 /* Setup the clockout */\r
 147 /* README README README README README README README README README README */\r
 148 /*\r
 149  * Please use the CLOCKOUT feature with diligence. Use this only if you know\r
 150  * what you are doing.\r
 151  *\r
 152  * You must be aware that the settings below can potentially be in conflict\r
 153  * with DAVE code generation engine preferences.\r
 154  *\r
 155  * Even worse, the setting below configures the ports as output ports while in\r
 156  * reality, the board on which this chip is mounted may have a source driving\r
 157  * the ports.\r
 158  *\r
 159  * So use this feature only when you are absolutely sure that the port must \r
 160  * indeed be configured as an output AND you are NOT linking this startup code\r
 161  * with code that was generated by DAVE code engine.\r
 162  */\r
 163 #if (SCU_CLOCKOUT_SETUP == 1)\r
 164 SCU_CLK->EXTCLKCR       |= SCU_CLOCKOUT_SOURCE;\r
 165 \r
 166 if (SCU_CLOCKOUT_PIN) {\r
 167               PORT0->IOCR8 = 0x00000088;  /*P0.8 --> ALT1 select +  HWSEL */\r
 168               PORT0->HWSEL &= (~PORT0_HWSEL_HW8_Msk);\r
 169               }\r
 170 else PORT1->IOCR12 = 0x88000000; /*P1.15--> ALT1 select */\r
 171 #endif\r
 172 \r
 173 /* Setup the System clock */ \r
 174 #if (SCU_CLOCK_SETUP == 1)\r
 175 SystemClockSetup();\r
 176 #endif\r
 177 \r
 178 /* Setup the USB PL */ \r
 179 #if (SCU_USB_CLOCK_SETUP == 1)\r
 180 USBClockSetup();\r
 181 #endif\r
 182 \r
 183 }\r
 184 \r
 185 \r
 186 /**\r
 187   * @brief  Update SystemCoreClock according to Clock Register Values\r
 188   * @note   -  \r
 189   * @param  None\r
 190   * @retval None\r
 191   */\r
 192 void SystemCoreClockUpdate(void)\r
 193 {\r
 194 \r
 195 /*----------------------------------------------------------------------------\r
 196   Clock Variable definitions\r
 197  *----------------------------------------------------------------------------*/\r
 198 SystemCoreClock = SYSTEM_FREQUENCY;/*!< System Clock Frequency (Core Clock)*/\r
 199 \r
 200 }\r
 201 \r
 202 \r
 203 /**\r
 204   * @brief  -\r
 205   * @note   -  \r
 206   * @param  None\r
 207   * @retval None\r
 208   */\r
 209 #if (SCU_CLOCK_SETUP == 1)\r
 210 static int SystemClockSetup(void)\r
 211 {\r
 212 /* enable PLL first */\r
 213   SCU_PLL->PLLCON0 &= ~(SCU_PLL_PLLCON0_VCOPWD_Msk | \r
 214                                                                                                         SCU_PLL_PLLCON0_PLLPWD_Msk);\r
 215 \r
 216 /* Enable OSC_HP */\r
 217   if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)\r
 218   {\r
 219    /* Enable the OSC_HP*/\r
 220    SCU_OSC->OSCHPCTRL = (OSC_HP_MODE<<4);        \r
 221    /* Setup OSC WDG devider */\r
 222    SCU_OSC->OSCHPCTRL |= (OSCHPWDGDIV<<16);         \r
 223    /* Select external OSC as PLL input */\r
 224    SCU_PLL->PLLCON2 &= ~SCU_PLL_PLLCON2_PINSEL_Msk;\r
 225    /* Restart OSC Watchdog */\r
 226    SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_OSCRES_Msk;  \r
 227 \r
 228    do \r
 229    {\r
 230         ;  /* here a timeout need to be added */\r
 231    }while(!( (SCU_PLL->PLLSTAT) & \r
 232                                            (SCU_PLL_PLLSTAT_PLLHV_Msk | SCU_PLL_PLLSTAT_PLLLV_Msk |\r
 233                                             SCU_PLL_PLLSTAT_PLLSP_Msk)\r
 234                                          )\r
 235          ); \r
 236 \r
 237   }\r
 238 \r
 239 /* Setup Main PLL */\r
 240    /* Select FOFI as system clock */\r
 241    if(SCU_CLK->SYSCLKCR != 0X000000)\r
 242           SCU_CLK->SYSCLKCR = 0x00000000; /*Select FOFI*/\r
 243 \r
 244          /* Go to bypass the Main PLL */\r
 245    SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_VCOBYP_Msk;\r
 246 \r
 247          /* disconnect OSC_HP to PLL */\r
 248    SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_FINDIS_Msk;\r
 249 \r
 250          /* Setup devider settings for main PLL */\r
 251    SCU_PLL->PLLCON1 = ((PLL_K1DIV) | (PLL_NDIV<<8) | \r
 252                                      (PLL_K2DIV_STEP_1<<16) | (PLL_PDIV<<24));\r
 253 \r
 254          /* we may have to set OSCDISCDIS */\r
 255    SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_OSCDISCDIS_Msk;\r
 256 \r
 257          /* connect OSC_HP to PLL */\r
 258    SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_FINDIS_Msk;\r
 259 \r
 260          /* restart PLL Lock detection */\r
 261    SCU_PLL->PLLCON0 |= SCU_PLL_PLLCON0_RESLD_Msk;\r
 262 \r
 263          /* wait for PLL Lock */\r
 264    while (!(SCU_PLL->PLLSTAT & SCU_PLL_PLLSTAT_VCOLOCK_Msk));\r
 265 \r
 266         /* Go back to the Main PLL */\r
 267    SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_VCOBYP_Msk;\r
 268 \r
 269    /*********************************************************\r
 270    here we need to setup the system clock divider\r
 271    *********************************************************/\r
 272 \r
 273         SCU_CLK->CPUCLKCR = SCU_CPUCLKCR_DIV;\r
 274         SCU_CLK->PBCLKCR = SCU_PBCLKCR_DIV;     \r
 275         SCU_CLK->CCUCLKCR = SCU_CCUCLKCR_DIV;\r
 276 \r
 277    /* Switch system clock to PLL */\r
 278    SCU_CLK->SYSCLKCR |=  0x00010000; \r
 279                                                                                                                           \r
 280    /*********************************************************\r
 281    here the ramp up of the system clock starts\r
 282    *********************************************************/\r
 283     /* Delay for next K2 step ~50µs */\r
 284    /********************************/\r
 285    /* Set reload register */\r
 286    SysTick->LOAD  = ((1250+100) & SysTick_LOAD_RELOAD_Msk) - 1;\r
 287 \r
 288    /* Load the SysTick Counter Value */\r
 289    SysTick->VAL   = 0;                                         \r
 290 \r
 291    /* Enable SysTick IRQ and SysTick Timer */\r
 292    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |\r
 293                    SysTick_CTRL_ENABLE_Msk;                    \r
 294    \r
 295          /* wait for ~50µs  */\r
 296    while (SysTick->VAL >= 100);                                                            \r
 297 \r
 298    /* Stop SysTick Timer */\r
 299    SysTick->CTRL  &= ~SysTick_CTRL_ENABLE_Msk;                 \r
 300    /********************************/\r
 301 \r
 302    /* Setup devider settings for main PLL */\r
 303    SCU_PLL->PLLCON1 = ((PLL_K1DIV) | (PLL_NDIV<<8) | \r
 304                                      (PLL_K2DIV_STEP_2<<16) | (PLL_PDIV<<24));\r
 305 \r
 306    /* Delay for next K2 step ~50µs */\r
 307    /********************************/\r
 308    SysTick->LOAD  = ((3000+100) & SysTick_LOAD_RELOAD_Msk) - 1;\r
 309 \r
 310    /* Load the SysTick Counter Value */\r
 311    SysTick->VAL   = 0;\r
 312 \r
 313    /* Enable SysTick IRQ and SysTick Timer */\r
 314    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;\r
 315                                                                    \r
 316    /* Wait for ~50µs  */\r
 317    while (SysTick->VAL >= 100);                                                            \r
 318 \r
 319    /* Stop SysTick Timer */\r
 320    SysTick->CTRL  &= ~SysTick_CTRL_ENABLE_Msk;                 \r
 321    /********************************/\r
 322 \r
 323    /* Setup devider settings for main PLL */\r
 324    SCU_PLL->PLLCON1 = ((PLL_K1DIV) | (PLL_NDIV<<8) | \r
 325                                                                                             (PLL_K2DIV_STEP_3<<16) | (PLL_PDIV<<24));\r
 326 \r
 327    /* Delay for next K2 step ~50µs */\r
 328    /********************************/\r
 329    SysTick->LOAD  = ((4800+100) & SysTick_LOAD_RELOAD_Msk) - 1;\r
 330 \r
 331    /* Load the SysTick Counter Value */\r
 332    SysTick->VAL   = 0;                                         \r
 333 \r
 334    /* Enable SysTick IRQ and SysTick Timer */\r
 335    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk | SysTick_CTRL_ENABLE_Msk;\r
 336                                        \r
 337    /* Wait for ~50µs  */\r
 338    while (SysTick->VAL >= 100);                                                            \r
 339 \r
 340    /* Stop SysTick Timer */\r
 341    SysTick->CTRL  &= ~SysTick_CTRL_ENABLE_Msk;                 \r
 342    /********************************/\r
 343 \r
 344    /* Setup devider settings for main PLL */\r
 345    SCU_PLL->PLLCON1 = ((PLL_K1DIV) | (PLL_NDIV<<8) | (PLL_K2DIV<<16) | \r
 346                                                                (PLL_PDIV<<24));\r
 347 \r
 348          /* clear request for System OCS Watchdog Trap and System VCO Lock Trap  */\r
 349    SCU_TRAP->TRAPCLR = SCU_TRAP_TRAPCLR_SOSCWDGT_Msk | \r
 350                                                                             SCU_TRAP_TRAPCLR_SVCOLCKT_Msk;  \r
 351 \r
 352    return(1);\r
 353 \r
 354 }\r
 355 #endif\r
 356 \r
 357 /**\r
 358   * @brief  -\r
 359   * @note   -  \r
 360   * @param  None\r
 361   * @retval None\r
 362   */\r
 363 #if(SCU_USB_CLOCK_SETUP == 1)\r
 364 static void USBClockSetup(void)\r
 365 {\r
 366 /* enable PLL first */\r
 367   SCU_PLL->USBPLLCON &= ~(SCU_PLL_USBPLLCON_VCOPWD_Msk | \r
 368                                                                                                        SCU_PLL_USBPLLCON_PLLPWD_Msk);\r
 369 \r
 370 /* check and if not already running enable OSC_HP */\r
 371   if(!((SCU_PLL->PLLSTAT) & \r
 372                          (SCU_PLL_PLLSTAT_PLLHV_Msk | \r
 373         SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk)))\r
 374   {\r
 375           if (SCU_PLL_CLOCK_INPUT == SCU_CLOCK_CRYSTAL)\r
 376           {\r
 377         \r
 378            SCU_OSC->OSCHPCTRL = (OSC_HP_MODE<<4);        /*enable the OSC_HP*/\r
 379            /* setup OSC WDG devider */\r
 380            SCU_OSC->OSCHPCTRL |= (OSCHPWDGDIV<<16);         \r
 381            /* select external OSC as PLL input */\r
 382            SCU_PLL->PLLCON2 &= ~SCU_PLL_PLLCON2_PINSEL_Msk;\r
 383            /* restart OSC Watchdog */\r
 384            SCU_PLL->PLLCON0 &= ~SCU_PLL_PLLCON0_OSCRES_Msk;  \r
 385         \r
 386            do \r
 387            {\r
 388                 ;  /* here a timeout need to be added */\r
 389            }while(!((SCU_PLL->PLLSTAT) & (SCU_PLL_PLLSTAT_PLLHV_Msk | \r
 390                SCU_PLL_PLLSTAT_PLLLV_Msk |SCU_PLL_PLLSTAT_PLLSP_Msk))); \r
 391         \r
 392           }\r
 393   }\r
 394 \r
 395 \r
 396 /* Setup USB PLL */\r
 397    /* Go to bypass the Main PLL */\r
 398    SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_VCOBYP_Msk;\r
 399    /* disconnect OSC_FI to PLL */\r
 400    SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_FINDIS_Msk;\r
 401    /* Setup devider settings for main PLL */\r
 402    SCU_PLL->USBPLLCON = ((USBPLL_NDIV<<8) | (USBPLL_PDIV<<24));\r
 403    /* we may have to set OSCDISCDIS */\r
 404    SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_OSCDISCDIS_Msk;\r
 405    /* connect OSC_FI to PLL */\r
 406    SCU_PLL->USBPLLCON &= ~SCU_PLL_USBPLLCON_FINDIS_Msk;\r
 407    /* restart PLL Lock detection */\r
 408    SCU_PLL->USBPLLCON |= SCU_PLL_USBPLLCON_RESLD_Msk;\r
 409    /* wait for PLL Lock */\r
 410    while (!(SCU_PLL->USBPLLSTAT & SCU_PLL_USBPLLSTAT_VCOLOCK_Msk));\r
 411  }\r
 412 #endif