C++ (Cpp) TCM_Disable Examples

Example #1

File: startup_samv71.c Project: woo2/gatekeeper-v2

void Reset_Handler(void)
{
   uint32_t *src;
   uint32_t *dest;

   //System initialization
   SystemInit();

   //Initialize the relocate segment
   src = &_etext;
   dest = &_srelocate;

   if(src != dest)
   {
      while(dest < &_erelocate)
      {
         *dest++ = *src++;
      }
   }

   //Clear the zero segment
   for(dest = &_szero; dest < &_ezero;)
   {
      *dest++ = 0;
   }

   //Set the vector table base address
   src = (uint32_t *) & _sfixed;
   SCB->VTOR = ((uint32_t) src & SCB_VTOR_TBLOFF_Msk);

#ifdef ENABLE_TCM 
   //32KB
   EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_CGPB | EEFC_FCR_FARG(8));
   EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_SGPB | EEFC_FCR_FARG(7));

   TCM_Enable();
#else
   EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_CGPB | EEFC_FCR_FARG(8));
   EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_CGPB | EEFC_FCR_FARG(7));

   TCM_Disable();
#endif

   //C library initialization
   __libc_init_array();

   //Branch to main function
   main();

   //Endless loop
   while(1);
}

Example #2

File: sysinit.c Project: djyos/djyos

// =============================================================================
// 功能：系统时钟初始化，主时钟配置为300MHz，外设时钟为150M
// 参数：无
// 返回：无
// =============================================================================
void SysClk_Init(void)
{
	uint32_t read_MOR;

	EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_CGPB | EEFC_FCR_FARG(8));
	EFC->EEFC_FCR = (EEFC_FCR_FKEY_PASSWD | EEFC_FCR_FCMD_CGPB | EEFC_FCR_FARG(7));

	TCM_Disable();

	/* Set FWS according to SYS_BOARD_MCKR configuration */
	EFC->EEFC_FMR = EEFC_FMR_FWS(5);

	 /* Before switching MAIN OSC on external crystal : enable it and don't
	 * disable at the same time RC OSC in case of if MAIN OSC is still using RC
	 * OSC
	 */

	read_MOR = PMC->CKGR_MOR;
	 /* enable external crystal - enable RC OSC */
	read_MOR |= (CKGR_MOR_KEY_PASSWD |CKGR_MOR_XT32KFME);
	PMC->CKGR_MOR = read_MOR;

	/* Select XTAL 32k instead of internal slow RC 32k for slow clock */
	if ( (SUPC->SUPC_SR & SUPC_SR_OSCSEL) != SUPC_SR_OSCSEL_CRYST )
	{
		SUPC->SUPC_CR = SUPC_CR_KEY_PASSWD | SUPC_CR_XTALSEL_CRYSTAL_SEL;

		while( !(SUPC->SUPC_SR & SUPC_SR_OSCSEL) );
	}

	/* Initialize main oscillator */
	if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) )
	{
	  PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD | SYS_BOARD_OSCOUNT
					| CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN;

	  while ( !(PMC->PMC_SR & PMC_SR_MOSCXTS) )
	  {
	  }
	}

	/* Switch to 3-20MHz Xtal oscillator */
	PMC->CKGR_MOR = CKGR_MOR_KEY_PASSWD | SYS_BOARD_OSCOUNT
					| CKGR_MOR_MOSCRCEN | CKGR_MOR_MOSCXTEN | CKGR_MOR_MOSCSEL;

	while ( !(PMC->PMC_SR & PMC_SR_MOSCSELS) )
	{
	}

	PMC->PMC_MCKR = (PMC->PMC_MCKR & ~(uint32_t)PMC_MCKR_CSS_Msk)
					| PMC_MCKR_CSS_MAIN_CLK;

	while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
	{
	}

	/* Initialize PLLA */
	PMC->CKGR_PLLAR = SYS_BOARD_PLLAR;
	while ( !(PMC->PMC_SR & PMC_SR_LOCKA) )
	{
	}

	/* Switch to main clock */
	PMC->PMC_MCKR = (SYS_BOARD_MCKR & ~PMC_MCKR_CSS_Msk) | PMC_MCKR_CSS_MAIN_CLK;
	while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
	{
	}

	/* Switch to PLLA */
	PMC->PMC_MCKR = SYS_BOARD_MCKR;
	while ( !(PMC->PMC_SR & PMC_SR_MCKRDY) )
	{
	}

//	SystemCoreClock = CHIP_FREQ_CPU_MAX;
}