pmc.c

AT91RM9260PMC程序,程序和ATMEL9260EK开发板配套

/*-----------------------------------------------------------------------------
 *           ATMEL Microcontroller Software Support  -  ROUSSET  -
 *-----------------------------------------------------------------------------
 * DISCLAIMER:  THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
 * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *----------------------------------------------------------------------------
 * File Name           : pmc.c
 * Object              : PMC utilities function
 * Creation            : JPP
 *----------------------------------------------------------------------------
*/
#include "project.h"
#include "pmc.h"

//*----------------------------------------------------------------------------
//* \fn    AT91F_PMC_Change_PPLA
//* \brief Write a value to PLLA and wait Ready
//*----------------------------------------------------------------------------
void AT91F_PMC_Change_PPLA(unsigned int Value)
{
   AT91C_BASE_CKGR->CKGR_PLLAR= Value;
	// Wait until the master clock is established for the case we already
	// turn on the PLL
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_LOCKA));
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_MCKRDY));
}
//*----------------------------------------------------------------------------
//* \fn    AT91F_PMC_Change_PPLB
//* \brief Write a value to PLLB and wait Ready
//*----------------------------------------------------------------------------
void AT91F_PMC_Change_PPLB(unsigned int Value)
{
    AT91C_BASE_CKGR->CKGR_PLLBR= Value;
	// Wait until the master clock is established for the case we already
	// turn on the PLL
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_LOCKB));
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_MCKRDY));
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_PMC_SwitchMasterClock
//* \brief Set the New CSS field to AT91C_PMC_MCKR And wait ready
//*        Return the new master clock
//*----------------------------------------------------------------------------
unsigned int AT91F_PMC_SwitchMasterClock(unsigned int css)
{
    unsigned int clock,mdiv;
    *AT91C_PMC_MCKR = (*AT91C_PMC_MCKR &~AT91C_PMC_CSS) | css ;
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_LOCKA));
    while (!(AT91C_BASE_PMC->PMC_SR  & AT91C_PMC_MCKRDY));
    mdiv= (*AT91C_PMC_MCKR >> 8) * 2;
	if (mdiv == 0) mdiv =1;
    clock = AT91F_PMC_GetProcessorClock(AT91C_BASE_PMC,AT91C_BASE_CKGR,AT91B_SLOW_OSC);
    return clock/mdiv;
}