device.c

AT91SAM9261的USB设备驱动程序

//------------------------------------------------------------------------------
//      Includes
//------------------------------------------------------------------------------

#include "common.h"
#include "device.h"
#include "board.h"

//------------------------------------------------------------------------------
//      Exported functions
//------------------------------------------------------------------------------
//------------------------------------------------------------------------------
// \brief   Low-level initialization of the chip.
//------------------------------------------------------------------------------
void DEV_Init(void)
{
    // PIO Controller initialization for low-power consumption
    // PIO Controller initialization for low-power consumption

#if defined(AT91SAM7SEK) || defined(AT91SAM7SEEK) || defined(AT91SAM7XEK)
    // PIOA
    // Set to 1 output PIO
    AT91F_PIO_SetOutput( AT91C_BASE_PIOA, 0xFFFFFFFF );
    // Enable PIO in output mode
    AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, 0xFFFFFFFF );
    // Disable pullup on PIO
    AT91F_PIO_CfgPullup( AT91C_BASE_PIOA, 0x00000000 );
#endif

#if defined(AT91SAM7SEEK) || defined (AT91SAM7XEK)
    // PIOB
    // Set to 1 output PIO
    AT91F_PIO_SetOutput( AT91C_BASE_PIOB, 0xFFFFFFFF );
    // Enable PIO in output mode
    AT91F_PIO_CfgOutput( AT91C_BASE_PIOB, 0xFFFFFFFF );
    // Disable pullup on PIO
    AT91F_PIO_CfgPullup( AT91C_BASE_PIOB, 0x00000000 );
#endif

#if defined(AT91SAM7SEEK)
    // PIOC
    // Set to 1 output PIO
    AT91F_PIO_SetOutput( AT91C_BASE_PIOC, 0xFFFFFFFF );
    // Enable PIO in output mode
    AT91F_PIO_CfgOutput( AT91C_BASE_PIOC, 0xFFFFFFFF );
    // Disable pullup on PIO
    AT91F_PIO_CfgPullup( AT91C_BASE_PIOC, 0x00000000 );
#endif

#if !defined(AT91RM9200)
    // Disable the watchdog
    AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;

    // Enable user reset: assertion length programmed to 1ms
    AT91C_BASE_RSTC->RSTC_RMR = AT91C_RSTC_URSTEN | (0x4 << 8)
                                | ((unsigned int) 0xA5 << 24);
#endif

    // Flash wait states
    BRD_SetFlashWaitStates();

    // Start clocks
    DEV_Resume();
}

/*
    Constants: Clock and PLL settings

        BOARD_OSCOUNT - Startup time of main oscillator (in number of slow clock
                        ticks). 
        BOARD_USBDIV - USB PLL divisor value to obtain a 48MHz clock.
        BOARD_CKGR_PLL - PLL frequency range.
        BOARD_PLLCOUNT - PLL startup time (in number of slow clock ticks).
        BOARD_MUL - PLL MUL value.
        BOARD_DIV - PLL DIV value.
        BOARD_PRESCALER - Master clock prescaler value.
*/
#define BOARD_OSCOUNT           (AT91C_CKGR_OSCOUNT & (64 << 8))
#define BOARD_CKGR_PLLA         (AT91C_CKGR_SRCA | AT91C_CKGR_OUTA_2)
#define BOARD_PLLACOUNT         (63 << 8)
#define BOARD_MULA              (AT91C_CKGR_MULA & (96 << 16))
#define BOARD_DIVA              (AT91C_CKGR_DIVA & 9)
#define BOARD_PRESCALER         AT91C_PMC_MDIV_2

#define BOARD_USBDIV            AT91C_CKGR_USBDIV_2
#define BOARD_CKGR_PLLB         AT91C_CKGR_OUTB_0
#define BOARD_PLLBCOUNT         BOARD_PLLACOUNT
#define BOARD_MULB              (124 << 16)
#define BOARD_DIVB              12
//------------------------------------------------------------------------------
// \brief   Puts the device back into a normal operation mode
//------------------------------------------------------------------------------
void DEV_Resume(void)
{




   // AT91C_BASE_PMC->PMC_IDR = 0xFFFFFFFF;

    // Setup the PLL A
   // AT91C_BASE_CKGR->CKGR_PLLAR = 0x2060BF09; // crystal= 18.432MHz

   // while (!(*AT91C_PMC_SR & AT91C_PMC_LOCKA));

    // Switch Master Clock from PLLB to PLLA/2
   // AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_PLLA_CLK | AT91C_PMC_PRES_CLK
   //                          | AT91C_PMC_MDIV_3;
   // while (!(*AT91C_PMC_SR & AT91C_PMC_MCKRDY));
    /* Initialize main oscillator
     ****************************/
    AT91C_BASE_PMC->PMC_MOR = BOARD_OSCOUNT | AT91C_CKGR_MOSCEN;
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS));

    /* Initialize PLLA at 200MHz (198.656) */
    AT91C_BASE_PMC->PMC_PLLAR = BOARD_CKGR_PLLA
                                | BOARD_PLLACOUNT
                                | BOARD_MULA
                                | BOARD_DIVA;
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKA));

    // Initialize PLLB for USB usage
    AT91C_BASE_PMC->PMC_PLLBR = BOARD_USBDIV
                                | BOARD_CKGR_PLLB
                                | BOARD_PLLBCOUNT
                                | BOARD_MULB
                                | BOARD_DIVB;
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCKB));

    /* Wait for the master clock if it was already initialized */
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));

    /* Switch to fast clock
     **********************/
    /* Switch to main oscillator + prescaler */
    AT91C_BASE_PMC->PMC_MCKR = BOARD_PRESCALER;
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));

    /* Switch to PLL + prescaler */
    AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLLA_CLK;
    while (!(AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY));


AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS;

    // Enable user reset: assertion length programmed to 1ms
    AT91C_BASE_RSTC->RSTC_RMR = AT91C_RSTC_URSTEN | (0x4 << 8)
                                | ((unsigned int) 0xA5 << 24);
}

//------------------------------------------------------------------------------
// \brief   Puts the device into low-power mode.
//------------------------------------------------------------------------------
void DEV_Suspend()
{

}