/**
* \brief Enable UPLL clock.
*/
void pmc_enable_upll_clock(void)
{
PMC->CKGR_UCKR = CKGR_UCKR_UPLLCOUNT(3) | CKGR_UCKR_UPLLEN;
/* Wait UTMI PLL Lock Status */
while (!(PMC->PMC_SR & PMC_SR_LOCKU));
}
/**
* Configure USBHS settings for USB device
*/
static void _ConfigureUotghs(void)
{
/* UTMI parallel mode, High/Full/Low Speed */
/* UUSBCK not used in this configuration (High Speed) */
PMC->PMC_SCDR = PMC_SCDR_USBCLK;
/* USB clock register: USB Clock Input is UTMI PLL */
PMC->PMC_USB = PMC_USB_USBS;
/* Enable peripheral clock for USBHS */
PMC_EnablePeripheral(ID_USBHS);
USBHS->USBHS_CTRL = USBHS_CTRL_UIMOD_DEVICE;
/* Enable PLL 480 MHz */
PMC->CKGR_UCKR = CKGR_UCKR_UPLLEN | CKGR_UCKR_UPLLCOUNT(0xF);
/* Wait that PLL is considered locked by the PMC */
while( !(PMC->PMC_SR & PMC_SR_LOCKU) );
/* IRQ */
NVIC_EnableIRQ(USBHS_IRQn) ;
}
/**
* \brief UOTGHS Library Example Application entry point.
*
* \return 42 Fatal error.
*/
extern int main( void )
{
/* Disable watchdog */
WDT_Disable( WDT ) ;
/* UTMI parallel mode, High/Full/Low Speed */
/* UOTGCK not used in this configuration (High Speed) */
PMC->PMC_SCDR = PMC_SCDR_UOTGCK;
/* USB clock register: USB Clock Input is UTMI PLL */
PMC->PMC_USB = PMC_USB_USBS;
/* USBS: USB Input Clock Selection: USB Clock Input is PLLA */
/* Enable peripheral clock for UOTGHS */
PMC_EnablePeripheral(UOTGHS_IRQn);
UOTGHS->UOTGHS_CTRL = 0x0;
/* Enable PLL 480 MHz */
PMC->CKGR_UCKR = CKGR_UCKR_UPLLEN | CKGR_UCKR_UPLLCOUNT(0xF);
/* Wait that PLL is considered locked by the PMC */
while( !(PMC->PMC_SR & PMC_SR_LOCKU) );
/* Enable peripheral clock for UOTGHS */
PMC_EnablePeripheral(UOTGHS_IRQn);
/* Output example information */
printf( "-- UOTGHS Library Example %s --\n\r", SOFTPACK_VERSION ) ;
printf( "-- %s\n\r", BOARD_NAME ) ;
printf( "-- Compiled: %s %s --\n\r", __DATE__, __TIME__ ) ;
/* UOTGHS pins */
PIO_PinConfigure( pUOTGHSPins, PIO_LISTSIZE( pUOTGHSPins ) );
if ( PIO_PinGet(&pUOTGHS_Fault) == 0 )
{
TRACE_OTG("UOTGHS_Fault = 0 (active low ERROR FLAG !\r\n");
TRACE_OTG("Undervoltage, Soft Start, Overcurrent, or Overtemperature\r\n");
while(1);
}
/* Enable interrupt */
NVIC_EnableIRQ(UOTGHS_IRQn);
/* Initialize USB task */
usb_task_init();
#if USB_DEVICE_FEATURE == ENABLED
device_template_task_init();
#endif
#if USB_HOST_FEATURE == ENABLED
host_template_task_init();
#endif
#ifdef FREERTOS_USED
/* Start OS scheduler */
vTaskStartScheduler();
TRACE_OTG("FreeRTOS returned\n\r");
return 42;
#else
/* No OS here. Need to call each task in round-robin mode. */
while (TRUE)
{
usb_task();
#if USB_DEVICE_FEATURE == ENABLED
device_template_task();
#endif
#if USB_HOST_FEATURE == ENABLED
host_template_task();
#endif
}
#endif /* FREERTOS_USED */
}
/**
* \brief Performs the low-level initialization of the chip.
* This includes EFC and master clock configuration.
* It also enable a low level on the pin NRST triggers a user reset.
*/
extern WEAK void LowLevelInit( void )
{
uint32_t dwTimeout ;
/* Set 2 WS for Embedded Flash Access */
EFC0->EEFC_FMR = EEFC_FMR_FWS( 4 ) ;
EFC1->EEFC_FMR = EEFC_FMR_FWS( 4 ) ;
/* Initialize main oscillator */
if ( !(PMC->CKGR_MOR & CKGR_MOR_MOSCSEL) ) /* Main Oscillator Selection */
{
// 48MHz
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37)
| CKGR_MOR_MOSCXTST(0x8) /* Main Crystal Oscillator Start-up Time: 1.4ms(datasheet) */
| CKGR_MOR_MOSCRCEN /* Main On-Chip RC Oscillator Enable */
| CKGR_MOR_MOSCXTEN; /* Main Crystal Oscillator Enable */
/* The Main On-Chip RC Oscillator is selected */
dwTimeout = 0 ;
while ( !(PMC->PMC_SR & PMC_SR_MOSCXTS) && (dwTimeout++ < CLOCK_TIMEOUT) ) ;
}
/* Switch to 3-20MHz Xtal oscillator */
PMC->CKGR_MOR = CKGR_MOR_KEY(0x37)
| CKGR_MOR_MOSCXTST(0x8) /* Main Crystal Oscillator Start-up Time: 1.4ms(datasheet) */
| CKGR_MOR_MOSCRCEN /* Main On-Chip RC Oscillator Enable */
| CKGR_MOR_MOSCXTEN /* Main Crystal Oscillator Enable */
| CKGR_MOR_MOSCSEL; /* The Main Crystal Oscillator is selected */
dwTimeout = 0;
/* Wait Main Oscillator Selection Status */
while (!(PMC->PMC_SR & PMC_SR_MOSCSELS) && (dwTimeout++ < CLOCK_TIMEOUT));
PMC->PMC_MCKR = (PMC->PMC_MCKR & ~ (0x7UL << 0)/*AT91C_PMC_CSS*/)
| PMC_MCKR_CSS_MAIN_CLK; /* Main Clock is selected */
dwTimeout = 0;
/* Wait Master Clock Status */
while (!(PMC->PMC_SR & PMC_SR_MCKRDY) && (dwTimeout++ < CLOCK_TIMEOUT));
/* Initialize PLLA */
PMC->CKGR_PLLAR = CKGR_PLLAR_STUCKTO1
| CKGR_PLLAR_MULA(13) /* PLLA Multiplier */
| CKGR_PLLAR_PLLACOUNT(2) /* PLLA Counter 200µs(datasheet) */
| CKGR_PLLAR_DIVA(1); /* Divider */
dwTimeout = 0;
/* Wait PLL A Lock Status */
while (!(PMC->PMC_SR & PMC_SR_LOCKA) && (dwTimeout++ < CLOCK_TIMEOUT));
/* Initialize UTMI for USB usage, can be disabled if not using USB for the sake of saving power*/
PMC->CKGR_UCKR |= CKGR_UCKR_UPLLCOUNT(3) /* UTMI PLL Start-up Time */
| CKGR_UCKR_UPLLEN; /* UTMI PLL Enable */
dwTimeout = 0;
/* Wait UTMI PLL Lock Status */
while (!(PMC->PMC_SR & PMC_SR_LOCKU) && (dwTimeout++ < CLOCK_TIMEOUT));
/* Switch to PLLA*/
PMC->PMC_MCKR = ((PMC_MCKR_PRES_CLK_2 | PMC_MCKR_CSS_PLLA_CLK) & ~(0x7UL << 0)/*AT91C_PMC_CSS*/)
| PMC_MCKR_CSS_MAIN_CLK; /* Main Clock is selected */
dwTimeout = 0;
/* Wait Master Clock Status */
while (!(PMC->PMC_SR & PMC_SR_MCKRDY) && (dwTimeout++ < CLOCK_TIMEOUT));
PMC->PMC_MCKR = PMC_MCKR_PRES_CLK_2 /* Selected clock divided by 2 */
| PMC_MCKR_CSS_PLLA_CLK; /* PLLA Clock is selected */
dwTimeout = 0;
/* Wait Master Clock Status */
while (!(PMC->PMC_SR & PMC_SR_MCKRDY) && (dwTimeout++ < CLOCK_TIMEOUT));
}
