/* ---------------------------------------------------------------------------- | |
* ATMEL Microcontroller Software Support | |
* ---------------------------------------------------------------------------- | |
* Copyright (c) 2008, Atmel Corporation | |
* | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are met: | |
* | |
* - Redistributions of source code must retain the above copyright notice, | |
* this list of conditions and the disclaimer below. | |
* | |
* Atmel's name may not be used to endorse or promote products derived from | |
* this software without specific prior written permission. | |
* | |
* 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. | |
* ---------------------------------------------------------------------------- | |
*/ | |
//------------------------------------------------------------------------------ | |
// Headers | |
//------------------------------------------------------------------------------ | |
#include "board.h" | |
#include "board_memories.h" | |
//------------------------------------------------------------------------------ | |
// Local definitions | |
//------------------------------------------------------------------------------ | |
//------------------------------------------------------------------------------ | |
/// \page "SAM9XE - Oscillator & PLL Parameters" | |
/// This page lists the parameters which are set for the PLL and main | |
/// oscillator configuration. | |
/// | |
/// !Parameters | |
/// - BOARD_OSCOUNT | |
/// - BOARD_CKGR_PLLA | |
/// - BOARD_PLLACOUNT | |
/// - BOARD_MULA | |
/// - BOARD_DIVA | |
/// - BOARD_CKGR_PLLB | |
/// - BOARD_PLLBCOUNT | |
/// - BOARD_MULB | |
/// - BOARD_DIVB | |
/// - BOARD_USBDIV | |
/// - BOARD_PRESCALER | |
/// Main oscillator startup time (in number of slow clock ticks). | |
#define BOARD_OSCOUNT (AT91C_CKGR_OSCOUNT & (64 << 8)) | |
/// PLLA frequency range. | |
#define BOARD_CKGR_PLLA (AT91C_CKGR_SRCA | AT91C_CKGR_OUTA_2) | |
/// PLLA startup time (in number of slow clock ticks). | |
#define BOARD_PLLACOUNT (63 << 8) | |
/// PLLA MUL value. | |
#define BOARD_MULA (AT91C_CKGR_MULA & (96 << 16)) | |
/// PLLA DIV value. | |
#define BOARD_DIVA (AT91C_CKGR_DIVA & 9) | |
/// PLLB frequency range | |
#define BOARD_CKGR_PLLB AT91C_CKGR_OUTB_1 | |
/// PLLB startup time (in number of slow clock ticks). | |
#define BOARD_PLLBCOUNT BOARD_PLLACOUNT | |
/// PLLB MUL value. | |
#define BOARD_MULB (124 << 16) | |
/// PLLB DIV value. | |
#define BOARD_DIVB 12 | |
/// USB PLL divisor value to obtain a 48MHz clock. | |
#define BOARD_USBDIV AT91C_CKGR_USBDIV_2 | |
/// Master clock prescaler value. | |
#define BOARD_PRESCALER AT91C_PMC_MDIV_2 | |
//------------------------------------------------------------------------------ | |
//------------------------------------------------------------------------------ | |
// Local functions | |
//------------------------------------------------------------------------------ | |
//------------------------------------------------------------------------------ | |
/// Default spurious interrupt handler | |
//------------------------------------------------------------------------------ | |
void DefaultSpuriousHandler(void) | |
{ | |
while (1); | |
} | |
//------------------------------------------------------------------------------ | |
/// Default handler for fast interrupt requests. | |
//------------------------------------------------------------------------------ | |
void DefaultFiqHandler(void) | |
{ | |
while (1); | |
} | |
//------------------------------------------------------------------------------ | |
/// Default handler for standard interrupt requests. | |
//------------------------------------------------------------------------------ | |
void DefaultIrqHandler(void) | |
{ | |
while (1); | |
} | |
//------------------------------------------------------------------------------ | |
// Global functions | |
//------------------------------------------------------------------------------ | |
//------------------------------------------------------------------------------ | |
/// Performs the low-level initialization of the chip. | |
//------------------------------------------------------------------------------ | |
void LowLevelInit(void) | |
{ | |
unsigned char i; | |
// Set flash wait states | |
//---------------------- | |
AT91C_BASE_EFC->EFC_FMR = 6 << 8; | |
//#if !defined(sdram) | |
// 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)); | |
//#endif //#if !defined(sdram) | |
// Initialize AIC | |
//--------------- | |
AT91C_BASE_AIC->AIC_IDCR = 0xFFFFFFFF; | |
AT91C_BASE_AIC->AIC_SVR[0] = (unsigned int) DefaultFiqHandler; | |
for (i = 1; i < 31; i++) { | |
AT91C_BASE_AIC->AIC_SVR[i] = (unsigned int) DefaultIrqHandler; | |
} | |
AT91C_BASE_AIC->AIC_SPU = (unsigned int) DefaultSpuriousHandler; | |
// Unstack nested interrupts | |
for (i = 0; i < 8 ; i++) { | |
AT91C_BASE_AIC->AIC_EOICR = 0; | |
} | |
// Watchdog initialization | |
//------------------------ | |
AT91C_BASE_WDTC->WDTC_WDMR = AT91C_WDTC_WDDIS; | |
// Remap | |
//------ | |
BOARD_RemapRam(); | |
// Disable RTT and PIT interrupts (potential problem when program A | |
// configures RTT, then program B wants to use PIT only, interrupts | |
// from the RTT will still occur since they both use AT91C_ID_SYS) | |
AT91C_BASE_RTTC->RTTC_RTMR &= ~(AT91C_RTTC_ALMIEN | AT91C_RTTC_RTTINCIEN); | |
AT91C_BASE_PITC->PITC_PIMR &= ~AT91C_PITC_PITIEN; | |
} | |