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First version under SVN is V4.0.1

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Richard Barry 2006-05-02 09:39:15 +00:00
parent 243393860c
commit b6df57c7e3
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94
Demo/uIP_Demo_IAR_ARM7/SrcIAR/Cstartup_SAM7.c Normal file
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//*----------------------------------------------------------------------------
//* ATMEL Microcontroller Software Support - ROUSSET -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name : Cstartup_SAM7.c
//* Object : Low level initializations written in C for IAR
//* tools
//* 1.0 08/Sep/04 JPP : Creation
//* 1.10 10/Sep/04 JPP : Update AT91C_CKGR_PLLCOUNT filed
//*----------------------------------------------------------------------------
// Include the board file description
#include "Board.h"
//#include "init.h"
#include <string.h>
// The following functions must be write in ARM mode this function called directly
// by exception vector
extern void AT91F_Spurious_handler(void);
extern void AT91F_Default_IRQ_handler(void);
extern void AT91F_Default_FIQ_handler(void);
//*----------------------------------------------------------------------------
//* \fn AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//* this function can be use a Stack, depending the compilation
//* optimization mode
//*----------------------------------------------------------------------------
void AT91F_LowLevelInit( void);
void AT91F_LowLevelInit( void ) @ "ICODE"
{
int i;
AT91PS_PMC pPMC = AT91C_BASE_PMC;
//* Set Flash Waite sate
// Single Cycle Access at Up to 30 MHz, or 40
// if MCK = 47923200 I have 50 Cycle for 1 useconde ( flied MC_FMR->FMCN
AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN)&(75 <<16)) | AT91C_MC_FWS_1FWS ;
//* Watchdog Disable
AT91C_BASE_WDTC->WDTC_WDMR= AT91C_WDTC_WDDIS;
// If we are running off a j-link then the PLL will have already been setup.
if( !( pPMC->PMC_MCKR & AT91C_PMC_CSS_PLL_CLK ) )
{
//* Set MCK at 47 923 200
// 1 Enabling the Main Oscillator:
// SCK = 1/32768 = 30.51 uSeconde
// Start up time = 8 * 6 / SCK = 56 * 30.51 = 1,46484375 ms
pPMC->PMC_MOR = (( AT91C_CKGR_OSCOUNT & (0x06 <<8) | AT91C_CKGR_MOSCEN ));
// Wait the startup time
while(!(pPMC->PMC_SR & AT91C_PMC_MOSCS));
// 2 Checking the Main Oscillator Frequency (Optional)
// 3 Setting PLL and divider:
// - div by 5 Fin = 3,6864 =(18,432 / 5)
// - Mul 25+1: Fout = 95,8464 =(3,6864 *26)
// for 96 MHz the erroe is 0.16%
//eld out NOT USED = 0 Fi
pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 5) |
(AT91C_CKGR_PLLCOUNT & (28<<8)) |
(AT91C_CKGR_MUL & (25<<16)));
// Wait the startup time
while(!(pPMC->PMC_SR & AT91C_PMC_LOCK));
// 4. Selection of Master Clock and Processor Clock
// select the PLL clock divided by 2
pPMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2 ;
while(!(pPMC->PMC_SR & AT91C_PMC_MCKRDY));
pPMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK ;
while(!(pPMC->PMC_SR & AT91C_PMC_MCKRDY));
}
// Set up the default interrupts handler vectors
AT91C_BASE_AIC->AIC_SVR[0] = (int) AT91F_Default_FIQ_handler ;
for (i=1;i < 31; i++)
{
AT91C_BASE_AIC->AIC_SVR[i] = (int) AT91F_Default_IRQ_handler ;
}
AT91C_BASE_AIC->AIC_SPU = (int) AT91F_Spurious_handler ;
}