diff options
Diffstat (limited to 'openpicc/os/boot/Cstartup_SAM7.c')
| -rw-r--r-- | openpicc/os/boot/Cstartup_SAM7.c | 101 |
1 files changed, 62 insertions, 39 deletions
diff --git a/openpicc/os/boot/Cstartup_SAM7.c b/openpicc/os/boot/Cstartup_SAM7.c index 450a95e..4ab263f 100644 --- a/openpicc/os/boot/Cstartup_SAM7.c +++ b/openpicc/os/boot/Cstartup_SAM7.c @@ -8,60 +8,83 @@ //* 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 +//* Object : Low level initializations written in C for GCC Tools +//* Creation : 12/Jun/04 +//* 1.2 28/Feb/05 JPP : LIB change AT91C_WDTC_WDDIS & PLL +//* 1.3 21/Mar/05 JPP : Change PLL Wait time //*---------------------------------------------------------------------------- - // Include the board file description #include <board.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) { - AT91PS_PMC pPMC = AT91C_BASE_PMC; - - //* Set flash wait state - // 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; + volatile int i; + + //* Debounce power supply + for(i=0;i<1024;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 usecond ( flied MC_FMR->FMCN + AT91C_BASE_MC->MC_FMR = ((AT91C_MC_FMCN) & (48 << 16)) | AT91C_MC_FWS_1FWS; - //* Watchdog Enable - AT91C_BASE_WDTC->WDTC_WDMR = (0x80 << 16) | AT91C_WDTC_WDRSTEN | 0x80; + //* Set MCK at 47 923 200 + // 1 Enabling the Main Oscillator: + // SCK = 1/32768 = 30.51 uSecond + // 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 24 Fin = 0,7680 =(18,432 / 24) + // - Mul 125: Fout = 96,0000 =(0,7680 *125) + // for 96 MHz the erroe is 0.16% + // Field out NOT USED = 0 + // PLLCOUNT pll startup time estimate at : 0.844 ms + // PLLCOUNT 28 = 0.000844 /(1/32768) +#if 0 + pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x05) | + (AT91C_CKGR_PLLCOUNT & (28 << 8)) | + (AT91C_CKGR_MUL & (25 << 16))); +#else + pPMC->PMC_PLLR = ((AT91C_CKGR_DIV & 24) | + (AT91C_CKGR_PLLCOUNT & (28 << 8)) | + (AT91C_CKGR_MUL & (125 << 16))); +#endif - //* 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 + // Wait the startup time + while (!(pPMC->PMC_SR & AT91C_PMC_LOCK)); + while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); + // 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)); - 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))); + pPMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK; + while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); - // 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)); + // 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; - pPMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK; - while (!(pPMC->PMC_SR & AT91C_PMC_MCKRDY)); } |