From 633c646ab36368caf6eaeedd326d9f1835196afd Mon Sep 17 00:00:00 2001 From: henryk Date: Tue, 6 Nov 2007 20:26:48 +0000 Subject: Initial import of FreeRTOS code for OpenPICC git-svn-id: https://svn.openpcd.org:2342/trunk@311 6dc7ffe9-61d6-0310-9af1-9938baff3ed1 --- openpicc/os/boot/Cstartup_SAM7.c | 67 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) create mode 100644 openpicc/os/boot/Cstartup_SAM7.c (limited to 'openpicc/os/boot/Cstartup_SAM7.c') diff --git a/openpicc/os/boot/Cstartup_SAM7.c b/openpicc/os/boot/Cstartup_SAM7.c new file mode 100644 index 0000000..450a95e --- /dev/null +++ b/openpicc/os/boot/Cstartup_SAM7.c @@ -0,0 +1,67 @@ +//*---------------------------------------------------------------------------- +//* 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 + +//*---------------------------------------------------------------------------- +//* \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) +{ + 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; + + //* 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 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)); +} -- cgit v1.2.3