init.c

ARM外围FLASH 以及SDRAM烧写程序 完整的程序 可能对大家硬件编程有点帮助

//*----------------------------------------------------------------------------
//*         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           : init.c
//* Object              : Low level initialisations written in C
//* Creation            : FB   13/01/2003
//*
//*----------------------------------------------------------------------------

#include <AT91RM9200.h>
#include <lib_AT91RM9200.h>

#define	MCK			60000000
#define BAUDRATE	115200

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_Printk
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Printk(
	char *buffer) // \arg pointer to a string ending by \0
{
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
		AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, *buffer++);
	}
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_SpuriousHandler() 
{
	AT91F_DBGU_Printk("-F- Spurious Interrupt detected\n\r");
	while (1);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_DataAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_DataAbort() 
{
	AT91F_DBGU_Printk("-F- Data Abort detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_FetchAbort
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_FetchAbort()
{
	AT91F_DBGU_Printk("-F- Prefetch Abort detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_Undef
//* \brief This function reports an Abort
//*----------------------------------------------------------------------------
void AT91F_Undef() 
{
	AT91F_DBGU_Printk("-F- Undef detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_UndefHandler
//* \brief This function reports that no handler have been set for current IT
//*----------------------------------------------------------------------------
void AT91F_UndefHandler() 
{
	AT91F_DBGU_Printk("-F- Undef detected\n\r");
	while (1);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_InitEBI_SMC2_ForDisplayController
//* \brief Initialization of the Static Memory Controller for Chip Select 3
//*----------------------------------------------------------------------------
__inline void AT91F_InitEBI_SMC2_ForDisplayController()
{
	// Setup NCS3 for Memory Display Controller (EBI->SMC2) 
	AT91C_BASE_SMC2->SMC2_CSR[3] = (AT91C_SMC2_NWS & 0x4) | AT91C_SMC2_WSEN
									| (AT91C_SMC2_TDF & 0x100) | AT91C_SMC2_DBW;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DisplayController_CfgPIO
//* \brief Configure PIO controllers to drive Graphic signals
//*----------------------------------------------------------------------------
__inline void AT91F_DisplayController_CfgPIO (void)
{
	// Set in Periph mode the correspondant pins
	AT91F_PIO_CfgPeriph(
		AT91C_BASE_PIOC, // PIO controller base address
		((unsigned int) AT91C_PC6_NWAIT) // Peripheral A
		,0 );  
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//*----------------------------------------------------------------------------
void AT91F_LowLevelInit()
{
	// Init Interrupt Controller
	AT91F_AIC_Open(
		AT91C_BASE_AIC,          // pointer to the AIC registers
		AT91C_AIC_BRANCH_OPCODE, // IRQ exception vector
		AT91F_UndefHandler,      // FIQ exception vector
		AT91F_UndefHandler,      // AIC default handler
		AT91F_SpuriousHandler,   // AIC spurious handler
		0);                      // Protect mode

	// Perform 8 End Of Interrupt Command to make s齬e AIC will not Lock out nIRQ 
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);
	AT91F_AIC_AcknowledgeIt(AT91C_BASE_AIC);

	AT91F_AIC_SetExceptionVector((unsigned int *)0x0C, AT91F_FetchAbort);
	AT91F_AIC_SetExceptionVector((unsigned int *)0x10, AT91F_DataAbort);
	AT91F_AIC_SetExceptionVector((unsigned int *)0x4, AT91F_Undef);

	// Configure PIO A to periph mode for IrDA problem of consumption
	// Not associated to the configuration of Memory Display Controller 
	AT91F_PIO_CfgPeriph(
		AT91C_BASE_PIOA, // PIO controller base address
		((unsigned int) AT91C_PA23_TXD2), // Peripheral A
		0); // Peripheral B

	// Disable pullup
	AT91F_PIO_CfgOutput(AT91C_BASE_PIOA,AT91C_PA23_TXD2);
	AT91C_BASE_PIOA->PIO_PPUDR =AT91C_PA23_TXD2;

	/////////////////////////////////////////////////////////////////////////////////////
	// Init Static Memory Controller SMC2 for Memory Display Controller (EBI->SMC2->NCS3)
	AT91F_InitEBI_SMC2_ForDisplayController();

	// Init PIO for Memory Display Controller 
	AT91F_DisplayController_CfgPIO();
	/////////////////////////////////////////////////////////////////////////////////////
	
	// Open PIO for DBGU
	AT91F_DBGU_CfgPIO();

	// Configure DBGU
	AT91F_US_Configure (
		(AT91PS_USART) AT91C_BASE_DBGU, // DBGU base address
		MCK,             				// MCK
		AT91C_US_ASYNC_MODE,  			// mode Register to be programmed
		BAUDRATE ,              		// baudrate to be programmed
		0);                   			// timeguard to be programmed

	// Enable Transmitter
	AT91F_US_EnableTx((AT91PS_USART) AT91C_BASE_DBGU);

	AT91F_DBGU_Printk("\n\r\n\r-I- AT91F_LowLevelInit() done\n\r");
}