init.c

ARM9 9200 IDE 程序

//*----------------------------------------------------------------------------
//*         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            : ODi   06/26/2002
//*
//*----------------------------------------------------------------------------

#include "AT91RM9200.h"
#include "lib_AT91RM9200.h"

#define AT91C_MASTER_CLOCK 60000000 // Processor clock set by the loader: 60MHz
//*----------------------------------------------------------------------------
//* \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_InitEBI_SMC2_ForIDE
//* \brief Initialization of the Static Memory Controller for Chip Select 4
//*----------------------------------------------------------------------------
__inline void AT91F_InitEBI_SMC2_ForIDE()
{
	// Setup NCS4 for IDE (EBI->SMC2) 
	AT91C_BASE_SMC2->SMC2_CSR[4] = (AT91C_SMC2_NWS & 0x4)  | AT91C_SMC2_WSEN | \
	                               (AT91C_SMC2_TDF & 0x200)| AT91C_SMC2_BAT  | \
	                                AT91C_SMC2_DBW_16;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//*----------------------------------------------------------------------------
void AT91F_LowLevelInit()
{

	// Open PIO for DBGU
	AT91F_DBGU_CfgPIO();
	
	// Configure DBGU
	AT91F_US_Configure (
		(AT91PS_USART) AT91C_BASE_DBGU,          // DBGU base address
		AT91C_MASTER_CLOCK,            // 60 MHz
		AT91C_US_ASYNC_MODE ,        // mode Register to be programmed
		115200 ,                   // baudrate to be programmed
		0);                        // timeguard to be programmed

	// Enable Transmitter
	AT91F_US_EnableTx((AT91PS_USART) AT91C_BASE_DBGU);
	AT91F_US_EnableRx((AT91PS_USART) AT91C_BASE_DBGU);
	AT91F_InitEBI_SMC2_ForIDE();	

	AT91F_DBGU_Printk("AT91F_LowLevelInit()\n\r");
}