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重定向代码（.c）

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2018年2月3日 下午6:21

.c代码

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init.c

#include "s3c2440_soc.h"

void sdram_init(void)
{
	BWSCON = 0x22000000;

	BANKCON6 = 0x18001;
	BANKCON7 = 0x18001;

	REFRESH  = 0x8404f5;

	BANKSIZE = 0xb1;

	MRSRB6   = 0x20;
	MRSRB7   = 0x20;
}

#if 0


/**************************************************************************   
* 设置控制SDRAM的13个寄存器
* 使用位置无关代码
**************************************************************************/   
void memsetup(void)
{
	unsigned long *p = (unsigned long *)MEM_CTL_BASE;	
	p[0] = 0x22111110;		//BWSCON
	p[1] = 0x00000700;		//BANKCON0
	p[2] = 0x00000700;		//BANKCON1
	p[3] = 0x00000700;		//BANKCON2
	p[4] = 0x00000700;		//BANKCON3	
	p[5] = 0x00000700;		//BANKCON4
	p[6] = 0x00000700;		//BANKCON5
	p[7] = 0x00018005;		//BANKCON6
	p[8] = 0x00018005;		//BANKCON7
	p[9] = 0x008e07a3;		//REFRESH,HCLK=12MHz:0x008e07a3,HCLK=100MHz:0x008e04f4
	p[10] = 0x000000b2;		//BANKSIZE
	p[11] = 0x00000030;		//MRSRB6
	p[12] = 0x00000030;		//MRSRB7
}


#endif

void sdram_init2(void)
{
	unsigned int arr[] = {
		0x22000000, 	//BWSCON
		0x00000700, 	//BANKCON0
		0x00000700, 	//BANKCON1
		0x00000700, 	//BANKCON2
		0x00000700, 	//BANKCON3	
		0x00000700, 	//BANKCON4
		0x00000700, 	//BANKCON5
		0x18001, 	//BANKCON6
		0x18001, 	//BANKCON7
		0x8404f5, 	//REFRESH,HCLK=12MHz:0x008e07a3,HCLK=100MHz:0x008e04f4
		 0xb1,	//BANKSIZE
		 0x20,	//MRSRB6
		 0x20,	//MRSRB7

		};
	volatile unsigned int * p = (volatile unsigned int *)0x48000000;
	int i;

	for (i = 0; i < 13; i++)
	{
		*p = arr[i];
		p++;
	}
	
}


int sdram_test(void)
{
	volatile unsigned char *p = (volatile unsigned char *)0x30000000;
	int i;

	// write sdram
	for (i = 0; i < 1000; i++)
		p[i] = 0x55;

	// read sdram
	for (i = 0; i < 1000; i++)
		if (p[i] != 0x55)
			return -1;

	return 0;
}

void copy2sdram(void)
{
	/* 要从lds文件中获得 __code_start, __bss_start
	 * 然后从0地址把数据复制到__code_start
	 */

	extern int __code_start, __bss_start;

	volatile unsigned int *dest = (volatile unsigned int *)&__code_start;
	volatile unsigned int *end = (volatile unsigned int *)&__bss_start;
	volatile unsigned int *src = (volatile unsigned int *)0;

	while (dest < end)
	{
		*dest++ = *src++;
	}
}


void clean_bss(void)
{
	/* 要从lds文件中获得 __bss_start, _end
	 */
	extern int _end, __bss_start;

	volatile unsigned int *start = (volatile unsigned int *)&__bss_start;
	volatile unsigned int *end = (volatile unsigned int *)&_end;


	while (start <= end)
	{
		*start++ = 0;
	}
}
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led.c

#include "s3c2440_soc.h"

void delay(volatile int d)
{
	while (d--);
}

int led_test(void)
{
	int val = 0;  /* val: 0b000, 0b111 */
	int tmp;

	/* 设置GPFCON让GPF4/5/6配置为输出引脚 */
	GPFCON &= ~((3<<8) | (3<<10) | (3<<12));
	GPFCON |=  ((1<<8) | (1<<10) | (1<<12));

	/* 循环点亮 */
	while (1)
	{
		tmp = ~val;
		tmp &= 7;
		GPFDAT &= ~(7<<4);
		GPFDAT |= (tmp<<4);
		delay(100000);
		val++;
		if (val == 8)
			val =0;
		
	}

	return 0;
}
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main.c

#include "s3c2440_soc.h"
#include "uart.h"
#include "init.h"

char g_Char = 'A';
char g_Char3 = 'a';
const char g_Char2 = 'B';
int g_A = 0;
int g_B;

int main(void)
{
	uart0_init();

	puts("\n\rg_A = ");
	printHex(g_A);
	puts("\n\r");

	while (1)
	{
#if 0		
		puts("\n\rg_Char = ");
		printHex(g_Char);
		puts("\n\r");


		puts("\n\rg_Char3 = ");
		printHex(g_Char3);
		puts("\n\r");
#endif
		putchar(g_Char);
		g_Char++;

		putchar(g_Char3);
		g_Char3++;
		delay(1000000);
	}
	return 0;
}
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uart.c

#include "s3c2440_soc.h"


/* 115200,8n1 */
void uart0_init()
{
	/* 设置引脚用于串口 */
	/* GPH2,3用于TxD0, RxD0 */
	GPHCON &= ~((3<<4) | (3<<6));
	GPHCON |= ((2<<4) | (2<<6));

	GPHUP &= ~((1<<2) | (1<<3));  /* 使能内部上拉 */
	

	/* 设置波特率 */
	/* UBRDIVn = (int)( UART clock / ( buad rate x 16) ) –1
	 *  UART clock = 50M
	 *  UBRDIVn = (int)( 50000000 / ( 115200 x 16) ) –1 = 26
	 */
	UCON0 = 0x00000005; /* PCLK,中断/查询模式 */
	UBRDIV0 = 26;

	/* 设置数据格式 */
	ULCON0 = 0x00000003; /* 8n1: 8个数据位, 无较验位, 1个停止位 */

	/*  */

}

int putchar(int c)
{
	/* UTRSTAT0 */
	/* UTXH0 */

	while (!(UTRSTAT0 & (1<<2)));
	UTXH0 = (unsigned char)c;
	
}

int getchar(void)
{
	while (!(UTRSTAT0 & (1<<0)));
	return URXH0;
}

int puts(const char *s)
{
	while (*s)
	{
		putchar(*s);
		s++;
	}
}

/* 0xABCDEF12 */
void printHex(unsigned int val)
{
	int i;
	unsigned char arr[8];

	/* 先取出每一位的值 */
	for (i = 0; i < 8; i++)
	{
		arr[i] = val & 0xf;
		val >>= 4;   /* arr[0] = 2, arr[1] = 1, arr[2] = 0xF */
	}

	/* 打印 */
	puts("0x");
	for (i = 7; i >=0; i--)
	{
		if (arr[i] >= 0 && arr[i] <= 9)
			putchar(arr[i] + '0');
		else if(arr[i] >= 0xA && arr[i] <= 0xF)
			putchar(arr[i] - 0xA + 'A');
	}
}