#define GPA0CON        0xE0200000
#define UCON0         0xE2900004
#define ULCON0         0xE2900000
#define UMCON0         0xE290000C
#define UFCON0         0xE2900008
#define UBRDIV0     0xE2900028
#define UDIVSLOT0    0xE290002C#define UTRSTAT0    0xE2900010
#define UTXH0        0xE2900020
#define URXH0        0xE2900024    #define rGPA0CON    (*(volatile unsigned int *)GPA0CON)
#define rUCON0        (*(volatile unsigned int *)UCON0)
#define rULCON0        (*(volatile unsigned int *)ULCON0)
#define rUMCON0        (*(volatile unsigned int *)UMCON0)
#define rUFCON0        (*(volatile unsigned int *)UFCON0)
#define rUBRDIV0    (*(volatile unsigned int *)UBRDIV0)
#define rUDIVSLOT0    (*(volatile unsigned int *)UDIVSLOT0)
#define rUTRSTAT0    (*(volatile unsigned int *)UTRSTAT0)
#define rUTXH0        (*(volatile unsigned int *)UTXH0)
#define rURXH0        (*(volatile unsigned int *)URXH0)
//串口初始化
void uart_init()
{    //初始化rx tx对应GPIO引脚rGPA0CON&=~(0xff<<0);//将 bit0~7清零rGPA0CON|=0x22;        //设置 _0 _1引脚为RX TX//串口相关寄存器rULCON0=0x3;rUCON0=0x5;rUMCON0=0;rUFCON0=0;//波特率计算相关/*     //9600rUBRDIV0=433;rUDIVSLOT0=0x2222;*///用66.7MHZ算  //115200//66700000/(115200*16)-1rUBRDIV0=35;// rUBRDIV0余数*16 然后查表rUDIVSLOT0=0x0888;
}
//串口发送一字节
void uart_putc(char c)
{    while(!(rUTRSTAT0&(1<<1)));//等待发送结束rUTXH0=c;
}
char uart_getc()
{while(!(rUTRSTAT0&(1<<0)));//等待发送结束return rURXH0;
}

int printf(const char *fmt, ...)
{int i;int len;va_list args;va_start(args, fmt);len = vsprintf(g_pcOutBuf,fmt,args);va_end(args);for (i = 0; i < strlen(g_pcOutBuf); i++){putc(g_pcOutBuf[i]);}return len;
}int scanf(const char * fmt, ...)
{int i = 0;unsigned char c;va_list args;while(1){c = getc();putc(c);if((c == 0x0d) || (c == 0x0a)){g_pcInBuf[i] = '\0';break;}else{g_pcInBuf[i++] = c;}}va_start(args,fmt);i = vsscanf(g_pcInBuf,fmt,args);va_end(args);return i;
}

CC        = arm-linux-gcc
LD         = arm-linux-ld
OBJCOPY    = arm-linux-objcopy
OBJDUMP    = arm-linux-objdump
AR        = arm-linux-arINCDIR    := $(shell pwd)
# C预处理器的flag，flag就是编译器可选的选项
CPPFLAGS    := -nostdlib -nostdinc -I$(INCDIR)/include
# C编译器的flag
CFLAGS        := -Wall -O2 -fno-builtin#导出这些变量到全局，其实就是给子文件夹下面的Makefile使用
export CC LD OBJCOPY OBJDUMP AR CPPFLAGS CFLAGSobjs := start.o led.o clock.o uart.o main.o
objs += lib/libc.auart.bin: $(objs)$(LD) -Tlink.lds -o uart.elf $^$(OBJCOPY) -O binary uart.elf uart.bin$(OBJDUMP) -D uart.elf > uart_elf.disgcc mkv210_image.c -o mkx210./mkx210 uart.bin 210.binlib/libc.a:cd lib;    make;    cd ..%.o : %.S$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -c%.o : %.c$(CC) $(CPPFLAGS) $(CFLAGS) -o $@ $< -cclean:rm *.o *.elf *.bin *.dis mkx210 -fcd lib; make clean; cd ..