FriendlyARM UART裸机程序源码

下面是我刚写的，作为新手的我真的不容易啊，（英语不好更是伤不起），代码已测试OK，用的openjtag

/*
 *  copyright - (c) 2012/2/17 xueyang
 *  <blunsmith@gmail.com>
 *  <xueyang1122@gmail.com>
 */

#define rULCON1     (*(volatile unsigned *)(0x7F005400))
#define rUCON1         (*(volatile unsigned *)(0x7F005404))
#define rUFCON1     (*(volatile unsigned *)(0x7F005408))
#define rUMCON1     (*(volatile unsigned *)(0x7F00540C))
#define rUTRSTAT1     (*(volatile unsigned *)(0x7F005410))
#define rUERSTAT1     (*(volatile unsigned *)(0x7F005414))
#define rUFSTAT1     (*(volatile unsigned *)(0x7F005418))
#define rUMSTAT1    (*(volatile unsigned *)(0x7F00541C))
#define rUTXH1         (*(volatile unsigned *)(0x7F005420))
#define rURXH1        (*(volatile unsigned *)(0x7F005424))
#define rUBRDIV1     (*(volatile unsigned *)(0x7F005428))
#define rUDIVSLOT1     (*(volatile unsigned *)(0x7F00542C))
#define rUINTP1     (*(volatile unsigned *)(0x7F005430))
#define rUINTSP1     (*(volatile unsigned *)(0x7F005434))
#define rUINTM1     (*(volatile unsigned *)(0x7F005438))
#define rGPACON0     (*(volatile unsigned *)(0x7F008000))
#define rGPAPUD        (*(volatile unsigned *)(0x7F008008))

#define rGPKPUD         (*(volatile unsigned *)(0x7F00880C))
#define rGPKDAT         (*(volatile unsigned *)(0x7F008808))
#define rGPKCON1        (*(volatile unsigned *)(0x7F008804))
#define rGPKCON0        (*(volatile unsigned *)(0x7F008800))

#define rCLKDIVN      (*(volatile unsigned *)0X7E00F020)
#define rMPLLCON      (*(volatile unsigned *)0x7E00F010)


static void init_uart0(void);
static void Tx(char word);
static char Rx();
static void delay(unsigned int z);
static void put_word(char *s);
static void get_word(char *s);
static int led();

int main(void)
{
    
    init_uart0();
    while(1){
        led();
        put_word("helloword\n\r");
    }
    return 0;
}
static void init_uart0(void)
{
//    rGPAPUD = 0xAAAA;
    rGPACON0 = (rGPACON0 & ~(0xFFFFU<<16)|(0x22222222U)); //set GPACON to UART1
    rULCON1 = (rULCON1 & ~(0xFFFFU)|(0x0003U));    //set word length 8 bit
    rUCON1 = (rUCON1 & ~(0xFU)|(0x5U));    //set transmit/receive mode DMA request
    rUFCON1 = (rUFCON1 & ~(0xFFU)|(0x0U));    //set Tx/Rx FIFO Trigger Level 16 bit
    rUBRDIV1 = (rUBRDIV1 & ~(0xFFFFU)|(0x21U));    //set baud rate
//    rUDIVSLOT1 = (rUDIVSLOT1 & ~(0xFFFFU)|(0xDDD5U));    //select the slot where clock generator divide clock source
}

static void Tx(char word) {
    while(!(rUTRSTAT1 & (0x2U)));
    rUTXH1 = word;
}

static char Rx() {
    char word;
    if((rUTRSTAT1 & 0x1)==0x1) {
            word = rURXH1;
    }
    return word;
}
static void delay(unsigned int z) {
    unsigned int x,y;
    for(x=z;x>0;x--)
        for(y=1000;y>0;y--);
}

static void put_word(char *s) {
    while(*s){
        Tx(*s);
        s++;
    }
}
static void get_word(char *s) {
    unsigned char words;
    while(1) {    
        words=Rx();
        if(words == '\r'||words == '\n'){
            *s = 0;
            break;
        }
        *s = words;
        *s++;
    }
}
static int led()
{
    rGPKCON0 = (rGPKCON0 & ~(0xffffU<<16))|(0x1111U<<16);
    rGPKPUD  = (rGPKPUD  & ~(0xffU << 8))|(0x00U<<8);
        int data = 0x09;
        rGPKDAT = (rGPKDAT & ~(0xf<<4)) | ((data & 0xf)<<4);
        delay(2000);
        data = 0x06;
        rGPKDAT = (rGPKDAT & ~(0xf<<4)) | ((data & 0xf)<<4);
        delay(2000);
}