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);
}