FriendlyARM UART裸机程序源码

最新推荐文章于 2021-11-21 00:01:31 发布

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最新推荐文章于 2021-11-21 00:01:31 发布

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本文链接：https://blog.youkuaiyun.com/xy598646744/article/details/9111497

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本文深入探讨了使用openjtag工具进行单片机开发的过程，特别是通过UART实现的数据通信。作者详细介绍了如何配置单片机的UART模块，包括设置波特率、数据长度、奇偶校验等关键参数，并提供了完整的代码示例，演示了如何发送和接收数据，以及如何在串口打印信息。此外，文章还涉及了LED控制、延时函数和字符串处理等功能，为初学者提供了一套全面的入门指南。

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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);
}