【ARM】2410裸机系列－uart串口通信

开发环境

   &＃xff08;1&＃xff09;硬件平台&＃xff1a;FS2410

   &＃xff08;2&＃xff09;主机&＃xff1a;Ubuntu 12.04

FS2410串口的原理图

串口UART寄存器配置

配置TXD0与RXD0(GPH2、GPH3)

设置波特率&＃xff08;UBRDIVn&＃xff09;

设置传输格式(ULCONn)

选择时钟源与中断方式&＃xff08;UCONn&＃xff09;

设置FIFO&＃xff08;UFCONn&＃xff09;

设置流控&＃xff08;UMCONn&＃xff09;

接收字符和发送字符&＃xff08;UTRSTATn&＃xff09;

源代码

 //uart.c

#include "2410addr.h"void putc(char ch) //发送字符
{while(!(rUTRSTAT0 & 0x2) ); //判断发送缓冲区是否为空 rUTXH0 &＃61; ch; //发送字符}char getc(void) //接收字符
{while(!(rUTRSTAT0 & 0x1)); //判断接收缓冲区是否为空return rURXH0; //返回接收的字符
}void putstr(char *str) //发送字符串
{while(*str !&＃61; &＃39;\0&＃39;){if(*str &＃61;&＃61; &＃39;\n&＃39;){putc(&＃39;\n&＃39;);putc(&＃39;\r&＃39;);}elseputc(*str);str&＃43;&＃43;;}
}int main(void)
{char ch;char str[100];int i &＃61; 0, j;for(j &＃61; 0; j <100; j&＃43;&＃43;) //清空字符串str[j] &＃61; &＃39;\0&＃39;;rGPHCON &＃61; rGPHCON & ~(0xf <<4) | (0xa <<4); //配置RXD0、TXD0rGPHUP &＃61; 0x0c; //设置上拉电阻rUFCON0 &＃61; 0; //不用FIFOrUMCON0 &＃61; 0; //不用流控rULCON0 &＃61; 0x3; //8位数据&＃xff0c;1个停止位&＃xff0c;无校验&＃xff0c;正常模式rUCON0 &＃61; 0x5; //时钟源位PCLK&＃xff0c; 中断方式为查询rUBRDIV0 &＃61; ((int)(50000000 / 115200 / 16) - 1); //设置波特率为115200putc(&＃39;\r&＃39;);putstr("hello mystery \n");while(1){ch &＃61; getc(); //接收字符putc(ch); //发送字符str[i&＃43;&＃43;] &＃61; ch;if(ch &＃61;&＃61; &＃39;\r&＃39;){i &＃61; 0;putc(&＃39;\n&＃39;);putstr("mystery:");putstr(str);putstr("\n");for(j &＃61; 0; j <100; j&＃43;&＃43;) //清空字符串str[j] &＃61; &＃39;\0&＃39;;}}return 0;
}

//start.S

.text
.global _start
_start:
#define WATCHDOG 0x53000000ldr r0, &＃61;WATCHDOGmov r1, #0str r1, [r0]ldr sp, &＃61;1024*4bl mainloop:b loop

//Makefile

uart.bin: start.S uart.carm-linux-gcc -c start.S -o start.oarm-linux-gcc -c uart.c -o uart.oarm-linux-ld -Ttext 0x30008000 start.o uart.o -o uartarm-linux-objcopy -O binary -S uart uart.binclean:rm -f *.o uart.binxyyc

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