更新时间:2022-09-20 14:15:03
开发环境
(1)硬件平台:FS2410
(2)主机: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(UBRDIVn)
设置传输格式(ULCONn)
选择时钟源与中断方式(UCONn)
设置FIFO(UFCONn)
设置流控(UMCONn)
接收字符和发送字符(UTRSTATn)
源代码
//uart.c
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|
#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 = 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 != '\0' )
{
if (*str == '\n' )
{
putc ( '\n' );
putc ( '\r' );
}
else
putc (*str);
str++;
}
} int main( void )
{ char ch;
char str[100];
int i = 0, j;
for (j = 0; j < 100; j++) //清空字符串
str[j] = '\0' ;
rGPHCON = rGPHCON & ~(0xf << 4) | (0xa << 4); //配置RXD0、TXD0
rGPHUP = 0x0c; //设置上拉电阻
rUFCON0 = 0; //不用FIFO
rUMCON0 = 0; //不用流控
rULCON0 = 0x3; //8位数据,1个停止位,无校验,正常模式
rUCON0 = 0x5; //时钟源位PCLK, 中断方式为查询
rUBRDIV0 = (( int )(50000000 / 115200 / 16) - 1); //设置波特率为115200
putc ( '\r' );
putstr( "hello mystery \n" );
while (1)
{
ch = getc (); //接收字符
putc (ch); //发送字符
str[i++] = ch;
if (ch == '\r' )
{
i = 0;
putc ( '\n' );
putstr( "mystery:" );
putstr(str);
putstr( "\n" );
for (j = 0; j < 100; j++) //清空字符串
str[j] = '\0' ;
}
}
return 0;
} |
//start.S
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.text .global _start _start: #define WATCHDOG 0x53000000 ldr r0, =WATCHDOG
mov r1, #0
str r1, [r0]
ldr sp, =1024*4
bl main
loop: b loop
|
//Makefile
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uart.bin: start.S uart.c arm-linux-gcc -c start.S -o start.o
arm-linux-gcc -c uart.c -o uart.o
arm-linux-ld -Ttext 0x30008000 start.o uart.o -o uart
arm-linux-objcopy -O binary -S uart uart.bin
clean: rm -f *.o uart.binxyyc
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