[经验]

【复旦微电子FM33LG0xx开发板免费试用】两种方式实现标准输入输出

jf_1137202360

2022-12-13 12:40:07

926 复旦微电子

前言

前面一篇我们实现了串口驱动,提供了串口读写的接口，为了方便调试,我们需要实现标准输入输出。我们可以使用MDK的MicroLIB实现,也可以直接使用源码,比如xprintf。

使用MicroLIB

工程配置中勾选Use MicroLIB

Help->uVision HELP搜索stdio可以找到标准输入输出的底层接口

我们实现接口fgetc和fputc即可。

添加target.c

#include

#include "uart.h"

int fgetc(FILE *f)

{

/* Your implementation of fgetc(). */

int len=0;

uint8_t ch=0;

do

{

len = uart_read(&ch, 1);

}while(len == 0);

return ch;

}

int fputc(int c, FILE *stream)

{

/* Your implementation of fputc(). */

uint8_t ch=0;

if((uint8_t)ch == (uint8_t)'n')

{

ch = 'r';

uart_write(&ch,1);

}

ch = (uint8_t)c;

uart_write(&ch,1);

return c;

}

main.c中测试

int a;

int b;

printf("Hello Worldrn");

while(1)

{

printf("please input a and b:");

scanf("%d %d",&a,&b);

printf("%d+%d=%drn",a,b,a+b);

//int len=0;

//if((len = uart_read(buffer, sizeof(buffer))) >0)

//{

// uart_write(buffer, len);

//}

}

使用xprintf

http://elm-chan.org/fsw/strf/xprintf.html

下载xprintf.c/h添加到工程中

Main.c中实现收发接口

#include "xprintf.h"

{

uint8_t c=ch;

uart_write(&c,1);

}

int xprintf_in(void)

{

int len=0;

uint8_t ch=0;

do

{

len = uart_read(&ch, 1);

}while(len == 0);

return ch;

}

初始化设置接口

xdev_out(xprintf_out);

xdev_in(xprintf_in);

Xprintf.h中配置

#define XF_USE_OUTPUT 1 /* 1: Enable output functions */

#define XF_CRLF 1 /* 1: Convert n ==> rn in the output char */

#define XF_USE_DUMP 1 /* 1: Enable put_dump function */

#define XF_USE_LLI 1 /* 1: Enable long long integer in size prefix ll */

#define XF_USE_FP 1 /* 1: Enable support for floating point in type e and f */

#define XF_DPC '.' /* Decimal separator for floating point */

#define XF_USE_INPUT 1 /* 1: Enable input functions */

#define XF_INPUT_ECHO 1 /* 1: Echo back input chars in xgets function */

测试

  xprintf("%dn", 1234);          /* "1234" */

xprintf("%6d,%3d%%n", -200, 5); /* "  -200,  5%" */

xprintf("%-6un", 100);          /* "100 " */

xprintf("%ldn", 12345678);       /* "12345678" */

xprintf("%llun", 0x100000000); /* "4294967296" */

xprintf("%lldn", -1LL);          /* "-1"           */

xprintf("%04xn", 0xA3);          /* "00a3" */

xprintf("%08lXn", 0x123ABC);    /* "00123ABC" */

xprintf("%016bn", 0x550F);       /* "0101010100001111" */

xprintf("%*dn", 6, 100);       /* " 100" */

xprintf("%sn", "abcdefg");       /* "abcdefg" */

xprintf("%5sn", "abc");          /* "  abc" */

xprintf("%-5sn", "abc");       /* "abc  " */

xprintf("%.5sn", "abcdefg");    /* "abcde" */

xprintf("%-5.2sn", "abcdefg"); /* "ab " */

xprintf("%cn", 'a');             /* "a" */

xprintf("%12fn", 10.0);          /* " 10.000000" */

xprintf("%.4En", 123.45678);    /* "1.2346E+02" */

char buffer[64];

long a;

long b;

char* p;

while(1)

{

xprintf("please input a int:n");

xgets(buffer,sizeof(buffer));

p = buffer;

xatoi(&p,&a);

xprintf("please input a int:n");

xgets(buffer,sizeof(buffer));

p = buffer;

xatoi(&p,&b);

xprintf("%d+%d=%dn",a,b,a+b);

}