xilinx zynq7020通过ps uart实现简单计算器

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/*
 * helloworld.c: simple test application
 *
 * This application configures UART 16550 to baud rate 9600.
 * PS7 UART (Zynq) is not initialized by this application, since
 * bootrom/bsp configures it to baud rate 115200
 *
 * ------------------------------------------------
 * | UART TYPE   BAUD RATE                        |
 * ------------------------------------------------
 *   uartns550   9600
 *   uartlite    Configurable only in HW design
 *   ps7_uart    115200 (configured by bootrom/bsp)
 */

#include <stdio.h>
#include "platform.h"
#include "xil_printf.h"
#include "math.h"

double calculator();

int main()
{
    init_platform();

    print("Hello World\n\r");
    calculator();
    cleanup_platform();
    return 0;
}


double calculator()
{
    // 分别存放第一个操作数和第二个操作数以及结果的变量
    double x1,x2,result;

    // 存放运算符的变量
    char m;

    while(1)
    {
        printf("请输入第一个数：\n");
        // 下面这得注意，接收double型的数据得用lf%，接收float用f%
        scanf("%lf",&x1);

        printf("请输入运算操作（+ - * /）：\n");
        m = getchar();
        printf("\n");

        printf("请输入第二个数：\n");
        scanf("%lf",&x2);

        switch(m)
        {
            case '+':
                printf("加法\n");
                result = x1 + x2;
                printf("%lf + %lf = %lf\n",x1,x2,result);
                break;

            case '-':
                printf("减法\n");
                result = x1 - x2;
                printf("%lf - %lf = %lf\n",x1,x2,result);
                break;

            case '*':
                printf("乘法\n");
                result = x1 * x2;
                printf("%lf * %lf = %lf\n",x1,x2,result);
                break;

            case '/':
                printf("除法\n");
                if(x2 == 0)
                {
                    printf("除数不能为0.\n");
                }
                else
                {
                    result = x1 / x2;
                    printf("%lf / %lf = %lf\n",x1,x2,result);
                }
                break;

            default:
                break;
        }
    }

    return 0.0;
}