基于mbed使用ps2摇杆模块的代码

以下是一个基于mbed的使用PS2摇杆模块的示例代码，可以供您参考：

#include "mbed.h"

#define PS2_DAT PTE4
#define PS2_CMD PTE5
#define PS2_SEL PTE6
#define PS2_CLK PTE7

DigitalIn ps2dat(PS2_DAT);
DigitalOut ps2cmd(PS2_CMD);
DigitalOut ps2sel(PS2_SEL);
DigitalIn ps2clk(PS2_CLK);

void ps2_write(unsigned char data)
{
    unsigned char parity = 1;
    ps2cmd = 0;
    wait_us(100);
    ps2clk = 0;
    wait_us(100);
    ps2dat = 0;
    wait_us(100);
    ps2clk = 1;
    wait_us(10);
    ps2dat = 1;
    wait_us(10);
    ps2clk = 0;

    for (int i = 0; i < 8; i++) {
        if (data & 1) {
            ps2dat = 1;
        } else {
            ps2dat = 0;
        }
        parity = parity ^ (data & 1);
        wait_us(10);
        ps2clk = 1;
        wait_us(10);
        ps2clk = 0;
        data >>= 1;
    }

    if (parity) {
        ps2dat = 1;
    } else {
        ps2dat = 0;
    }
    wait_us(10);
    ps2clk = 1;
    wait_us(10);
    ps2clk = 0;
    ps2dat = 1;
    wait_us(10);
    ps2cmd = 1;
    wait_us(100);
}

unsigned char ps2_read()
{
    unsigned char data = 0;
    unsigned char parity = 1;
    ps2cmd = 1;
    wait_us(100);
    ps2clk = 1;
    wait_us(10);
    while (ps2clk) {
        wait_us(10);
    }
    for (int i = 0; i < 8; i++) {
        wait_us(10);
        ps2clk = 0;
        wait_us(10);
        data >>= 1;
        if (ps2dat) {
            data |= 0x80;
            parity = parity ^ 1;
        }
        ps2clk = 1;
    }
    wait_us(10);
    ps2clk = 0;
    wait_us(10);
    if (ps2dat != parity) {
        data = 0;
    }
    wait_us(100);
    return data;
}

int main()
{
    int x, y;
    unsigned char data[3];
    while (1) {
        ps2sel = 0;
        ps2cmd = 1;
        ps2clk = 1;
        wait_us(100);
        ps2_write(0x01);
        ps2_read();
        ps2_read();
        ps2_read();
        data[0] = ps2_read();
        data[1] = ps2_read();
        data[2] = ps2_read();
        ps2sel = 1;
        x = data[0] - 128;
        y = data[1] - 128;
        if (x < -30) {
            printf("Left\n");
        }
        if (x > 30) {
            printf("Right\n");
        }
        if (y < -30) {
            printf("Up\n");
        }
        if (y > 30) {
            printf("Down\n");
        }
        wait_ms(100);
    }
}

此代码使用mbed库来读取PS2摇杆模块的位置，并将其打印到终端上。您需要将代码中的引脚定义改为您使用的实际引脚。