擦，插楼可耻

上图：

mbed 库的层次结构

用mbed API实现的blink

#include "mbed.h"
DigitalOut myled(LED1);

int main() {
    while(1) {
        myled = 1; // LED is ON
        wait(1); // 1 sec
        myled = 0; // LED is OFF
        wait(1); // 1 sec
    }
}

擦，一晚上乱七八糟的事

明天继续更新

mbed的文章中是以LPC17xx的blink为例进行的说明

从LPC17xx datasheet中查询到对应的GPIO的寄存器地址

然后对对应寄存器进行set或者clear操作，从而实现点灯灭灯

#include "mbed.h"
 
// Reuse initialization code from the mbed library
DigitalOut led1(LED1); // P1_18
 
int main() {
    unsigned int mask_pin18 = 1 << 18;
    
    volatile unsigned int *port1_set = (unsigned int *)0x2009C038;
    volatile unsigned int *port1_clr = (unsigned int *)0x2009C03C;
    
    while (true) {
        *port1_set |= mask_pin18;
        wait(0.5);
        
        *port1_clr |= mask_pin18;
        wait(0.5);
    }
}