# Lab 2-2 : Print Square
Reference [謝宜紘Print Square](https://hackmd.io/@hsieh22/CA_lab1#Environment-setting)
###### tags: `CA2020`
## Rewrite Print Square C code

# include <stdio.h>

void _start()
{
    int i, j;
    char out;
    volatile char* tx = (volatile char*) 0x40002000;
    for (i = 0; i < 5; i++){
        for (j = 0; j < 5; j++){
           out = 'x';
           *tx = out;
        }
        out = '\n';
        *tx = out;
    }
}
~