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#include <stdint.h>
volatile uint32_t *io_in = (volatile uint32_t *)0x00000000;
volatile uint32_t *io_out = (volatile uint32_t *)0x00000004;
int main(void) {
while (1) {
if (*io_in) *io_out = 0b11111;
else *io_out = 0b00000;
}
}
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