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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) {
*io_out = 0;
while (1) {
for (int i = 0; i < 32; ++i) {
*io_out = i;
}
}
}
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