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artiq/soc/runtime/gpio.c

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#include <generated/csr.h>
#include "gpio.h"
void gpio_set(int channel, int value)
{
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static int csr_value;
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if(value)
csr_value |= 1 << channel;
else
csr_value &= ~(1 << channel);
leds_out_write(csr_value);
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}