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hello.c
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hello.c
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/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "pico/stdlib.h"
#include "hardware/pio.h"
// Our assembled program:
#include "hello.pio.h"
int main() {
#ifndef PICO_DEFAULT_LED_PIN
#warning pio/hello_pio example requires a board with a regular LED
#else
// Choose which PIO instance to use (there are two instances)
PIO pio = pio0;
// Our assembled program needs to be loaded into this PIO's instruction
// memory. This SDK function will find a location (offset) in the
// instruction memory where there is enough space for our program. We need
// to remember this location!
uint offset = pio_add_program(pio, &hello_program);
// Find a free state machine on our chosen PIO (erroring if there are
// none). Configure it to run our program, and start it, using the
// helper function we included in our .pio file.
uint sm = pio_claim_unused_sm(pio, true);
hello_program_init(pio, sm, offset, PICO_DEFAULT_LED_PIN);
// The state machine is now running. Any value we push to its TX FIFO will
// appear on the LED pin.
while (true) {
// Blink
pio_sm_put_blocking(pio, sm, 1);
sleep_ms(500);
// Blonk
pio_sm_put_blocking(pio, sm, 0);
sleep_ms(500);
}
#endif
}