43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/**
|
|
* 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
|
|
}
|