General • How sideset works?

Code:

.program led.side_set 1.wrap_target    out x, 32   side 1 // led on, while it waits for pio_sm_put_blocking ?    in  x, 32   side 0 // led off, while it waits for pio_sm_get_blocking ?.wrap

Code:

#include <hardware/pio.h>#include <hardware/timer.h>#include <tusb.h>#include <cstdio>#include "led.pio.h"namespace {#define pio pio0int sm;void setup_led_pio() {    sm = pio_claim_unused_sm(pio, true);    auto offset = pio_add_program(pio, &led_program);    pio_sm_config c = led_program_get_default_config(offset);    sm_config_set_clkdiv(&c, 1);    sm_config_set_sideset_pins(&c, PICO_DEFAULT_LED_PIN);    pio_gpio_init(pio, PICO_DEFAULT_LED_PIN);    pio_sm_set_consecutive_pindirs(pio, sm, PICO_DEFAULT_LED_PIN, 1, true);    // Auto pull/push    sm_config_set_in_shift(&c, true, true, 32);    sm_config_set_out_shift(&c, true, true, 32);    pio_sm_init(pio, sm, offset, &c);    pio_sm_set_enabled(pio, sm, true);    pio_sm_drain_tx_fifo(pio, sm);}} // namespace {void main(){    stdio_init_all();    while (!tud_cdc_connected())        sleep_ms(100);    setup_led_pio();    uint32_t data = 0;    while(true) {        pio_sm_put_blocking(pio, sm, data++);        busy_wait_ms(500);        uint32_t dat = pio_sm_get_blocking(pio, sm);        printf("%lx\n", dat);        busy_wait_ms(500);    }}