qmk/keyboards/sofle_choc/keymaps/custom/star_key.c


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#include QMK_KEYBOARD_H
#include "transactions.h"
#include "star_key.h"

typedef struct _master_to_slave_t {
    int is_star;
} master_to_slave_t;


bool is_star = 0;
static bool is_synced = 1;

// Handler for the slave, receive the star information
void user_sync_a_slave_handler(uint8_t in_buflen, const void* in_data, uint8_t out_buflen, void* out_data) {
    const master_to_slave_t *m2s = (const master_to_slave_t*)in_data;
    is_star = m2s->is_star;
}

void star_key_init(void) {
    if (!is_keyboard_master()) {
        transaction_register_rpc(SET_STAR_KEY, user_sync_a_slave_handler);
    }
}

void set_star_key(bool status) {
    is_star = status;
    is_synced = 0;
}

void sync_star_key(void) {
    if (!is_synced) {
        // Send the state to the other side of the keyboard
        master_to_slave_t m2s = { is_star };
        transaction_rpc_send(SET_STAR_KEY, sizeof(m2s), &m2s);
        is_synced = 1;
    }
}