/**
 * Copyright (c) 2021 mjcross
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

#include <stdio.h>
#include "pico/stdlib.h"

#include "nec_transmit.h"                           // include the library headers
#include "nec_receive.h"

// Infrared loopback example ('NEC' format)
//
// Need to connect an IR LED to GPIO 14 via a suitable series resistor (e.g. 1.5k)
// and an active-low IR detector to GPIO 15 (e.g. VS1838b)
//
// Output is sent to stdout

int main() {
    stdio_init_all();

    PIO pio = pio0;                                 // choose which PIO block to use (RP2040 has two: pio0 and pio1)
    uint tx_gpio = 14;                              // choose which GPIO pin is connected to the IR LED
    uint rx_gpio = 15;                              // choose which GPIO pin is connected to the IR detector

    // configure and enable the state machines
    //
    int tx_sm = nec_tx_init (pio, tx_gpio);         // uses two state machines, 16 instructions and one IRQ
    int rx_sm = nec_rx_init (pio, rx_gpio);         // uses one state machine and 9 instructions

    if (tx_sm == -1 || rx_sm == -1) {
        printf ("could not configure PIO\n");
        return -1;
    }

    // transmit and receive frames
    //
    uint8_t tx_address = 0x00, tx_data = 0x00, rx_address, rx_data;
    while (true) {

        // create a 32-bit frame and add it to the transmit FIFO
        //
        uint32_t tx_frame = nec_encode_frame (tx_address, tx_data);
        pio_sm_put (pio, tx_sm, tx_frame);
        printf ("\nsent: %02x, %02x", tx_address, tx_data);

        // allow time for the frame to be transmitted (optional)
        //
        sleep_ms (100);

        // display any frames in the receive FIFO
        //
        while (!pio_sm_is_rx_fifo_empty (pio, rx_sm)) {
            uint32_t rx_frame = pio_sm_get (pio, rx_sm);

            if (nec_decode_frame (rx_frame, &rx_address, &rx_data)) {
                printf ("\treceived: %02x, %02x", rx_address, rx_data);
            } else {
                printf ("\treceived: %08x", rx_frame);
            }
        }

        sleep_ms (900);
        tx_data += 1;
    }
}