avr/radio-rx/main.c

#include <avr/io.h>
#include <dio.h>
#include <display.h>
#include <rfm.h>
#include <spi.h>
#include <stdio.h>
#include <util/delay.h>

void status(display_t *display, rfm_t *radio, int clock) {
    op_mode_t mode = rfm_mode(radio);
    interrupt_flags_t flags = rfm_interrupts(radio);
    // uint8_t rssi = rfm_rssi(radio);

    display_clear(display);

    char clock_str[16];
    sprintf(clock_str, "%4d ", clock);
    display_write_message(display, clock_str);

    if (mode.listen_on) display_write_message(display, "Listen ");
    if (mode.mode == sleep) display_write_message(display, "Sleep");
    if (mode.mode == standby) display_write_message(display, "Standby");
    if (mode.mode == fs) display_write_message(display, "FS");
    if (mode.mode == tx) display_write_message(display, "TX");
    if (mode.mode == rx) display_write_message(display, "RX");

    display_set_location(display, 1, 0);

    /*
    char msg[16];
    snprintf(msg, 15, "[-%d] ", rssi / 2);
    display_write_message(display, msg);
    */

    if (flags.mode_ready)       display_write_message(display, "R ");
    if (flags.rx_ready)         display_write_message(display, "RX ");
    if (flags.tx_ready)         display_write_message(display, "TX ");
    if (flags.timeout)          display_write_message(display, "TO ");
    if (flags.auto_mode)        display_write_message(display, "AM ");
    if (flags.sync_addr_match)  display_write_message(display, "SM ");
    if (flags.fifo_full)        display_write_message(display, "F ");
    if (flags.fifo_not_empty)   display_write_message(display, "NE ");
    if (flags.fifo_level)       display_write_message(display, "LE ");
    if (flags.fifo_overrun)     display_write_message(display, "OR ");
    if (flags.packet_sent)      display_write_message(display, "PS ");
    if (flags.payload_ready)    display_write_message(display, "PR");
    if (flags.crc_ok)           display_write_message(display, "CRC");
}

int main(void) {
    display_t display = {
        .reg = {
            .output         = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 7 },
            .shift_clock    = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 6 },
            .latch_clock    = { .ddr = &DDRF, .port = &PORTF, .pin = &PINF, .addr = 5 },
        },
    };

    rfm_t radio = (rfm_t){
        .spi    = {
            .clock          = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 1 },
            .data_out       = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 2 },
            .data_in        = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 3 },
            .chip_select    = { .ddr = &DDRB, .port = &PORTB, .pin = &PINB, .addr = 4 },
        },
        .irq    = { .ddr = &DDRE, .port = &PORTE, .pin = &PINE, .addr = 6 },
        .reset  = { .ddr = &DDRD, .port = &PORTD, .pin = &PIND, .addr = 4 },
    };

    _delay_ms(15);
    display_init(&display);
    display_clear(&display);
    display_write_message(&display, "waking up");

    rfm_error_e error;

    rfm_init(&radio, (uint8_t [4]){ 0xde, 0xca, 0xfb, 0xad }, 4, &error);
    rfm_listen(&radio);

    /*
    if (!error) {
        display_write_message(&display, "error detected");
        return 0;
    }
    */

    /*
    uint8_t word[8];
    uint8_t sync_length = sync_word(&radio, word);
    char msg[16];
    snprintf(msg, 15, "sync: %d", sync_length);
    display_write_message(&display, msg);
    display_set_location(&display, 1, 0);

    if (sync_length == 4) {
        snprintf(msg, 15, ": %x %x %x %x", word[0], word[1], word[2], word[3]);
    } else {
        snprintf(msg, 15, "word err");
    }

    display_write_message(&display, msg);
    _delay_ms(5000);
    */

    /*
    char msg[16];
    uint32_t frequency = rfm_frequency(&radio);
    snprintf(msg, 15, "F: %ld", frequency);
    display_write_message(&display, msg);
    _delay_ms(5000);
    */

    int clock = 0;
    while(1) {
        // char msg[16];
        // uint8_t packet[66];
        // uint8_t length;
        // display_clear(&display);

        // if (length > 0) {
        //     snprintf(msg, 15, "%d ", packet[0]);
        //     display_write_message(&display, msg);
        //     _delay_ms(1000);
        // }
        interrupt_flags_t flags = rfm_interrupts(&radio);
        if (flags.fifo_not_empty) {
            uint8_t packet[66];
            uint8_t length;

            rfm_receive(&radio, packet, &length);

            char msg[16];
            snprintf(msg, 15, "[%d]: %d", length, packet[0]);

            char msg_2[16];
            snprintf(msg_2, 15, "RSSI: %d", rfm_rssi(&radio));

            display_clear(&display);
            display_write_message(&display, msg);
            display_set_location(&display, 1, 0);
            display_write_message(&display, msg_2);
            _delay_ms(1000);
        }

        status(&display, &radio, clock);
        _delay_ms(1000);
        clock++;
    }
}