tabby/avr/send.c

#include <avr/io.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>
#include <util/delay.h>

#include <tabby/printer.h>
#include <tabby/avr/uart.h>
#include <tabby/avr/link.h>
#include <tabby/avr/printer.h>
#include <tabby/avr.h>

int main() {
    uint16_t i            = 0,
             b            = 0,
             sheet_offset = 0;

    uint8_t c;

    tabby_printer_packet header = {
        .size = 0
    };

    tabby_printer_response response = {
        .device = TABBY_PRINTER_DEVICE_ID,
        .status = TABBY_PRINTER_OK
    };

    tabby_printer_job job;

    uint8_t sheet[TABBY_PRINTER_SHEET_SIZE];

    uart_init();

    tabby_avr_link_init_master();

    sei();

    while (1) {
        c = uart_getchar(NULL);

        switch (i) {
            case 0: {
                if (c == TABBY_PRINTER_SYNC_1) {
                    header.data[0] = c;
                    i++;

                    b = 0;
                }

                break;
            }

            case 1: {
                if (c == TABBY_PRINTER_SYNC_2) {
                    header.data[1] = c;
                    i++;
                } else {
                    i = 0;
                }

                break;
            }

            case 2: {
                switch (c) {
                    case TABBY_PRINTER_PACKET_INIT:
                    case TABBY_PRINTER_PACKET_CANCEL: {
                        sheet_offset = 0;
                    }

                    case TABBY_PRINTER_PACKET_JOB:
                    case TABBY_PRINTER_PACKET_DATA:
                    case TABBY_PRINTER_PACKET_INQUIRY: {
                        header.type = c;
                        i++;

                        break;
                    }

                    default: {
                        i = 0;

                        break;
                    }
                }

                break;
            }

            case 3: {
                header.compression = c;
                i++;

                break;
            }

            case 4: {
                header.size = c;
                i++;

                break;
            }

            case 5: {
                header.size |= c << 8;

                if (tabby_avr_printer_packet_toolarge(header.type,
                                                      header.size)) {
                               i = 0;
                               b = 0;
                    sheet_offset = 0;
                } else {
                    i++;
                }

                break;
            }

            default: {
                if (b < header.size) {
                    if (header.type == TABBY_PRINTER_PACKET_JOB) {
                        job.data[b] = c;
                    } else if (header.type == TABBY_PRINTER_PACKET_DATA) {
                        sheet[sheet_offset++] = c;
                    }

                    b++;
                } else if (b == header.size) {
                    b++;
                } else if (b == header.size + 1) {
                    i = 0;
                    b = 0;

                    if (header.type == TABBY_PRINTER_PACKET_JOB) {
                        tabby_avr_printer_send_sheet(sheet,
                                                     sheet_offset,
                                                     &response);

                        tabby_avr_printer_job_start(&job, &response);

                        sheet_offset = 0;
                    } else if (header.type == TABBY_PRINTER_PACKET_INQUIRY) {
                        tabby_avr_printer_send_inquiry(&response);
                    }

                    uart_putchar(response.device, NULL);
                    uart_putchar(response.status, NULL);
                }
            }
        }
    }

    return 0;
}