102 lines
1.9 KiB
C
102 lines
1.9 KiB
C
#include <avr/io.h>
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#include <avr/interrupt.h>
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#include <avr/sleep.h>
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#include <tabby/avr/printer.h>
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#include <tabby/avr/uart.h>
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#include <tabby/avr/link.h>
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#include <tabby/avr.h>
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static volatile uint16_t offset_header = 0,
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offset_body = 0,
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size_body = 0;
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/*
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* SPI byte receipt interrupt vector
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*/
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ISR(SPI_STC_vect) {
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uint8_t in = SPDR,
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out = 0;
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uart_putchar(in, NULL);
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switch (offset_header) {
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case 0: {
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if (in == TABBY_PRINTER_SYNC_1) {
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offset_header++;
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offset_body = 0;
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}
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break;
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}
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case 1: {
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if (in == TABBY_PRINTER_SYNC_2) {
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offset_header++;
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} else {
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offset_header = 0;
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}
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break;
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}
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case 2:
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case 3: {
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offset_header++;
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break;
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}
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case 4: {
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size_body = in;
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offset_header++;
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break;
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}
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case 5: {
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size_body |= in << 8;
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if (size_body > TABBY_PRINTER_PACKET_MAX_SIZE) {
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offset_header = 0;
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} else {
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offset_header++;
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}
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break;
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}
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default: {
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if (offset_body <= size_body) {
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offset_body++;
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} else if (offset_body == size_body + 1) {
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offset_body++;
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out = TABBY_PRINTER_DEVICE_ID;
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} else if (offset_body == size_body + 2) {
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offset_body++;
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out = TABBY_PRINTER_OK;
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} else if (offset_body == size_body + 3) {
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offset_header = 0;
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}
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}
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}
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SPDR = out;
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}
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int main() {
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uart_init();
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tabby_avr_link_init_slave();
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sei();
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while (1) {
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sleep_mode();
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}
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return 0;
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}
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