66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
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#include <unistd.h>
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#include "protocol.h"
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#include "8b10b.h"
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void reset_receiver(struct proto_rx_st *st, struct command_if_def *cmd_if) {
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st->rxpos = -1;
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st->address = 5; /* FIXME debug code */
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st->cmd_if = cmd_if;
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}
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void receive_symbol(struct proto_rx_st *st, int symbol) {
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if (symbol == -K28_1) { /* Comma/frame delimiter */
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st->rxpos = 0;
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/* Fall through and return and just ignore incomplete packets */
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} else if (symbol == -DECODING_ERROR) {
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goto reset;
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} else if (symbol < 0) { /* Unknown comma symbol or error */
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goto reset;
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} else if (st->rxpos == -1) {
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return;
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} else if (st->rxpos == 0) { /* First data symbol, and not an error or comma symbol */
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st->packet_type = symbol & ~PKT_TYPE_BULK_FLAG;
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if (st->packet_type >= st->cmd_if->packet_type_max)
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goto reset;
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int payload_len = st->cmd_if->payload_len[st->packet_type];
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st->is_bulk = symbol & PKT_TYPE_BULK_FLAG;
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st->offset = (st->is_bulk) ? (st->address*payload_len + 1) : 2;
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st->rxpos++;
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if (payload_len == 0 && st->is_bulk) {
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handle_command(st->packet_type, NULL);
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goto reset;
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}
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} else if (!st->is_bulk && st->rxpos == 1) {
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if (symbol != st->address)
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goto reset;
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if (st->cmd_if->payload_len[st->packet_type] == 0) {
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handle_command(st->packet_type, NULL);
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goto reset;
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}
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st->rxpos = 2;
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} else {
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if (st->rxpos - st->offset >= 0)
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st->argbuf[st->rxpos - st->offset] = symbol;
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st->rxpos++;
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if (st->rxpos - st->offset == st->cmd_if->payload_len[st->packet_type]) {
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handle_command(st->packet_type, (uint8_t *)st->argbuf);
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goto reset;
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}
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}
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return;
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reset:
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st->rxpos = -1;
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}
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