diff options
Diffstat (limited to 'src/packet_interface.c')
| -rw-r--r-- | src/packet_interface.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/src/packet_interface.c b/src/packet_interface.c index 441fff9..98a1ef2 100644 --- a/src/packet_interface.c +++ b/src/packet_interface.c @@ -66,17 +66,27 @@ void usart2_isr(void) { } ssize_t rv = cobs_decode_incremental(&host_cobs_state, (char *)host_packet_buf, sizeof(host_packet_buf), data); - if (rv == -2) { - LOG_PRINTF("Host interface COBS packet too large\n"); + if (rv == 0) { + /* good, empty frame */ + LOG_PRINTF("Got empty frame from host\n"); + host_packet_length = -1; + } else if (rv == -1) { + /* Decoding frame, wait for next byte */ + } else if (rv == -2) { + LOG_PRINTF("Host interface COBS framing error\n"); host_packet_length = -1; } else if (rv == -3) { + /* invalid empty frame */ LOG_PRINTF("Got double null byte from host\n"); - } else if (rv < 0) { - LOG_PRINTF("Host interface COBS framing error\n"); + host_packet_length = -1; + } else if (rv == -4) { + /* frame too large */ + LOG_PRINTF("Got too large frame from host\n"); host_packet_length = -1; } else if (rv > 0) { + /* Good, non-empty frame */ host_packet_length = rv; - } /* else just return and wait for next byte */ + } TRACING_CLEAR(TR_HOST_IF_USART_IRQ); } |