diff options
Diffstat (limited to 'src/modules/mavlink/mavlink_main.cpp')
| -rw-r--r-- | src/modules/mavlink/mavlink_main.cpp | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/src/modules/mavlink/mavlink_main.cpp b/src/modules/mavlink/mavlink_main.cpp index 49781e8f8..8c79a1fee 100644 --- a/src/modules/mavlink/mavlink_main.cpp +++ b/src/modules/mavlink/mavlink_main.cpp @@ -159,9 +159,10 @@ Mavlink::Mavlink() : _rate_tx(0.0f), _rate_txerr(0.0f), _rate_rx(0.0f), - _rstatus {}, - _message_buffer {}, - _message_buffer_mutex {}, + _rstatus{}, + _message_buffer{}, + _message_buffer_mutex{}, + _send_mutex{}, _param_initialized(false), _param_system_id(0), _param_component_id(0), @@ -716,7 +717,7 @@ Mavlink::get_free_tx_buf() * flow control if it continues to be full */ int buf_free = 0; - (void) ioctl(_uart_fd, FIONWRITE, (unsigned long)&buf_free); + (void) ioctl(_uart_fd, FIONWRITE, (unsigned long)&buf_free); if (get_flow_control_enabled() && buf_free < TX_BUFFER_GAP) { /* Disable hardware flow control: @@ -742,6 +743,8 @@ Mavlink::send_message(const uint8_t msgid, const void *msg) return; } + pthread_mutex_lock(_send_mutex); + int buf_free = get_free_tx_buf(); uint8_t payload_len = mavlink_message_lengths[msgid]; @@ -754,7 +757,7 @@ Mavlink::send_message(const uint8_t msgid, const void *msg) /* no enough space in buffer to send */ count_txerr(); count_txerrbytes(packet_len); - return; + goto out; } uint8_t buf[MAVLINK_MAX_PACKET_LEN]; @@ -762,7 +765,8 @@ Mavlink::send_message(const uint8_t msgid, const void *msg) /* header */ buf[0] = MAVLINK_STX; buf[1] = payload_len; - buf[2] = mavlink_get_channel_status(_channel)->current_tx_seq++; // TODO use internal seq counter? + /* use mavlink's internal counter for the TX seq */ + buf[2] = mavlink_get_channel_status(_channel)->current_tx_seq++; buf[3] = mavlink_system.sysid; buf[4] = mavlink_system.compid; buf[5] = msgid; @@ -790,6 +794,9 @@ Mavlink::send_message(const uint8_t msgid, const void *msg) _last_write_success_time = _last_write_try_time; count_txbytes(packet_len); } + +out: + pthread_mutex_unlock(_send_mutex); } void @@ -1298,6 +1305,9 @@ Mavlink::task_main(int argc, char *argv[]) return ERROR; } + /* initialize send mutex */ + pthread_mutex_init(&_send_mutex, NULL); + /* initialize mavlink text message buffering */ mavlink_logbuffer_init(&_logbuffer, 5); |