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MAVLink: cope with available() returning -1

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This commit is contained in:
Andrew Tridgell 2013-01-09 09:47:27 +11:00
parent a237b6cc7b
commit dc66708856
1 changed files with 5 additions and 2 deletions
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7
libraries/GCS_MAVLink/GCS_MAVLink.h
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@ -88,7 +88,7 @@ static inline uint8_t comm_receive_ch(mavlink_channel_t chan)
/// @returns Number of bytes available /// @returns Number of bytes available
static inline uint16_t comm_get_available(mavlink_channel_t chan) static inline uint16_t comm_get_available(mavlink_channel_t chan)
{ {
uint16_t bytes = 0; int16_t bytes = 0;
switch(chan) { switch(chan) {
case MAVLINK_COMM_0: case MAVLINK_COMM_0:
bytes = mavlink_comm_0_port->available(); bytes = mavlink_comm_0_port->available();
@ -99,7 +99,10 @@ static inline uint16_t comm_get_available(mavlink_channel_t chan)
default: default:
break; break;
} }
return bytes; if (bytes == -1) {
return 0;
}
return (uint16_t)bytes;
} }