diff options
Diffstat (limited to 'src/modules/mavlink/mavlink_main.cpp')
| -rw-r--r-- | src/modules/mavlink/mavlink_main.cpp | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/src/modules/mavlink/mavlink_main.cpp b/src/modules/mavlink/mavlink_main.cpp index ed3b265f9..9a6e1130e 100644 --- a/src/modules/mavlink/mavlink_main.cpp +++ b/src/modules/mavlink/mavlink_main.cpp @@ -158,13 +158,17 @@ mavlink_send_uart_bytes(mavlink_channel_t channel, const uint8_t *ch, int length */ int buf_free = 0; - if (ioctl(uart, FIONWRITE, (unsigned long)&buf_free) == 0 && - hrt_elapsed_time(&last_write_times[(unsigned)channel]) > 500*1000UL) { - struct termios uart_config; - (void)tcgetattr(uart, &uart_config); - uart_config.c_cflag &= ~CRTSCTS; - (void)tcsetattr(uart, TCSANOW, &uart_config); - warnx("DISABLING HARDWARE FLOW CONTROL"); + if (ioctl(uart, FIONWRITE, (unsigned long)&buf_free) == 0) { + + if (buf_free == 0 && last_write_times[(unsigned)channel] != 0 && + hrt_elapsed_time(&last_write_times[(unsigned)channel]) > 500*1000UL) { + + struct termios uart_config; + (void)tcgetattr(uart, &uart_config); + uart_config.c_cflag &= ~CRTSCTS; + (void)tcsetattr(uart, TCSANOW, &uart_config); + warnx("DISABLING HARDWARE FLOW CONTROL"); + } } ssize_t ret = write(uart, ch, desired); |