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serial: add txSpaceAvailable function (#26069)

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* serial: add txSpaceAvailable function

* serial: txSpaceAvailable and bytesAvailable fixups
This commit is contained in:
Jacob Dahl
2025-12-12 09:31:33 -09:00
committed by GitHub
parent 12745baf6c
commit b92d21bd31
8 changed files with 74 additions and 3 deletions
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platforms/posix/src/px4/common/SerialImpl.cpp
+20 -1
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@@ -281,12 +281,31 @@ ssize_t SerialImpl::bytesAvailable()
{
if (!_open) {
PX4_ERR("Device not open!");
errno = EBADF;
return -1;
}
ssize_t bytes_available = 0;
int ret = ioctl(_serial_fd, FIONREAD, &bytes_available);
return ret >= 0 ? bytes_available : 0;
if (ret < 0) {
return -1;
}
return bytes_available;
}
ssize_t SerialImpl::txSpaceAvailable()
{
if (!_open) {
PX4_ERR("Device not open!");
errno = EBADF;
return -1;
}
// POSIX/Linux doesn't have a direct equivalent to NuttX's FIONSPACE
errno = ENOSYS;
return -1;
}
ssize_t SerialImpl::read(uint8_t *buffer, size_t buffer_size)