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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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26
platforms/nuttx/src/px4/common/SerialImpl.cpp
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@@ -293,12 +293,36 @@ 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;
}
ssize_t space_available = 0;
int ret = ioctl(_serial_fd, FIONSPACE, &space_available);
if (ret < 0) {
return -1;
}
return space_available;
}
ssize_t SerialImpl::read(uint8_t *buffer, size_t buffer_size)

1
platforms/nuttx/src/px4/common/include/SerialImpl.hpp
View File

@@ -60,6 +60,7 @@ public:
bool close();
ssize_t bytesAvailable();
ssize_t txSpaceAvailable();
ssize_t read(uint8_t *buffer, size_t buffer_size);
ssize_t readAtLeast(uint8_t *buffer, size_t buffer_size, size_t character_count = 1, uint32_t timeout_us = 0);