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22 Commits

Author SHA1 Message Date
Andrew Tridgell 2340bb6220 PX4: use a minimum transmit buffer for UARTs of 512 bytes 
this avoids writes stalling on the GPS port. We can't afford this
memory on APM2, but we can on PX4, and it means that while the GPS is
blocking at startup it doesn't cause any scheduler slips
 2013-08-30 13:01:33 +10:00
Andrew Tridgell 0916388ab5 HAL_PX4: retry opening UARTs up to 5 times 
this seems to help a lot with the USB port on PX4
 2013-07-11 13:50:23 +10:00
Andrew Tridgell 8766e86091 HAL_PX4: fixed blocking bulk writes to UARTs 
this fixes a problem with uBlox initialisation on PX4
 2013-03-20 15:41:52 +11:00
Andrew Tridgell 14911eff6c HAL_PX4: added a (disabled) trick for handling blocking ttyACM0 
this doesn't work yet, but is worth having for debugging
 2013-03-20 11:20:43 +11:00
Andrew Tridgell c373429a6e HAL_PX4: fixed a buffer handling bug 
BUF_SPACE() was badly buggy, which could lead to memory corruption
 2013-02-20 18:15:56 +11:00
Andrew Tridgell 54e7bce75e HAL_PX4: cope with O_NONBLOCK not working in NuttX on ttyACM0 
writes will block anyway, which clags up APM
 2013-02-19 12:02:46 +11:00
Andrew Tridgell fc8065b50f HAL_PX4: added UART performance counters 2013-01-24 15:04:57 +11:00
Andrew Tridgell f72b532405 HAL_PX4: ensure all writes go via buffers 
this prevents output corruption by direct fd writes
 2013-01-23 09:22:51 +11:00
Andrew Tridgell 89cb3fbd61 HAL_PX4: fixed blocking IO in UART driver 2013-01-22 21:52:21 +11:00
Andrew Tridgell 6ffa18fa61 HAL_PX4: rewrite UART driver to be much more efficient 
this does the IO in the timer thread, and uses buffers in the main
task to avoid system call costs in the flight code.

The cost of PX4 read and write system calls is quite high - about 10
to 15 usec. We can't afford to pay that per byte
 2013-01-22 21:22:01 +11:00
Andrew Tridgell 546ed19ffc HAL_PX4: improved efficiency of serial writes 
use buffer at a time writes when possible, and use O_NONBLOCKING to
avoid txspace()
 2013-01-22 10:50:26 +11:00
Andrew Tridgell 18cfd29f2f HAL_PX4: added a read buffer to the UART driver 
this lowers the average cost of reading bytes by a large amount, and
prevents the GPS driver from chewing lots of time.
 2013-01-22 10:34:04 +11:00
Andrew Tridgell 76092eb590 AP_HAL: remove unused peek() interface from UART drivers 
this is a bit tricky to implement on some platforms, and is unused
anyway
 2013-01-16 14:43:18 +11:00
Andrew Tridgell 64a8a8e4c9 HAL_PX4: fixed using mavlink on the console 
this disables the ONLCR termios flag, which was injecting extra
carriage returns in the output
 2013-01-14 16:21:27 +11:00
Andrew Tridgell 30447018d5 HAL_PX4: handle %S in format strings 2013-01-05 08:10:07 +11:00
Andrew Tridgell 08d518e07f HAL_PX4: switch to libc vdprintf() 
vdprintf has now been added to NuttX
 2013-01-05 08:01:10 +11:00
Andrew Tridgell 44837a11f2 HAL_PX4: added baudrate support to UART driver 2013-01-04 19:42:30 +11:00
Andrew Tridgell 155fca8a4b HAL_PX4: make APM sketches into daemons 
this also moves uartA onto UART5, allowing ttyS0 for nsh
 2013-01-04 11:14:35 +11:00
Andrew Tridgell d492b72a2c HAL_PX4: use /dev/ttyS0 for uartA 
this also changes txspace and available to use FIONWRITE and FIONREAD
 2013-01-03 21:12:10 +11:00
Andrew Tridgell c6c336a6e8 HAL_PX4: implement peek() and available() 
keep a 1 byte buffer
 2013-01-03 17:27:53 +11:00
Andrew Tridgell d9d5eb52bf HAL_PX4: use fd IO instead of stdio 
this allows for hal console output from within timers, which is very
handy for debugging
 2013-01-03 13:16:41 +11:00
Andrew Tridgell 9373a4e5b3 HAL_PX4: added a uartA driver 
uses stdin/stdout for IO
 2013-01-03 11:03:05 +11:00